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Kampmann M. Molecular and cellular mechanisms of selective vulnerability in neurodegenerative diseases. Nat Rev Neurosci 2024; 25:351-371. [PMID: 38575768 DOI: 10.1038/s41583-024-00806-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/01/2024] [Indexed: 04/06/2024]
Abstract
The selective vulnerability of specific neuronal subtypes is a hallmark of neurodegenerative diseases. In this Review, I summarize our current understanding of the brain regions and cell types that are selectively vulnerable in different neurodegenerative diseases and describe the proposed underlying cell-autonomous and non-cell-autonomous mechanisms. I highlight how recent methodological innovations - including single-cell transcriptomics, CRISPR-based screens and human cell-based models of disease - are enabling new breakthroughs in our understanding of selective vulnerability. An understanding of the molecular mechanisms that determine selective vulnerability and resilience would shed light on the key processes that drive neurodegeneration and point to potential therapeutic strategies to protect vulnerable cell populations.
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Affiliation(s)
- Martin Kampmann
- Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA, USA.
- Institute for Neurodegenerative Diseases, University of California, San Francisco, San Francisco, CA, USA.
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Lee DW, Ryu YK, Chang DH, Park HY, Go J, Maeng SY, Hwang DY, Kim BC, Lee CH, Kim KS. Agathobaculum butyriciproducens Shows Neuroprotective Effects in a 6-OHDA-Induced Mouse Model of Parkinson's Disease. J Microbiol Biotechnol 2022; 32:1168-1177. [PMID: 36168204 PMCID: PMC9628974 DOI: 10.4014/jmb.2205.05032] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 08/23/2022] [Accepted: 08/29/2022] [Indexed: 12/15/2022]
Abstract
Parkinson's disease (PD) is the second-most prevalent neurodegenerative disease and is characterized by dopaminergic neuronal death in the midbrain. Recently, the association between alterations in PD pathology and the gut microbiota has been explored. Microbiota-targeted interventions have been suggested as a novel therapeutic approach for PD. Agathobaculum butyriciproducens SR79T (SR79) is an anaerobic bacterium. Previously, we showed that SR79 treatment induced cognitive improvement and reduced Alzheimer's disease pathologies in a mouse model. In this study, we hypothesized that SR79 treatment may have beneficial effects on PD pathology. To investigate the therapeutic effects of SR79 on PD, 6-hydroxydopamine (6-OHDA)-induced mouse models were used. D-Amphetamine sulfate (d-AMPH)-induced behavioral rotations and dopaminergic cell death were analyzed in unilateral 6-OHDA-lesioned mice. Treatment with SR79 significantly decreased ipsilateral rotations induced by d-AMPH. Moreover, SR79 treatment markedly activated the AKT/GSK3β signaling pathway in the striatum. In addition, SR79 treatment affected the Nrf2/ARE signaling pathway and its downstream target genes in the striatum of 6-OHDA-lesioned mice. Our findings suggest a protective role of SR79 in 6-OHDA-induced toxicity by regulating the AKT/Nrf2/ARE signaling pathway and astrocyte activation. Thus, SR79 may be a potential microbe-based intervention and therapeutic strategy for PD.
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Affiliation(s)
- Da Woon Lee
- Laboratory Animal Resource Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea,Department of Biomaterials Science, College of Natural Resources and Life Science and Industry Convergence Research Institute, Pusan National University, Miryang 50463, Republic of Korea
| | - Young-Kyoung Ryu
- Laboratory Animal Resource Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea
| | - Dong-Ho Chang
- Microbiome Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea
| | - Hye-Yeon Park
- Laboratory Animal Resource Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea
| | - Jun Go
- Laboratory Animal Resource Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea
| | - So-Young Maeng
- Laboratory Animal Resource Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea,College of Biosciences and Biotechnology, Chung-Nam National University, Daejeon 34134, Republic of Korea
| | - Dae Youn Hwang
- Department of Biomaterials Science, College of Natural Resources and Life Science and Industry Convergence Research Institute, Pusan National University, Miryang 50463, Republic of Korea
| | - Byoung-Chan Kim
- Microbiome Convergence Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea,HealthBiome, Inc., Daejeon 34141, Republic of Korea
| | - Chul-Ho Lee
- Laboratory Animal Resource Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea,Department of Biosystems and Bioengineering, University of Science and Technology (UST), Daejeon 34113, Republic of Korea,Corresponding authors C.H. Lee E-mail:
| | - Kyoung-Shim Kim
- Laboratory Animal Resource Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Republic of Korea,
K.S. Kim Phone: 82-42-860-4634 Fax : 82-42-860-4609 E-mail:
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Xu X, He X, Zhang Z, Chen Y, Li J, Ma S, Huang Q, Li M. CREB Inactivation by HDAC1/PP1γ Contributes to Dopaminergic Neurodegeneration in Parkinson's Disease. J Neurosci 2022; 42:4594-4604. [PMID: 35501151 PMCID: PMC9172078 DOI: 10.1523/jneurosci.1419-21.2022] [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: 07/10/2021] [Revised: 04/19/2022] [Accepted: 04/21/2022] [Indexed: 11/21/2022] Open
Abstract
Understanding the pathogenesis of nigral dopaminergic neurodegeneration is critical for developing mechanism-based treatments for Parkinson's disease (PD). In the nigral dopaminergic neurons of postmortem human PD brains, we found that CREB, a well-recognized pro-survival transcription factor in neurons, was inactivated by dephosphorylation at Ser133. CREB dephosphorylation correlated with decreased expression of NURR1, one of its target genes crucial for dopaminergic neuron survival, confirming that CREB function was impaired in nigral dopaminergic neurons in PD. An MPTP mouse model was used to further elucidate the mechanism underlying CREB dephosphorylation. Protein phosphatase 1γ (PP1γ), which dephosphorylates CREB, was constitutively associated with histone deacetylase 1 (HDAC1). HDAC1 promotes CREB Ser133 dephosphorylation via a stable interaction with PP1γ. We found that CREB interacted with the HDAC1/PP1γ complex during dopaminergic neurodegeneration. Importantly, increased CREB/HDAC1 interaction occurred in the nigral dopaminergic neurons of PD patients as demonstrated using a proximity ligation assay. Disrupting CREB/HDAC1 interaction via either overexpression of GAL4 M1, a CREB mutant, or administration of trichostatin A, a pan-HDAC inhibitor, restored the expression levels of phospho-CREB (Ser133) and NURR1, and protected nigral dopaminergic neurons in the MPTP-treated mouse brain. Collectively, our results demonstrated that HDAC1/PP1γ-mediated CREB inactivation contributed to dopaminergic neuronal degeneration. Disruption of CREB/HDAC1 interaction has the potential to be a new approach for PD therapy.SIGNIFICANCE STATEMENT Parkinson's disease (PD) is the most common movement disorder attributed to the progressive loss of dopaminergic neurons in the substantia nigra. Understanding the pathogenesis of nigral dopaminergic neurodegeneration is critical for developing mechanism-based treatments for PD. We found in nigral dopaminergic neurons of postmortem human PD brains that CREB, a well-recognized pro-survival transcription factor in neurons, was inactivated by dephosphorylation at Ser133. HDAC1, constitutively associated with PP1γ, interacted with CREB to mediate its dephosphorylation during dopaminergic neurodegeneration. Disrupting CREB/HDAC1 interaction restored CREB activity and protected nigral dopaminergic neurons in the MPTP mouse brains. This work suggests that disruption of the CREB/HDAC1 interaction to restore CREB activity may be a potential therapeutic approach in PD.
