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Yeman KB, Isik S. Down regulation of DNA topoisomerase IIβ exerts neurodegeneration like effect through Rho GTPases in cellular model of Parkinson's disease by Down regulating tyrosine hydroxylase. Neurol Res 2021; 43:464-473. [PMID: 33402057 DOI: 10.1080/01616412.2020.1867949] [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] [Indexed: 10/22/2022]
Abstract
Initiating the transcriptional activation of neuronal genes, DNA topoisomerase IIβ (topo IIβ) has a crucial role in neural differentiation and brain development. Inhibition of topo IIβ activity causes shorter axons and deteriorated neuronal connections common in neurodegenerative diseases. We previously reported that topo IIβ silencing could give rise to neurodegeneration through dysregulation of Rho GTPases and may contribute to pathogenesis of neurodegenerative diseases. Although there are several studies available proposing a link between Parkinson's Disease (PD) and Rho GTPases, there have been no reports analyzing the topo IIβ-dependent association of PD and Rho GTPases. Here, for the first time, we identified that topo IIβ has a regulatory role on Rho GTPases contributing to PD-like pathology. We analyzed the association between topo IIβ and PD by comparing topo IIβ expression levels of Retinoic Acid (RA) and Brain-derived neutrophic factor (BDNF) induced and MPP+-intoxicated SH-SY5Y cells used as an in vitro PD model. While both mRNA and protein levels of topo IIβ increase in neural differentiated cells, a significant decrease is detected in the PD model. Additionally, silencing of topo IIβ by specific siRNAs caused phenotypic alterations like deteriorated neural connections and transcriptional regulations such as upregulation of RhoA and downregulation of Cdc42, Rac1, and tyrosine hydroxylase gene expressions. Our results suggest that topo IIβ downregulation may cause neurodegeneration through dysregulation of Rho-GTPases leading to PD-like pathology.
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Affiliation(s)
- Kiyak Bercem Yeman
- Department of Molecular Medicine, Institute of Health Sciences, University of Health Sciences, Istanbul, Turkey
| | - Sevim Isik
- Department of Molecular Biology and Genetics, Faculty of Engineering and Natural Sciences, Uskudar University, Istanbul, Turkey
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2
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Noonong K, Sobhon P, Sroyraya M, Chaithirayanon K. Neuroprotective and Neurorestorative Effects of Holothuria scabra Extract in the MPTP/MPP +-Induced Mouse and Cellular Models of Parkinson's Disease. Front Neurosci 2020; 14:575459. [PMID: 33408606 PMCID: PMC7779621 DOI: 10.3389/fnins.2020.575459] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Accepted: 11/18/2020] [Indexed: 12/13/2022] Open
Abstract
Extracts from Holothuria scabra (HS) have been shown to possess anti-inflammation, anti-oxidant and anti-cancer activities. More recently, it was shown to have neuroprotective potential in Caenorhabditis elegans PD model. Here, we assessed whether HS has neuroprotective and neurorestorative effects on dopaminergic neurons in both mouse and cellular models of PD. We found that both pre-treatment and post-treatment with HS improved motor deficits in PD mouse model induced with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) as determined by grid walk test. This was likely mediated by HS protective and restorative effects on maintaining the numbers of dopaminergic neurons and fibers in both substantia nigra pars compacta (SNpc) and striatum. In a cellular model of PD, HS significantly attenuated 1-methyl-4-phenylpyridinium (MPP+)-induced apoptosis of DAergic-like neurons differentiated from SH-SY5Y cells by enhancing the expression of Bcl-2, suppressing the expression of cleaved Caspase 3 and preventing depolarization of mitochondrial membrane. In addition, HS could stimulate the expression of tyrosine hydroxylase (TH) and suppressed the formation of α-synuclein protein. Taken together, our in vivo and in vitro findings suggested that HS is an attractive candidate for the neuroprotection rather than neurorestoration in PD.
