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Jonas JB, Aung T, Bourne RR, Bron AM, Ritch R, Panda-Jonas S. Glaucoma. Lancet 2017; 390:2183-2193. [PMID: 28577860 DOI: 10.1016/s0140-6736(17)31469-1] [Citation(s) in RCA: 782] [Impact Index Per Article: 111.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 04/11/2017] [Accepted: 04/26/2017] [Indexed: 12/28/2022]
Abstract
Glaucoma is a heterogeneous group of diseases characterised by cupping of the optic nerve head and visual-field damage. It is the most frequent cause of irreversible blindness worldwide. Progression usually stops if the intraocular pressure is lowered by 30-50% from baseline. Its worldwide age-standardised prevalence in the population aged 40 years or older is about 3·5%. Chronic forms of glaucoma are painless and symptomatic visual-field defects occur late. Early detection by ophthalmological examination is mandatory. Risk factors for primary open-angle glaucoma-the most common form of glaucoma-include older age, elevated intraocular pressure, sub-Saharan African ethnic origin, positive family history, and high myopia. Older age, hyperopia, and east Asian ethnic origin are the main risk factors for primary angle-closure glaucoma. Glaucoma is diagnosed using ophthalmoscopy, tonometry, and perimetry. Treatment to lower intraocular pressure is based on topical drugs, laser therapy, and surgical intervention if other therapeutic modalities fail to prevent progression.
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Affiliation(s)
- Jost B Jonas
- Department of Ophthalmology, Medical Faculty Mannheim of the Ruprecht-Karls-University of Heidelberg, Heidelberg, Germany.
| | - Tin Aung
- Singapore Eye Research Institute, Singapore; Singapore National Eye Centre, Singapore; Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Rupert R Bourne
- Vision and Eye Research Unit, Anglia Ruskin University, Cambridge, UK
| | - Alain M Bron
- Department of Ophthalmology, University Hospital, Dijon, France; Eye and Nutrition Research Group, Bourgogne Franche-Comté University, Dijon, France
| | - Robert Ritch
- Einhorn Clinical Research Center, New York Eye and Ear Infirmary of Mount Sinai, New York, NY, USA
| | - Songhomitra Panda-Jonas
- Department of Ophthalmology, Medical Faculty Mannheim of the Ruprecht-Karls-University of Heidelberg, Heidelberg, Germany
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Affiliation(s)
- Jonathan Crowston
- Centre for Eye Research Australia, Ophthalmology, Department of Surgery, University of Melbourne, Melbourne, Victoria, Australia
| | - Ian Trounce
- Centre for Eye Research Australia, Ophthalmology, Department of Surgery, University of Melbourne, Melbourne, Victoria, Australia.
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Pilz YL, Bass SJ, Sherman J. A Review of Mitochondrial Optic Neuropathies: From Inherited to Acquired Forms. JOURNAL OF OPTOMETRY 2017; 10:205-214. [PMID: 28040497 PMCID: PMC5595256 DOI: 10.1016/j.optom.2016.09.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 09/02/2016] [Accepted: 09/22/2016] [Indexed: 05/28/2023]
Abstract
In recent years, the term mitochondrial optic neuropathy (MON) has increasingly been used within the literature to describe a group of optic neuropathies that exhibit mitochondrial dysfunction in retinal ganglion cells (RGCs). Interestingly, MONs include genetic aetiologies, such as Leber hereditary optic neuropathy (LHON) and dominant optic atrophy (DOA), as well as acquired aetiologies resulting from drugs, nutritional deficiencies, and mixed aetiologies. Regardless of an inherited or acquired cause, patients exhibit the same clinical manifestations with selective loss of the RGCs due to mitochondrial dysfunction. Various novel therapies are being explored to reverse or limit damage to the RGCs. Here we review the pathophysiology, clinical manifestations, differential diagnosis, current treatment, and promising therapeutic targets of MON.