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Affiliation(s)
- Xiaoyi Xu
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Xin He
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Zeyan Zhang
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Yanyi Chen
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Junyu Li
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Shanshan Ma
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Qiaoying Huang
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
| | - Mingtao Li
- Guangdong Provincial Key Laboratory of Brain Function and Disease and Department of Pharmacology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China
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Subthalamic nucleus deep brain stimulation protects neurons by activating autophagy via PP2A inactivation in a rat model of Parkinson's disease. Exp Neurol 2018; 306:232-242. [DOI: 10.1016/j.expneurol.2018.05.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2018] [Revised: 05/11/2018] [Accepted: 05/15/2018] [Indexed: 12/29/2022]
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Kauko O, Westermarck J. Non-genomic mechanisms of protein phosphatase 2A (PP2A) regulation in cancer. Int J Biochem Cell Biol 2018; 96:157-164. [DOI: 10.1016/j.biocel.2018.01.005] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Revised: 12/03/2017] [Accepted: 01/09/2018] [Indexed: 02/08/2023]
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Kim H, Kang H, Lee Y, Park CH, Jo A, Khang R, Shin JH. Identification of transketolase as a target of PARIS in substantia nigra. Biochem Biophys Res Commun 2017; 493:1050-1056. [PMID: 28939041 DOI: 10.1016/j.bbrc.2017.09.090] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 09/15/2017] [Indexed: 11/18/2022]
Abstract
Recently, PARIS (ZNF746) is introduced as authentic substrate of parkin and transcriptionally represses PGC-1α by binding to insulin responsive sequences (IRSs) in the promoter of PGC-1α. The overexpression of PARIS selectively leads to the loss of dopaminergic neurons (DN) and mitochondrial abnormalities in the substantia nigra (SN) of Parkinson's disease (PD) models. To identify PARIS target molecules altered in SN region-specific manner, LC-MS/MS-based quantitative proteomic analysis is employed to investigate proteomic alteration in the cortex, striatum, and SN of AAV-PARIS injected mice. Herein, we find that the protein and mRNA of transketolase (TKT), a key enzyme in pentose phosphate pathway (PPP) of glucose metabolism, is exclusively decreased in the SN of AAV-PARIS mice. PARIS overexpression suppresses TKT transcription via IRS-like motif in the TKT promoter. Moreover, the reduction of TKT by PARIS is found in primary DN but not in cortical neurons, suggesting that PARIS-medicated TKT suppression is cell type-dependent. Interestingly, we observe the reduced level of TKT in the SN of PD patients but not in the cortex. These findings indicate that TKT might be a SN-specific target of PARIS, providing new clues to understand the mechanism underlying selective DNs death in PD.
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Affiliation(s)
- Hyein Kim
- Division of Pharmacology, Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon 440-746, South Korea; HuGeX Co., Ltd., Seongnam 462-122, South Korea
| | - Hojin Kang
- Division of Pharmacology, Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon 440-746, South Korea
| | - Yunjong Lee
- Division of Pharmacology, Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon 440-746, South Korea; Samsung Medical Center (SMC), Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon, South Korea
| | - Chi-Hu Park
- HuGeX Co., Ltd., Seongnam 462-122, South Korea
| | - Areum Jo
- Division of Pharmacology, Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon 440-746, South Korea
| | - Rin Khang
- Division of Pharmacology, Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon 440-746, South Korea
| | - Joo-Ho Shin
- Division of Pharmacology, Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon 440-746, South Korea; Samsung Medical Center (SMC), Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon, South Korea.
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Tien LT, Lee YJ, Pang Y, Lu S, Lee JW, Tseng CH, Bhatt AJ, Savich RD, Fan LW. Neuroprotective Effects of Intranasal IGF-1 against Neonatal Lipopolysaccharide-Induced Neurobehavioral Deficits and Neuronal Inflammation in the Substantia Nigra and Locus Coeruleus of Juvenile Rats. Dev Neurosci 2017; 39:443-459. [PMID: 28787734 PMCID: PMC5799046 DOI: 10.1159/000477898] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 05/30/2017] [Indexed: 01/29/2023] Open
Abstract
Neonatal lipopolysaccharide (LPS) exposure-induced brain inflammation resulted in motor dysfunction and brain dopaminergic neuronal injury, and increased the risks of neurodegenerative disorders in adult rats. Our previous studies showed that intranasal administration of insulin-like growth factor-1 (IGF-1) protects against LPS-induced white matter injury in the developing rat brain. To further examine whether IGF-1 protects against LPS-induced brain neuronal injury and neurobehavioral dysfunction, recombinant human IGF-1 (rhIGF-1) at a dose of 50 µg/pup was administered intranasally 1 h following intracerebral injection of LPS (1 mg/kg) in postnatal day 5 (P5) Sprague-Dawley rat pups. Neurobehavioral tests were carried out from P7 to P21, and brain neuronal injury was examined at P21. Our results showed that LPS exposure resulted in disturbances of motor behaviors in juvenile rats. Moreover, LPS exposure caused injury to central catecholaminergic neurons, as indicated by a reduction of tyrosine hydroxylase (TH) immunoreactivity in the substantia nigra (SN), ventral tegmental area (VTA) and olfactory bulb (OB), and brain noradrenergic neurons, as indicated by a reduction of TH immunoreactivity in the locus coeruleus (LC) of the P21 rat brain. The LPS-induced reduction of TH+ cells was observed at a greater degree in the SN and LC of the P21 rat brain. Intranasal rhIGF-1 treatment attenuated LPS-induced central catecholaminergic neuronal injury and motor behavioral disturbances, including locomotion, beam walking test and gait analysis. Intranasal rhIGF-1 administration also attenuated LPS-induced elevation of IL-1β levels and numbers of activated microglia, and cyclooxygenase-2+ cells, which were double labeled with TH+ cells in the SN, VTA, OB and LC of the P21 rat brain. These results suggest that IGF-1 may provide protection against neonatal LPS exposure-induced central catecholaminergic neuronal injury and motor behavioral disturbances, and that the protective effects are associated with the inhibition of microglia activation and the reduction of neuronal oxidative stress by the suppression of the neuronal cyclooxygenase-2 expression.