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Affiliation(s)
- Kunwadee Noonong
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Prasert Sobhon
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Morakot Sroyraya
- Department of Anatomy, Faculty of Science, Mahidol University, Bangkok, Thailand
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Pareek V, Nath B, Roy PK. Role of Neuroimaging Modality in the Assessment of Oxidative Stress in Brain: A Comprehensive Review. CNS & NEUROLOGICAL DISORDERS-DRUG TARGETS 2019; 18:372-381. [DOI: 10.2174/1871527318666190507102340] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 08/10/2018] [Accepted: 08/13/2018] [Indexed: 12/31/2022]
Abstract
Background & Objective:Oxidative stress (OS) is the secondary source of an injury in consequence to the earlier caused primary injury; it is the condition of an imbalance between oxidants and antioxidants within the physiological system. OS causes alterations in proteins and DNA structure, leading to inflammation, apoptotic cell death, and tissue damage. Neurodegenerative diseases (NDDs) such as Alzheimer's disease, Parkinson's disease, Glioma-induced neurodegeneration and the normal aging-related neuro-degeneration are primarily associated with the increased OS. The present review article is committed to delivering a comprehensive overview of the current neuroimaging modalities which estimates an indirect correlate of OS in the brain. OS-induced changes in white matter tracts and the gray matter volumes are reviewed assessing the role of diffusion tensor imaging (DTI) and voxel-based morphometry (VBM) respectively. Further, the role of magnetic resonance spectroscopy (MRS) to assess the OS-induced alterations of chemical moieties, and thus the resultant structural implications in the neurological disorders are also briefly as well as precisely reviewed.Conclusions:In the present review article we present an overview of the role of neuroimaging modalities in the diagnosis, and longitudinal assessment during treatment of the OS induced changes.
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Affiliation(s)
- Vikas Pareek
- National Neuroimaging Facility, Computational Neuroscience & Neuroimaging Department, National Brain Research Center, Manesar, Haryana, 122052, India
| | - Banshi Nath
- CERVO Brain Research Centre, Quebec QC, Canada
| | - Prasun K. Roy
- Computational Neuroscience & Neuro-Imaging Laboratory, School of Biomedical Engineering, Indian Institute of Technology (BHU), Varanasi 122005, India
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Wu JZ, Ardah M, Haikal C, Svanbergsson A, Diepenbroek M, Vaikath NN, Li W, Wang ZY, Outeiro TF, El-Agnaf OM, Li JY. Dihydromyricetin and Salvianolic acid B inhibit alpha-synuclein aggregation and enhance chaperone-mediated autophagy. Transl Neurodegener 2019; 8:18. [PMID: 31223479 PMCID: PMC6570948 DOI: 10.1186/s40035-019-0159-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Accepted: 05/24/2019] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Progressive accumulation of α-synuclein is a key step in the pathological development of Parkinson's disease. Impaired protein degradation and increased levels of α-synuclein may trigger a pathological aggregation in vitro and in vivo. The chaperone-mediated autophagy (CMA) pathway is involved in the intracellular degradation processes of α-synuclein. Dysfunction of the CMA pathway impairs α-synuclein degradation and causes cytotoxicity. RESULTS In the present study, we investigated the effects on the CMA pathway and α-synuclein aggregation using bioactive ingredients (Dihydromyricetin (DHM) and Salvianolic acid B (Sal B)) extracted from natural medicinal plants. In both cell-free and cellular models of α-synuclein aggregation, after administration of DHM and Sal B, we observed significant inhibition of α-synuclein accumulation and aggregation. Cells were co-transfected with a C-terminal modified α-synuclein (SynT) and synphilin-1, and then treated with DHM (10 μM) and Sal B (50 μM) 16 hours after transfection; levels of α-synuclein aggregation decreased significantly (68% for DHM and 75% for Sal B). Concomitantly, we detected increased levels of LAMP-1 (a marker of lysosomal homeostasis) and LAMP-2A (a key marker of CMA). Immunofluorescence analyses showed increased colocalization between LAMP-1 and LAMP-2A with α-synuclein inclusions after treatment with DHM and Sal B. We also found increased levels of LAMP-1 and LAMP-2A both in vitro and in vivo, along with decreased levels of α-synuclein. Moreover, DHM and Sal B treatments exhibited anti-inflammatory activities, preventing astroglia- and microglia-mediated neuroinflammation in BAC-α-syn-GFP transgenic mice. CONCLUSIONS Our data indicate that DHM and Sal B are effective in modulating α-synuclein accumulation and aggregate formation and augmenting activation of CMA, holding potential for the treatment of Parkinson's disease.