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MESH Headings
- DNA, Mitochondrial
- Diagnosis, Differential
- Humans
- Mitochondrial Diseases/diagnosis
- Mitochondrial Diseases/genetics
- Mitochondrial Diseases/physiopathology
- Mitochondrial Diseases/therapy
- Optic Atrophy, Autosomal Dominant/diagnosis
- Optic Atrophy, Autosomal Dominant/genetics
- Optic Atrophy, Autosomal Dominant/physiopathology
- Optic Atrophy, Autosomal Dominant/therapy
- Optic Atrophy, Hereditary, Leber/diagnosis
- Optic Atrophy, Hereditary, Leber/genetics
- Optic Atrophy, Hereditary, Leber/physiopathology
- Optic Atrophy, Hereditary, Leber/therapy
- Optic Nerve Diseases/diagnosis
- Optic Nerve Diseases/genetics
- Optic Nerve Diseases/physiopathology
- Optic Nerve Diseases/therapy
- Retinal Ganglion Cells/pathology
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Affiliation(s)
- Yasmine L Pilz
- State University New York, College of Optometry, New York, USA.
| | - Sherry J Bass
- State University New York, College of Optometry, New York, USA
| | - Jerome Sherman
- State University New York, College of Optometry, New York, USA
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Lopez Sanchez MIG, Waugh HS, Tsatsanis A, Wong BX, Crowston JG, Duce JA, Trounce IA. Amyloid precursor protein drives down-regulation of mitochondrial oxidative phosphorylation independent of amyloid beta. Sci Rep 2017; 7:9835. [PMID: 28852095 PMCID: PMC5574989 DOI: 10.1038/s41598-017-10233-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 07/31/2017] [Indexed: 01/04/2023] Open
Abstract
Amyloid precursor protein (APP) and its extracellular domain, soluble APP alpha (sAPPα) play important physiological and neuroprotective roles. However, rare forms of familial Alzheimer’s disease are associated with mutations in APP that increase toxic amyloidogenic cleavage of APP and produce amyloid beta (Aβ) at the expense of sAPPα and other non-amyloidogenic fragments. Although mitochondrial dysfunction has become an established hallmark of neurotoxicity, the link between Aβ and mitochondrial function is unclear. In this study we investigated the effects of increased levels of neuronal APP or Aβ on mitochondrial metabolism and gene expression, in human SH-SY5Y neuroblastoma cells. Increased non-amyloidogenic processing of APP, but not Aβ, profoundly decreased respiration and enhanced glycolysis, while mitochondrial DNA (mtDNA) transcripts were decreased, without detrimental effects to cell growth. These effects cannot be ascribed to Aβ toxicity, since higher levels of endogenous Aβ in our models do not cause oxidative phosphorylation (OXPHOS) perturbations. Similarly, chemical inhibition of β-secretase decreased mitochondrial respiration, suggesting that non-amyloidogenic processing of APP may be responsible for mitochondrial changes. Our results have two important implications, the need for caution in the interpretation of mitochondrial perturbations in models where APP is overexpressed, and a potential role of sAPPα or other non-amyloid APP fragments as acute modulators of mitochondrial metabolism.
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Affiliation(s)
- M Isabel G Lopez Sanchez
- Centre for Eye Research Australia, 75 Commercial Road, Melbourne, 3004, Victoria, Australia.,Department of Surgery, Ophthalmology, University of Melbourne, Victoria, Australia
| | - Hayley S Waugh
- Centre for Eye Research Australia, 75 Commercial Road, Melbourne, 3004, Victoria, Australia.,Department of Surgery, Ophthalmology, University of Melbourne, Victoria, Australia
| | - Andrew Tsatsanis
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, West Yorkshire, LS2 9JT, United Kingdom
| | - Bruce X Wong
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, West Yorkshire, LS2 9JT, United Kingdom.,Oxidation Biology Unit, The Florey Institute of Neuroscience and Mental Health, University of Melbourne, 30 Royal Parade, Parkville, 3052, Victoria, Australia
| | - Jonathan G Crowston
- Centre for Eye Research Australia, 75 Commercial Road, Melbourne, 3004, Victoria, Australia.,Department of Surgery, Ophthalmology, University of Melbourne, Victoria, Australia
| | - James A Duce
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, West Yorkshire, LS2 9JT, United Kingdom.,Oxidation Biology Unit, The Florey Institute of Neuroscience and Mental Health, University of Melbourne, 30 Royal Parade, Parkville, 3052, Victoria, Australia
| | - Ian A Trounce
- Centre for Eye Research Australia, 75 Commercial Road, Melbourne, 3004, Victoria, Australia. .,Department of Surgery, Ophthalmology, University of Melbourne, Victoria, Australia.