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Affiliation(s)
- Lu-Tai Tien
- School of Medicine, Fu Jen Catholic University, Xinzhuang Dist, New Taipei City 24205, Taiwan
| | - Yih-Jing Lee
- School of Medicine, Fu Jen Catholic University, Xinzhuang Dist, New Taipei City 24205, Taiwan
| | - Yi Pang
- Department of Pediatrics, Division of Newborn Medicine, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Silu Lu
- Department of Pediatrics, Division of Newborn Medicine, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Jonathan W Lee
- Department of Pediatrics, Division of Newborn Medicine, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Chih-Hsueh Tseng
- School of Medicine, Fu Jen Catholic University, Xinzhuang Dist, New Taipei City 24205, Taiwan
| | - Abhay J Bhatt
- Department of Pediatrics, Division of Newborn Medicine, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Renate D Savich
- Department of Pediatrics, Division of Newborn Medicine, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Lir-Wan Fan
- Department of Pediatrics, Division of Newborn Medicine, University of Mississippi Medical Center, Jackson, MS 39216, USA
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Dutta D, Ali N, Banerjee E, Singh R, Naskar A, Paidi RK, Mohanakumar KP. Low Levels of Prohibitin in Substantia Nigra Makes Dopaminergic Neurons Vulnerable in Parkinson's Disease. Mol Neurobiol 2017; 55:804-821. [PMID: 28062948 DOI: 10.1007/s12035-016-0328-y] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 11/29/2016] [Indexed: 12/18/2022]
Abstract
Since substantia nigra (SN) and ventral tegmental area (VTA) dopaminergic neurons are, respectively, susceptible or largely unaffected in Parkinson's disease (PD), we searched for protein(s) that regulates this differential sensitivity. Differentially, expressed proteins in SN and VTA were investigated employing two-directional gel electrophoresis- matrix-assisted laser desorption ionization time of flight (MALDI-TOF-TOF) analyses. Prohibitin, which is involved in mitochondrial integrity, was validated using immunoblot, qRT-PCR, and immunohistochemistry in normal mice as well as 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-model, PD postmortem human brains, and PD cybrids. In prohibitin over-expression, differentiated SH-SY5Y neurons were investigated for their susceptibility to PD neurotoxin, 1-methyl-4-phenyl-pyridnium (MPP+). Prohibitin, Hsc73, and Cu-Zn superoxide dismutase (Cu-Zn SOD) were highly expressed in VTA, whereas heat shock protein A8 (HSPA8) and 14-3-3ζ/δ were 2-fold more in SN. Prohibitin level was transiently increased in SN but unaltered in VTA on the third day of MPTP-induced mice, whereas in PD human brains, prohibitin was depleted in both these regions. Parallel to mouse SN, an enhanced prohibitin expression was found in human PD cybrids. In MPP+-induced cellular model of PD, reduction in prohibitin level was found to be associated with a loss in its binding with Ndufs3, a mitochondrial complex I protein partner. Prohibitin over-expression resisted MPP+-induced neuronal death by restoring mitochondrial membrane potential, preventing reactive oxygen species generation and cytochrome c release into cytosol. These protective phenomena exerted by prohibitin over-expression altogether hinder caspase 3 activation induced by MPP+. These results imply that prohibitin is an important negotiator protein that regulates dopaminergic cell death in SN and their protection in VTA in PD.
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Affiliation(s)
- Debashis Dutta
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Nilufar Ali
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Emili Banerjee
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Raghavendra Singh
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Amit Naskar
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Ramesh Kumar Paidi
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India
| | - Kochupurackal P Mohanakumar
- Laboratory of Clinical and Experimental Neuroscience, Division of Cell Biology and Physiology, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata, 700 032, India. .,Inter University Centre for Biomedical Research and Super Speciality Hospital, Mahatma Gandhi University Campus at Thalappady, Rubber Board P.O, Kottayam, Kerala, 686009, India.
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Anderegg A, Poulin JF, Awatramani R. Molecular heterogeneity of midbrain dopaminergic neurons--Moving toward single cell resolution. FEBS Lett 2015; 589:3714-26. [PMID: 26505674 DOI: 10.1016/j.febslet.2015.10.022] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 10/19/2015] [Accepted: 10/19/2015] [Indexed: 12/31/2022]
Abstract
Since their discovery, midbrain dopamine (DA) neurons have been researched extensively, in part because of their diverse functions and involvement in various neuropsychiatric disorders. Over the last few decades, reports have emerged that midbrain DA neurons were not a homogeneous group, but that DA neurons located in distinct anatomical locations within the midbrain had distinctive properties in terms of physiology, function, and vulnerability. Accordingly, several studies focused on identifying heterogeneous gene expression across DA neuron clusters. Here we review the importance of understanding DA neuron heterogeneity at the molecular level, previous studies detailing heterogeneous gene expression in DA neurons, and finally recent work which brings together previous heterogeneous gene expression profiles in a coordinated manner, at single cell resolution.
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Affiliation(s)
- Angela Anderegg
- Department of Neurology and Center for Genetic Medicine, Northwestern University, Chicago, IL 60611, United States
| | - Jean-Francois Poulin
- Department of Neurology and Center for Genetic Medicine, Northwestern University, Chicago, IL 60611, United States
| | - Rajeshwar Awatramani
- Department of Neurology and Center for Genetic Medicine, Northwestern University, Chicago, IL 60611, United States
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de Pedro N, Cantizani J, Ortiz-López FJ, González-Menéndez V, Cautain B, Rodríguez L, Bills GF, Reyes F, Genilloud O, Vicente F. Protective effects of isolecanoric acid on neurodegenerative in vitro models. Neuropharmacology 2015; 101:538-48. [PMID: 26455662 DOI: 10.1016/j.neuropharm.2015.09.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Revised: 09/23/2015] [Accepted: 09/25/2015] [Indexed: 12/13/2022]
Abstract
Parkinson's disease (PD) and Amyotrophic lateral sclerosis (ALS), are neurodegenerative disorders characterized by loss of dopaminergic or motor neurons, respectively. Although understanding of the PD and ALS pathogenesis remains incomplete, increasing evidence from human and animal studies has suggested that aberrant GSK3β, oxidative stress and mitochondrial damage are involved in their pathogenesis. Using two different molecular models, treatment with L-BMAA for ALS and rotenone for PD the effect of isolecanoric acid, a natural product isolated from a fungal culture, was evaluated. Pre-treatment with this molecule caused inhibition of GSK3β and CK1, and a decrease in oxidative stress, mitochondrial damage, apoptosis and cell death. Taken together, these results indicated that isolecanoric acid might have a protective effect against the development of these neurodegenerative disorders.