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Affiliation(s)
- Jia-Zhen Wu
- Institute of Neuroscience, College of Life and Health Sciences, Northeastern University, Shenyang, Liaoning China
- Key Laboratory of Maternal-Fetal Medicine of Liaoning Province and Key Laboratory of Obstetrics and Gynecology of Higher Education of Liaoning Province, Shengjing Hospital of China Medical University, Shenyang, China
| | - Mustafa Ardah
- Department of Biochemistry, College of Medicine and Health Sciences, United Arab Emirates University, PO Box 17666, Al-Ain, United Arab Emirates
| | - Caroline Haikal
- Neural Plasticity and Repair Unit, Wallenberg Neuroscience Center, Department of Experimental Medical Science, BMC A10, 221 84 Lund, Sweden
| | - Alexander Svanbergsson
- Neural Plasticity and Repair Unit, Wallenberg Neuroscience Center, Department of Experimental Medical Science, BMC A10, 221 84 Lund, Sweden
| | - Meike Diepenbroek
- Neural Plasticity and Repair Unit, Wallenberg Neuroscience Center, Department of Experimental Medical Science, BMC A10, 221 84 Lund, Sweden
| | - Nishant N. Vaikath
- Neural Plasticity and Repair Unit, Wallenberg Neuroscience Center, Department of Experimental Medical Science, BMC A10, 221 84 Lund, Sweden
- Neurological Disorders Research Center, Qatar Biomedical Research Institute (QBRI), Hamad Bin Khalifa University (HBKU), Education City, Qatar Foundation, P.O. Box 5825, Doha, Qatar
| | - Wen Li
- Neural Plasticity and Repair Unit, Wallenberg Neuroscience Center, Department of Experimental Medical Science, BMC A10, 221 84 Lund, Sweden
| | - Zhan-You Wang
- Institute of Heath Sciences, China Medical University, 110112 Shenyang, People’s Republic of China
| | - Tiago F. Outeiro
- Department of Experimental Neurodegeneration, Center for Nanoscale Microscopy and Molecular Physiology of the Brain, Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, 37073 Göttingen, Germany
- Max Planck Institute for Experimental Medicine, Göttingen, Germany
| | - Omar M. El-Agnaf
- Neurological Disorders Research Center, Qatar Biomedical Research Institute (QBRI), Hamad Bin Khalifa University (HBKU), Education City, Qatar Foundation, P.O. Box 5825, Doha, Qatar
| | - Jia-Yi Li
- Institute of Neuroscience, College of Life and Health Sciences, Northeastern University, Shenyang, Liaoning China
- Neural Plasticity and Repair Unit, Wallenberg Neuroscience Center, Department of Experimental Medical Science, BMC A10, 221 84 Lund, Sweden
- Institute of Heath Sciences, China Medical University, 110112 Shenyang, People’s Republic of China
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Silencing of Tctex1 impairs autophagy lysosomal degradation of α-synuclein and cell viability. Neuroreport 2018; 29:385-392. [PMID: 29406369 DOI: 10.1097/wnr.0000000000000979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Tctex1 is an important element of the dynein motor unit in mammalian cells that helps move targets along microtubules and toward the centrosome for degradation. Here, we analyzed the role of Tctex1 in the α-synuclein autophagy-lysosome degradation pathway using Tctex1-siRNA in SH-SY5Y cells. Results showed that siRNA silencing of Tctex1 suppressed cellular viability and promoted cell apoptosis. Protein and mRNA expression of Tctex1 and dynein decreased after Tctex1 knockdown, whereas α-synuclein, LC3-II, and LAMP2 increased. Consistently, fluorescence intensity of Tctex1 was weaker in siRNA-Tctex1-transfected cells, and that of α-synuclein, LC3-II, and LAMP2 was increased. Tctex1 inhibition reduced cell viability and promoted apoptosis. These results show that Tctex1 plays an important role in α-synuclein autophagic degradation and in maintaining cellular homeostasis.
