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Zhang Y, Li Y, Lai C, Wang X, Luo F, Niu Y, Qin Y, Zhang Y, Zhang H. Interocular asymmetry of retinal change in Parkinson's disease. Parkinsonism Relat Disord 2024; 125:107037. [PMID: 38878445 DOI: 10.1016/j.parkreldis.2024.107037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Revised: 06/08/2024] [Accepted: 06/10/2024] [Indexed: 07/29/2024]
Abstract
PURPOSE To investigate interocular asymmetry (IA) of retinal structure and vessel density in patients with Parkinson's disease (PD) and normal controls (NC). METHODS Seventy-eight subjects including 40 PD patients and 38 NC had completed optical coherence tomography angiography (OCTA) and neurological examinations for three rating scales (UPDRS-III, MMSE and MoCA). The IA was calculated by the absolute value of difference in right and left eyes. The IA of thickness in macular ganglion cell inner-plexiform layer (GCIPL), peripapillary retinal nerve fiber layer (pRNFL), and vessel density of superficial capillary plexus (SCP), deep capillary plexus (DCP), radial peripapillary capillary (RPC) were obtained from OCTA. RESULTS The motor-symptom-onset side of eyes showed lower vessel density in parafovea of SCP (51.09 ± 3.46 vs 49.81 ± 4.16, P = 0.03) and superior hemi of perifovea DCP (49.55 ± 5.81 vs 47.33 ± 5.71, = 0.04). The PD patients showed larger IA in thickness of superior half of pRNFL (5.27 [2.67, 10.87] vs 3.08 [1.62, 5.61], P = 0.02) and parafovea GCIPL (2.40[1.25, 6.35] vs 1.40[0.50, 2.45], P = 0.02). No significant interocular asymmetry was found in vessel density between PD and NC. A higher UPDRS-III scale was associated with larger IA in GCIPL (β = 0.093, P = 0.001) and smaller IA in DCP (β = -0.065, P = 0.037). CONCLUSION The motor-symptom-onset side of eyes showed more severe loss of macular vessel density than the other side of eyes. The PD patients showed asymmetrical structural change in GCIPL and pRNFL, which showed the potential as the diagnostic biomarker for PD.
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Affiliation(s)
- Yuqiao Zhang
- Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Yan Li
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China
| | - Chunxin Lai
- Department of Ophthalmology, Guangdong Eye Institute, Guangdong Provincial People's Hospital. Guangzhou, China; Shantou University Medical College, Shantou, China
| | - Xinhao Wang
- Department of Neurology, Maoming People's Hospital, Maoming, China
| | - Fulong Luo
- Department of Ophthalmology, Guangdong Eye Institute, Guangdong Provincial People's Hospital. Guangzhou, China; The Second School of Clinical Medicine, Southern Medical University, Guangzhou, China
| | - Yongyi Niu
- Department of Ophthalmology, Guangdong Eye Institute, Guangdong Provincial People's Hospital. Guangzhou, China
| | - Yongjie Qin
- Department of Ophthalmology, Guangdong Eye Institute, Guangdong Provincial People's Hospital. Guangzhou, China
| | - Yuhu Zhang
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, China.
| | - Hongyang Zhang
- Department of Ophthalmology, Nanfang Hospital, Southern Medical University, Guangzhou, China.
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2
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Zhou Y, Yang Y, Qi T, Hou Z, Ge Q, Lu Z. Transcriptome Study of rd1Mouse Brain and Association with Parkinson's Disease. ACS OMEGA 2024; 9:25756-25765. [PMID: 38911794 PMCID: PMC11191077 DOI: 10.1021/acsomega.3c09938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 05/10/2024] [Accepted: 05/24/2024] [Indexed: 06/25/2024]
Abstract
Degeneration of the retina is intrinsically associated with the pathogenesis and progression of neurodegenerative diseases. However, the cellular and molecular mechanisms underlying the association between neurodegeneration and retinal degeneration are still under exploration due to the complexity of the connectivity network of the nervous system. In this study, RNA-seq data from the brains of model retinitis pigmentosa (RP) mice and previously studied Parkinson's disease (PD) mice were analyzed to explore the commonalities between retinal degenerative and neurodegenerative diseases. Differentially expressed genes in RP were compared with neurodegenerative disease-related genes and intersecting genes were identified, including Cnr1 and Septin14. These genes were verified by quantitative real-time reverse transcription PCR and Western blotting experiments. The key proteins CNR1 and SEPTIN14 were found to be potential cotherapeutic targets for retinal degeneration and neurodegenerative disease. In conclusion, understanding the commonalities between retinal degenerative diseases and neurodegenerative processes in the brain will not only facilitate the interpretation of the underlying pathomechanisms but also contribute to early diagnosis and the development of new therapeutic strategies.
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Affiliation(s)
- Ying Zhou
- State Key Laboratory of Digital
Medical Engineering, School of Biological Science & Medical Engineering, Southeast University, Nanjing 210096, China
| | - Yuwei Yang
- State Key Laboratory of Digital
Medical Engineering, School of Biological Science & Medical Engineering, Southeast University, Nanjing 210096, China
| | - Ting Qi
- State Key Laboratory of Digital
Medical Engineering, School of Biological Science & Medical Engineering, Southeast University, Nanjing 210096, China
| | - Zhuoran Hou
- State Key Laboratory of Digital
Medical Engineering, School of Biological Science & Medical Engineering, Southeast University, Nanjing 210096, China
| | - Qinyu Ge
- State Key Laboratory of Digital
Medical Engineering, School of Biological Science & Medical Engineering, Southeast University, Nanjing 210096, China
| | - Zuhong Lu
- State Key Laboratory of Digital
Medical Engineering, School of Biological Science & Medical Engineering, Southeast University, Nanjing 210096, China
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3
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Ng ESY, Hu J, Jiang Z, Radu RA. Impaired cathepsin D in retinal pigment epithelium cells mediates Stargardt disease pathogenesis. FASEB J 2024; 38:e23720. [PMID: 38837708 PMCID: PMC11296957 DOI: 10.1096/fj.202400210rr] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 05/12/2024] [Accepted: 05/21/2024] [Indexed: 06/07/2024]
Abstract
Recessive Stargardt disease (STGD1) is an inherited juvenile maculopathy caused by mutations in the ABCA4 gene, for which there is no suitable treatment. Loss of functional ABCA4 in the retinal pigment epithelium (RPE) alone, without contribution from photoreceptor cells, was shown to induce STGD1 pathology. Here, we identified cathepsin D (CatD), the primary RPE lysosomal protease, as a key molecular player contributing to endo-lysosomal dysfunction in STGD1 using a newly developed "disease-in-a-dish" RPE model from confirmed STGD1 patients. Induced pluripotent stem cell (iPSC)-derived RPE originating from three STGD1 patients exhibited elevated lysosomal pH, as previously reported in Abca4-/- mice. CatD protein maturation and activity were impaired in RPE from STGD1 patients and Abca4-/- mice. Consequently, STGD1 RPE cells have reduced photoreceptor outer segment degradation and abnormal accumulation of α-synuclein, the natural substrate of CatD. Furthermore, dysfunctional ABCA4 in STGD1 RPE cells results in intracellular accumulation of autofluorescent material and phosphatidylethanolamine (PE). The altered distribution of PE associated with the internal membranes of STGD1 RPE cells presumably compromises LC3-associated phagocytosis, contributing to delayed endo-lysosomal degradation activity. Drug-mediated re-acidification of lysosomes in the RPE of STGD1 restores CatD functional activity and reduces the accumulation of immature CatD protein loads. This preclinical study validates the contribution of CatD deficiencies to STGD1 pathology and provides evidence for an efficacious therapeutic approach targeting RPE cells. Our findings support a cell-autonomous RPE-driven pathology, informing future research aimed at targeting RPE cells to treat ABCA4-mediated retinopathies.
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Affiliation(s)
- Eunice Sze Yin Ng
- UCLA Stein Eye Institute, University of California, Los Angeles, CA 90095, USA
- Department of Ophthalmology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
- Molecular, Cellular, and Integrative Physiology Interdepartmental Program, University of California, Los Angeles, CA 90095, USA
| | - Jane Hu
- UCLA Stein Eye Institute, University of California, Los Angeles, CA 90095, USA
- Department of Ophthalmology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
| | - Zhichun Jiang
- UCLA Stein Eye Institute, University of California, Los Angeles, CA 90095, USA
- Department of Ophthalmology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
| | - Roxana A. Radu
- UCLA Stein Eye Institute, University of California, Los Angeles, CA 90095, USA
- Department of Ophthalmology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
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4
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Zhao Y, Sun B, Fu X, Zuo Z, Qin H, Yao K. YAP in development and disease: Navigating the regulatory landscape from retina to brain. Biomed Pharmacother 2024; 175:116703. [PMID: 38713948 DOI: 10.1016/j.biopha.2024.116703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 04/30/2024] [Accepted: 05/01/2024] [Indexed: 05/09/2024] Open
Abstract
The distinctive role of Yes-associated protein (YAP) in the nervous system has attracted widespread attention. This comprehensive review strategically uses the retina as a vantage point, embarking on an extensive exploration of YAP's multifaceted impact from the retina to the brain in development and pathology. Initially, we explore the crucial roles of YAP in embryonic and cerebral development. Our focus then shifts to retinal development, examining in detail YAP's regulatory influence on the development of retinal pigment epithelium (RPE) and retinal progenitor cells (RPCs), and its significant effects on the hierarchical structure and functionality of the retina. We also investigate the essential contributions of YAP in maintaining retinal homeostasis, highlighting its precise regulation of retinal cell proliferation and survival. In terms of retinal-related diseases, we explore the epigenetic connections and pathophysiological regulation of YAP in diabetic retinopathy (DR), glaucoma, and proliferative vitreoretinopathy (PVR). Lastly, we broaden our exploration from the retina to the brain, emphasizing the research paradigm of "retina: a window to the brain." Special focus is given to the emerging studies on YAP in brain disorders such as Alzheimer's disease (AD) and Parkinson's disease (PD), underlining its potential therapeutic value in neurodegenerative disorders and neuroinflammation.
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Affiliation(s)
- Yaqin Zhao
- Institute of Visual Neuroscience and Stem Cell Engineering, Wuhan University of Science and Technology, Wuhan 430065, China; College of Life Sciences and Health, Wuhan University of Science and Technology, Wuhan 430065, China
| | - Bin Sun
- Institute of Visual Neuroscience and Stem Cell Engineering, Wuhan University of Science and Technology, Wuhan 430065, China; College of Life Sciences and Health, Wuhan University of Science and Technology, Wuhan 430065, China
| | - Xuefei Fu
- Institute of Visual Neuroscience and Stem Cell Engineering, Wuhan University of Science and Technology, Wuhan 430065, China; College of Life Sciences and Health, Wuhan University of Science and Technology, Wuhan 430065, China
| | - Zhuan Zuo
- Institute of Visual Neuroscience and Stem Cell Engineering, Wuhan University of Science and Technology, Wuhan 430065, China; College of Life Sciences and Health, Wuhan University of Science and Technology, Wuhan 430065, China
| | - Huan Qin
- Institute of Visual Neuroscience and Stem Cell Engineering, Wuhan University of Science and Technology, Wuhan 430065, China; College of Life Sciences and Health, Wuhan University of Science and Technology, Wuhan 430065, China.
| | - Kai Yao
- Institute of Visual Neuroscience and Stem Cell Engineering, Wuhan University of Science and Technology, Wuhan 430065, China; College of Life Sciences and Health, Wuhan University of Science and Technology, Wuhan 430065, China.
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Rombaut A, Jovancevic D, Wong RCB, Nicol A, Brautaset R, Finkelstein DI, Nguyen CTO, Tribble JR, Williams PA. Intravitreal MPTP drives retinal ganglion cell loss with oral nicotinamide treatment providing robust neuroprotection. Acta Neuropathol Commun 2024; 12:79. [PMID: 38773545 PMCID: PMC11107037 DOI: 10.1186/s40478-024-01782-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Accepted: 04/16/2024] [Indexed: 05/24/2024] Open
Abstract
Neurodegenerative diseases have common underlying pathological mechanisms including progressive neuronal dysfunction, axonal and dendritic retraction, and mitochondrial dysfunction resulting in neuronal death. The retina is often affected in common neurodegenerative diseases such as Parkinson's and Alzheimer's disease. Studies have demonstrated that the retina in patients with Parkinson's disease undergoes changes that parallel the dysfunction in the brain. These changes classically include decreased levels of dopamine, accumulation of alpha-synuclein in the brain and retina, and death of dopaminergic nigral neurons and retinal amacrine cells leading to gross neuronal loss. Exploring this disease's retinal phenotype and vision-related symptoms is an important window for elucidating its pathophysiology and progression, and identifying novel ways to diagnose and treat Parkinson's disease. 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) is commonly used to model Parkinson's disease in animal models. MPTP is a neurotoxin converted to its toxic form by astrocytes, transported to neurons through the dopamine transporter, where it causes mitochondrial Complex I inhibition and neuron degeneration. Systemic administration of MPTP induces retinal changes in different animal models. In this study, we assessed the effects of MPTP on the retina directly via intravitreal injection in mice (5 mg/mL and 50 mg/mL to 7, 14 and 21 days post-injection). MPTP treatment induced the reduction of retinal ganglion cells-a sensitive neuron in the retina-at all time points investigated. This occurred without a concomitant loss of dopaminergic amacrine cells or neuroinflammation at any of the time points or concentrations tested. The observed neurodegeneration which initially affected retinal ganglion cells indicated that this method of MPTP administration could yield a fast and straightforward model of retinal ganglion cell neurodegeneration. To assess whether this model could be amenable to neuroprotection, mice were treated orally with nicotinamide (a nicotinamide adenine dinucleotide precursor) which has been demonstrated to be neuroprotective in several retinal ganglion cell injury models. Nicotinamide was strongly protective following intravitreal MPTP administration, further supporting intravitreal MPTP use as a model of retinal ganglion cell injury. As such, this model could be utilized for testing neuroprotective treatments in the context of Parkinson's disease and retinal ganglion cell injury.
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Affiliation(s)
- Anne Rombaut
- Department of Clinical Neuroscience, Division of Eye and Vision, St. Erik Eye Hospital, Karolinska Institutet, Stockholm, Sweden
| | - Danica Jovancevic
- Department of Clinical Neuroscience, Division of Eye and Vision, St. Erik Eye Hospital, Karolinska Institutet, Stockholm, Sweden
| | - Raymond Ching-Bong Wong
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, Melbourne, Australia
- Department of Surgery (Ophthalmology), The University of Melbourne, Melbourne, Australia
| | - Alan Nicol
- Department of Clinical Neuroscience, Division of Eye and Vision, St. Erik Eye Hospital, Karolinska Institutet, Stockholm, Sweden
| | - Rune Brautaset
- Department of Clinical Neuroscience, Division of Eye and Vision, St. Erik Eye Hospital, Karolinska Institutet, Stockholm, Sweden
| | - David I Finkelstein
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Australia
| | - Christine T O Nguyen
- Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, Australia
| | - James R Tribble
- Department of Clinical Neuroscience, Division of Eye and Vision, St. Erik Eye Hospital, Karolinska Institutet, Stockholm, Sweden.
| | - Pete A Williams
- Department of Clinical Neuroscience, Division of Eye and Vision, St. Erik Eye Hospital, Karolinska Institutet, Stockholm, Sweden.
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6
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Tan YY, Kang HG, Lee CJ, Kim SS, Park S, Thakur S, Da Soh Z, Cho Y, Peng Q, Lee K, Tham YC, Rim TH, Cheng CY. Prognostic potentials of AI in ophthalmology: systemic disease forecasting via retinal imaging. EYE AND VISION (LONDON, ENGLAND) 2024; 11:17. [PMID: 38711111 PMCID: PMC11071258 DOI: 10.1186/s40662-024-00384-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 04/17/2024] [Indexed: 05/08/2024]
Abstract
BACKGROUND Artificial intelligence (AI) that utilizes deep learning (DL) has potential for systemic disease prediction using retinal imaging. The retina's unique features enable non-invasive visualization of the central nervous system and microvascular circulation, aiding early detection and personalized treatment plans for personalized care. This review explores the value of retinal assessment, AI-based retinal biomarkers, and the importance of longitudinal prediction models in personalized care. MAIN TEXT This narrative review extensively surveys the literature for relevant studies in PubMed and Google Scholar, investigating the application of AI-based retina biomarkers in predicting systemic diseases using retinal fundus photography. The study settings, sample sizes, utilized AI models and corresponding results were extracted and analysed. This review highlights the substantial potential of AI-based retinal biomarkers in predicting neurodegenerative, cardiovascular, and chronic kidney diseases. Notably, DL algorithms have demonstrated effectiveness in identifying retinal image features associated with cognitive decline, dementia, Parkinson's disease, and cardiovascular risk factors. Furthermore, longitudinal prediction models leveraging retinal images have shown potential in continuous disease risk assessment and early detection. AI-based retinal biomarkers are non-invasive, accurate, and efficient for disease forecasting and personalized care. CONCLUSION AI-based retinal imaging hold promise in transforming primary care and systemic disease management. Together, the retina's unique features and the power of AI enable early detection, risk stratification, and help revolutionizing disease management plans. However, to fully realize the potential of AI in this domain, further research and validation in real-world settings are essential.