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Affiliation(s)
- Nuria de Pedro
- Fundación MEDINA, Parque Tecnológico Ciencias de la Salud, Avda. Conocimiento 34, 18016 Granada, Spain.
| | - Juan Cantizani
- Fundación MEDINA, Parque Tecnológico Ciencias de la Salud, Avda. Conocimiento 34, 18016 Granada, Spain
| | | | - Victor González-Menéndez
- Fundación MEDINA, Parque Tecnológico Ciencias de la Salud, Avda. Conocimiento 34, 18016 Granada, Spain
| | - Bastien Cautain
- Fundación MEDINA, Parque Tecnológico Ciencias de la Salud, Avda. Conocimiento 34, 18016 Granada, Spain
| | - Lorena Rodríguez
- Fundación MEDINA, Parque Tecnológico Ciencias de la Salud, Avda. Conocimiento 34, 18016 Granada, Spain
| | - Gerald F Bills
- Texas Therapeutics Institute, University of Texas Health Science Center at Houston, United States
| | - Fernando Reyes
- Fundación MEDINA, Parque Tecnológico Ciencias de la Salud, Avda. Conocimiento 34, 18016 Granada, Spain
| | - Olga Genilloud
- Fundación MEDINA, Parque Tecnológico Ciencias de la Salud, Avda. Conocimiento 34, 18016 Granada, Spain
| | - Francisca Vicente
- Fundación MEDINA, Parque Tecnológico Ciencias de la Salud, Avda. Conocimiento 34, 18016 Granada, Spain
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Chabrat A, Doucet-Beaupré H, Lévesque M. RNA Isolation from Cell Specific Subpopulations Using Laser-capture Microdissection Combined with Rapid Immunolabeling. J Vis Exp 2015:52510. [PMID: 25939046 PMCID: PMC4541564 DOI: 10.3791/52510] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Laser capture microdissection (LCM) allows the isolation of specific cells from thin tissue sections with high spatial resolution. Effective LCM requires precise identification of cells subpopulations from a heterogeneous tissue. Identification of cells of interest for LCM is usually based on morphological criteria or on fluorescent protein reporters. The combination of LCM and rapid immunolabeling offers an alternative and efficient means to visualize specific cell types and to isolate them from surrounding tissue. High-quality RNA can then be extracted from a pure cell population and further processed for downstream applications, including RNA-sequencing, microarray or qRT-PCR. This approach has been previously performed and briefly described in few publications. The goal of this article is to illustrate how to perform rapid immunolabeling of a cell population while keeping RNA integrity, and how to isolate these specific cells using LCM. Herein, we illustrated this multi-step procedure by immunolabeling and capturing dopaminergic cells in brain tissue from one-day-old mice. We highlight key critical steps that deserve special consideration. This protocol can be adapted to a variety of tissues and cells of interest. Researchers from different fields will likely benefit from the demonstration of this approach.
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Affiliation(s)
- Audrey Chabrat
- Department of Psychiatry and Neurosciences, Faculty of Medicine, Université Laval; Centre de recherche de l'Institut universitaire en santé mentale de Québec
| | - Hélène Doucet-Beaupré
- Department of Psychiatry and Neurosciences, Faculty of Medicine, Université Laval; Centre de recherche de l'Institut universitaire en santé mentale de Québec
| | - Martin Lévesque
- Department of Psychiatry and Neurosciences, Faculty of Medicine, Université Laval; Centre de recherche de l'Institut universitaire en santé mentale de Québec;
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Brichta L, Greengard P. Molecular determinants of selective dopaminergic vulnerability in Parkinson's disease: an update. Front Neuroanat 2014; 8:152. [PMID: 25565977 PMCID: PMC4266033 DOI: 10.3389/fnana.2014.00152] [Citation(s) in RCA: 137] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Accepted: 11/24/2014] [Indexed: 11/25/2022] Open
Abstract
Numerous disorders of the central nervous system (CNS) are attributed to the selective death of distinct neuronal cell populations. Interestingly, in many of these conditions, a specific subset of neurons is extremely prone to degeneration while other, very similar neurons are less affected or even spared for many years. In Parkinson’s disease (PD), the motor manifestations are primarily linked to the selective, progressive loss of dopaminergic (DA) neurons in the substantia nigra pars compacta (SNpc). In contrast, the very similar DA neurons in the ventral tegmental area (VTA) demonstrate a much lower degree of degeneration. Elucidating the molecular mechanisms underlying the phenomenon of differential DA vulnerability in PD has proven extremely challenging. Moreover, an increasing number of studies demonstrate that considerable molecular and electrophysiologic heterogeneity exists among the DA neurons within the SNpc as well as those within the VTA, adding yet another layer of complexity to the selective DA vulnerability observed in PD. The discovery of key pathways that regulate this differential susceptibility of DA neurons to degeneration holds great potential for the discovery of novel drug targets and the development of promising neuroprotective treatment strategies. This review provides an update on the molecular basis of the differential vulnerability of midbrain DA neurons in PD and highlights the most recent developments in this field.
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Affiliation(s)
- Lars Brichta
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University New York, NY, USA
| | - Paul Greengard
- Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University New York, NY, USA
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Firing Pattern Modulation Through SK Channel Current Increase Underlies Neuronal Survival in an Organotypic Slice Model of Parkinson’s Disease. Mol Neurobiol 2014; 51:424-36. [DOI: 10.1007/s12035-014-8728-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Accepted: 04/29/2014] [Indexed: 12/28/2022]
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14
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Adami R, Scesa G, Bottai D. Stem cell transplantation in neurological diseases: improving effectiveness in animal models. Front Cell Dev Biol 2014; 2:17. [PMID: 25364724 PMCID: PMC4206985 DOI: 10.3389/fcell.2014.00017] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Accepted: 04/22/2014] [Indexed: 12/14/2022] Open
Abstract
Neurological diseases afflict a growing proportion of the human population. There are two reasons for this: first, the average age of the population (especially in the industrialized world) is increasing, and second, the diagnostic tools to detect these pathologies are now more sophisticated and can be used on a higher percentage of the population. In many cases, neurological disease has a pharmacological treatment which, as in the case of Alzheimer's disease, Parkinson's disease, Epilepsy, and Multiple Sclerosis can reduce the symptoms and slow down the course of the disease but cannot reverse its effects or heal the patient. In the last two decades the transplantation approach, by means of stem cells of different origin, has been suggested for the treatment of neurological diseases. The choice of slightly different animal models and the differences in methods of stem cell preparation make it difficult to compare the results of transplantation experiments. Moreover, the translation of these results into clinical trials with human subjects is difficult and has so far met with little success. This review seeks to discuss the reasons for these difficulties by considering the differences between human and animal cells (including isolation, handling and transplantation) and between the human disease model and the animal disease model.