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Sirtuins as Modifiers of Huntington's Disease (HD) Pathology. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2018; 154:105-145. [DOI: 10.1016/bs.pmbts.2017.11.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Chen Y, Lian YJ, Ma YQ, Wu CJ, Zheng YK, Xie NC. LncRNA SNHG1 promotes α-synuclein aggregation and toxicity by targeting miR-15b-5p to activate SIAH1 in human neuroblastoma SH-SY5Y cells. Neurotoxicology 2017; 68:212-221. [PMID: 29217406 DOI: 10.1016/j.neuro.2017.12.001] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2017] [Revised: 11/23/2017] [Accepted: 12/03/2017] [Indexed: 02/07/2023]
Abstract
Numerous long non-coding RNAs (lncRNAs) have been identified as aberrantly expressed in Parkinson's disease (PD). However, limited knowledge is available concerning the roles of dysregulated lncRNAs and the underlying molecular regulatory mechanism in the pathological process of PD. In this study, we found that lncRNA small nucleolar RNA host gene 1 (SNHG1) and seven in absentia homolog 1 (SIAH1) were upregulated, but microRNA-15b-5p (miR-15b-5p) was downregulated in SH-SY5Y cells pretreated with MPP+, as well as in MPTP-induced mouse model of PD. Overexpression of SIAH1 enhanced cellular toxicity of α-synuclein in SH-SY5Y cells, as indicated by the reduction of cell viability and elevation of LDH release. The percentage of α-synuclein aggregate-positive cells and the number of α-synuclein aggregates per cell were increased in SH-SY5Y cells transfected with pcDNA-SIAH1, while decreased after transfection with short interfering RNA specific for SIAH1 (si-SIAH1). Bioinformatics and luciferase reporter assay revealed that SIAH1 was a direct target of miR-15b-5p. We also found that SNHG1 could directly bind to miR-15-5p and repress miR-15-5p expression. Upregulation of miR-15b-5p alleviated α-synuclein aggregation and apoptosis by targeting SIAH1 in SH-SY5Y cells overexpressing α-synuclein. Overexpression of SNHG1 enhanced, whereas SNHG1 knockdown inhibited α-synuclein aggregation and α-synuclein-induced apoptosis. Moreover, the neuroprotective effect of si-SNHG1 was abrogated by downregulation of miR-15b-5p. In summary, our data suggest that SNHG1, as a pathogenic factor, promotes α-synuclein aggregation and toxicity by targeting the miR-15b-5p/SIAH1 axis, contributing to a better understanding of the mechanisms of Lewy body formation and loss of dopaminergic neurons in PD.
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Affiliation(s)
- Yuan Chen
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, PR China
| | - Ya-Jun Lian
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, PR China.
| | - Yun-Qing Ma
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, PR China
| | - Chuan-Jie Wu
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, PR China
| | - Ya-Ke Zheng
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, PR China
| | - Nan-Chang Xie
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, Henan Province, PR China
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Tctex1 plays a key role in the α-synuclein autophagy lysosomal degradation pathway. Neurosci Lett 2017; 661:90-95. [PMID: 28970129 DOI: 10.1016/j.neulet.2017.09.050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 09/04/2017] [Accepted: 09/25/2017] [Indexed: 11/23/2022]
Abstract
Tctex1 is an important structure of dynein light chain in mammalian cells, clarifying the role of Tctex1 in α-synuclein autophagy lysosomal degradation may offer insights into the formation of Lewy bodies and neuronal death. We constructed dsRED-N1-Tctex1 overexpression, pDsRED2-N1-Tctex1(T94E) mutation and transfected into SH-SY5Y cells. Relative protein expression was measured by Western Blot and mRNA levels were measured by real-time quantitative PCR. Confocal microscopy was used to observe their sublocalizations in cells. We found that: WST assay results show that cell activity decreased after Tctex1 mutation (T94E), while Tctex1 overexpression increased cell activity. In Tctex1 mutation transfected cell lines Tctex1 and dynein protein levels decreased; α-synuclein, LC3-II and LAMP2 protein increased. However, α-synuclein, LC3-II and LAMP2 proteins were reduced in Tctex1 overexpression cell lines, with the same trend was found in mRNA levels. In Tctex1 mutation transfected cell lines Tctex1 fluorescence intensity weakened; α-synuclein, LC3-II and LAMP2 fluorescence was enhanced, while α-synuclein, LC3-II and LAMP2 weakened in Tctex1 overexpressing cells. Our results suggest that Tctex1 mutants interference lead to Tctex1 downregulation and dysfunction. Tctex1 overexpression promoted autophagy lysosome fusion and effectively degraded α-synuclein with increased cell activity. Thus, Tctex1 plays an important role in α-synuclein autophagic degradation.