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Affiliation(s)
| | - Hyun Goo Kang
- Division of Retina, Severance Eye Hospital, Yonsei University College of Medicine, Seoul, South Korea
| | - Chan Joo Lee
- Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, South Korea
| | - Sung Soo Kim
- Division of Retina, Severance Eye Hospital, Yonsei University College of Medicine, Seoul, South Korea
| | - Sungha Park
- Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, South Korea
| | - Sahil Thakur
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
| | - Zhi Da Soh
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
- Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Yunnie Cho
- Mediwhale Inc, Seoul, Republic of Korea
- Department of Education and Human Resource Development, Seoul National University Hospital, Seoul, South Korea
| | - Qingsheng Peng
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
| | - Kwanghyun Lee
- Department of Ophthalmology, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea
| | - Yih-Chung Tham
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
- Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Centre for Innovation and Precision Eye Health, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Ophthalmology and Visual Sciences Academic Clinical Program, Singapore, Singapore
| | - Tyler Hyungtaek Rim
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore.
- Mediwhale Inc, Seoul, Republic of Korea.
| | - Ching-Yu Cheng
- Singapore Eye Research Institute, Singapore National Eye Centre, Singapore, Singapore
- Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Centre for Innovation and Precision Eye Health, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Ophthalmology and Visual Sciences Academic Clinical Program, Singapore, Singapore
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7
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Xu T, Liu X, Lin X, Xiao J, Zhang D, Ye F, Lu F, Qu J, Zhang J, Chen JF. Abnormal α-Synuclein Aggregates Cause Synaptic- and Microcircuit-Specific Deficits in the Retinal Rod Pathway. THE AMERICAN JOURNAL OF PATHOLOGY 2024; 194:796-809. [PMID: 38395146 DOI: 10.1016/j.ajpath.2024.01.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 11/30/2023] [Accepted: 01/10/2024] [Indexed: 02/25/2024]
Abstract
α-Synuclein (α-Syn) is a key determinator of Parkinson disease (PD) pathology, but synapse and microcircuit pathologies in the retina underlying visual dysfunction are poorly understood. Herein, histochemical and ultrastructural analyses and ophthalmologic measurements in old transgenic M83 PD model (mice aged 16 to 18 months) indicated that abnormal α-Syn aggregation in the outer plexiform layer (OPL) was associated with degeneration in the C-terminal binding protein 2 (CtBP2)+ ribbon synapses of photoreceptor terminals and protein kinase C alpha (PKCα)+ rod bipolar cell terminals, whereas α-Syn aggregates in the inner retina correlated with the reduction and degeneration of tyrosine hydroxylase- and parvalbumin-positive amacrine cells. Phosphorylated Ser129 α-synuclein expression was strikingly restricted in the OPL, with the most severe degenerations in the entire retina, including mitochondrial degeneration and loss of ribbon synapses in 16- to 18-month-old mice. These synapse- and microcircuit-specific deficits of the rod pathway at the CtBP2+ rod terminals and PKCα+ rod bipolar and amacrine cells were associated with attenuated a- and b-wave amplitudes and oscillatory potentials on the electroretinogram. They were also associated with the impairment of visual functions, including reduced contrast sensitivity and impairment of the middle range of spatial frequencies. Collectively, these findings demonstrate that α-Syn aggregates cause the synapse- and microcircuit-specific deficits of the rod pathway and the most severe damage to the OPL, providing the retinal synaptic and microcircuit basis for visual dysfunctions in PD.
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Affiliation(s)
- Tao Xu
- Molecular Neuropharmacology Laboratory and the Eye-Brain Research Center, Wenzhou Medical University, Wenzhou, China; State Key Laboratory of Ophthalmology, Optometry and Vision Science, Wenzhou Medical University, Wenzhou, China; Oujiang Laboratory, Wenzhou, China
| | - Xin Liu
- Molecular Neuropharmacology Laboratory and the Eye-Brain Research Center, Wenzhou Medical University, Wenzhou, China; State Key Laboratory of Ophthalmology, Optometry and Vision Science, Wenzhou Medical University, Wenzhou, China
| | - Xin Lin
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, Wenzhou Medical University, Wenzhou, China; Affiliated Eye Hospital, Wenzhou Medical University, Wenzhou, China
| | - Jiayi Xiao
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, Wenzhou Medical University, Wenzhou, China; Affiliated Eye Hospital, Wenzhou Medical University, Wenzhou, China
| | - Di Zhang
- Molecular Neuropharmacology Laboratory and the Eye-Brain Research Center, Wenzhou Medical University, Wenzhou, China; Affiliated Eye Hospital, Wenzhou Medical University, Wenzhou, China
| | - Fenfen Ye
- Molecular Neuropharmacology Laboratory and the Eye-Brain Research Center, Wenzhou Medical University, Wenzhou, China; Affiliated Eye Hospital, Wenzhou Medical University, Wenzhou, China
| | - Fan Lu
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, Wenzhou Medical University, Wenzhou, China; Oujiang Laboratory, Wenzhou, China; Affiliated Eye Hospital, Wenzhou Medical University, Wenzhou, China
| | - Jia Qu
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, Wenzhou Medical University, Wenzhou, China; Oujiang Laboratory, Wenzhou, China; Affiliated Eye Hospital, Wenzhou Medical University, Wenzhou, China
| | - Jun Zhang
- State Key Laboratory of Ophthalmology, Optometry and Vision Science, Wenzhou Medical University, Wenzhou, China; Affiliated Eye Hospital, Wenzhou Medical University, Wenzhou, China.
| | - Jiang-Fan Chen
- Molecular Neuropharmacology Laboratory and the Eye-Brain Research Center, Wenzhou Medical University, Wenzhou, China; State Key Laboratory of Ophthalmology, Optometry and Vision Science, Wenzhou Medical University, Wenzhou, China; Oujiang Laboratory, Wenzhou, China.
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Amini E, Rohani M, Fasano A, Azad Z, Miri S, Habibi SAH, Emamikhah M, Mirshahi R, Joghataei MT, Gholibeigian Z, Ghasemi Falavarjani K. Neurodegeneration with Brain Iron Accumulation Disorders and Retinal Neurovascular Structure. Mov Disord 2024; 39:411-423. [PMID: 37947042 DOI: 10.1002/mds.29644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 10/07/2023] [Accepted: 10/10/2023] [Indexed: 11/12/2023] Open
Abstract
BACKGROUND The unique neurovascular structure of the retina has provided an opportunity to observe brain pathology in many neurological disorders. However, such studies on neurodegeneration with brain iron accumulation (NBIA) disorders are lacking. OBJECTIVES To investigate NBIA's neurological and ophthalmological manifestations. METHODS This cross-sectional study was conducted on genetically confirmed NBIA patients and an age-gender-matched control group. The thickness of retinal layers, central choroidal thickness (CCT), and capillary plexus densities were measured by spectral domain-optical coherence tomography (SD-OCT) and OCT angiography, respectively. The patients also underwent funduscopy, electroretinography (ERG), visual evoked potential (VEP), and neurological examination (Pantothenate-Kinase Associated Neurodegeneration-Disease Rating Scale [PKAN-DRS]). The generalized estimating equation model was used to consider inter-eye correlations. RESULTS Seventy-four patients' and 80 controls' eyes were analyzed. Patients had significantly decreased visual acuity, reduced inner or outer sectors of almost all evaluated layers, increased CCT, and decreased vessel densities, with abnormal VEP and ERG in 32.4% and 45.9%, respectively. There were correlations between visual acuity and temporal peripapillary nerve fiber layer (positive) and between PKAN-DRS score and disease duration (negative), and scotopic b-wave amplitudes (positive). When considering only the PKAN eyes, ONL was among the significantly decreased retinal layers, with no differences in retinal vessel densities. Evidence of pachychoroid was only seen in patients with Kufor Rakeb syndrome. CONCLUSION Observing pathologic structural and functional neurovascular changes in NBIA patients may provide an opportunity to elucidate the underlying mechanisms and differential retinal biomarkers in NBIA subtypes in further investigations. © 2023 International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Elahe Amini
- ENT and Head and Neck Research Center, The Five Senses Health Institute, Iran University of Medical Sciences, Tehran, Iran
- Department of Neurology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Mohammad Rohani
- Department of Neurology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
- Skull Base Research Center, The Five Senses Health Institute, Iran University of Medical Sciences, Tehran, Iran
| | - Alfonso Fasano
- University Health Network University of Toronto, Toronto, Ontario, Canada
| | - Zahra Azad
- Skull Base Research Center, The Five Senses Health Institute, Iran University of Medical Sciences, Tehran, Iran
| | - Shahnaz Miri
- Vision Neurology Center, San Francisco, California, USA
| | - Seyed Amir Hassan Habibi
- Department of Neurology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
- Skull Base Research Center, The Five Senses Health Institute, Iran University of Medical Sciences, Tehran, Iran
| | - Maziar Emamikhah
- Department of Neurology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
- Skull Base Research Center, The Five Senses Health Institute, Iran University of Medical Sciences, Tehran, Iran
| | - Reza Mirshahi
- Eye Research Center, The Five Senses Health Institute, Iran University of Medical Sciences, Tehran, Iran
| | | | - Zeinab Gholibeigian
- Skull Base Research Center, The Five Senses Health Institute, Iran University of Medical Sciences, Tehran, Iran
| | - Khalil Ghasemi Falavarjani
- Eye Research Center, The Five Senses Health Institute, Iran University of Medical Sciences, Tehran, Iran
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9
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Gao J, Leinonen H, Wang EJ, Ding M, Perry G, Palczewski K, Wang X. Sex-Specific Early Retinal Dysfunction in Mutant TDP-43 Transgenic Mice. J Alzheimers Dis 2024; 97:927-937. [PMID: 38143367 PMCID: PMC11174142 DOI: 10.3233/jad-231102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2023]
Abstract
BACKGROUND Increasing evidence has highlighted retinal impairments in neurodegenerative diseases. Dominant mutations in TAR DNA-binding protein 43 (TDP-43) cause amyotrophic lateral sclerosis (ALS), and the accumulation of TDP-43 in the cytoplasm is a pathological hallmark of ALS, frontotemporal dementia (FTD), and many other neurodegenerative diseases. OBJECTIVE While homozygous transgenic mice expressing the disease-causing human TDP-43 M337V mutant (TDP-43M337V mice) experience premature death, hemizygous TDP-43M337V mice do not suffer sudden death, but they exhibit age-dependent motor-coordinative and cognitive deficits. This study aims to leverage the hemizygous TDP-43M337V mice as a valuable ALS/FTD disease model for the assessment also of retinal changes during the disease progression. METHODS We evaluated the retinal function of young TDP-43M337V mice by full field electroretinogram (ERG) recordings. RESULTS At 3-4 months of age, well before the onset of brain dysfunction at 8 months, the ERG responses were notably impaired in the retinas of young female TDP-43M337V mice in contrast to their male counterparts and age-matched non-transgenic mice. Mitochondria have been implicated as critical targets of TDP-43. Further investigation revealed that significant changes in the key regulators of mitochondrial dynamics and bioenergetics were only observed in the retinas of young female TDP-43M337V mice, while these alterations were not present in the brains of either gender. CONCLUSIONS Together our findings suggest a sex-specific vulnerability within the retina in the early disease stage, and highlight the importance of retinal changes and mitochondrial markers as potential early diagnostic indicators for ALS, FTD, and other TDP-43 related neurodegenerative conditions.
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Affiliation(s)
- Ju Gao
- Department of Pharmacology and Toxicology, University of Arizona, Tucson, AZ, USA
| | - Henri Leinonen
- School of Pharmacy, University of Eastern Finland, 70211 Kuopio, Finland
| | - Evan J Wang
- Department of Pathology, Case Western Reserve University, Cleveland, OH, USA
| | - Mao Ding
- Department of Pharmacology and Toxicology, University of Arizona, Tucson, AZ, USA
| | - George Perry
- College of Sciences, University of Texas at San Antonio, San Antonio, TX, USA
| | - Krzysztof Palczewski
- Department of Ophthalmology, Gavin Herbert Eye Institute, UCI, Irvine, CA, USA
- Department of Physiology and Biophysics, Chemistry and Molecular biology and Biochemsitry, UCI, Irvine, CA, USA
| | - Xinglong Wang
- Department of Pharmacology and Toxicology, University of Arizona, Tucson, AZ, USA
- Department of Pathology, Case Western Reserve University, Cleveland, OH, USA
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10
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Chrysou A, Heikka T, van der Zee S, Boertien JM, Jansonius NM, van Laar T. Reduced Thickness of the Retina in de novo Parkinson's Disease Shows A Distinct Pattern, Different from Glaucoma. JOURNAL OF PARKINSON'S DISEASE 2024; 14:507-519. [PMID: 38517802 DOI: 10.3233/jpd-223481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/24/2024]
Abstract
Background Parkinson's disease (PD) patients experience visual symptoms and retinal degeneration. Studies using optical coherence tomography (OCT) have shown reduced thickness of the retina in PD, also a key characteristic of glaucoma. Objective To identify the presence and pattern of retinal changes in de novo, treatment-naive PD patients compared to healthy controls (HC) and early primary open angle glaucoma (POAG) patients. Methods Macular OCT data (10×10 mm) were collected from HC, PD, and early POAG patients, at the University Medical Center Groningen. Bayesian informative hypotheses statistical analyses were carried out comparing HC, PD-, and POAG patients, within each retinal cell layer. Results In total 100 HC, 121 PD, and 78 POAG patients were included. We showed significant reduced thickness of the inner plexiform layer and retinal pigment epithelium in PD compared to HC. POAG patients presented with a significantly thinner retinal nerve fiber layer, ganglion cell layer, inner plexiform layer, outer plexiform layer, and outer photoreceptor and subretinal virtual space compared to PD. Only the outer segment layer and retinal pigment epithelium were significantly thinner in PD compared to POAG. Conclusions De novo PD patients show reduced thickness of the retina compared to HC, especially of the inner plexiform layer, which differs significantly from POAG, showing a more extensive and widespread pattern of reduced thickness across layers. OCT is a useful tool to detect retinal changes in de novo PD, but its specificity versus other neurodegenerative disorders has to be established.
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Affiliation(s)
- Asterios Chrysou
- Department of Neurology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Tuomas Heikka
- Department of Ophthalmology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Sygrid van der Zee
- Department of Neurology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Jeffrey M Boertien
- Department of Neurology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Nomdo M Jansonius
- Department of Ophthalmology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Teus van Laar
- Department of Neurology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
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11
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Camacho-Ordonez A, Cervantes-Arriaga A, Rodríguez-Violante M, Hernandez-Medrano AJ, Somilleda-Ventura SA, Pérez-Cano HJ, Nava-Castañeda Á, Guerrero-Berger O. Is there any correlation between alpha-synuclein levels in tears and retinal layer thickness in Parkinson's disease? Eur J Ophthalmol 2024; 34:252-259. [PMID: 37151018 DOI: 10.1177/11206721231173725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
PURPOSE To determine the total alpha-synuclein (αSyn) reflex tears and its association with retinal layers thickness in Parkinson's disease (PD). METHODS Fifty-two eyes of 26 PD subjects and 52 eyes of age-and sex-matched healthy controls were included. Total αSyn in reflex tears was quantified using a human total αSyn enzyme-linked immunosorbent assay (ELISA) kit. The retinal thickness was evaluated with spectral-domain optical coherence tomography. The Movement Disorder Society-Unified Parkinsońs Disease Rating Scale (MDS-UPDRS), Non-Motor Symptoms Scale (NMSS), and Montreal Cognitive Assessment (MoCA) were used to assess motor, non-motor, and cognition. RESULTS In PD, total αSyn levels were increased compared to control subjects [1.76pg/mL (IQR 1.74-1.80) vs 1.73pg/mL (IQR 1.70-1.77), p < 0.004]. The nerve fiber layer, ganglion cell layer, internal plexiform layer, inner nuclear layer, and outer nuclear layer were thinner in PD in comparison with controls (p < 0.05). The outer plexiform layer and retinal pigment epithelium were thicker in PD (p < 0.05). The total αSyn levels positively correlated with the central volume of the inner nuclear layer (r = 0.357, p = 0.009). CONCLUSION Total αSyn reflex tear levels were increased in subjects with PD compared to controls. PD patients showed significant thinning of the inner retinal layers and thickening of outer retinal layers in comparison with controls. Total αSyn levels positively correlate with the central volume of the inner nuclear layer in PD. The combination of these biomarkers might have a possible role as a diagnostic tool in PD subjects.