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Affiliation(s)
- Raffaella Adami
- Department of Health Science, Faculty of Medicine, University of Milan Milan, Italy
| | - Giuseppe Scesa
- Department of Health Science, Faculty of Medicine, University of Milan Milan, Italy
| | - Daniele Bottai
- Department of Health Science, Faculty of Medicine, University of Milan Milan, Italy
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15
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Gong L, Zhang QL, Zhang N, Hua WY, Huang YX, Di PW, Huang T, Xu XS, Liu CF, Hu LF, Luo WF. Neuroprotection by urate on 6-OHDA-lesioned rat model of Parkinson's disease: linking to Akt/GSK3β signaling pathway. J Neurochem 2012; 123:876-85. [PMID: 23094836 DOI: 10.1111/jnc.12038] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 09/12/2012] [Accepted: 09/25/2012] [Indexed: 11/26/2022]
Affiliation(s)
- Li Gong
- Department of Neurology; The Second Affiliated Hospital of Soochow University; Suzhou China
- Institute of Neuroscience; Soochow University; Suzhou China
| | - Qi-Lin Zhang
- Department of Neurology; The Second Affiliated Hospital of Soochow University; Suzhou China
| | - Ning Zhang
- Department of Neurology; The Second Affiliated Hospital of Soochow University; Suzhou China
- Institute of Neuroscience; Soochow University; Suzhou China
| | - Wen-Yan Hua
- Department of Pharmacy; The Second Affiliated Hospital of Soochow University; Suzhou China
| | - Yi-Xian Huang
- Department of Neurology; The Second Affiliated Hospital of Soochow University; Suzhou China
| | - Ping-Wei Di
- Department of Neurology; The Second Affiliated Hospital of Soochow University; Suzhou China
| | - Tingting Huang
- Department of Neurology; The Second Affiliated Hospital of Soochow University; Suzhou China
| | - Xing-Shun Xu
- Department of Neurology; The Second Affiliated Hospital of Soochow University; Suzhou China
- Institute of Neuroscience; Soochow University; Suzhou China
| | - Chun-Feng Liu
- Department of Neurology; The Second Affiliated Hospital of Soochow University; Suzhou China
- Institute of Neuroscience; Soochow University; Suzhou China
| | - Li-Fang Hu
- Department of Neurology; The Second Affiliated Hospital of Soochow University; Suzhou China
- Institute of Neuroscience; Soochow University; Suzhou China
| | - Wei-Feng Luo
- Department of Neurology; The Second Affiliated Hospital of Soochow University; Suzhou China
- Institute of Neuroscience; Soochow University; Suzhou China
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16
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G-substrate: the cerebellum and beyond. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2012; 106:381-416. [PMID: 22340725 DOI: 10.1016/b978-0-12-396456-4.00004-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The discovery of nitric oxide (NO) as an activator of soluble guanylate cyclase (sGC) has stimulated extensive research on the NO-sGC-3':5'-cyclic guanosine monophosphate (cGMP)-cGMP-dependent protein kinase (PKG) pathway. However, the restricted localization of pathway components and the lack of information on PKG substrates have hindered research seeking to examine the physiological roles of the NO-sGC-cGMP-PKG pathway. An excellent substrate for PKG is the G-substrate, which was originally discovered in the cerebellum. The role of G-substrate in the cerebellum and other brain structures has been revealed in recent years. This review discusses the relationship between the G-substrate and other components of the NO-sGC-cGMP-PKG pathway and describes the characteristics of the G-substrate gene and protein related to diseases. Finally, we discuss the physiological role of G-substrate in the cerebellum, where it regulates cerebellum-dependent long-term memory, and its role in the ventral tegmental area and retina, where it acts as an effective neuroprotectant.
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Durgadoss L, Nidadavolu P, Valli RK, Saeed U, Mishra M, Seth P, Ravindranath V. Redox modification of Akt mediated by the dopaminergic neurotoxin MPTP, in mouse midbrain, leads to down‐regulation of pAkt. FASEB J 2011; 26:1473-83. [DOI: 10.1096/fj.11-194100] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Lalitha Durgadoss
- Division of Molecular and Cellular NeurosciencesNational Brain Research CentreNainwal ModeManesarIndia
| | - Prakash Nidadavolu
- Division of Molecular and Cellular NeurosciencesNational Brain Research CentreNainwal ModeManesarIndia
- Centre for NeuroscienceIndian Institute of ScienceBangaloreIndia
| | - Rupanagudi Khader Valli
- Division of Molecular and Cellular NeurosciencesNational Brain Research CentreNainwal ModeManesarIndia
| | - Uzma Saeed
- Division of Molecular and Cellular NeurosciencesNational Brain Research CentreNainwal ModeManesarIndia
| | - Mamata Mishra
- Division of Molecular and Cellular NeurosciencesNational Brain Research CentreNainwal ModeManesarIndia
| | - Pankaj Seth
- Division of Molecular and Cellular NeurosciencesNational Brain Research CentreNainwal ModeManesarIndia
| | - Vijayalakshmi Ravindranath
- Division of Molecular and Cellular NeurosciencesNational Brain Research CentreNainwal ModeManesarIndia
- Centre for NeuroscienceIndian Institute of ScienceBangaloreIndia
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18
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Greene LA, Levy O, Malagelada C. Akt as a victim, villain and potential hero in Parkinson's disease pathophysiology and treatment. Cell Mol Neurobiol 2011; 31:969-78. [PMID: 21547489 PMCID: PMC3678379 DOI: 10.1007/s10571-011-9671-8] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Accepted: 02/24/2011] [Indexed: 12/25/2022]
Abstract
There are two major purposes of this essay. The first is to summarize existing evidence that irrespective of the initiating causes, neuron death and degeneration in Parkinson's disease (PD) are due to the common feature of failure of signaling by Akt, a kinase involved in neuron survival and maintenance of synaptic contacts. The second is to consider possible means by which such a failure of Akt signaling might be benignly prevented or reversed in neurons affected by PD, so as to treat PD symptoms, block disease progression, and potentially, promote recovery.
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Affiliation(s)
- Lloyd A Greene
- Department of Pathology and Cell Biology, Columbia University College of Physicians and Surgeons, 630W. 168th Street, New York, NY 10032, USA.