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Abstract
Recent studies have shown that autophagy is involved in peripheral nervous system disease. However, the role of autophagy in the pathogenesis of experimental autoimmune neuritis (EAN) remains unclear. Therefore, EAN was induced by a subcutaneous injection into both hind footpads of synthetic neuritogenic P2(57-81) peptide in male Lewis rats. The clinical evaluation was completed using a 10-point scale method. The histological alteration of sciatic nerves was analyzed by hematoxylin and eosin and luxol fast blue staining. The ultrastructure of sciatic nerves was analyzed by transmission electron microscopy. Expressions of beclin-1 and microtubule-associated protein light chain-3 (LC3) and p62/SQSTM1 were determined by western blot. 3-Methyladenine, the inhibitor of autophagy, was used in this research. Results showed that the clinical scores were significantly increased from day 6 to day 16 after immunization compared with the control group. Compared with the control group, the number of inflammatory cells and the histological score of sciatic nerves were significantly increased, expressions of beclin-1 and LC3-II and the ratio of LC3-II/LC3-I in the sciatic nerve were significantly increased, and the expression of p62 was significantly decreased in the EAN model group. Considerable double-membrane autophagosomes in axons and myelin sheaths of sciatic nerves were observed and the number of autophagosomes in axons and myelin sheaths of sciatic nerves in the EAN model group was obviously increased compared with the control group. 3-Methyladenine ameliorated the neurologic severity of EAN. Our results suggest that autophagy activity in nerve tissue of EAN rats is increased, which may be associated with the pathogenesis of EAN.
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Tang BL. Sirtuins as modifiers of Parkinson's disease pathology. J Neurosci Res 2016; 95:930-942. [DOI: 10.1002/jnr.23806] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 05/31/2016] [Accepted: 06/07/2016] [Indexed: 12/25/2022]
Affiliation(s)
- Bor Luen Tang
- Department of Biochemistry; Yong Loo Lin School of Medicine, National University of Singapore; Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore; Singapore
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Vidoni C, Follo C, Savino M, Melone MAB, Isidoro C. The Role of Cathepsin D in the Pathogenesis of Human Neurodegenerative Disorders. Med Res Rev 2016; 36:845-70. [DOI: 10.1002/med.21394] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 03/29/2016] [Accepted: 03/29/2016] [Indexed: 12/21/2022]
Affiliation(s)
- Chiara Vidoni
- Laboratory of Molecular Pathology, Department of Health Sciences; Università del Piemonte Orientale “A. Avogadro,”; Novara Italy
| | - Carlo Follo
- Laboratory of Molecular Pathology, Department of Health Sciences; Università del Piemonte Orientale “A. Avogadro,”; Novara Italy
| | - Miriam Savino
- Laboratory of Molecular Pathology, Department of Health Sciences; Università del Piemonte Orientale “A. Avogadro,”; Novara Italy
| | - Mariarosa A. B. Melone
- Division of Neurology, Department of Clinic and Experimental Medicine and Surgery; Second University of Naples; Naples Italy
- InterUniversity Center for Research in Neurosciences; Second University of Naples; Naples Italy
| | - Ciro Isidoro
- Laboratory of Molecular Pathology, Department of Health Sciences; Università del Piemonte Orientale “A. Avogadro,”; Novara Italy
- InterUniversity Center for Research in Neurosciences; Second University of Naples; Naples Italy
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Xing HJ, Wang LL, Yao HD, Wang XL, Xu SW. Effects of Atrazine and Chlorpyrifos on Autophagy-Related Genes in the Brain of Common Carp: Health-Risk Assessments. ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2016; 70:301-310. [PMID: 26662364 DOI: 10.1007/s00244-015-0246-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 11/21/2015] [Indexed: 06/05/2023]
Abstract
This study assessed the impacts of atrazine (ATR), chlorpyrifos (CPF), and a combined ATR/CPF exposure on the brain of common carp (Cyprinus carpio L.). The carp were sampled after a 40-days exposure to CPF and ATR, individually or in combination, followed by a 40-days recovery period to measure autophagy and antioxidant activity. The results indicate that the anti-superoxide anion and anti-hydroxy radical activities decreased upon exposure to ATR, CPF, and the ATR/CPF combination but increased after a subsequent 40-days recovery period. Quantitative real-time PCR and Western blot analyses revealed that the mRNA and protein levels of LC3B and dynein in common carp decreased significantly after exposure to ATR and CPF alone or in combination. Moreover, the mRNA and protein levels of beclin1 gene decreased significantly only in the 116 and 11.3 μg/L treatment groups. However, the mRNA and protein levels of all tested genes increased significantly after a 40-days recovery. Transmission electron microscope demonstrated the occurrence of autolysosomes in the recovery groups but not in the exposure groups. These results suggest that exposure to ATR, CPF, or their combination promotes oxidative stress and autophagic responses in the brain of common carp.