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Affiliation(s)
- Azyadeh Camacho-Ordonez
- Neuro-ophthalmology Clinic, National Institute of Neurology and Neurosurgery, Mexico City, Mexico
- Anterior Segment Department, Fundacion Hospital Nuestra Señora de la Luz, IAP, Mexico City, Mexico
| | - Amin Cervantes-Arriaga
- Movement Disorder Clinic, National Institute of Neurology and Neurosurgery, Mexico City, Mexico
| | | | | | | | - Hector J Pérez-Cano
- Biomedical Research Center, Fundacion Hospital Nuestra Señora de la Luz, IAP, Mexico City, Mexico
| | - Ángel Nava-Castañeda
- Oculoplastics Department, Instituto de Oftalmologia Fundacion Conde de Valenciana IAP, Mexico City, Mexico
| | - Oscar Guerrero-Berger
- Anterior Segment Department, Fundacion Hospital Nuestra Señora de la Luz, IAP, Mexico City, Mexico
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12
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Tran KK, Lee PY, Finkelstein DI, McKendrick AM, Nguyen BN, Bui BV, Nguyen CT. Altered Outer Retinal Structure, Electrophysiology and Visual Perception in Parkinson's Disease. JOURNAL OF PARKINSON'S DISEASE 2024; 14:167-180. [PMID: 38189711 PMCID: PMC10836541 DOI: 10.3233/jpd-230293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/19/2023] [Indexed: 01/09/2024]
Abstract
BACKGROUND Visual biomarkers of Parkinson's disease (PD) are attractive as the retina is an outpouching of the brain. Although inner retinal neurodegeneration in PD is well-established this has overlap with other neurodegenerative diseases and thus outer retinal (photoreceptor) measures warrant further investigation. OBJECTIVE To examine in a cross-sectional study whether clinically implementable measures targeting outer retinal function and structure can differentiate PD from healthy ageing and whether these are sensitive to intraday levodopa (L-DOPA) dosing. METHODS Centre-surround perceptual contrast suppression, macular visual field sensitivity, colour discrimination, light-adapted electroretinography and optical coherence tomography (OCT) were tested in PD participants (n = 16) and controls (n = 21). Electroretinography and OCT were conducted before and after midday L-DOPA in PD participants, or repeated after ∼2 hours in controls. RESULTS PD participants had decreased center-surround contrast suppression (p < 0.01), reduced macular visual field sensitivity (p < 0.05), color vision impairment (p < 0.01) photoreceptor dysfunction (a-wave, p < 0.01) and photoreceptor neurodegeneration (outer nuclear layer thinning, p < 0.05), relative to controls. Effect size comparison between inner and outer retinal parameters showed that photoreceptor metrics were similarly robust in differentiating the PD group from age-matched controls as inner retinal changes. Electroretinography and OCT were unaffected by L-DOPA treatment or time. CONCLUSIONS We show that outer retinal outcomes of photoreceptoral dysfunction (decreased cone function and impaired color vision) and degeneration (i.e., outer nuclear layer thinning) were equivalent to inner retinal metrics at differentiating PD from healthy age-matched adults. These findings suggest outer retinal metrics may serve as useful biomarkers for PD.
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Affiliation(s)
- Katie K.N. Tran
- Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, VIC, Australia
| | - Pei Ying Lee
- Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, VIC, Australia
| | - David I. Finkelstein
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, VIC, Australia
| | - Allison M. McKendrick
- Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, VIC, Australia
- Division of Optometry, School of Allied Health, The University of Western Australia, Crawley, WA, Australia
- Lions Eye Institute, Nedlands, WA, Australia
| | - Bao N. Nguyen
- Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, VIC, Australia
| | - Bang V. Bui
- Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, VIC, Australia
| | - Christine T.O. Nguyen
- Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, VIC, Australia
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13
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Kowalski A, Betzer C, Larsen ST, Gregersen E, Newcombe EA, Bermejo MC, Bendtsen VW, Diemer J, Ernstsen CV, Jain S, Bou AE, Langkilde AE, Nejsum LN, Klipp E, Edwards R, Kragelund BB, Jensen PH, Nissen P. Monomeric α-synuclein activates the plasma membrane calcium pump. EMBO J 2023; 42:e111122. [PMID: 37916890 PMCID: PMC10690453 DOI: 10.15252/embj.2022111122] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 09/19/2023] [Accepted: 10/11/2023] [Indexed: 11/03/2023] Open
Abstract
Alpha-synuclein (aSN) is a membrane-associated and intrinsically disordered protein, well known for pathological aggregation in neurodegeneration. However, the physiological function of aSN is disputed. Pull-down experiments have pointed to plasma membrane Ca2+ -ATPase (PMCA) as a potential interaction partner. From proximity ligation assays, we find that aSN and PMCA colocalize at neuronal synapses, and we show that calcium expulsion is activated by aSN and PMCA. We further show that soluble, monomeric aSN activates PMCA at par with calmodulin, but independent of the autoinhibitory domain of PMCA, and highly dependent on acidic phospholipids and membrane-anchoring properties of aSN. On PMCA, the key site is mapped to the acidic lipid-binding site, located within a disordered PMCA-specific loop connecting the cytosolic A domain and transmembrane segment 3. Our studies point toward a novel physiological role of monomeric aSN as a stimulator of calcium clearance in neurons through activation of PMCA.
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Affiliation(s)
- Antoni Kowalski
- Department of Molecular Biology and GeneticsAarhus UniversityAarhusDenmark
- Danish Research Institute of Translational Neuroscience – DANDRITEAarhus UniversityAarhusDenmark
- REPIN and Structural Biology and NMR Laboratory, Department of BiologyUniversity of CopenhagenCopenhagenDenmark
- Department of Molecular NeurochemistryMedical University of LodzLodzPoland
- Present address:
ImmunAware ApSHørsholmDenmark
| | - Cristine Betzer
- Danish Research Institute of Translational Neuroscience – DANDRITEAarhus UniversityAarhusDenmark
- Department of BiomedicineAarhus UniversityAarhusDenmark
- Present address:
Region Midtjylland, Regionshospitalet GødstrupHerningDenmark
| | - Sigrid Thirup Larsen
- Department of Molecular Biology and GeneticsAarhus UniversityAarhusDenmark
- Danish Research Institute of Translational Neuroscience – DANDRITEAarhus UniversityAarhusDenmark
| | - Emil Gregersen
- Danish Research Institute of Translational Neuroscience – DANDRITEAarhus UniversityAarhusDenmark
- Department of BiomedicineAarhus UniversityAarhusDenmark
- Present address:
Department of Clinical MedicineAarhus UniversityAarhus NDenmark
| | - Estella A Newcombe
- REPIN and Structural Biology and NMR Laboratory, Department of BiologyUniversity of CopenhagenCopenhagenDenmark
| | - Montaña Caballero Bermejo
- Department of Molecular Biology and GeneticsAarhus UniversityAarhusDenmark
- Danish Research Institute of Translational Neuroscience – DANDRITEAarhus UniversityAarhusDenmark
- Department Biochemistry and Molecular Biology and Genetics, IBMPUniversity of ExtremaduraBadajozSpain
| | - Viktor Wisniewski Bendtsen
- Department of Molecular Biology and GeneticsAarhus UniversityAarhusDenmark
- Danish Research Institute of Translational Neuroscience – DANDRITEAarhus UniversityAarhusDenmark
| | - Jorin Diemer
- Theoretical BiophysicsHumboldt‐Universität zu BerlinBerlinGermany
| | | | - Shweta Jain
- Departments of Neurology and PhysiologyUniversity of California San FranciscoSan FranciscoCAUSA
| | - Alicia Espiña Bou
- Department of Molecular Biology and GeneticsAarhus UniversityAarhusDenmark
- Danish Research Institute of Translational Neuroscience – DANDRITEAarhus UniversityAarhusDenmark
| | | | - Lene N Nejsum
- Department of Clinical MedicineAarhus UniversityAarhus NDenmark
| | - Edda Klipp
- Theoretical BiophysicsHumboldt‐Universität zu BerlinBerlinGermany
| | - Robert Edwards
- Departments of Neurology and PhysiologyUniversity of California San FranciscoSan FranciscoCAUSA
| | - Birthe B Kragelund
- REPIN and Structural Biology and NMR Laboratory, Department of BiologyUniversity of CopenhagenCopenhagenDenmark
| | - Poul Henning Jensen
- Danish Research Institute of Translational Neuroscience – DANDRITEAarhus UniversityAarhusDenmark
- Department of BiomedicineAarhus UniversityAarhusDenmark
| | - Poul Nissen
- Department of Molecular Biology and GeneticsAarhus UniversityAarhusDenmark
- Danish Research Institute of Translational Neuroscience – DANDRITEAarhus UniversityAarhusDenmark
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14
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Subramaniam MD, Aishwarya Janaki P, Abishek Kumar B, Gopalarethinam J, Nair AP, Mahalaxmi I, Vellingiri B. Retinal Changes in Parkinson's Disease: A Non-invasive Biomarker for Early Diagnosis. Cell Mol Neurobiol 2023; 43:3983-3996. [PMID: 37831228 DOI: 10.1007/s10571-023-01419-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 09/24/2023] [Indexed: 10/14/2023]
Abstract
Parkinson's disease (PD) is caused due to degeneration of dopaminergic neurons in the substantia nigra pars compacta (SNpc) which leads to the depletion of dopamine in the body. The lack of dopamine is mainly due to aggregation of misfolded α-synuclein which causes motor impairment in PD. Dopamine is also required for normal retinal function and the light-dark vision cycle. Misfolded α-synuclein present in inner retinal layers causes vision-associated problems in PD patients. Hence, individuals with PD also experience structural and functional changes in the retina. Mutation in LRRK2, PARK2, PARK7, PINK1, or SNCA genes and mitochondria dysfunction also play a role in the pathophysiology of PD. In this review, we discussed the different etiologies which lead to PD and future prospects of employing non-invasive techniques and retinal changes to diagnose the onset of PD earlier.
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Affiliation(s)
- Mohana Devi Subramaniam
- SN ONGC Department of Genetics and Molecular Biology, Vision Research Foundation, Sankara Nethralaya, Chennai, Tamil Nadu, 600 006, India.
| | - P Aishwarya Janaki
- SN ONGC Department of Genetics and Molecular Biology, Vision Research Foundation, Sankara Nethralaya, Chennai, Tamil Nadu, 600 006, India
| | - B Abishek Kumar
- SN ONGC Department of Genetics and Molecular Biology, Vision Research Foundation, Sankara Nethralaya, Chennai, Tamil Nadu, 600 006, India
| | - Janani Gopalarethinam
- SN ONGC Department of Genetics and Molecular Biology, Vision Research Foundation, Sankara Nethralaya, Chennai, Tamil Nadu, 600 006, India
| | - Aswathy P Nair
- SN ONGC Department of Genetics and Molecular Biology, Vision Research Foundation, Sankara Nethralaya, Chennai, Tamil Nadu, 600 006, India
| | - I Mahalaxmi
- Department of Biotechnology, Karpagam Academy of Higher Education (Deemed to be University), Coimbatore, 641021, India
| | - Balachandar Vellingiri
- Department of Zoology, School of Basic Sciences, Central University of Punjab, Bathinda, India
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15
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Wagner SK, Romero-Bascones D, Cortina-Borja M, Williamson DJ, Struyven RR, Zhou Y, Patel S, Weil RS, Antoniades CA, Topol EJ, Korot E, Foster PJ, Balaskas K, Ayala U, Barrenechea M, Gabilondo I, Schapira AHV, Khawaja AP, Patel PJ, Rahi JS, Denniston AK, Petzold A, Keane PA. Retinal Optical Coherence Tomography Features Associated With Incident and Prevalent Parkinson Disease. Neurology 2023; 101:e1581-e1593. [PMID: 37604659 PMCID: PMC10585674 DOI: 10.1212/wnl.0000000000207727] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 06/14/2023] [Indexed: 08/23/2023] Open
Abstract
BACKGROUND AND OBJECTIVES Cadaveric studies have shown disease-related neurodegeneration and other morphological abnormalities in the retina of individuals with Parkinson disease (PD); however, it remains unclear whether this can be reliably detected with in vivo imaging. We investigated inner retinal anatomy, measured using optical coherence tomography (OCT), in prevalent PD and subsequently assessed the association of these markers with the development of PD using a prospective research cohort. METHODS This cross-sectional analysis used data from 2 studies. For the detection of retinal markers in prevalent PD, we used data from AlzEye, a retrospective cohort of 154,830 patients aged 40 years and older attending secondary care ophthalmic hospitals in London, United Kingdom, between 2008 and 2018. For the evaluation of retinal markers in incident PD, we used data from UK Biobank, a prospective population-based cohort where 67,311 volunteers aged 40-69 years were recruited between 2006 and 2010 and underwent retinal imaging. Macular retinal nerve fiber layer (mRNFL), ganglion cell-inner plexiform layer (GCIPL), and inner nuclear layer (INL) thicknesses were extracted from fovea-centered OCT. Linear mixed-effects models were fitted to examine the association between prevalent PD and retinal thicknesses. Hazard ratios for the association between time to PD diagnosis and retinal thicknesses were estimated using frailty models. RESULTS Within the AlzEye cohort, there were 700 individuals with prevalent PD and 105,770 controls (mean age 65.5 ± 13.5 years, 51.7% female). Individuals with prevalent PD had thinner GCIPL (-2.12 μm, 95% CI -3.17 to -1.07, p = 8.2 × 10-5) and INL (-0.99 μm, 95% CI -1.52 to -0.47, p = 2.1 × 10-4). The UK Biobank included 50,405 participants (mean age 56.1 ± 8.2 years, 54.7% female), of whom 53 developed PD at a mean of 2,653 ± 851 days. Thinner GCIPL (hazard ratio [HR] 0.62 per SD increase, 95% CI 0.46-0.84, p = 0.002) and thinner INL (HR 0.70, 95% CI 0.51-0.96, p = 0.026) were also associated with incident PD. DISCUSSION Individuals with PD have reduced thickness of the INL and GCIPL of the retina. Involvement of these layers several years before clinical presentation highlight a potential role for retinal imaging for at-risk stratification of PD.
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Affiliation(s)
- Siegfried Karl Wagner
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom.
| | - David Romero-Bascones
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Mario Cortina-Borja
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Dominic J Williamson
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Robbert R Struyven
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Yukun Zhou
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Salil Patel
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Rimona S Weil
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Chrystalina A Antoniades
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Eric J Topol
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Edward Korot
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Paul J Foster
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Konstantinos Balaskas
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Unai Ayala
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Maitane Barrenechea
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Iñigo Gabilondo
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Anthony H V Schapira
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Anthony P Khawaja
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Praveen J Patel
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Jugnoo S Rahi
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Alastair K Denniston
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Axel Petzold
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
| | - Pearse Andrew Keane
- From the Institute of Ophthalmology (S.K.W., D.J.W., R.R.S., Y.Z., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.P., P.A.K.), University College London; NIHR Biomedical Research Centre at Moorfields Eye Hospital and UCL Institute of Ophthalmology (S.K.W., D.R.-B., D.J.W., R.R.S., Y.Z., E.K., P.J.F., K.B., A.P.K., P.J.P., J.S.R., A.K.D., A.P., P.A.K.), London, United Kingdom; Biomedical Engineering Department (D.R.-B., E.K., U.A., M.B.), Faculty of Engineering (MU-ENG), Mondragon Unibertsitatea, Spain; Great Ormond Street Institute of Child Health (M.C.-B., J.S.R.), and Centre for Medical Image Computing (D.J.W., R.R.S., Y.Z.), Department of Computer Science, University College London; NeuroMetrology Lab (S.P., C.A.A.), Nuffield Department of Clinical Neurosciences, University of Oxford; Dementia Research Centre (R.S.W.), University College London, United Kingdom; Department of Molecular Medicine (E.J.T.), Scripps Research, La Jolla, CA; Byers Eye Institute (E.K.), Stanford University, Palo Alto, CA; Biocruces Bizkaia Health Research Institute (I.G.), Barakaldo; IKERBASQUE: The Basque Foundation for Science (I.G.), Bilbao, Spain; Department of Clinical and Movement Neurosciences (A.H.V.S.), UCL Queen Square Institute of Neurology; Great Ormond Street Hospital NHS Foundation Trust (J.S.R.); Ulverscroft Vision Research Group (J.S.R.), University College London; NIHR Biomedical Research Centre at UCL Great Ormond Street Institute of Child Health and Great Ormond Street Hospital (J.S.R.), London; University of Birmingham (A.K.D.); University Hospitals Birmingham NHS Foundation Trust (A.K.D.); NIHR Birmingham Biomedical Research Centre (A.K.D.), University of Birmingham; and Queen Square Institute of Neurology (A.P.), University College London, United Kingdom
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16
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Lee YW, Lim MN, Lee JY, Yoo YJ. Central retina thickness measured with spectral-domain optical coherence tomography in Parkinson disease: A meta-analysis. Medicine (Baltimore) 2023; 102:e35354. [PMID: 37800768 PMCID: PMC10553016 DOI: 10.1097/md.0000000000035354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Accepted: 09/01/2023] [Indexed: 10/07/2023] Open
Abstract
BACKGROUND Optical coherence tomography (OCT) can detect visual alterations associated with Parkinson disease, such as damage to the retinal nerve fiber layer or changes in retinal vasculature. Macula thinning in association with Parkinson disease (PD) remains controversial. Therefore, we conducted a meta-analysis to investigate the central retina thickness in PD measured using spectral-domain OCT (SD-OCT). METHODS We searched PubMed and the Excerpta Medica database to identify studies that compared macular thickness between patients with PD and healthy controls published before July 31, 2021. A random-effects model was used to examine PD-associated changes in macular thickness. Meta-regression analysis was performed by assessing heterogeneity, publication bias, and study quality. RESULTS Thirty-two studies with a cross-sectional design were selected, including 2118 patients with PD and 2338 controls. We identified significant differences in the thickness of the ganglion cell-inner plexiform layer (standardized mean difference [SMD], -0.41; 95% confidence interval [CI], -0.66 to -0.16; I2 = 80%), ganglion cell complex (SMD, -0.33; 95% CI, -0.50 to -0.17; I2 = 0%), and of all inner and outer sectors of the macula (SMD range, -0.21 to -0.56; all P < .05) between patients with PD and controls. DISCUSSION These results corroborate the increased prevalence of changes in OCT measures in individuals with PD, highlighting the efficacy of SD-OCT-determined macular thickness as a biomarker for PD. Our findings may provide helpful guidelines for clinicians in rapidly evolving areas of PD diagnosis.