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19
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Steinert JR, Chernova T, Forsythe ID. Nitric oxide signaling in brain function, dysfunction, and dementia. Neuroscientist 2011; 16:435-52. [PMID: 20817920 DOI: 10.1177/1073858410366481] [Citation(s) in RCA: 315] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Nitric oxide (NO) is an important signaling molecule that is widely used in the nervous system. With recognition of its roles in synaptic plasticity (long-term potentiation, LTP; long-term depression, LTD) and elucidation of calcium-dependent, NMDAR-mediated activation of neuronal nitric oxide synthase (nNOS), numerous molecular and pharmacological tools have been used to explore the physiology and pathological consequences for nitrergic signaling. In this review, the authors summarize the current understanding of this subtle signaling pathway, discuss the evidence for nitrergic modulation of ion channels and homeostatic modulation of intrinsic excitability, and speculate about the pathological consequences of spillover between different nitrergic compartments in contributing to aberrant signaling in neurodegenerative disorders. Accumulating evidence points to various ion channels and particularly voltage-gated potassium channels as signaling targets, whereby NO mediates activity-dependent control of intrinsic neuronal excitability; such changes could underlie broader mechanisms of synaptic plasticity across neuronal networks. In addition, the inability to constrain NO diffusion suggests that spillover from endothelium (eNOS) and/or immune compartments (iNOS) into the nervous system provides potential pathological sources of NO and where control failure in these other systems could have broader neurological implications. Abnormal NO signaling could therefore contribute to a variety of neurodegenerative pathologies such as stroke/excitotoxicity, Alzheimer's disease, multiple sclerosis, and Parkinson's disease.
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Affiliation(s)
- Joern R Steinert
- Neurotoxicity at the Synaptic Interface, MRC Toxicology Unit, University of Leicester, Leicester, UK
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20
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The Toll-like receptor-3 agonist polyinosinic:polycytidylic acid triggers nigrostriatal dopaminergic degeneration. J Neurosci 2011; 30:16091-101. [PMID: 21123556 DOI: 10.1523/jneurosci.2400-10.2010] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
In Parkinson's disease (PD), loss of striatal dopaminergic (DA) terminals and degeneration of DA neurons in the substantia nigra (SN) are associated with glial reactions. Such inflammatory processes are commonly considered an epiphenomenon of neuronal degeneration. However, there is increasing recognition of the role of neuroinflammation as an initiation factor of DA neuron degeneration. To investigate this issue, we established a new model of brain inflammation by injecting the Toll-like receptor 3 (TLR-3) agonist polyinosinic:polycytidylic acid [poly(I:C)] in the SN of adult rats. Poly(I:C) injection induced a sustained inflammatory reaction in the SN and in the dorsolateral striatum. Significant changes were detected in proteins relevant to synaptic transmission and axonal transport. In addition, cytoplasmic mislocalization of neuronal TAR DNA binding protein TDP-43 was observed. Poly(I:C) injection increased the susceptibility of midbrain DA neurons to a subsequent neurotoxic trigger (low-dose 6-hydroxydopamine). Systemic delivery of interleukin-1 receptor antagonist protected SN DA neurons exposed to combined poly(I:C) induced inflammatory and neurotoxic oxidative stress. These data indicate that viral-like neuroinflammation induces predegenerative changes in the DA system, which lowers the set point toward neuronal dysfunction and degeneration. New powerful neuroprotective therapies for PD might be considered by targeting critical inflammatory mechanisms, including cytokine-induced neurotoxicity.
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Li Y, Luo F, Wei L, Liu Z, Xu P. Knockdown of glycogen synthase kinase 3 beta attenuates 6-hydroxydopamine-induced apoptosis in SH-SY5Y cells. Neurosci Lett 2010; 487:41-6. [PMID: 20920551 DOI: 10.1016/j.neulet.2010.09.070] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2010] [Revised: 09/04/2010] [Accepted: 09/26/2010] [Indexed: 11/20/2022]
Abstract
Glycogen synthase kinase 3 beta (GSK3β) plays a critical role in signal transductions concerning neuronal death. In the present study, we investigated the potential role of GSK3β in 6-hydroxydopamine (6-OHDA)-induced toxicity in human neuroblastoma cell line SH-SY5Y. We assessed the apoptotic proteins and the relative levels of pGSK3β (Ser9) and pGSK3β (Tyr216) to GSK3β in 6-OHDA-treated SH-SY5Y. Furthermore, we downregulated the expression of GSK3β by short hairpin RNA (shRNA) interference and compared the cell viability and expression of apoptotic proteins in knockdown group with those in control group under the treatment of 6-OHDA. We found that 6-OHDA increased the expression of caspase-3 and caspase-9 but not caspase-8. Additionally, 6-OHDA decreased the ratio of pGSK3β (Ser9)/GSK3β and increased the ratio of pGSK3β (Tyr216)/GSK3β. Moreover, 6-OHDA induced less cell viability loss and lower expression of caspase-9 and caspase-3 in GSK3β knockdown group compared with control. The present data indicate that 6-OHDA may induce apoptosis in SH-SY5Y via the intrinsic death pathway and GSK3β knockdown can partly attenuate 6-OHDA-induced neuronal death and apoptosis, suggesting that GSK3β may have the potential to serve as a therapeutic target for PD.
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Affiliation(s)
- Yi Li
- Department of Neurology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, PR China
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22
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Chung CY, Licznerski P, Alavian KN, Simeone A, Lin Z, Martin E, Vance J, Isacson O. The transcription factor orthodenticle homeobox 2 influences axonal projections and vulnerability of midbrain dopaminergic neurons. ACTA ACUST UNITED AC 2010; 133:2022-31. [PMID: 20573704 DOI: 10.1093/brain/awq142] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Two adjacent groups of midbrain dopaminergic neurons, A9 (substantia nigra pars compacta) and A10 (ventral tegmental area), have distinct projections and exhibit differential vulnerability in Parkinson's disease. Little is known about transcription factors that influence midbrain dopaminergic subgroup phenotypes or their potential role in disease. Here, we demonstrate elevated expression of the transcription factor orthodenticle homeobox 2 in A10 dopaminergic neurons of embryonic and adult mouse, primate and human midbrain. Overexpression of orthodenticle homeobox 2 using lentivirus increased levels of known A10 elevated genes, including neuropilin 1, neuropilin 2, slit2 and adenylyl cyclase-activating peptide in both MN9D cells and ventral mesencephalic cultures, whereas knockdown of endogenous orthodenticle homeobox 2 levels via short hairpin RNA reduced expression of these genes in ventral mesencephalic cultures. Lack of orthodenticle homeobox 2 in the ventral mesencephalon of orthodenticle homeobox 2 conditional knockout mice caused a reduction of midbrain dopaminergic neurons and selective loss of A10 dopaminergic projections. Orthodenticle homeobox 2 overexpression protected dopaminergic neurons in ventral mesencephalic cultures from Parkinson's disease-relevant toxin, 1-methyl-4-phenylpyridinium, whereas downregulation of orthodenticle homeobox 2 using short hairpin RNA increased their susceptibility. These results show that orthodenticle homeobox 2 is important for establishing subgroup phenotypes of post-mitotic midbrain dopaminergic neurons and may alter neuronal vulnerability.