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Affiliation(s)
- Hou-Juan Xing
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin, 150030, People's Republic of China
- Animal Health Supervision Institute of Heilongjiang Province, 243 Haping Road, Xiangfang District, Harbin, 150069, People's Republic of China
| | - Liang-Liang Wang
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin, 150030, People's Republic of China
| | - Hai-Dong Yao
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin, 150030, People's Republic of China
| | - Xiao-Long Wang
- Center of Conservation Medicine & Ecological Safety, Northeast Forestry University, 26 Hexing Rd, Xiangfang District, Harbin, 150040, People's Republic of China.
- College of Wildlife Resource, Northeast Forestry University, 26 Hexing Rd, Xiangfang District, Harbin, 150040, People's Republic of China.
| | - Shi-Wen Xu
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Xiangfang District, Harbin, 150030, People's Republic of China.
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The Impact of Paeoniflorin on α-Synuclein Degradation Pathway. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2015; 2015:182495. [PMID: 26693241 PMCID: PMC4674600 DOI: 10.1155/2015/182495] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Revised: 11/08/2015] [Accepted: 11/11/2015] [Indexed: 01/23/2023]
Abstract
Paeoniflorin (PF) is the major active ingredient in the traditional Chinese medicine Radix. It plays a neuroprotective role by regulating autophagy and the ubiquitin-proteasome degradation pathway. In this study, we found PF significantly reduced cell damage caused by MPP+, returning cells to normal state. Cell viability significantly improved after 24 h exposure to RAPA and PF in the MPP+ group (all P < 0.01). CAT and SOD activities were significantly decreased after PF and RAPA treatment, compared with MPP+ (P < 0.001). In addition, MPP+ activated both LC3-II and E1; RAPA increased LC3-II but inhibited E1. PF significantly upregulated both LC3-II (autophagy) and E1 (ubiquitin-proteasome pathway) expression (P < 0.001), promoted degradation of α-synuclein, and reduced cell damage. We show MPP+ enhanced immunofluorescence signal of intracellular α-synuclein and LC3. Fluorescence intensity of α-synuclein decreased after PF treatment. In conclusion, these data show PF reversed the decline of proteasome activity caused by MPP+ and significantly upregulated both autophagy and ubiquitin-proteasome pathways, promoted the degradation of α-synuclein, and reduced cell damage. These findings suggest PF is a potential therapeutic medicine for neurodegenerative diseases.
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Cai ZL, Xu J, Xue SR, Liu YY, Zhang YJ, Zhang XZ, Wang X, Wu FP, Li XM. The E3 ubiquitin ligase seven in absentia homolog 1 may be a potential new therapeutic target for Parkinson's disease. Neural Regen Res 2015; 10:1286-91. [PMID: 26487857 PMCID: PMC4590242 DOI: 10.4103/1673-5374.162763] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
In this study, we investigated the effect of an antibody against E3 ubiquitin ligase seven in absentia homolog 1 (SIAH-1) in PC12 cells. 1-Methyl-4-phenylpyridinium (MPP+) treatment increased α-synuclein, E1 and SIAH-1 protein levels in PC12 cells, and it reduced cell viability; however, there was no significant change in light chain 3 expression. Treatment with an SIAH-1 antibody decreased mRNA expression levels of α-synuclein, light chain 3 and SIAH-1, but increased E1 mRNA expression. It also increased cell viability. Combined treatment with MPP+ and rapamycin reduced SIAH-1 and α-synuclein levels. Treatment with SIAH-1 antibody alone diminished α-synuclein immunoreactivity in PC12 cells, and reduced the colocalization of α-synuclein and light chain 3. These findings suggest that the SIAH-1 antibody reduces the monoubiquitination and aggregation of α-synuclein, promoting its degradation by the ubiquitin-proteasome pathway. Consequently, SIAH-1 may be a potential new therapeutic target for Parkinson's disease.