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Affiliation(s)
- Yong Woo Lee
- Department of Ophthalmology, Kangwon National University School of Medicine, Chuncheon, Korea
- Department of Ophthalmology, Kangwon National University Hospital, Chuncheon, Korea
| | - Myung-Nam Lim
- Biomedical Research Institute, Kangwon National University School of Medicine, Chuncheon, Korea
| | - Jae Yeon Lee
- Department of Ophthalmology, Kangwon National University School of Medicine, Chuncheon, Korea
| | - Yung-Ju Yoo
- Department of Ophthalmology, Kangwon National University School of Medicine, Chuncheon, Korea
- Department of Ophthalmology, Kangwon National University Hospital, Chuncheon, Korea
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17
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Polat OA, Gultekin M, Sener H, Ozer F, Arda H. Retinal dysfunction in Parkinson's disease-results of the extended protocol for photopic negative response (PHNR) full-field electroretinogram (ERG). Doc Ophthalmol 2023; 147:89-98. [PMID: 37515709 DOI: 10.1007/s10633-023-09945-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Accepted: 07/06/2023] [Indexed: 07/31/2023]
Abstract
BACKGROUND We investigated whether the photopic negative response (PhNR) in the electroretinogram (ERG) was affected in Parkinson's disease (PD) patients and whether it was associated with retinal changes on optical coherence tomography (OCT). METHODS Thirty-two patients with PD and 31 age and sex-matched healthy controls from a single tertiary centre were included in the study. Hoehn and Yahr scale scores and the presence of REM sleep behaviour were recorded. PhNR, a-wave and b-wave responses in photopic ERG (red on blue background) and retinal layer thicknesses in OCT were obtained. RESULTS The mean age was 61 ± 10.4 in the PD group (female/male: 18/14) and 60.9 ± 7 in the control group (female/male: 18/13). The amplitudes of the PhNR, a- and b-waves in the ERG were significantly decreased in the PD group, but the implicit times were not significantly different. BCVA was significantly correlated with Hoehn and Yahr scores (p < 0.001, r = - 0.596). There was a significant correlation between BCVA and a-wave amplitude (p = 0.047, r = - 0.251). On OCT analysis, the thickness of the nasal INL was increased, and the temporal and inferior OPL and temporal peripapillary RNFL were decreased in the PD group compared to healthy controls (p = 0.032, p = 0.002, p = 0.016 and p = 0.012, respectively). CONCLUSION This study demonstrated reduced a-wave, b-wave and PhNR-wave amplitudes on ERG measurements in PD patients. These findings suggest that the whole ERG response, not just the PhNR, is attenuated in patient with PD, suggesting a possible involvement of the visual system in the disease.
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Affiliation(s)
- Osman Ahmet Polat
- Department of Ophthalmology, Erciyes University Medical Faculty, Kayseri, Turkey.
| | - Murat Gultekin
- Department of Neurology, Erciyes University Medical Faculty, Kayseri, Turkey
| | - Hidayet Sener
- Department of Ophthalmology, Erciyes University Medical Faculty, Kayseri, Turkey
| | - Furkan Ozer
- Department of Ophthalmology, Erciyes University Medical Faculty, Kayseri, Turkey
| | - Hatice Arda
- Department of Ophthalmology, Erciyes University Medical Faculty, Kayseri, Turkey
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18
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Wang F, Zhong W, Yang Q, Zhao W, Liu X, Rao B, Lin X, Zhang J. Distribution and synaptic organization of substance P-like immunoreactive neurons in the mouse retina. Brain Struct Funct 2023; 228:1703-1724. [PMID: 37481742 DOI: 10.1007/s00429-023-02688-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 07/12/2023] [Indexed: 07/25/2023]
Abstract
Substance P (SP), a neuroprotective peptidergic neurotransmitter, is known to have immunoreactivity (IR) localized to amacrine and/or ganglion cells in a variety of species' retinas, but it has not yet been studied in the mouse retina. Thus, we investigated the distribution and synaptic organization of SP-IR by confocal and electron microscopy immunocytochemistry in the mouse retina. SP-IR was distributed in the inner nuclear layer (INL), inner plexiform layer (IPL), and ganglion cell layer (GCL). Most of the SP-IR somas belonged to amacrine cells (2.5% of all) in the INL and their processes stratified into the S1, S3, and S5 layers of the IPL, with the most intense band in the S5 layer. Some SP-IR somas can also be observed in the GCL, which were identified as displaced amacrine cells (82%, 1269/1550) and ganglion cells (18%, 281/1550) by antibodies against AP2α and RBPMS, respectively. Such SP-IR ganglion cells (1.2% of all RGCs) can be further divided into 3 subgroups expressing SP/α-Synuclein (α-Syn), SP/GAD67, and/or SP/GAD67/α-Syn. Possible physiological and pathological roles of these ganglion cells are discussed. Further, electron microscopy evidence demonstrates that SP-IR amacrine cells receive major inputs from other SP-IR amacrine cell processes (146/242 inputs) and output mostly to SP-negative amacrine cell processes (291/673 outputs), suggesting series inhibition among amacrine cells. These results reveal for the first time an explicit distribution, novel ganglion cell features, and synaptic organization of SP-IR in the mouse retina, which is important for the future use of mouse models to study the roles of SP in healthy and diseased (including Parkinson's disease) retinal states.
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Affiliation(s)
- Fenglan Wang
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Wenhui Zhong
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Qingwen Yang
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Wenna Zhao
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Xiaoqing Liu
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
| | - Bilin Rao
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
- Laboratory of Retinal Physiology and Disease, School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, 325027, Zhejiang, China
| | - Xin Lin
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China
- Laboratory of Retinal Physiology and Disease, School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, 325027, Zhejiang, China
| | - Jun Zhang
- State Key Laboratory of Ophthalmology, Optometry and Visual Science, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China.
- Laboratory of Retinal Physiology and Disease, School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, 325027, Zhejiang, China.
- National Clinical Research Center for Ocular Diseases, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China.
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19
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Hart de Ruyter FJ, Morrema THJ, den Haan J, Gase G, Twisk JWR, de Boer JF, Scheltens P, Bouwman FH, Verbraak FD, Rozemuller AJM, Hoozemans JJM. α-Synuclein pathology in post-mortem retina and optic nerve is specific for α-synucleinopathies. NPJ Parkinsons Dis 2023; 9:124. [PMID: 37640753 PMCID: PMC10462645 DOI: 10.1038/s41531-023-00570-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 08/16/2023] [Indexed: 08/31/2023] Open
Abstract
There is increasing interest in studying retinal biomarkers for various neurodegenerative diseases. Specific protein aggregates associated with neurodegenerative diseases are present in the retina and could be visualised in a non-invasive way. This study aims to assess the specificity and sensitivity of retinal α-synuclein aggregates in neuropathologically characterised α-synucleinopathies, other neurodegenerative diseases and non-neurological controls. Post-mortem eyes (N = 99) were collected prospectively through the Netherlands Brain Bank from donors with Parkinson's disease (and dementia), dementia with Lewy bodies, multiple system atrophy, Alzheimer's disease, other neurodegenerative diseases and non-neurological controls. Multiple retinal and optic nerve cross-sections were immunostained with anti-α-synuclein antibodies (LB509, KM51, and anti-pSer129) and assessed for aggregates and inclusions. α-Synuclein was observed as Lewy neurites in the retina and oligodendroglial cytoplasmic inclusions in the optic nerve and was highly associated with Lewy body disease (P < 0.001) and multiple system atrophy (P = 0.001). In all multiple system atrophy cases, the optic nerve showed oligodendroglial cytoplasmic inclusions, while retinal Lewy neurites were absent, despite coincidental brain Lewy pathology. With high specificity (97%) and sensitivity (82%), retinal/optic nerve α-synuclein differentiates primary α-synucleinopathies from other cases and controls. α-Synuclein pathology occurs specifically in the retina and optic nerve of primary α-synucleinopathies as opposed to other neurodegenerative diseases-with and without α-synuclein co-pathology-and controls. The absence of retinal Lewy neurites in multiple system atrophy could contribute to the development of an in vivo retinal biomarker that discriminates between Lewy body disease and multiple system atrophy.
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Affiliation(s)
- Frederique J Hart de Ruyter
- Department of Pathology, Amsterdam UMC location Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
- Department of Neurology and Alzheimer Center Amsterdam, Amsterdam UMC location Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
| | - Tjado H J Morrema
- Department of Pathology, Amsterdam UMC location Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
| | - Jurre den Haan
- Department of Neurology and Alzheimer Center Amsterdam, Amsterdam UMC location Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
| | - Gina Gase
- Department of Pathology, Amsterdam UMC location Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
| | - Jos W R Twisk
- Department of Epidemiology and Data Science, Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
| | - Johannes F de Boer
- Department of Physics and Astronomy and LaserLaB, Vrije Universiteit Amsterdam, De Boelelaan 1081, Amsterdam, The Netherlands
| | - Philip Scheltens
- Department of Neurology and Alzheimer Center Amsterdam, Amsterdam UMC location Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
| | - Femke H Bouwman
- Department of Neurology and Alzheimer Center Amsterdam, Amsterdam UMC location Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
| | - Frank D Verbraak
- Department of Ophthalmology, Amsterdam UMC location Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
| | - Annemieke J M Rozemuller
- Department of Pathology, Amsterdam UMC location Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands
| | - Jeroen J M Hoozemans
- Department of Pathology, Amsterdam UMC location Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, The Netherlands.
- Amsterdam Neuroscience, Neurodegeneration, Amsterdam, The Netherlands.
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20
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Tu M, Yang S, Zeng L, Tan Y, Wang X. Retinal Vessel Density and Retinal Nerve Fiber Layer Thickness: A Prospective Study of One-Year Follow-Up of Patients with Parkinson's Disease. Int J Gen Med 2023; 16:3701-3712. [PMID: 37637710 PMCID: PMC10460207 DOI: 10.2147/ijgm.s426501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 08/14/2023] [Indexed: 08/29/2023] Open
Abstract
Objective This study aims to compare the superficial vascular density from the macular region and the retinal nerve fiber layer (RNFL) thickness from the optic disc region between Parkinson's disease (PD) patients and controls. Methods We enrolled 56 idiopathic PD patients, totaling 86 eyes (PD group), and 45 sex- and age-matched healthy individuals, amounting to 90 eyes (control group). All subjects underwent examination using Zeiss wide-field vascular optical coherence tomography (OCT) (Cirrus HD-OCT 5000 Carl Zeiss, Germany), with a scanning range of 3 mm × 3 mm. We divided the images into two concentric circles with diameters of 1 mm and 3 mm at the macular fovea's center. Patients with PD were evaluated during their "off" phase using the Unified Parkinson's Disease Rating Scale III (UPDRS-III) and the Hoehn-Yahr scale (H-Y scale) to assess disease severity. Results The PD group exhibited significantly lower RNFL thickness (106.13±12.36 μm) compared to the control group (115.95±11.37 μm, P < 0.05). Similarly, the superficial retinal vessel length density was significantly lower in the PD group (20.7 [19.62, 22.17] mm-1) than in the control group (21.79±1.16 mm-1, P < 0.05). Correlation analysis revealed a negative correlation between RNFL thickness and UPDRS III score (rs=-0.036, P=0.037), and RNFL thickness tended to decrease with increasing severity of movement disorders. However, during the 6 and 12-month follow-up of some PD patients, we observed no progressive thinning of the RNFL or decreased superficial vascular density. Conclusion PD patients show retinal structural damage characterized by RNFL thinning and reduced retinal vessel length density. However, RNFL thickness did not correlate with vascular density nor did it decrease with the disease's progression.
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Affiliation(s)
- Min Tu
- People’s Hospital of Deyang City, Department of Neurology, Deyang, People’s Republic of China
- Affiliated Hospital of North Sichuan Medical College, Department of Neurology, Nanchong, People’s Republic of China
| | - Shuangfeng Yang
- People’s Hospital of Yuechi County, Department of Neurology, Guangan, People’s Republic of China
| | - Lan Zeng
- Affiliated Hospital of North Sichuan Medical College, Department of Neurology, Nanchong, People’s Republic of China
| | - Yuling Tan
- Affiliated Hospital of North Sichuan Medical College, Department of Neurology, Nanchong, People’s Republic of China
| | - Xiaoming Wang
- Affiliated Hospital of North Sichuan Medical College, Department of Neurology, Nanchong, People’s Republic of China
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21
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Nieto-Escamez F, Obrero-Gaitán E, Cortés-Pérez I. Visual Dysfunction in Parkinson's Disease. Brain Sci 2023; 13:1173. [PMID: 37626529 PMCID: PMC10452537 DOI: 10.3390/brainsci13081173] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 07/11/2023] [Accepted: 08/03/2023] [Indexed: 08/27/2023] Open
Abstract
Non-motor symptoms in Parkinson's disease (PD) include ocular, visuoperceptive, and visuospatial impairments, which can occur as a result of the underlying neurodegenerative process. Ocular impairments can affect various aspects of vision and eye movement. Thus, patients can show dry eyes, blepharospasm, reduced blink rate, saccadic eye movement abnormalities, smooth pursuit deficits, and impaired voluntary and reflexive eye movements. Furthermore, visuoperceptive impairments affect the ability to perceive and recognize visual stimuli accurately, including impaired contrast sensitivity and reduced visual acuity, color discrimination, and object recognition. Visuospatial impairments are also remarkable, including difficulties perceiving and interpreting spatial relationships between objects and difficulties judging distances or navigating through the environment. Moreover, PD patients can present visuospatial attention problems, with difficulties attending to visual stimuli in a spatially organized manner. Moreover, PD patients also show perceptual disturbances affecting their ability to interpret and determine meaning from visual stimuli. And, for instance, visual hallucinations are common in PD patients. Nevertheless, the neurobiological bases of visual-related disorders in PD are complex and not fully understood. This review intends to provide a comprehensive description of visual disturbances in PD, from sensory to perceptual alterations, addressing their neuroanatomical, functional, and neurochemical correlates. Structural changes, particularly in posterior cortical regions, are described, as well as functional alterations, both in cortical and subcortical regions, which are shown in relation to specific neuropsychological results. Similarly, although the involvement of different neurotransmitter systems is controversial, data about neurochemical alterations related to visual impairments are presented, especially dopaminergic, cholinergic, and serotoninergic systems.
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Affiliation(s)
- Francisco Nieto-Escamez
- Department of Psychology, University of Almeria, 04120 Almeria, Spain
- Center for Neuropsychological Assessment and Rehabilitation (CERNEP), 04120 Almeria, Spain
| | - Esteban Obrero-Gaitán
- Department of Health Sciences, University of Jaen, Paraje Las Lagunillas s/n, 23071 Jaen, Spain;
| | - Irene Cortés-Pérez
- Department of Health Sciences, University of Jaen, Paraje Las Lagunillas s/n, 23071 Jaen, Spain;
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22
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Maran JJ, Adesina MM, Green CR, Kwakowsky A, Mugisho OO. The central role of the NLRP3 inflammasome pathway in the pathogenesis of age-related diseases in the eye and the brain. Ageing Res Rev 2023; 88:101954. [PMID: 37187367 DOI: 10.1016/j.arr.2023.101954] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 05/08/2023] [Accepted: 05/12/2023] [Indexed: 05/17/2023]
Abstract
With increasing age, structural changes occur in the eye and brain. Neuronal death, inflammation, vascular disruption, and microglial activation are among many of the pathological changes that can occur during ageing. Furthermore, ageing individuals are at increased risk of developing neurodegenerative diseases in these organs, including Alzheimer's disease (AD), Parkinson's disease (PD), glaucoma and age-related macular degeneration (AMD). Although these diseases pose a significant global public health burden, current treatment options focus on slowing disease progression and symptomatic control rather than targeting underlying causes. Interestingly, recent investigations have proposed an analogous aetiology between age-related diseases in the eye and brain, where a process of chronic low-grade inflammation is implicated. Studies have suggested that patients with AD or PD are also associated with an increased risk of AMD, glaucoma, and cataracts. Moreover, pathognomonic amyloid-β and α-synuclein aggregates, which accumulate in AD and PD, respectively, can be found in ocular parenchyma. In terms of a common molecular pathway that underpins these diseases, the nucleotide-binding domain, leucine-rich-containing family, and pyrin domain-containing-3 (NLRP3) inflammasome is thought to play a vital role in the manifestation of all these diseases. This review summarises the current evidence regarding cellular and molecular changes in the brain and eye with age, similarities between ocular and cerebral age-related diseases, and the role of the NLRP3 inflammasome as a critical mediator of disease propagation in the eye and the brain during ageing.