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He S, Stankowska DL, Ellis DZ, Krishnamoorthy RR, Yorio T. Targets of Neuroprotection in Glaucoma. J Ocul Pharmacol Ther 2017; 34:85-106. [PMID: 28820649 DOI: 10.1089/jop.2017.0041] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Progressive neurodegeneration of the optic nerve and the loss of retinal ganglion cells is a hallmark of glaucoma, the leading cause of irreversible blindness worldwide, with primary open-angle glaucoma (POAG) being the most frequent form of glaucoma in the Western world. While some genetic mutations have been identified for some glaucomas, those associated with POAG are limited and for most POAG patients, the etiology is still unclear. Unfortunately, treatment of this neurodegenerative disease and other retinal degenerative diseases is lacking. For POAG, most of the treatments focus on reducing aqueous humor formation, enhancing uveoscleral or conventional outflow, or lowering intraocular pressure through surgical means. These efforts, in some cases, do not always lead to a prevention of vision loss and therefore other strategies are needed to reduce or reverse the progressive neurodegeneration. In this review, we will highlight some of the ocular pharmacological approaches that are being tested to reduce neurodegeneration and provide some form of neuroprotection.
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Affiliation(s)
- Shaoqing He
- North Texas Eye Research Institute, University of North Texas Health Science Center , Fort Worth, Texas
| | - Dorota L Stankowska
- North Texas Eye Research Institute, University of North Texas Health Science Center , Fort Worth, Texas
| | - Dorette Z Ellis
- North Texas Eye Research Institute, University of North Texas Health Science Center , Fort Worth, Texas
| | - Raghu R Krishnamoorthy
- North Texas Eye Research Institute, University of North Texas Health Science Center , Fort Worth, Texas
| | - Thomas Yorio
- North Texas Eye Research Institute, University of North Texas Health Science Center , Fort Worth, Texas
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Cobalt inhibits motility of axonal mitochondria and induces axonal degeneration in cultured dorsal root ganglion cells of rat. Cell Biol Toxicol 2017; 34:93-107. [PMID: 28656345 DOI: 10.1007/s10565-017-9402-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2017] [Accepted: 06/15/2017] [Indexed: 10/19/2022]
Abstract
Cobalt is a trace element that localizes in the human body as cobalamin, also known as vitamin B12. Excessive cobalt exposure induces a peripheral neuropathy, the mechanisms of which are yet to be elucidated. We investigated how cobalt may affect mitochondrial motility in primary cultures of rat dorsal root ganglion (DRG). We observed mitochondrial motility by time-lapse imaging after DsRed2 tagging via lentivirus, mitochondrial structure using transmission electron microscopy (TEM), and axonal swelling using immunocytochemical staining. The concentration of cobaltous ion (Co2+) required to significantly suppress mitochondrial motility is lower than that required to induce axonal swelling following a 24-h treatment. Exposure to relatively low concentrations of Co2+ for 48 h suppressed mitochondrial motility without leading to axonal swelling. TEM images indicated that Co2+ induces mitochondrial destruction. Our results show that destruction of the axonal mitochondria precedes the axonal degeneration induced by Co2+ exposure.