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Affiliation(s)
- Zeng-Lin Cai
- Department of Neurology, Affiliated Lianyungang Hospital of Xuzhou Medical College, Lianyungang, Jiangsu Province, China
| | - Jing Xu
- Department of Neurology, Affiliated Lianyungang Hospital of Xuzhou Medical College, Lianyungang, Jiangsu Province, China
| | - Shou-Ru Xue
- Department of Neurology, First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Yuan-Yuan Liu
- Department of Neurology, First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Yong-Jin Zhang
- Department of Neurology, Affiliated Lianyungang Hospital of Xuzhou Medical College, Lianyungang, Jiangsu Province, China
| | - Xin-Zhi Zhang
- Department of Neurology, Affiliated Lianyungang Hospital of Xuzhou Medical College, Lianyungang, Jiangsu Province, China
| | - Xuan Wang
- Department of Neurology, Affiliated Lianyungang Hospital of Xuzhou Medical College, Lianyungang, Jiangsu Province, China
| | - Fang-Ping Wu
- Department of Neurology, Affiliated Lianyungang Hospital of Xuzhou Medical College, Lianyungang, Jiangsu Province, China
| | - Xiao-Min Li
- Department of Neurology, Affiliated Lianyungang Hospital of Xuzhou Medical College, Lianyungang, Jiangsu Province, China
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Xing H, Wang Z, Gao X, Chen D, Wang L, Li S, Xu S. Atrazine and chlorpyrifos exposure induces liver autophagic response in common carp. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2015; 113:52-58. [PMID: 25483372 DOI: 10.1016/j.ecoenv.2014.11.027] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 11/20/2014] [Accepted: 11/25/2014] [Indexed: 06/04/2023]
Abstract
Under normal conditions, autophagy occurs at basal levels but can be induced rapidly in response to stress conditions and extracellular signals. Increasing experimental evidence indicates that the expression of autophagy-related genes play very important roles in toxicology. Atrazine (ATR) and chlorpyrifos (CPF) are the most common agrochemical in the freshwater ecosystems of the world. This study assessed the effects of ATR, CPF and combined ATR/CPF exposure on the liver of common carp. Carp were sampled after a 40-d exposure to ATR and CPF, individually or in combination, followed by a 40-d recovery to measure the mRNA and protein levels of autophagy-related genes in the liver. In addition, we also investigated the change in ultrastructure in the liver. The results revealed that the mRNA and protein levels of microtubule-associated protein 1 light chain 3 B (LC3B) and dynein were significantly induced in the treated groups compared to the solvent control group. Transmission electron microscope assays indicated that autolysosomes were observed in the exposure and recovery groups. These results indicated that ATR and CPF could induce autophagy in carp liver. To the best of our knowledge, this is the first report to study the autophagy effects caused by sub-chronic exposure to ATR, CPF and the ATR/CPF combination in common carp. The information presented in the present study may provide new insights into the mechanisms used by fish to adapt to stressful environments.
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Affiliation(s)
- Houjuan Xing
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Harbin 150030, PR China; Animal Health Supervision Institute of Heilongjiang Province, 243 Haping Road, Xiangfang District, Harbin 150069, PR China
| | - Zhilei Wang
- Animal Health Supervision Institute of Heilongjiang Province, 243 Haping Road, Xiangfang District, Harbin 150069, PR China
| | - Xuejiao Gao
- College of Veterinary Medicine, Jilin University, Changchun, Jilin Province 130032, PR China
| | - Dechun Chen
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Harbin 150030, PR China
| | - Liangliang Wang
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Harbin 150030, PR China
| | - Shu Li
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Harbin 150030, PR China.
| | - Shiwen Xu
- College of Veterinary Medicine, Northeast Agricultural University, 59 Mucai Street, Harbin 150030, PR China.
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Polajnar M, Zerovnik E. Impaired autophagy: a link between neurodegenerative and neuropsychiatric diseases. J Cell Mol Med 2014; 18:1705-11. [PMID: 25139375 PMCID: PMC4196646 DOI: 10.1111/jcmm.12349] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2014] [Accepted: 05/16/2014] [Indexed: 12/12/2022] Open
Abstract
Protein misfolding, and subsequent aggregation have been proven as the leading cause of most known dementias. Many of these, in addition to neurodegeneration, show profound changes in behaviour and thinking, thus, psychiatric symptoms. On the basis of the observation that progressive myoclonic epilepsies and neurodegenerative diseases share some common features of neurodegeneration, we proposed autophagy as a possible common impairment in these diseases. Here, we argue along similar lines for some neuropsychiatric conditions, among them depression and schizophrenia. We propose that existing and new therapies for these seemingly different diseases could be augmented with drugs used for neurodegenerative or neuropsychiatric diseases, respectively, among them some which modulate or augment autophagy.