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Affiliation(s)
- Jack J Maran
- Buchanan Ocular Therapeutics Unit, Department of Ophthalmology and the New Zealand National Eye Centre, University of Auckland, New Zealand
| | - Moradeke M Adesina
- Buchanan Ocular Therapeutics Unit, Department of Ophthalmology and the New Zealand National Eye Centre, University of Auckland, New Zealand
| | - Colin R Green
- Department of Ophthalmology and the New Zealand National Eye Centre, Faculty of Medical and Health Sciences, University of Auckland, New Zealand
| | - Andrea Kwakowsky
- Pharmacology and Therapeutics, School of Medicine, Galway Neuroscience Centre, University of Galway, Galway, Ireland
| | - Odunayo O Mugisho
- Buchanan Ocular Therapeutics Unit, Department of Ophthalmology and the New Zealand National Eye Centre, University of Auckland, New Zealand.
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23
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Pérez-Acuña D, Rhee KH, Shin SJ, Ahn J, Lee JY, Lee SJ. Retina-to-brain spreading of α-synuclein after intravitreal injection of preformed fibrils. Acta Neuropathol Commun 2023; 11:83. [PMID: 37210559 PMCID: PMC10199563 DOI: 10.1186/s40478-023-01575-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 04/30/2023] [Indexed: 05/22/2023] Open
Abstract
Parkinson's disease (PD) is a neurodegenerative disorder characterized by the aggregation of misfolded α-synuclein and progressive spreading of the aggregates from a few discrete regions to wider brain regions. Although PD has been classically considered a movement disorder, a large body of clinical evidence has revealed the progressive occurrence of non-motor symptoms. Patients present visual symptoms in the initial stages of the disease, and accumulation of phospho-α-synuclein, dopaminergic neuronal loss, and retinal thinning has been observed in the retinas of PD patients. Based on such human data, we hypothesized that α-synuclein aggregation can initiate in the retina and spread to the brain through the visual pathway. Here, we demonstrate accumulation of α-synuclein in the retinas and brains of naive mice after intravitreal injection of α-synuclein preformed fibrils (PFFs). Histological analyses showed deposition of phospho-α-synuclein inclusions within the retina 2 months after injection, with increased oxidative stress leading to loss of retinal ganglion cells and dopaminergic dysfunction. In addition, we found accumulation of phospho-α-synuclein in cortical areas with accompanying neuroinflammation after 5 months. Collectively, our findings suggest that retinal synucleinopathy lesions initiated by intravitreal injection of α-synuclein PFFs spread to various brain regions through the visual pathway in mice.
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Affiliation(s)
- Dayana Pérez-Acuña
- Department of Biomedical Sciences, Seoul National University College of Medicine, 103 Daehak-Ro, Jongro-Gu, Seoul, 03080, Korea
| | - Ka Hyun Rhee
- Department of Biomedical Sciences, Seoul National University College of Medicine, 103 Daehak-Ro, Jongro-Gu, Seoul, 03080, Korea
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Soo Jean Shin
- Department of Biomedical Sciences, Seoul National University College of Medicine, 103 Daehak-Ro, Jongro-Gu, Seoul, 03080, Korea
| | - Jeeyun Ahn
- Department of Ophthalmology, College of Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul National University, Seoul, South Korea
| | - Jee-Young Lee
- Department of Neurology, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul National University College of Medicine, Seoul, South Korea
| | - Seung-Jae Lee
- Department of Biomedical Sciences, Seoul National University College of Medicine, 103 Daehak-Ro, Jongro-Gu, Seoul, 03080, Korea.
- Neuroscience Research Institute, Seoul National University College of Medicine, Seoul, South Korea.
- Convergence Research Center for Dementia, Seoul National University College of Medicine, Seoul, South Korea.
- Neuramedy, Seoul, South Korea.
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24
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Maran JJ, Adesina MM, Green CR, Kwakowsky A, Mugisho OO. Retinal inner nuclear layer thickness in the diagnosis of cognitive impairment explored using a C57BL/6J mouse model. Sci Rep 2023; 13:8150. [PMID: 37208533 DOI: 10.1038/s41598-023-35229-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 05/15/2023] [Indexed: 05/21/2023] Open
Abstract
Major neurocognitive disorder (NCD) affects over 55 million people worldwide and is characterized by cognitive impairment (CI). This study aimed to develop a non-invasive diagnostic test for CI based upon retinal thickness measurements explored in a mouse model. Discrimination indices and retinal layer thickness of healthy C57BL/6J mice were quantified through a novel object recognition test (NORT) and ocular coherence tomography (OCT), respectively. Based on criteria from the Diagnostic and statistical manual of mental disorders 5th ed. (DSM-V), a diagnostic test was generated by transforming data into rolling monthly averages and categorizing mice into those with and without CI and those with a high or low decline in retinal layer thickness. Only inner nuclear layer thickness had a statistically significant relationship with discrimination indices. Furthermore, our diagnostic test was 85.71% sensitive and 100% specific for diagnosing CI, with a positive predictive value of 100%. These findings have potential clinical implications for the early diagnosis of CI in NCD. However, further investigation in comorbid mice and humans is warranted.
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Affiliation(s)
- Jack J Maran
- Buchanan Ocular Therapeutics Unit, Department of Ophthalmology and The New Zealand National Eye Centre, University of Auckland, Auckland, New Zealand
| | - Moradeke M Adesina
- Department of Ophthalmology and The New Zealand National Eye Centre, Faculty of Medical and Health Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Colin R Green
- Department of Ophthalmology and The New Zealand National Eye Centre, Faculty of Medical and Health Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Andrea Kwakowsky
- Centre for Brain Research, University of Auckland, Auckland, New Zealand
- Department of Anatomy and Medical Imaging, University of Auckland, Auckland, New Zealand
- Pharmacology and Therapeutics, School of Medicine, Galway Neuroscience Centre, University of Galway, Galway, Ireland
| | - Odunayo O Mugisho
- Buchanan Ocular Therapeutics Unit, Department of Ophthalmology and The New Zealand National Eye Centre, University of Auckland, Auckland, New Zealand.
- Department of Ophthalmology and The New Zealand National Eye Centre, Faculty of Medical and Health Sciences, University of Auckland, Private Bag 92019, Auckland, New Zealand.
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25
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Tran KKN, Wong VHY, Hoang A, Finkelstein DI, Bui BV, Nguyen CTO. Retinal alpha-synuclein accumulation correlates with retinal dysfunction and structural thinning in the A53T mouse model of Parkinson's disease. Front Neurosci 2023; 17:1146979. [PMID: 37214398 PMCID: PMC10196133 DOI: 10.3389/fnins.2023.1146979] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Accepted: 04/17/2023] [Indexed: 05/24/2023] Open
Abstract
Abnormal alpha-synuclein (α-SYN) protein deposition has long been recognized as one of the pathological hallmarks of Parkinson's disease's (PD). This study considers the potential utility of PD retinal biomarkers by investigating retinal changes in a well characterized PD model of α-SYN overexpression and how these correspond to the presence of retinal α-SYN. Transgenic A53T homozygous (HOM) mice overexpressing human α-SYN and wildtype (WT) control littermates were assessed at 4, 6, and 14 months of age (male and female, n = 15-29 per group). In vivo retinal function (electroretinography, ERG) and structure (optical coherence tomography, OCT) were recorded, and retinal immunohistochemistry and western blot assays were performed to examine retinal α-SYN and tyrosine hydroxylase. Compared to WT controls, A53T mice exhibited reduced light-adapted (cone photoreceptor and bipolar cell amplitude, p < 0.0001) ERG responses and outer retinal thinning (outer plexiform layer, outer nuclear layer, p < 0.0001) which correlated with elevated levels of α-SYN. These retinal signatures provide a high throughput means to study α-SYN induced neurodegeneration and may be useful in vivo endpoints for PD drug discovery.
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Affiliation(s)
- Katie K. N. Tran
- Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, VIC, Australia
| | - Vickie H. Y. Wong
- Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, VIC, Australia
| | - Anh Hoang
- Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, VIC, Australia
| | - David I. Finkelstein
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, VIC, Australia
| | - Bang V. Bui
- Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, VIC, Australia
| | - Christine T. O. Nguyen
- Department of Optometry and Vision Sciences, The University of Melbourne, Parkville, VIC, Australia
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26
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Sánchez-Sáez X, Ortuño-Lizarán I, Sánchez-Castillo C, Lax P, Cuenca N. Starburst amacrine cells, involved in visual motion perception, loose their synaptic input from dopaminergic amacrine cells and degenerate in Parkinson's disease patients. Transl Neurodegener 2023; 12:17. [PMID: 37013599 PMCID: PMC10071607 DOI: 10.1186/s40035-023-00348-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 03/10/2023] [Indexed: 04/05/2023] Open
Abstract
BACKGROUND The main clinical symptoms characteristic of Parkinson's disease (PD) are bradykinesia, tremor, and other motor deficits. However, non-motor symptoms, such as visual disturbances, can be identified at early stages of the disease. One of these symptoms is the impairment of visual motion perception. Hence, we sought to determine if the starburst amacrine cells, which are the main cellular type involved in motion direction selectivity, are degenerated in PD and if the dopaminergic system is related to this degeneration. METHODS Human eyes from control (n = 10) and PD (n = 9) donors were available for this study. Using immunohistochemistry and confocal microscopy, we quantified starburst amacrine cell density (choline acetyltransferase [ChAT]-positive cells) and the relationship between these cells and dopaminergic amacrine cells (tyrosine hydroxylase-positive cells and vesicular monoamine transporter-2-positive presynapses) in cross-sections and wholemount retinas. RESULTS First, we found two different ChAT amacrine populations in the human retina that presented different ChAT immunoreactivity intensity and different expression of calcium-binding proteins. Both populations are affected in PD and their density is reduced compared to controls. Also, we report, for the first time, synaptic contacts between dopaminergic amacrine cells and ChAT-positive cells in the human retina. We found that, in PD retinas, there is a reduction of the dopaminergic synaptic contacts into ChAT cells. CONCLUSIONS Taken together, this work indicates degeneration of starburst amacrine cells in PD related to dopaminergic degeneration and that dopaminergic amacrine cells could modulate the function of starburst amacrine cells. Since motion perception circuitries are affected in PD, their assessment using visual tests could provide new insights into the diagnosis of PD.
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Grants
- FEDER-PID 2019-106230RB-I00 Ministerio de Ciencia e Innovación
- FEDER-PID 2019-106230RB-I00 Ministerio de Ciencia e Innovación
- FPU16/04114 Ministerio de Universidades
- RETICS-FEDER RD16/0008/0016 Instituto de Salud Carlos III
- IDIFEDER/2017/064 Conselleria de Innovación, Universidades, Ciencia y Sociedad Digital, Generalitat Valenciana
- PROMETEO/2021/024 Conselleria de Innovación, Universidades, Ciencia y Sociedad Digital, Generalitat Valenciana
- PROMETEO/2021/024 Conselleria de Innovación, Universidades, Ciencia y Sociedad Digital, Generalitat Valenciana
- APOSTD/2020/245 Conselleria de Innovación, Universidades, Ciencia y Sociedad Digital, Generalitat Valenciana
- 2019/00286/001 Es Retina Asturias
- 2019/00286/001 Es Retina Asturias
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Affiliation(s)
- Xavier Sánchez-Sáez
- Department of Physiology, Genetics and Microbiology, University of Alicante, San Vicente del Raspeig, Spain
| | - Isabel Ortuño-Lizarán
- Department of Physiology, Genetics and Microbiology, University of Alicante, San Vicente del Raspeig, Spain
| | - Carla Sánchez-Castillo
- Department of Physiology, Genetics and Microbiology, University of Alicante, San Vicente del Raspeig, Spain
| | - Pedro Lax
- Department of Physiology, Genetics and Microbiology, University of Alicante, San Vicente del Raspeig, Spain
- Alicante Institute for Health and Biomedical Research (ISABIAL), Alicante, Spain
| | - Nicolás Cuenca
- Department of Physiology, Genetics and Microbiology, University of Alicante, San Vicente del Raspeig, Spain.
- Alicante Institute for Health and Biomedical Research (ISABIAL), Alicante, Spain.
- Ramón Margalef Institute, University of Alicante, San Vicente del Raspeig, Spain.
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27
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Yang Q, Lin X, Xiao J, Zhong W, Wang F, Tan H, Rao B, Qu J, Zhang J. Expression of α‐Synuclein in the mouse retina is confined to inhibitory presynaptic elements. J Comp Neurol 2023; 531:1057-1079. [PMID: 37002599 DOI: 10.1002/cne.25481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 01/18/2023] [Accepted: 03/13/2023] [Indexed: 04/03/2023]
Abstract
α-Synuclein (α-Syn) is enriched in presynaptic terminals of the central nervous system including the retina and plays a role in the synaptic vesicle cycle and synaptic transmission. Abnormal aggregation of α-Syn is considered to be the main component of the Lewy bodies that are the pathological hallmarks of Parkinson's disease. Although expression pattern of α-Syn has been described in the retinas, its precise cellular and subcellular locations are poorly understood. We investigated the precise expression of α-Syn using light microscopy (LM) and electron microscopy (EM) with antibodies against α-Syn in the mouse retina. We found that the majority of α-Syn immunoreactivity (IR) is located in GABAergic, glycinergic, and dopaminergic amacrine cells, and their processes often make a direct synapse to other labeled or unlabeled amacrine profiles, bipolar cell terminals, or ganglion cell dendrites. Further, our LM and immuno-EM results confirm the absence of α-Syn in excitatory photoreceptors, bipolar cell bodies, and their ribbon synapses, providing evidence, for the first time, that ribbon synapses do not express α-Syn. Additionally, α-Syn IR is located in the ganglion cells, some of which are intrinsically photosensitive retinal ganglion cells. These results reveal a previously unappreciated inhibitory synapse-specific expression pattern of α-Syn in the retina, suggesting that α-Syn may play a distinct role in the modulation and integration of inhibitory synaptic transmission in the retina.
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Affiliation(s)
- Qingwen Yang
- Laboratory of Retinal Physiology and Disease School of Ophthalmology and Optometry and Eye Hospital Wenzhou Medical University Wenzhou China
| | - Xin Lin
- Laboratory of Retinal Physiology and Disease School of Ophthalmology and Optometry and Eye Hospital Wenzhou Medical University Wenzhou China
| | - Jiayi Xiao
- Laboratory of Retinal Physiology and Disease School of Ophthalmology and Optometry and Eye Hospital Wenzhou Medical University Wenzhou China
| | - Wenhui Zhong
- Laboratory of Retinal Physiology and Disease School of Ophthalmology and Optometry and Eye Hospital Wenzhou Medical University Wenzhou China
| | - Fenglan Wang
- Laboratory of Retinal Physiology and Disease School of Ophthalmology and Optometry and Eye Hospital Wenzhou Medical University Wenzhou China
| | - Hang Tan
- Laboratory of Retinal Physiology and Disease School of Ophthalmology and Optometry and Eye Hospital Wenzhou Medical University Wenzhou China
| | - Bilin Rao
- Laboratory of Retinal Physiology and Disease School of Ophthalmology and Optometry and Eye Hospital Wenzhou Medical University Wenzhou China
| | - Jia Qu
- State Key Laboratory of Ophthalmology Optometry and Vision Science, Eye Hospital, Wenzhou Medical University Wenzhou China
- National Clinical Research Center for Ocular Diseases Eye Hospital Wenzhou Medical University Wenzhou China
| | - Jun Zhang
- Laboratory of Retinal Physiology and Disease School of Ophthalmology and Optometry and Eye Hospital Wenzhou Medical University Wenzhou China
- State Key Laboratory of Ophthalmology Optometry and Vision Science, Eye Hospital, Wenzhou Medical University Wenzhou China
- National Clinical Research Center for Ocular Diseases Eye Hospital Wenzhou Medical University Wenzhou China
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28
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The Role of Alpha-Synuclein Deposits in Parkinson's Disease: A Focus on the Human Retina. Int J Mol Sci 2023; 24:ijms24054391. [PMID: 36901822 PMCID: PMC10002434 DOI: 10.3390/ijms24054391] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 02/16/2023] [Accepted: 02/21/2023] [Indexed: 02/25/2023] Open
Abstract
Parkinson's disease (PD) is a neurodegenerative condition characterized by the progressive deterioration of dopaminergic neurons in the central and peripheral autonomous system and the intraneuronal cytoplasmic accumulation of misfolded α-synuclein. The clinical features are the classic triad of tremor, rigidity, and bradykinesia and a set of non-motor symptoms, including visual deficits. The latter seems to arise years before the onset of motor symptoms and reflects the course of brain disease. The retina, by virtue of its similarity to brain tissue, is an excellent site for the analysis of the known histopathological changes of PD that occur in the brain. Numerous studies conducted on animal and human models of PD have shown the presence of α-synuclein in retinal tissue. Spectral-domain optical coherence tomography (SD-OCT) could be a technique that enables the study of these retinal alterations in vivo. The objective of this review is to describe recent evidence on the accumulation of native or modified α-synuclein in the human retina of patients with PD and its effects on the retinal tissue evaluated through SD-OCT.