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Vetter ML, Hitchcock PF. Report on the National Eye Institute Audacious Goals Initiative: Replacement of Retinal Ganglion Cells from Endogenous Cell Sources. Transl Vis Sci Technol 2017; 6:5. [PMID: 28316878 PMCID: PMC5354473 DOI: 10.1167/tvst.6.2.5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Accepted: 12/30/2016] [Indexed: 12/22/2022] Open
Abstract
This report emerges from a workshop convened by the National Eye Institute (NEI) as part of the "Audacious Goals Initiative" (AGI). The workshop addressed the replacement of retinal ganglion cells (RGCs) from exogenous and endogenous sources, and sought to identify the gaps in our knowledge and barriers to progress in devising cellular replacement therapies for diseases where RGCs die. Here, we briefly review relevant literature regarding common diseases associated with RGC death, the genesis of RGCs in vivo, strategies for generating transplantable RGCs in vitro, and potential endogenous cellular sources to regenerate these cells. These topics provided the clinical and scientific context for the discussion among the workshop participants and are relevant to efforts that may lead to therapeutic approaches for replacing RGCs. This report also summarizes the content of the workshop discussion, which focused on: (1) cell sources for RGC replacement and regeneration, (2) optimizing integration, survival, and synaptogenesis of new RGCs, and (3) approaches for assessing the outcomes of RGC replacement therapies. We conclude this report with a summary of recommendations, based on the workshop discussions, which may guide vision scientists seeking to develop therapies for replacing RGCs in humans.
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Affiliation(s)
- Monica L Vetter
- Department of Neurobiology and Anatomy, University of Utah, Salt Lake City, UT, USA
| | - Peter F Hitchcock
- Department of Neurobiology and Anatomy, University of Utah, Salt Lake City, UT, USA ; Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, MI, USA
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Diagnosis and Management of Mitochondrial Neuro-Ophthalmologic Disorders: Translating Scientific Advances Into the Clinic. J Neuroophthalmol 2017; 37:65-69. [PMID: 28187083 DOI: 10.1097/wno.0000000000000471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Keck F, Brooks-Faulconer T, Lark T, Ravishankar P, Bailey C, Salvador-Morales C, Narayanan A. Altered mitochondrial dynamics as a consequence of Venezuelan Equine encephalitis virus infection. Virulence 2017; 8:1849-1866. [PMID: 28075229 DOI: 10.1080/21505594.2016.1276690] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Mitochondria are sentinel organelles that are impacted by various forms of cellular stress, including viral infections. While signaling events associated with mitochondria, including those activated by pathogen associated molecular patterns (PAMPs), are widely studied, alterations in mitochondrial distribution and changes in mitochondrial dynamics are also beginning to be associated with cellular insult. Cells of neuronal origin have been demonstrated to display remarkable alterations in several instances, including neurodegenerative disorders. Venezuelan Equine Encephalitis Virus (VEEV) is a New World alphavirus that infects neuronal cells and contributes to an encephalitic phenotype. We demonstrate that upon infection by the vaccine strain of VEEV (TC-83), astrocytoma cells experience a robust drop in mitochondrial activity, which corresponds with an increased accumulation of reactive oxygen species (ROS) in an infection-dependent manner. Infection status also corresponds with a prominent perinuclear accumulation of mitochondria. Cellular enzymatic machinery, including PINK1 and Parkin, appears to be enriched in mitochondrial fractions as compared with uninfected cells, which is indicative of mitochondrial damage. Dynamin related protein 1 (Drp1), a protein that is associated with mitochondrial fission, demonstrated a modest enrichment in mitochondrial fractions of infected cells. Treatment with an inhibitor of mitochondrial fission, Mdivi-1, led to a decrease in caspase cleavage, suggesting that mitochondrial fission was likely to contribute to apoptosis of infected cells. Finally, our data demonstrate that mitophagy ensues in infected cells. In combination, our data suggest that VEEV infection results in significant changes in the mitochondrial landscape that may influence pathological outcomes in the infected cell.