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Affiliation(s)
- Chee Yeun Chung
- Neuroregeneration Laboratories, Harvard Medical School, McLean Hospital, 115 Mill Street, Belmont, MA 02478, USA
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23
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Yu Z, Xu X, Xiang Z, Zhou J, Zhang Z, Hu C, He C. Nitrated alpha-synuclein induces the loss of dopaminergic neurons in the substantia nigra of rats. PLoS One 2010; 5:e9956. [PMID: 20386702 PMCID: PMC2851648 DOI: 10.1371/journal.pone.0009956] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2009] [Accepted: 03/08/2010] [Indexed: 12/15/2022] Open
Abstract
Background The pathology of Parkinson's disease (PD) is characterized by the degeneration of the nigrostriatal dopaminergic pathway, as well as the formation of intraneuronal inclusions known as Lewy bodies and Lewy neurites in the substantia nigra. Accumulations of nitrated α-synuclein are demonstrated in the signature inclusions of Parkinson's disease. However, whether the nitration of α-synuclein is relevant to the pathogenesis of PD is unknown. Methodology/Principal Findings In this study, effect of nitrated α-synuclein to dopaminergic (DA) neurons was determined by delivering nitrated recombinant TAT-α-synuclein intracellular. We provide evidence to show that the nitrated α-synuclein was toxic to cultured dopaminergic SHSY-5Y neurons and primary mesencephalic DA neurons to a much greater degree than unnitrated α-synuclein. Moreover, we show that administration of nitrated α-synuclein to the substantia nigra pars compacta of rats caused severe reductions in the number of DA neurons therein, and led to the down-regulation of D2R in the striatum in vivo. Furthermore, when administered to the substantia nigra of rats, nitrated α-synuclein caused PD-like motor dysfunctions, such as reduced locomotion and motor asymmetry, however unmodified α-synuclein had significantly less severe behavioral effects. Conclusions/Significance Our results provide evidence that α-synuclein, principally in its nitrated form, induce DA neuron death and may be a major factor in the etiology of PD.
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Affiliation(s)
- Zhongwang Yu
- Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of Minister of Education, Neuroscience Research Center of Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Xiaohui Xu
- Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of Minister of Education, Neuroscience Research Center of Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Zhenghua Xiang
- Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of Minister of Education, Neuroscience Research Center of Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Jianfeng Zhou
- Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of Minister of Education, Neuroscience Research Center of Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Zhaohuan Zhang
- Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of Minister of Education, Neuroscience Research Center of Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Chun Hu
- Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of Minister of Education, Neuroscience Research Center of Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Cheng He
- Institute of Neuroscience and Key Laboratory of Molecular Neurobiology of Minister of Education, Neuroscience Research Center of Changzheng Hospital, Second Military Medical University, Shanghai, China
- * E-mail:
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Functional enhancement and protection of dopaminergic terminals by RAB3B overexpression. Proc Natl Acad Sci U S A 2009; 106:22474-9. [PMID: 20007772 DOI: 10.1073/pnas.0912193106] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In Parkinson's disease (PD), dopaminergic (DA) neurons in the substantia nigra (SN, A9) are particularly vulnerable, compared to adjacent DA neurons within the ventral tegmental area (VTA, A10). Here, we show that in rat and human, one RAB3 isoform, RAB3B, has higher expression levels in A10 compared to A9 neurons. RAB3 is a monomeric GTPase protein that is highly enriched in synaptic vesicles and is involved in synaptic vesicle trafficking and synaptic transmission, disturbances of which have been implicated in several neurodegenerative diseases, including PD. These findings prompted us to further investigate the biology and neuroprotective capacity of RAB3B both in vitro and in vivo. RAB3B overexpression in human dopaminergic BE (2)-M17 cells increased neurotransmitter content, [(3)H] dopamine uptake, and levels of presynaptic proteins. AAV-mediated RAB3B overexpression in A9 DA neurons of the rat SN increased striatal dopamine content, number and size of synaptic vesicles, and levels of the presynaptic proteins, confirming in vitro findings. Measurement of extracellular DOPAC, a dopamine metabolite, following l-DOPA injection supported a role for RAB3B in enhancing the dopamine storage capacity of synaptic terminals. RAB3B overexpression in BE (2)-M17 cells was protective against toxins that simulate aspects of PD in vitro, including an oxidative stressor 6-hydroxydopamine (6-OHDA) and a proteasome inhibitor MG-132. Furthermore, RAB3B overexpression in rat SN both protected A9 DA neurons and resulted in behavioral improvement in a 6-OHDA retrograde lesion model of PD. These results suggest that RAB3B improves dopamine handling and storage capacity at presynaptic terminals, and confers protection to vulnerable DA neurons.
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Pruszak J, Just L, Isacson O, Nikkhah G. Isolation and culture of ventral mesencephalic precursor cells and dopaminergic neurons from rodent brains. CURRENT PROTOCOLS IN STEM CELL BIOLOGY 2009; Chapter 2:Unit 2D.5. [PMID: 19960452 DOI: 10.1002/9780470151808.sc02d05s11] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The ability to isolate ventral midbrain (VM) precursor cells and neurons provides a powerful means to characterize their differentiation properties and to study their potential for restoring dopamine (DA) neurons degenerated in Parkinson's disease (PD). Preparation and maintenance of DA VM in primary culture involves a number of critical steps to yield healthy cells and appropriate data. Here, we offer a detailed description of protocols to consistently prepare VM DA cultures from rat and mouse embryonic fetal-stage midbrain. We also present methods for organotypic culture of midbrain tissue, for differentiation as aggregate cultures, and for adherent culture systems of DA differentiation and maturation, followed by a synopsis of relevant analytical read-out options. Isolation and culture of rodent VM precursor cells and DA neurons can be exploited for studies of DA lineage development, of neuroprotection, and of cell therapeutic approaches in animal models of PD.