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29
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Alves JN, Westner BU, Højlund A, Weil RS, Dalal SS. Structural and functional changes in the retina in Parkinson's disease. J Neurol Neurosurg Psychiatry 2023; 94:448-456. [PMID: 36806480 PMCID: PMC7614544 DOI: 10.1136/jnnp-2022-329342] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 01/05/2023] [Indexed: 02/19/2023]
Abstract
Parkinson's disease is caused by degeneration of dopaminergic neurons, originating in the substantia nigra pars compacta and characterised by bradykinesia, rest tremor and rigidity. In addition, visual disorders and retinal abnormalities are often present and can be identified by decreased visual acuity, abnormal spatial contrast sensitivity or even difficulty in complex visual task completion. Because of their early onset in patients with de novo Parkinson's disease, the anatomical retinal changes and electrophysiological modification could be valuable markers even at early stages of the disease. However, due to the concomitant occurrence of normal ageing, the relevance and specificity of these predictive values can be difficult to interpret. This review examines retinal dysfunction arising in Parkinson's disease. We highlight the electrophysiological delays and decreased amplitude in the electroretinography recorded in patients and animal models. We relate this to coexisting anatomical changes such as retinal nerve fibre layer and macular thinning, measured using optical coherence tomography, and show that functional measures are more consistent overall than optical coherence-measured structural changes. We review the underlying chemical changes seen with loss of retinal dopaminergic neurons and the effect of levodopa treatment on the retina in Parkinson's disease. Finally, we consider whether retinal abnormalities in Parkinson's disease could have a role as potential markers of poorer outcomes and help stratify patients at early stages of the disease. We emphasise that retinal measures can be valuable, accessible and cost-effective methods in the early evaluation of Parkinson's disease pathogenesis with potential for patient stratification.
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Affiliation(s)
- Jordan N Alves
- Center of Functionally Integrative Neuroscience, Aarhus University, Aarhus, Denmark
| | - Britta U Westner
- Radboud University, Donders Institute for Brain, Cognition and Behaviours, Nijmegen, The Netherlands
| | - Andreas Højlund
- Department of Linguistics, Cognitive Science & Semiotics, Aarhus University, Aarhus, Denmark
| | - Rimona Sharon Weil
- Dementia Research Centre, University College London, London, UK.,Movement Disorders Consortium, University College London, London, UK.,Wellcome Centre for Human Neuroimaging, University College London, London, UK
| | - Sarang S Dalal
- Center of Functionally Integrative Neuroscience, Aarhus University, Aarhus, Denmark
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30
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Vujosevic S, Parra MM, Hartnett ME, O'Toole L, Nuzzi A, Limoli C, Villani E, Nucci P. Optical coherence tomography as retinal imaging biomarker of neuroinflammation/neurodegeneration in systemic disorders in adults and children. Eye (Lond) 2023; 37:203-219. [PMID: 35428871 PMCID: PMC9012155 DOI: 10.1038/s41433-022-02056-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 03/10/2022] [Accepted: 03/31/2022] [Indexed: 01/28/2023] Open
Abstract
The retina and the optic nerve are considered extensions of the central nervous system (CNS) and thus can serve as the window for evaluation of CNS disorders. Spectral domain optical coherence tomography (OCT) allows for detailed evaluation of the retina and the optic nerve. OCT can non-invasively document changes in single retina layer thickness and structure due to neuronal and retinal glial cells (RGC) modifications in systemic and local inflammatory and neurodegenerative diseases. These can include evaluation of retinal nerve fibre layer and ganglion cell complex, hyper-reflective retinal spots (HRS, sign of activated microglial cells in the retina), subfoveal neuroretinal detachment, disorganization of the inner retinal layers (DRIL), thickness and integrity of the outer retinal layers and choroidal thickness. This review paper will report the most recent data on the use of OCT as a non invasive imaging biomarker for evaluation of the most common systemic neuroinflammatory and neurodegenerative/neurocognitive disorders in the adults and in paediatric population. In the adult population the main focus will be on diabetes mellitus, multiple sclerosis, optic neuromyelitis, neuromyelitis optica spectrum disorders, longitudinal extensive transverse myelitis, Alzheimer and Parkinson diseases, Amyotrophic lateral sclerosis, Huntington's disease and schizophrenia. In the paediatric population, demyelinating diseases, lysosomal storage diseases, Nieman Pick type C disease, hypoxic ischaemic encephalopathy, human immunodeficiency virus, leukodystrophies spinocerebellar ataxia will be addressed.
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Affiliation(s)
- Stela Vujosevic
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, Milan, Italy.
- Eye Clinic, IRCCS MultiMedica, Milan, Italy.
| | - M Margarita Parra
- Department of Ophthalmology and Visual Sciences, John A. Moran Eye Center, University of Utah, Salt Lake City, UT, USA
| | - M Elizabeth Hartnett
- Department of Ophthalmology and Visual Sciences, John A. Moran Eye Center, University of Utah, Salt Lake City, UT, USA
| | - Louise O'Toole
- Department of Ophthalmology Mater Private Network, Dublin, Ireland
| | - Alessia Nuzzi
- Eye Clinic, IRCCS MultiMedica, Milan, Italy
- University of Milan, Milan, Italy
| | - Celeste Limoli
- Eye Clinic, IRCCS MultiMedica, Milan, Italy
- University of Milan, Milan, Italy
| | - Edoardo Villani
- Eye Clinic, IRCCS MultiMedica, Milan, Italy
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - Paolo Nucci
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, Milan, Italy
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31
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Narrative Review Concerning the Clinical Spectrum of Ophthalmological Impairments in Parkinson's Disease. Neurol Int 2023; 15:140-161. [PMID: 36810467 PMCID: PMC9944508 DOI: 10.3390/neurolint15010012] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 01/20/2023] [Accepted: 01/23/2023] [Indexed: 01/30/2023] Open
Abstract
Ophthalmic non-motor impairments are common in Parkinson's disease patients, from the onset of the neurodegenerative disease and even prior to the development of motor symptoms. This is a very crucial component of the potential for early detection of this disease, even in its earliest stages. Since the ophthalmological disease is extensive and impacts all extraocular and intraocular components of the optical analyzer, a competent assessment of it would be beneficial for the patients. Because the retina is an extension of the nervous system and has the same embryonic genesis as the central nervous system, it is helpful to investigate the retinal changes in Parkinson's disease in order to hypothesize insights that may also be applicable to the brain. As a consequence, the detection of these symptoms and signs may improve the medical evaluation of PD and predict the illness' prognosis. Another valuable aspect of this pathology is the fact that the ophthalmological damage contributes significantly to the decrease in the quality of life of patients with Parkinson's disease. We provide an overview of the most significant ophthalmologic impairments associated with Parkinson's disease. These results certainly constitute a large number of the prevalent visual impairments experienced by PD patients.
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Retinal Structure Abnormalities in Parkinson's Disease and Atypical Parkinsonism. Biomolecules 2023; 13:biom13020218. [PMID: 36830588 PMCID: PMC9952897 DOI: 10.3390/biom13020218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 01/17/2023] [Accepted: 01/20/2023] [Indexed: 01/25/2023] Open
Abstract
We investigated retinal structure changes in patients with Parkinson's disease (PD), multiple system atrophy (MSA), progressive supranuclear palsy (PSP), and controls, and explored the value of this method in differential diagnosis. Spectral domain optical coherence tomography (SD-OCT) was used to measure peripapillary retinal nerve fiber layer (pRNFL) thickness, and macular thickness and volume. PSP patients showed higher temporal pRNFL thickness than PD and MSA patients. Peripapillary RNFL thickness could be used for discriminating PSP from MSA and PD. PD and MSA patients showed retinal thinning in the foveal center circle and nasal inner sectors compared to controls. Macular thickness and volume could be used for discriminating MSA from PD. There were negative correlations between disease duration and OCT parameters in PD, MSA, and PSP, independent of age, sex ratio, and the side of the eye. PD and atypical parkinsonism correlate with specific patterns of retina alterations. OCT could be a biomarker for differential diagnosis and progression evaluation of parkinsonian syndrome.
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33
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Dias SB, de Lemos L, Sousa L, Bitoque DB, Silva GA, Seabra MC, Tenreiro S. Age-Related Changes of the Synucleins Profile in the Mouse Retina. Biomolecules 2023; 13:biom13010180. [PMID: 36671565 PMCID: PMC9855780 DOI: 10.3390/biom13010180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 12/28/2022] [Accepted: 01/11/2023] [Indexed: 01/18/2023] Open
Abstract
Alpha-synuclein (aSyn) plays a central role in Parkinson's disease (PD) and has been extensively studied in the brain. This protein is part of the synuclein family, which is also composed of beta-synuclein (bSyn) and gamma-synuclein (gSyn). In addition to its neurotoxic role, synucleins have important functions in the nervous system, modulating synaptic transmission. Synucleins are expressed in the retina, but they have been poorly characterized. However, there is evidence that they are important for visual function and that they can play a role in retinal degeneration. This study aimed to profile synucleins in the retina of naturally aged mice and to correlate their patterns with specific retinal cells. With aging, we observed a decrease in the thickness of specific retinal layers, accompanied by an increase in glial reactivity. Moreover, the aSyn levels decreased, whereas bSyn increased with aging. The colocalization of both proteins was decreased in the inner plexiform layer (IPL) of the aged retina. gSyn presented an age-related decrease at the inner nuclear layer but was not significantly changed in the ganglion cell layer. The synaptic marker synaptophysin was shown to be preferentially colocalized with aSyn in the IPL with aging. At the same time, aSyn was found to exist at the presynaptic endings of bipolar cells and was affected by aging. Overall, this study suggests that physiological aging can be responsible for changes in the retinal tissue, implicating functional alterations that could affect synuclein family function.
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Affiliation(s)
- Sarah Batista Dias
- iNOVA4Health, NOVA Medical School|Faculdade de Ciências Médicas, NMS|FCM, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal
| | - Luísa de Lemos
- iNOVA4Health, NOVA Medical School|Faculdade de Ciências Médicas, NMS|FCM, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal
| | - Luís Sousa
- iNOVA4Health, NOVA Medical School|Faculdade de Ciências Médicas, NMS|FCM, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal
| | - Diogo B. Bitoque
- iNOVA4Health, NOVA Medical School|Faculdade de Ciências Médicas, NMS|FCM, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal
| | - Gabriela Araújo Silva
- iNOVA4Health, NOVA Medical School|Faculdade de Ciências Médicas, NMS|FCM, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal
| | - Miguel C. Seabra
- iNOVA4Health, NOVA Medical School|Faculdade de Ciências Médicas, NMS|FCM, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal
- UCL Institute of Ophthalmology, London EC1V 9EL, UK
| | - Sandra Tenreiro
- iNOVA4Health, NOVA Medical School|Faculdade de Ciências Médicas, NMS|FCM, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal
- Correspondence:
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Adulla A, Patel U, Ashok A, Katiyar P, Kaulakis M, Kritikos AE, Pillai S, Lee H, Lindner E, Rhee DJ, Singh N. α-Synuclein modulates fibronectin expression in the trabecular meshwork independent of TGFβ2. Exp Eye Res 2023; 226:109351. [PMID: 36539052 PMCID: PMC10384565 DOI: 10.1016/j.exer.2022.109351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 12/06/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022]
Abstract
α-Synuclein (α-Syn) is implicated in Parkinson's disease (PD), a neuromotor disorder with prominent visual symptoms. The underlying cause of motor dysfunction has been studied extensively, and is attributed to the death of dopaminergic neurons mediated in part by intracellular aggregation of α-Syn. The cause of visual symptoms, however, is less clear. Neuroretinal degeneration due to the presence of aggregated α-Syn has been reported, but the evidence is controversial. Other symptoms including those arising from primary open angle glaucoma (POAG) are believed to be the side-effects of medications prescribed for PD. Here, we explored the alternative hypothesis that dysfunction of α-Syn in the anterior eye alters the interaction between the actin cytoskeleton of trabecular meshwork (TM) cells with the extracellular matrix (ECM), impairing their ability to respond to physiological changes in intraocular pressure (IOP). A similar dysfunction in neurons is responsible for impaired neuritogenesis, a characteristic feature of PD. Using cadaveric human and bovine TM tissue and primary human TM cells as models, we report two main observations: 1) α-Syn is expressed in human and bovine TM cells, and significant amounts of monomeric and oligomeric α-Syn are present in the AH, and 2) primary human TM cells and human and bovine TM tissue endocytose extracellular recombinant monomeric and oligomeric α-Syn via the prion protein (PrPC), and upregulate fibronectin (FN) and α-smooth muscle actin (α-SMA), fibrogenic proteins implicated in POAG. Transforming growth factor β2 (TGFβ2), a fibrogenic cytokine implicated in ∼50% cases of POAG, is also increased, and so is RhoA-associated coiled-coil-containing protein kinase 1 (ROCK-1). However, silencing of α-Syn in primary human TM cells reduces FN, α-SMA, and ROCK-1 in the absence or presence of over-expressed active TGFβ2, suggesting modulation of FN and ROCK-1 independent of, or upstream of TGFβ2. These observations suggest that extracellular α-Syn modulates ECM proteins in the TM independently or via PrPC by activating the RhoA-ROCK pathway. These observations reveal a novel function of α-Syn in the anterior eye, and offer new therapeutic options.
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Affiliation(s)
- Anika Adulla
- Departments of Pathology, School of Medicine, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Urvi Patel
- Departments of Pathology, School of Medicine, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Ajay Ashok
- Departments of Pathology, School of Medicine, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Priya Katiyar
- Departments of Pathology, School of Medicine, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Mare Kaulakis
- Departments of Pathology, School of Medicine, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Alexander E Kritikos
- Departments of Pathology, School of Medicine, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Sachin Pillai
- Departments of Pathology, School of Medicine, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - HyunPin Lee
- Departments of Ophthalmology, School of Medicine, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Ewald Lindner
- Department of Ophthalmology, Medical University of Graz, Auenbruggerplatz 4, 8036, Graz, Austria
| | - Douglas J Rhee
- Departments of Ophthalmology, School of Medicine, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Neena Singh
- Departments of Pathology, School of Medicine, Case Western Reserve University, Cleveland, OH, 44106, USA.
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Shao J, Liu X, Lian M, Mao Y. Citronellol Prevents 6-OHDA-Induced Oxidative Stress, Mitochondrial Dysfunction, and Apoptosis in Parkinson Disease Model of SH-SY5Y Cells via Modulating ROS-NO, MAPK/ERK, and PI3K/Akt Signaling Pathways. Neurotox Res 2022; 40:2221-2237. [PMID: 36097250 DOI: 10.1007/s12640-022-00558-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 07/13/2022] [Accepted: 08/09/2022] [Indexed: 12/31/2022]
Abstract
Parkinson disease is a neurodegenerative disorder distinguished by dopaminergic shortage in the striatum and the accumulation of α-synuclein neuronal aggregates in the brains of patients. Since, there is no accurate treatment available for Parkinson disease, researches are designed to alleviate the pathognomonic symptoms such as neuroinflammation, oxidative stress, mitochondrial dysfunction, and apoptosis. Accordingly, a number of compounds have been reported to inhibit these pathognomonic symptoms. In this study, we have assessed the neuroprotective potential of citronellol against 6-OHDA-induced neurotoxicity in SH-SY5Y cells. The results found that citronellol treatment effectively hindered the cell death caused by 6-OHDA and thereby maintaining the cell viability in SH-SY5Y cells at 50 µg/mL concentration. As expected, the citronellol treatment significantly reduced the 6-OHDA-induced secretion of inflammatory factors (IL-1β, IL-6, and TNF-α), which was obtained through ELISA technique. Similarly, citronellol hindered the 6-OHDA-induced oxidative stress by lowering the intracellular ROS and NO level and MDA leakage along with increased expression of SOD level in SH-SY5Y cells. The JC-1 staining showed that 6-OHDA increased the number of green fluorescent dots with ruptured mitochondrial membrane potential, while citronellol increased the amount of red fluorescent, showing the rescue potential against the 6-OHDA-induced mitochondrial dysfunction. Furthermore, citronellol hampered the 6-OHDA-induced apoptosis via the suppression of Bcl-2/Bax pathway. The western blotting results hypothesized that citronellol rescued SH-SY5Y cells from 6-OHDA-induced neurotoxicity via modulating ROS-NO, MAPK/ERK, and PI3K/Akt signaling pathways. However, further clinical trials are required to verify the anti-Parkinson efficacy.
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Affiliation(s)
- Jiahui Shao
- Department of Neurology, The First People's Hospital of Wenling, Zhejiang Province, Wenling, 317500, China
| | - Xuan Liu
- Department of Neurology, The First People's Hospital of Wenling, Zhejiang Province, Wenling, 317500, China
| | - Mengjia Lian
- Department of Neurology, The First People's Hospital of Wenling, Zhejiang Province, Wenling, 317500, China
| | - Youbing Mao
- Department of Special Inspection Section, The First People's Hospital of Wenling, No. 333, Chuanan South Road, Chengxi StreetZhejiang Province, Wenling, 317500, China.