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Affiliation(s)
- Forrest Keck
- a National Center for Biodefense and Infectious Diseases, School of Systems Biology, George Mason University , Manassas , VA , USA
| | - Taryn Brooks-Faulconer
- a National Center for Biodefense and Infectious Diseases, School of Systems Biology, George Mason University , Manassas , VA , USA
| | - Tyler Lark
- a National Center for Biodefense and Infectious Diseases, School of Systems Biology, George Mason University , Manassas , VA , USA
| | | | - Charles Bailey
- a National Center for Biodefense and Infectious Diseases, School of Systems Biology, George Mason University , Manassas , VA , USA
| | | | - Aarthi Narayanan
- a National Center for Biodefense and Infectious Diseases, School of Systems Biology, George Mason University , Manassas , VA , USA
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Abstract
The report in 1988 that Leber Hereditary Optic Neuropathy (LHON) was the product of mitochondrial DNA (mtDNA) mutations provided the first demonstration of the clinical relevance of inherited mtDNA variation. From LHON studies, the medical importance was demonstrated for the mtDNA showing its coding for the most important energy genes, its maternal inheritance, its high mutation rate, its presence in hundreds to thousands of copies per cell, its quantitatively segregation of biallelic genotypes during both mitosis and meiosis, its preferential effect on the most energetic tissues including the eye and brain, its wide range of functional polymorphisms that predispose to common diseases, and its accumulation of mutations within somatic tissues providing the aging clock. These features of mtDNA genetics, in combination with the genetics of the 1-2000 nuclear DNA (nDNA) coded mitochondrial genes, is not only explaining the genetics of LHON but also providing a model for understanding the complexity of many common diseases. With the maturation of LHON biology and genetics, novel animal models for complex disease have been developed and new therapeutic targets and strategies envisioned, both pharmacological and genetic. Multiple somatic gene therapy approaches are being developed for LHON which are applicable to other mtDNA diseases. Moreover, the unique cytoplasmic genetics of the mtDNA has permitted the first successful human germline gene therapy via spindle nDNA transfer from mtDNA mutant oocytes to enucleated normal mtDNA oocytes. Such LHON lessons are actively being applied to common ophthalmological diseases like glaucoma and neurological diseases like Parkinsonism.
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Mysona BA, Zhao J, Bollinger KE. Role of BDNF/TrkB pathway in the visual system: Therapeutic implications for glaucoma. EXPERT REVIEW OF OPHTHALMOLOGY 2016; 12:69-81. [PMID: 28751923 DOI: 10.1080/17469899.2017.1259566] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
INTRODUCTION Neuroprotective therapeutics are needed to treat glaucoma, an optic neuropathy that results in death of retinal ganglion cells (RGCs). AREAS COVERED The BDNF/TrkB pathway is important for RGC survival. Temporal and spatial alterations in the BDNF/TrkB pathway occur in development and in response to acute optic nerve injury and to glaucoma. In animal models, BDNF supplementation is successful at slowing RGC death after acute optic nerve injury and in glaucoma, however, the BDNF/TrkB signaling is not the only pathway supporting long term RGC survival. EXPERT COMMENTARY Much remains to be discovered about the interaction between retrograde, anterograde, and retinal BDNF/TrkB signaling pathways in both neurons and glia. An ideal therapeutic agent for glaucoma likely has several modes of action that target multiple mechanisms of neurodegeneration including the BDNF/TrkB pathway.
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Affiliation(s)
- B A Mysona
- Augusta University Department of Cellular Biology and Anatomy, James and Jean Culver Vision Discovery Institute. Address: Augusta University Department of Cellular Biology and Anatomy, Health Sciences Campus, 1120 15th Street, Augusta, GA 30912, USA,
| | - J Zhao
- Medical College of Georgia, Department of Ophthalmology at Augusta University, James and Jean Culver Vision Discovery Institute. Address: Medical College of Georgia, Department of Ophthalmology at Augusta University, 1120 15th Street, Augusta, GA 30912, USA,
| | - K E Bollinger
- Medical College of Georgia, Department of Ophthalmology at Augusta University, Augusta University Department of Cellular Biology and Anatomy, James and Jean Culver Vision Discovery Institute. Address: Medical College of Georgia, Department of Ophthalmology at Augusta University, 1120 15th Street, Augusta, GA 30912, USA,
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