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Affiliation(s)
- Jan Pruszak
- Freiburg University Hospital, Freiburg, Germany
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The importance of molecular histology to study glial influence on neurodegenerative disorders. Focus on recent developed single cell laser microdissection. J Mol Histol 2009; 40:241-50. [PMID: 19882358 DOI: 10.1007/s10735-009-9235-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2009] [Accepted: 10/13/2009] [Indexed: 12/15/2022]
Abstract
Neuron-glia interaction is involved in physiological function of neurons, however recent evidences have suggested glial cells as participants in neurotoxic and neurotrophic mechanisms of neurodegenerative/neuroregenerative processes. Histological techniques employing immunolabeling, historadiography and in situ hybridization have been useful to localize at cell levels molecules in normal and pathological situations. The intercellular accomplishment leading to neuronal injury in central nervous system disorders implies the performance of quantitative assays to better interpret the role of related molecules or signal pathways, however one limitation employing the whole tissue is the loss of cellular resolution. The laser capture microdissection was developed recently and allows the selection of specific cell types from their original environment after freezing and sectioning the tissue sampling, leading to the quantification of gene expression in individual cells, thus providing a unique opportunity to get new informations on cell signaling related to neurodegeneration. Here we reviewed the role of glial cell signaling on neurodegenerative disorders like ischemia, Parkinson and Alzheimer diseases, and also amyotrophic lateral sclerosis and what has been published with regards to single cell laser capture microdissection technique in the molecular biology investigation on these issues.
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Nakazawa T, Shimura M, Mourin R, Kondo M, Yokokura S, Saido TC, Nishida K, Endo S. Calpain-mediated degradation of G-substrate plays a critical role in retinal excitotoxicity for amacrine cells. J Neurosci Res 2009; 87:1412-23. [DOI: 10.1002/jnr.21953] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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28
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Dynamic changes in presynaptic and axonal transport proteins combined with striatal neuroinflammation precede dopaminergic neuronal loss in a rat model of AAV alpha-synucleinopathy. J Neurosci 2009; 29:3365-73. [PMID: 19295143 DOI: 10.1523/jneurosci.5427-08.2009] [Citation(s) in RCA: 294] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Little is known about key pathological events preceding overt neuronal degeneration in Parkinson's disease (PD) and alpha-synucleinopathy. Recombinant adeno-associated virus 2-mediated delivery of mutant (A53T) human alpha-synuclein into the substantia nigra (SN) under a neuron-specific synapsin promoter resulted in protracted neurodegeneration with significant dopaminergic (DA) neuron loss by 17 weeks. As early as 4 weeks, there was an increase in a dopamine metabolite, DOPAC and histologically, DA axons in the striatum were dystrophic with degenerative bulbs. Before neuronal loss, significant changes were identified in levels of proteins relevant to synaptic transmission and axonal transport in the striatum and the SN. For example, striatal levels of rabphilin 3A and syntaxin were reduced. Levels of anterograde transport motor proteins (KIF1A, KIF1B, KIF2A, and KIF3A) were decreased in the striatum, whereas retrograde motor proteins (dynein, dynamitin, and dynactin1) were increased. In contrast to reduced levels in the striatum, KIF1A and KIF2A levels were elevated in the SN. There were dramatic changes in cytoskeletal protein levels, with actin levels increased and alpha-/gamma-tubulin levels reduced. In addition to these alterations, a neuroinflammatory response was observed at 8 weeks in the striatum, but not in the SN, demonstrated by increased levels of Iba-1, activated microglia and increased levels of proinflammatory cytokines, including IL-1beta, IFN-gamma and TNF-alpha. These results demonstrate that changes in proteins relevant to synaptic transmission and axonal transport coupled with neuroinflammation, precede alpha-synuclein-mediated neuronal death. These findings can provide ideas for antecedent biomarkers and presymptomatic interventions in PD.
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29
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Unregulated mitochondrial GSK3beta activity results in NADH: ubiquinone oxidoreductase deficiency. Neurotox Res 2009; 14:367-82. [PMID: 19073440 DOI: 10.1007/bf03033861] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
GSK3beta is prominent for its role in apoptosis signaling and has been shown to be involved in Parkinson's disease (PD) pathogenesis. The overall effects of GSK3beta activity on cell fate are well-established, but the effects of mitochondrial GSK3beta activity on mitochondrial function and cell fate are unknown. Here we selectively expressed constitutively active GSK3beta within the mitochondria and found that this enhanced the apoptosis signaling activated by the PD-mimetic NADH:ubiquinone oxidoreductase (complex I) inhibitors 1-methyl-4-phenylpyridinium ion (MPP+) and rotenone. Additionally, expression of GSK3beta in the mitochondria itself caused a significant decrease in complex I activity and ATP production. Increased mitochondrial a GSK3beta activity also increased reactive oxygen species production and perturbed the mitochondrial morphology. Conversely, chemical inhibitors of GSK3beta inhibited MPP+- and rotenone-induced apoptosis, and attenuated the mitochondrial GSK3beta-mediated impairment in complex I. These results indicate that unregulated mitochondrial GSK3beta activity can mimic some of the mitochondrial insufficiencies found in PD pathology.
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Molecular and cellular determinants for generating ES-cell derived dopamine neurons for cell therapy. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2009; 651:112-23. [PMID: 19731556 DOI: 10.1007/978-1-4419-0322-8_11] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Embryonic stem (ES) cells can generate midbrain dopaminergic (DA) neuronal phenotypes in vitro and have been successfully applied to restore function in animal models of Parkinson's disease (PD). How can we best integrate our growinginsight into the regulatory cascade of transcription factors guiding midbrain specification to further improve the in vitro differentiation of midbrain DA neurons for cell therapy of PD? To characterize the differentiation of authentic DA neurons in vitro, expression patterns of the numerous midbrain-characteristic markers need to be investigated. When using forced gene expression, such factors have to be closely monitored to avoid generation of nonphysiological cell types. Fluorescent markers such as Pitx3-GFP, TH-GFP, Sox1-GFP or surface antigens have proven useful for elimination of unwanted cell types by cell sorting, thereby averting tumors and increasing the DA fraction for transplantation studies. The importance of appropriate timing during application of extrinsic factors and the influence of cell-cell interactions in the dish has to be taken into account. This conceptual synopsis outlines current objectives, progress, but also challenges, in deriving midbrain DA neurons from pluripotent stem cells for clinical and scientific applications.
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Smidt MP. Specific vulnerability of substantia nigra compacta neurons. JOURNAL OF NEURAL TRANSMISSION. SUPPLEMENTUM 2009:39-47. [PMID: 20411766 DOI: 10.1007/978-3-211-92660-4_3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The specific loss of substantia nigra compacta (SNc) neurons in Parkinson's disease (PD) has been the main driving force in initiating research efforts to unravel the apparent SNc-specific vulnerability. Initially, metabolic constraints due to high dopamine turnover have been the main focus in the attempts to solve this issue. Recently, it has become clear that fundamental differences in the molecular signature are adding to the neuronal vulnerability and provide specific molecular dependencies. Here, the different processes that define the molecular background of SNc vulnerability are summarized.
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Affiliation(s)
- Marten P Smidt
- Rudolf Magnus Institute of Neuroscience, Department of Neuroscience and Pharmacology, University Medical Center Utrecht, Universiteitsweg 100, 3584, CG Utrecht, The Netherlands.
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