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36
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Berg A, Bech S, Aasly J, Farrer MJ, Skaalum Petersen M. Autonomic dysfunction in Parkinson's disease: Results from the Faroese Parkinson's disease cohort. Neurosci Lett 2022; 785:136789. [PMID: 35835395 DOI: 10.1016/j.neulet.2022.136789] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 07/04/2022] [Accepted: 07/08/2022] [Indexed: 10/17/2022]
Abstract
The presence of autonomic symptoms are a common part of the symptomatology of Parkinsońs disease (PD), with the potential to impact the quality of life of patients. The aim of this study was to assess the frequency of autonomic symptoms among Faroese PD patients compared to a control group, using the Scales for Outcome in Parkinson's Disease - Autonomic (SCOPA-AUT), and to determine the relationship between autonomic and motor symptoms in PD patients using the Unified Parkinsońs Disease Rating Scale - Part III (UPDRS) and Hoehn and Yahr Scale (H&Y). The study included 54 PD patients and 190 control individuals which were unaffected relatives. The mean SCOPA-AUT scores were significantly higher for PD patients in gastrointestinal (OR = 1.62), urinary (OR = 1.38), cardiovascular (OR = 1.65), thermoregulatory (OR = 1.54) and sexual dysfunction (OR = 1.71) scores, as well as the total score (OR = 1.26). UPDRS scores were significant correlated with SCOPA-AUT scores (p = 0.015), while H&Y scores were not (p = 0.103). In conclusion, PD patients experience an increased frequency of autonomic symptoms compared with controls and the frequency is associated with the motor symptoms assessed with UPDRS. Our findings are consistent with similar studies and our current understanding of PD pathology.
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Affiliation(s)
- Aksel Berg
- Department of Occupational Medicine and Public Health, the Faroese Hospital System, Tórshavn, Faroe Islands.
| | - Sára Bech
- Department of Occupational Medicine and Public Health, the Faroese Hospital System, Tórshavn, Faroe Islands
| | - Jan Aasly
- Department of Neurology, St. Olavs University Hospital, Trondheim, Norway; Department of Neuroscience, Norwegian University of Science and Technology, Trondheim, Norway
| | - Matthew J Farrer
- Norman Fixel Institute for Neurological Diseases, McKnight Brain Institute, University of Florida, Gainesville, USA
| | - Maria Skaalum Petersen
- Department of Occupational Medicine and Public Health, the Faroese Hospital System, Tórshavn, Faroe Islands; Center of Health Science, University of the Faroe Islands, Tórshavn, Faroe Islands
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37
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Batum M, Ak AK, Arı MS, Mayali H, Kurt E, Selçuki D. Evaluation of the visual system with visual evoked potential and optical coherence tomography in patients with idiopathic Parkinson's disease and with multiple system atrophy. Doc Ophthalmol 2022; 145:99-112. [PMID: 35881261 DOI: 10.1007/s10633-022-09887-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Accepted: 06/23/2022] [Indexed: 11/25/2022]
Abstract
BACKGROUND In addition to motor findings, non-motor findings including alterations in visual acuity, decrease in blink reflex, and pupil reactivity cause the impaired quality of life in idiopathic Parkinson's disease (PD) and multiple system atrophy (MSA). Our study aimed to examine possible latency and amplitude changes in pattern visual evoked potentials (pVEP) along with retinal and macular changes in optical coherence tomography (OCT) in PD and MSA groups. We also intended to investigate whether any OCT parameters could be a biomarker for Parkinson's or MSA. METHODS Our study included 50 patients with PD, 15 with MSA, and 50 healthy control subjects. All patients in the study underwent neurological and ophthalmological examination and investigations of OCT to measure the retinal and macular thickness and pVEP to assess visual pathways. RESULTS When PD, MSA, and control groups were compared, a significant difference was found in all retinal thickness values in average, nasal, and superior retinal nerve fiber thickness (pRNFL), and in all macular thickness values except nasal outer and inferior outer quadrants and in ganglion cell complex (GCC) thicknesses (p < 0.05). Moreover, a significant difference was found in N75, P100, and N145 latencies and N75-P100 amplitude (p < 0.05). The thickness of both pRNFL, inner and outer macular quadrants, was thinner in the MSA group than in PD but GCC thickness was thinner in PD group. CONCLUSIONS The present study compared pVEP and OCT parameters in PD and MSA groups. It was concluded that pVEP and OCT examinations were of importance in that they were easily accessible, affordable, noninvasive biomarkers that might be used in early periods and progression of the disease and in follow-up.
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Affiliation(s)
- Melike Batum
- Department of Neurology, Celal Bayar University Medical School Hafsa Sultan Hospital, Manisa, Turkey.
| | - Ayşın Kısabay Ak
- Department of Neurology, Celal Bayar University Medical School Hafsa Sultan Hospital, Manisa, Turkey
| | - Mehmet Semih Arı
- Department of Neurology, Celal Bayar University Medical School Hafsa Sultan Hospital, Manisa, Turkey
| | - Hüseyin Mayali
- Department of Eye Diseases, Celal Bayar University Medical School Hafsa Sultan Hospital, Manisa, Turkey
| | - Emin Kurt
- Department of Eye Diseases, Celal Bayar University Medical School Hafsa Sultan Hospital, Manisa, Turkey
| | - Deniz Selçuki
- Department of Neurology, Celal Bayar University Medical School Hafsa Sultan Hospital, Manisa, Turkey
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The macular inner plexiform layer thickness as an early diagnostic indicator for Parkinson's disease. NPJ Parkinsons Dis 2022; 8:63. [PMID: 35614125 PMCID: PMC9132921 DOI: 10.1038/s41531-022-00325-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 05/05/2022] [Indexed: 11/25/2022] Open
Abstract
Whether structural alterations of intraretinal layers are indicators for the early diagnosis of Parkinson’s disease (PD) remains unclear. We assessed the retinal layer thickness in different stages of PD and explored whether it can be an early diagnostic indicator for PD. In total, 397 [131, 146, and 120 with Hoehn-Yahr I (H-Y I), H-Y II, and H-Y III stages, respectively] patients with PD and 427 healthy controls (HCs) were enrolled. The peripapillary retinal nerve fiber layer (pRNFL), total macular retinal thickness (MRT), and macular volume (TMV) were measured by high-definition optical coherence tomography, and the macular intraretinal thickness was analyzed by the Iowa Reference Algorithms. As a result, the PD group had a significantly lower average, temporal quadrant pRNFL, MRT, and TMV than the HCs group (all p < 0.001). Moreover, the ganglion cell layer (GCL), inner plexiform layer (IPL), and outer nuclear layer were thinner in patients with PD with H-Y I, and significantly decreased as the H-Y stage increased. In addition, we observed that GCL and IPL thicknesses were both correlated with Movement Disorder Society-Unified Parkinson’s Disease Rating Scale III (MDS-UPDRS III) scores and non-motor symptoms assessment scores. Furthermore, macular IPL thickness in the superior inner (SI) quadrant (IPL-SI) had the best diagnostic performance in patients with PD with H-Y I versus HCs, with a sensitivity and specificity of 75.06% and 81.67%, respectively. In conclusion, we confirmed the retinal structure was significantly altered in patients with PD in different clinical stages, and that GCL and IPL changes occurred during early PD disease and were correlated with MDS-UPDRS III scores and non-motor symptoms assessment scores. Furthermore, macular IPL-SI thickness might be performed as an early diagnostic indicator for PD.
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39
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Li YY, Zhou TT, Zhang Y, Chen NH, Yuan YH. Distribution of α-Synuclein Aggregation in the Peripheral Tissues. Neurochem Res 2022; 47:3627-3634. [PMID: 35348944 DOI: 10.1007/s11064-022-03586-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 03/11/2022] [Accepted: 03/17/2022] [Indexed: 12/16/2022]
Abstract
Parkinson's disease (PD) is a chronic neurodegenerative disease mainly characterized by movement disorders and other non-motor symptoms, including the loss of dopaminergic neurons in the substantia nigra parts. Abnormal α-synuclein aggregation in the brain is closely associated with the loss of dopaminergic neurons. α-synuclein can propagate in the central nervous system (CNS) and periphery under pathological conditions. Many researches have focused on its aggregation and distribution in the CNS and explored its relationship with PD. But in recent years, the distribution of α-synuclein in peripheral tissues have been paid much attention. This review summarized the distribution of α-synuclein in the choroid plexus, blood, saliva, gastrointestine and other tissues, and discussed the potential mechanism of α-synuclein aggregation, providing a basis for the early diagnosis and intervention of PD.
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Affiliation(s)
- Yan-Yan Li
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica & Neuroscience Center, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Tian-Tian Zhou
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica & Neuroscience Center, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China
| | - Yi Zhang
- Department of Anatomy, School of Chinese Medicine, Beijing University of Chinese Medicine, Beijing, 102488, China
| | - Nai-Hong Chen
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica & Neuroscience Center, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China. .,Department of Pharmacology, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, I Xiannongtan Street, Xicheng District, Beijing, 100050, China.
| | - Yu-He Yuan
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica & Neuroscience Center, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100050, China. .,Department of Pharmacology, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, I Xiannongtan Street, Xicheng District, Beijing, 100050, China.
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40
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Wareham LK, Liddelow SA, Temple S, Benowitz LI, Di Polo A, Wellington C, Goldberg JL, He Z, Duan X, Bu G, Davis AA, Shekhar K, Torre AL, Chan DC, Canto-Soler MV, Flanagan JG, Subramanian P, Rossi S, Brunner T, Bovenkamp DE, Calkins DJ. Solving neurodegeneration: common mechanisms and strategies for new treatments. Mol Neurodegener 2022; 17:23. [PMID: 35313950 PMCID: PMC8935795 DOI: 10.1186/s13024-022-00524-0] [Citation(s) in RCA: 94] [Impact Index Per Article: 47.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 02/18/2022] [Indexed: 02/06/2023] Open
Abstract
Across neurodegenerative diseases, common mechanisms may reveal novel therapeutic targets based on neuronal protection, repair, or regeneration, independent of etiology or site of disease pathology. To address these mechanisms and discuss emerging treatments, in April, 2021, Glaucoma Research Foundation, BrightFocus Foundation, and the Melza M. and Frank Theodore Barr Foundation collaborated to bring together key opinion leaders and experts in the field of neurodegenerative disease for a virtual meeting titled "Solving Neurodegeneration". This "think-tank" style meeting focused on uncovering common mechanistic roots of neurodegenerative disease and promising targets for new treatments, catalyzed by the goal of finding new treatments for glaucoma, the world's leading cause of irreversible blindness and the common interest of the three hosting foundations. Glaucoma, which causes vision loss through degeneration of the optic nerve, likely shares early cellular and molecular events with other neurodegenerative diseases of the central nervous system. Here we discuss major areas of mechanistic overlap between neurodegenerative diseases of the central nervous system: neuroinflammation, bioenergetics and metabolism, genetic contributions, and neurovascular interactions. We summarize important discussion points with emphasis on the research areas that are most innovative and promising in the treatment of neurodegeneration yet require further development. The research that is highlighted provides unique opportunities for collaboration that will lead to efforts in preventing neurodegeneration and ultimately vision loss.
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Affiliation(s)
- Lauren K Wareham
- Department of Ophthalmology and Visual Sciences, Vanderbilt Eye Institute, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Shane A Liddelow
- Neuroscience Institute, NYU Grossman School of Medicine, New York, NY, USA
| | - Sally Temple
- Neural Stem Cell Institute, NY, 12144, Rensselaer, USA
| | - Larry I Benowitz
- Department of Neurosurgery and F.M. Kirby Neurobiology Center, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Adriana Di Polo
- Department of Neuroscience, University of Montreal, Montreal, QC, Canada
| | - Cheryl Wellington
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada
| | - Jeffrey L Goldberg
- Spencer Center for Vision Research, Byers Eye Institute, Stanford University, CA, Palo Alto, USA
| | - Zhigang He
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, MA, Boston, USA
| | - Xin Duan
- Department of Ophthalmology, University of California San Francisco, San Francisco, CA, USA
| | - Guojun Bu
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, USA
| | - Albert A Davis
- Department of Neurology, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Karthik Shekhar
- Department of Chemical and Biomolecular Engineering and Helen Wills Neuroscience Institute, University of California Berkeley, Berkeley, CA, USA
| | - Anna La Torre
- Department of Cell Biology and Human Anatomy, University of California Davis, Davis, CA, USA
| | - David C Chan
- Division of Biology and Biological Engineering, California Institute of Technology, CA, 91125, Pasadena, USA
| | - M Valeria Canto-Soler
- CellSight Ocular Stem Cell and Regeneration Research Program, Department of Ophthalmology, Sue Anschutz-Rodgers Eye Center, University of Colorado, Aurora, CO, USA
| | - John G Flanagan
- Herbert Wertheim School of Optometry and Vision Science, University of California Berkeley, Berkeley, CA, USA
| | | | | | | | | | - David J Calkins
- Department of Ophthalmology and Visual Sciences, Vanderbilt Eye Institute, Vanderbilt University Medical Center, Nashville, TN, USA.
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Multimodal brain and retinal imaging of dopaminergic degeneration in Parkinson disease. Nat Rev Neurol 2022; 18:203-220. [PMID: 35177849 DOI: 10.1038/s41582-022-00618-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/13/2022] [Indexed: 12/12/2022]
Abstract
Parkinson disease (PD) is a progressive disorder characterized by dopaminergic neurodegeneration in the brain. The development of parkinsonism is preceded by a long prodromal phase, and >50% of dopaminergic neurons can be lost from the substantia nigra by the time of the initial diagnosis. Therefore, validation of in vivo imaging biomarkers for early diagnosis and monitoring of disease progression is essential for future therapeutic developments. PET and single-photon emission CT targeting the presynaptic terminals of dopaminergic neurons can be used for early diagnosis by detecting axonal degeneration in the striatum. However, these techniques poorly differentiate atypical parkinsonian syndromes from PD, and their availability is limited in clinical settings. Advanced MRI in which pathological changes in the substantia nigra are visualized with diffusion, iron-sensitive susceptibility and neuromelanin-sensitive sequences potentially represents a more accessible imaging tool. Although these techniques can visualize the classic degenerative changes in PD, they might be insufficient for phenotyping or prognostication of heterogeneous aspects of PD resulting from extranigral pathologies. The retina is an emerging imaging target owing to its pathological involvement early in PD, which correlates with brain pathology. Retinal optical coherence tomography (OCT) is a non-invasive technique to visualize structural changes in the retina. Progressive parafoveal thinning and fovea avascular zone remodelling, as revealed by OCT, provide potential biomarkers for early diagnosis and prognostication in PD. As we discuss in this Review, multimodal imaging of the substantia nigra and retina is a promising tool to aid diagnosis and management of PD.
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Xu B, Wang X, Guo J, Xu H, Tang B, Jiao B, Shen L. Retinal Microvascular Density Was Associated With the Clinical Progression of Parkinson’s Disease. Front Aging Neurosci 2022; 14:818597. [PMID: 35250544 PMCID: PMC8891808 DOI: 10.3389/fnagi.2022.818597] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 01/21/2022] [Indexed: 01/03/2023] Open
Abstract
Background Retinal microvascular density has been studied in neurodegenerative diseases, whereas patients with Parkinson’s disease (PD) at different clinical stages have been rarely investigated. The present study aimed to evaluate the microvascular variations in superficial retinal capillary plexus (SCP) in patients with PD on different Hoehn-Yahr (H-Y) stages by optical coherence tomography angiography (OCTA), as well as determine their relationships with clinical parameters. Methods In total, 115 patients with PD and 67 healthy controls (HCs) were recruited. The PD group was divided into three groups based on the H-Y stage. The OCTA examination was performed in all participants, and the macular vessel density (m-VD), peripapillary vessel density (p-VD), and foveal avascular zone (FAZ) area were measured. Results The m-VD in all regions, p-VD in center [6.1 (4.8, 6.95) mm–1 in healthy eyes vs. 5.1 (3.7, 6.4) mm–1 in patients], nasal inner (NI) [18.5 (17.8, 19.3) mm–1 in healthy eyes vs. 17.9 (17.1, 18.7) mm–1 in patients], temporal outer (TO) [19.6 (18.9, 20.2) mm–1 in healthy eyes vs. 19.3 (18.5, 19.7) mm–1 in patients] regions and FAZ area [0.36 (0.32, 0.39) mm2 in healthy eyes vs. 0.29 (0.26, 0.33) mm2 in patients] noticeably decreased in PD groups compared with HC (p < 0.05). Moreover, the FAZ area was suggested to decline significantly in patients with PD with H-Y I stage (p < 0.05), while it was more serious in the H-Y III stage in patients. Furthermore, we found that m-VD exhibited a significant negative correlation with age, disease duration, UPDRS scores, NMSS scores, and H-Y stage. Conclusion OCTA has the potential to non-invasively detect the microvascular changes in patients with PD with different clinical stages in vivo, and it may be a valuable tool to monitor the PD progression.
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Affiliation(s)
- Bei Xu
- Eye Center of Xiangya Hospital, Central South University, Changsha, China
- Hunan Key Laboratory of Ophthalmology, Changsha, China
| | - Xin Wang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Jifeng Guo
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
- Engineering Research Center of Hunan Province in Cognitive Impairment Disorders, Central South University, Changsha, China
- Hunan International Scientific and Technological Cooperation Base of Neurodegenerative and Neurogenetic Diseases, Changsha, China
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, China
| | - Huizhuo Xu
- Eye Center of Xiangya Hospital, Central South University, Changsha, China
- Hunan Key Laboratory of Ophthalmology, Changsha, China
| | - Beisha Tang
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
- Engineering Research Center of Hunan Province in Cognitive Impairment Disorders, Central South University, Changsha, China
- Hunan International Scientific and Technological Cooperation Base of Neurodegenerative and Neurogenetic Diseases, Changsha, China
| | - Bin Jiao
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
- Engineering Research Center of Hunan Province in Cognitive Impairment Disorders, Central South University, Changsha, China
- Hunan International Scientific and Technological Cooperation Base of Neurodegenerative and Neurogenetic Diseases, Changsha, China
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, China
- Bin Jiao,
| | - Lu Shen
- Department of Neurology, Xiangya Hospital, Central South University, Changsha, China
- National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, China
- Engineering Research Center of Hunan Province in Cognitive Impairment Disorders, Central South University, Changsha, China
- Hunan International Scientific and Technological Cooperation Base of Neurodegenerative and Neurogenetic Diseases, Changsha, China
- Key Laboratory of Hunan Province in Neurodegenerative Disorders, Central South University, Changsha, China
- *Correspondence: Lu Shen,
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Chang Z, Xie F, Li H, Yuan F, Zeng L, Shi L, Zhu S, Lu X, Wei X, Wang Q. Retinal Nerve Fiber Layer Thickness and Associations With Cognitive Impairment in Parkinson’s Disease. Front Aging Neurosci 2022; 14:832768. [PMID: 35222000 PMCID: PMC8867012 DOI: 10.3389/fnagi.2022.832768] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 01/20/2022] [Indexed: 01/18/2023] Open
Abstract
ObjectiveThis study intended to investigate whether retinal nerve fiber layer (RNFL) thickness could become a potential marker in patients with Parkinson’s disease with cognitive impairment (PD-CI).MethodsFifty-seven PD patients and 45 age-matched healthy controls (HCs) were recruited in our cross-sectional study and completed optical coherence tomography (OCT) evaluations. PD with normal cognition (PD-NC) and cognitive impairment (PD-CI) patients were divided following the 2015 Movement Disorder Society criteria. RNFL thickness was quantified in subfields of the 3.0-mm circle surrounding the optic disk; while a battery of neuropsychiatric assessments was conducted to estimate the Parkinsonism severity. General linear models and one-way ANOVA were adopted to assess RNFL thickness between subgroups with different cognitive statuses; logistic regression analyses were applied to determine the relation between RNFL and PD-CI cases.ResultsCompared with HCs, more thinning of the RNFL was observed in the inferior and temporal sectors in PD patients, especially in the PD-CI group. Inferior RNFL thickness was reduced in PD-CI compared with PD-NC patients. Logistic regression analysis found that inferior RNFL thickness was independently associated with PD-CI cases (odds ratio = 0.923, p = 0.014). Receiver operating characteristic analysis showed that the RNFL-involved combined model provided a high accuracy in screening cognitive deficiency in PD cases (area under the curve = 0.85, p < 0.001).ConclusionReduced RNFL thickness especially in the inferior sector is independently associated with PD-CI patients. Our study present new perspectives into verifying possible indicators for neuropathological processes or disease severity in Parkinsonians with cognitive dysfunction.
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Affiliation(s)
- Zihan Chang
- Department of Neurology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Fen Xie
- Department of Neurology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Hualing Li
- Department of Neurology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Feilan Yuan
- Department of Neurology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Lina Zeng
- Department of Ophthalmology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Lin Shi
- Department of Imaging and Interventional Radiology, The Chinese University of Hong Kong, Hong Kong, Hong Kong SAR, China
| | - Shuzhen Zhu
- Department of Neurology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Xiaohe Lu
- Department of Ophthalmology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- *Correspondence: Xiaohe Lu,
| | - Xiaobo Wei
- Department of Neurology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Xiaobo Wei,
| | - Qing Wang
- Department of Neurology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
- Qing Wang, ;
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Zhang Y, Zhang X, Yue Y, Tian T. Retinal Degeneration: A Window to Understand the Origin and Progression of Parkinson’s Disease? Front Neurosci 2022; 15:799526. [PMID: 35185448 PMCID: PMC8854654 DOI: 10.3389/fnins.2021.799526] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 12/09/2021] [Indexed: 11/13/2022] Open
Abstract
Parkinson’s disease (PD), the second most prevalent neurodegenerative disorder, manifests with motor and non-motor symptoms associated with two main pathological hallmarks, including the deterioration of dopaminergic cells and aggregation of alpha-synuclein. Yet, PD is a neurodegenerative process whose origin is uncertain and progression difficult to monitor and predict. Currently, a possibility is that PD may be secondary to long lasting peripheral affectations. In this regard, it has been shown that retinal degeneration is present in PD patients. Although it is unknown if retinal degeneration precedes PD motor symptoms, the possibility exists since degeneration of peripheral organs (e.g., olfaction, gut) have already been proven to antedate PD motor symptoms. In this paper, we explore this possibility by introducing the anatomical and functional relationship of retina and brain and providing an overview of the physiopathological changes of retinal structure and visual function in PD. On the basis of the current status of visual deficits in individuals with PD, we discuss the modalities and pathological mechanism of visual function or morphological changes in the retina and focus on the correlation between visual impairment and some representative structural features with clinical significance. To consider retinal degeneration as a contributor to PD origin and progress is important because PD evolution may be monitored and predicted by retinal studies through state-of-the-art techniques of the retina. It is significant to integrally understand the role of retinal morphological and functional changes in the neurodegenerative process for the diagnosis and therapeutic strategies of PD.
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Affiliation(s)
- Yanyan Zhang
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, China
- Department of Neurology, Yangpu Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Xiaoguang Zhang
- Department of Neurology, Yangpu Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Yunhua Yue
- Department of Neurology, Yangpu Hospital, School of Medicine, Tongji University, Shanghai, China
- *Correspondence: Yunhua Yue,
| | - Tian Tian
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, China
- Tian Tian,
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45
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Nikitina A, Melnikova N, Moshetova L, Levin O. Visual disturbances in Parkinson’s disease. Zh Nevrol Psikhiatr Im S S Korsakova 2022; 122:5-11. [DOI: 10.17116/jnevro20221221125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Peripapillary retinal nerve fiber layer thinning in patients with progressive supranuclear palsy. J Neurol 2021; 269:3216-3225. [PMID: 34921616 PMCID: PMC9120117 DOI: 10.1007/s00415-021-10936-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Revised: 12/08/2021] [Accepted: 12/09/2021] [Indexed: 11/26/2022]
Abstract
Objectives To investigate peripapillary retinal nerve fiber layer (pRNFL) changes in patients with progressive supranuclear palsy (PSP). Methods We included 21 PSP patients (36 eyes) who underwent peripapillary optical coherence tomography (OCT) scans at 2.5 ± 1.3 years of disease, without ophthalmologic co-morbidities. We compared pRNFL thicknesses in PSP eyes with age-matched 22 controls (22 eyes) using generalized estimating equation model adjusting for intra-subject inter-eye correlations, age and sex. We also analyzed the correlation between the pRNFL thickness and clinical severity using Spearman’s correlation. In twelve PSP patients with 3 T brain MRI volumetric scan within 1 year of OCT exam, we investigated the correlation between the pRNFL thickness and brain atrophy using Pearson’s correlation. Results PSP patients had global pRNFL thinning compared to controls (beta = − 6.436, p = 0.025). Global pRNFL thickness correlated with Hoehn & Yahr stages (r = − 0.487, p = 0.025), and nasal pRNFL thinning showed a trend of correlation (uncorrected p < 0.05). Exploratory correlation analysis between global pRNFL thickness and nonmotor items in the PSP rating scale showed a trend toward association with sleep disturbances (uncorrected p = 0.008) and urinary incontinence (uncorrected p = 0.031), although not significant after Bonferroni correction (all 28 items). The patients had significant atrophy in the posterior cingulate cortex, third ventricle, pallidum, and midbrain with reduced midbrain-to-pons ratio, but no correlation was found between pRNFL thickness and brain volumes. Conclusion The pRNFL seems to be affected in PSP, which is more severe with advanced disease stages. Retinal investigation in a larger longitudinal cohort would help elucidate the pathophysiological role of retinal thinning in PSP. Supplementary Information The online version contains supplementary material available at 10.1007/s00415-021-10936-5.
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47
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Wilson D, Hallett M, Anderson T. An Eye on Movement Disorders. Mov Disord Clin Pract 2021; 8:1168-1180. [PMID: 34765682 DOI: 10.1002/mdc3.13317] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 06/28/2021] [Accepted: 07/20/2021] [Indexed: 02/06/2023] Open
Abstract
Eye disorders spanning a range of ocular tissue are common in patients with movement disorders. Highlighting these ocular manifestations will benefit patients and may even aid in diagnosis. In this educational review we outline the anatomy and function of the ocular tissues with a focus on the tissues most affected in movement disorders. We review the movement disorders associated with ocular pathology and where possible explore the underlying cellular basis thought to be driving the pathology and provide a brief overview of ophthalmic investigations available to the neurologist. This review does not cover intracranial primary visual pathways, higher visual function, or the ocular motor system.
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Affiliation(s)
- Duncan Wilson
- Department of Neurology Christchurch Hospital Christchurch New Zealand.,New Zealand Brain Research Institute Christchurch New Zealand
| | - Mark Hallett
- Human Motor Control Section, NINDS, NIH Bethesda Maryland USA
| | - Tim Anderson
- Department of Neurology Christchurch Hospital Christchurch New Zealand.,New Zealand Brain Research Institute Christchurch New Zealand.,Department of Medicine Otago University Dunedin New Zealand
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48
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Savitt J, Aouchiche R. Management of Visual Dysfunction in Patients with Parkinson's Disease. JOURNAL OF PARKINSONS DISEASE 2021; 10:S49-S56. [PMID: 32741840 PMCID: PMC7592686 DOI: 10.3233/jpd-202103] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Parkinson’s disease (PD) is a movement disorder with many symptoms responsive to treatment with dopamine agonists, anti-cholinergics and the dopamine precursor, levodopa. The cardinal features of PD include tremor, rigidity, bradykinesia, and postural instability. There also are non-motor features that include sleep disorders, cognitive and affective dysfunction, hyposmia, pain and dysautonomia (constipation, bloating, orthostasis, urinary symptoms, sexual dysfunction, dysphagia). Among these non-motor features are signs and symptoms of visual system impairment that range from subtle examination findings to those causing severe disability. In this review we describe common PD-related abnormalities in the visual system, how they present, and potential treatments.
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Affiliation(s)
- Joseph Savitt
- Department of Neurology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Rachid Aouchiche
- Department of Ophthalmology and Visual Sciences, University of Maryland School of Medicine, Neuro-Ophthalmology, Baltimore, MD, USA
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Veys L, Devroye J, Lefevere E, Cools L, Vandenabeele M, De Groef L. Characterizing the Retinal Phenotype of the Thy1-h[A30P]α-syn Mouse Model of Parkinson's Disease. Front Neurosci 2021; 15:726476. [PMID: 34557068 PMCID: PMC8452874 DOI: 10.3389/fnins.2021.726476] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Accepted: 08/19/2021] [Indexed: 12/30/2022] Open
Abstract
Despite decades of research, disease-modifying treatments of Parkinson’s disease (PD), the second most common neurodegenerative disease worldwide, remain out of reach. One of the reasons for this treatment gap is the incomplete understanding of how misfolded alpha-synuclein (α-syn) contributes to PD pathology. The retina, as an integral part of the central nervous system, recapitulates the PD disease processes that are typically seen in the brain, and retinal manifestations have emerged as prodromal symptoms of the disease. The timeline of PD manifestations in the visual system, however, is not fully elucidated and the underlying mechanisms are obscure. This highlights the need for new studies investigating retinal pathology, in order to propel its use as PD biomarker, and to develop validated research models to investigate PD pathogenesis. The present study pioneers in characterizing the retina of the Thy1-h[A30P]α-syn PD transgenic mouse model. We demonstrate widespread α-syn accumulation in the inner retina of these mice, of which a proportion is phosphorylated yet not aggregated. This α-syn expression coincides with inner retinal atrophy due to postsynaptic degeneration. We also reveal abnormal retinal electrophysiological responses. Absence of selective loss of melanopsin retinal ganglion cells or dopaminergic amacrine cells and inflammation indicates that the retinal manifestations in these transgenic mice diverge from their brain phenotype, and questions the specific cellular or molecular alterations that underlie retinal pathology in this PD mouse model. Nevertheless, the observed α-syn accumulation, synapse loss and functional deficits suggest that the Thy1-h[A30P]α-syn retina mimics some of the features of prodromal PD, and thus may provide a window to monitor and study the preclinical/prodromal stages of PD, PD-associated retinal disease processes, as well as aid in retinal biomarker discovery and validation.
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Affiliation(s)
- Lien Veys
- Research Group of Neural Circuit Development and Regeneration, Department of Biology, KU Leuven, Leuven, Belgium.,Department of Biomedical Sciences, Leuven Brain Institute, Leuven, Belgium
| | - Joyce Devroye
- Research Group of Neural Circuit Development and Regeneration, Department of Biology, KU Leuven, Leuven, Belgium.,Department of Biomedical Sciences, Leuven Brain Institute, Leuven, Belgium
| | - Evy Lefevere
- Research Group of Neural Circuit Development and Regeneration, Department of Biology, KU Leuven, Leuven, Belgium.,Department of Biomedical Sciences, Leuven Brain Institute, Leuven, Belgium
| | - Lien Cools
- Research Group of Neural Circuit Development and Regeneration, Department of Biology, KU Leuven, Leuven, Belgium.,Department of Biomedical Sciences, Leuven Brain Institute, Leuven, Belgium
| | - Marjan Vandenabeele
- Research Group of Neural Circuit Development and Regeneration, Department of Biology, KU Leuven, Leuven, Belgium.,Department of Biomedical Sciences, Leuven Brain Institute, Leuven, Belgium
| | - Lies De Groef
- Research Group of Neural Circuit Development and Regeneration, Department of Biology, KU Leuven, Leuven, Belgium.,Department of Biomedical Sciences, Leuven Brain Institute, Leuven, Belgium
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50
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Zhou M, Wu L, Hu Q, Wang C, Ye J, Chen T, Wan P. Visual Impairments Are Associated With Retinal Microvascular Density in Patients With Parkinson's Disease. Front Neurosci 2021; 15:718820. [PMID: 34475812 PMCID: PMC8406760 DOI: 10.3389/fnins.2021.718820] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 07/14/2021] [Indexed: 11/28/2022] Open
Abstract
Objective This study aimed to evaluate retinal microvascular density in patients with Parkinson’s disease (PD) and its correlation with visual impairment. Methods This cross-sectional study included 24 eyes of 24 patients with PD and 23 eyes of 23 healthy controls. All participants underwent ophthalmic examination, visual evoked potential (VEP) test, 25-item National Eye Institute Visual Function Questionnaire (NEI VFQ-25), and optical coherence tomography angiography (OCTA) examination. The correlation between retinal microvascular density and visual parameter was evaluated using Spearman correlation analysis, and the area under receiver operating characteristic curve (AUROC) was calculated. Results Parkinson’s disease patients had prolonged P100 latency (P = 0.041), worse vision-related quality of life (composite score and 3 of 12 subscales in NEI VFQ-25), and decreased vessel density (VD) in all sectors of 3-mm-diameter region (all P < 0.05) compared with healthy controls. There were no statistical differences in the ganglion cell-inner plexiform layer (GCIPL) thickness and retinal nerve fiber layer (RNFL) thickness between the two groups. A negative correlation was found between P100 latency and nasal and superior sectors of macular VD in a 3-mm-diameter region (r = −0.328, P = 0.030; r = −0.302, and P = 0.047, respectively). Macular VD in a 3-mm-diameter region showed diagnostic capacities to distinguish PD patients from healthy controls (AUROCs, ranging from 0.655 to 0.723). Conclusion This study demonstrated that decreased retinal microvascular density was correlated with visual impairment in PD patients. Retinal microvasculature change may occur earlier than visual decline and retinal structure change and has the potential to be a promising diagnostic marker for early PD.
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Affiliation(s)
- Min Zhou
- Department of Ophthalmology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Lei Wu
- Department of Neurology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Qinyuan Hu
- Department of Ophthalmology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Congyao Wang
- Department of Ophthalmology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Jiacheng Ye
- Department of Ophthalmology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Tingting Chen
- Department of Ophthalmology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Pengxia Wan
- Department of Ophthalmology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
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