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Affiliation(s)
- Mira Polajnar
- Department of Biochemistry and Molecular and Structural Biology, Jožef Stefan Institute, Ljubljana, Slovenia
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Hung KC, Huang HJ, Lin MW, Lei YP, Lin AMY. Roles of autophagy in MPP+-induced neurotoxicity in vivo: the involvement of mitochondria and α-synuclein aggregation. PLoS One 2014; 9:e91074. [PMID: 24646838 PMCID: PMC3960112 DOI: 10.1371/journal.pone.0091074] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2013] [Accepted: 02/07/2014] [Indexed: 12/18/2022] Open
Abstract
Macroautophagy (also known as autophagy) is an intracellular self-eating mechanism and has been proposed as both neuroprotective and neurodestructive in the central nervous system (CNS) neurodegenerative diseases. In the present study, the role of autophagy involving mitochondria and α-synuclein was investigated in MPP+ (1-methyl-4-phenylpyridinium)-induced oxidative injury in chloral hydrate-anesthetized rats in vivo. The oxidative mechanism underlying MPP+-induced neurotoxicity was identified by elevated lipid peroxidation and heme oxygenase-1 levels, a redox-regulated protein in MPP+-infused substantia nigra (SN). At the same time, MPP+ significantly increased LC3-II levels, a hallmark protein of autophagy. To block MPP+-induced autophagy in rat brain, Atg7siRNA was intranigrally infused 4 d prior to MPP+ infusion. Western blot assay showed that in vivo Atg7siRNA transfection not only reduced Atg7 levels in the MPP+-infused SN but attenuated MPP+-induced elevation in LC3-II levels, activation of caspase 9 and reduction in tyrosine hydroxylase levels, indicating that autophagy is pro-death. The immunostaining study demonstrated co-localization of LC3 and succinate dehydrogenase (a mitochondrial complex II) as well as LC3 and α-synuclein, suggesting that autophagy may engulf mitochondria and α-synuclein. Indeed, in vivo Atg7siRNA transfection mitigated MPP+-induced reduction in cytochrome c oxidase. In addition, MPP+-induced autophagy differentially altered the α-synuclein aggregates in the infused SN. In conclusion, autophagy plays a prodeath role in the MPP+-induced oxidative injury by sequestering mitochondria in the rat brain. Moreover, our data suggest that the benefits of autophagy depend on the levels of α-synuclein aggregates in the nigrostriatal dopaminergic system of the rat brain.
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Affiliation(s)
- Kai-Chih Hung
- Department of Physiology, National Yang-Ming University, Taipei, Taiwan
| | - Hui-Ju Huang
- Department of Medical Research and Education, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Ming-Wei Lin
- Institute of Public Health, National Yang-Ming University, Taipei, Taiwan
| | - Yen-Ping Lei
- Department of Nursing, National Yang-Ming University, Taipei, Taiwan
| | - Anya Maan-yuh Lin
- Department of Medical Research and Education, Taipei Veterans General Hospital, Taipei, Taiwan
- Department of Pharmacology, National Yang-Ming University, Taipei, Taiwan
- * E-mail:
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18
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Alteration of dynein function affects α-synuclein degradation via the autophagosome-lysosome pathway. Int J Mol Sci 2013; 14:24242-54. [PMID: 24351814 PMCID: PMC3876108 DOI: 10.3390/ijms141224242] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Revised: 11/26/2013] [Accepted: 12/03/2013] [Indexed: 11/17/2022] Open
Abstract
Growing evidence suggests that dynein dysfunction may be implicated in the pathogenesis of neurodegeneration. It plays a central role in aggresome formation, the delivery of autophagosome to lysosome for fusion and degradation, which is a pro-survival mechanism essential for the bulk degradation of misfolded proteins and damaged organells. Previous studies reported that dynein dysfuntion was associated with aberrant aggregation of α-synuclein, which is a major component of inclusion bodies in Parkinson's disease (PD). However, it remains unclear what roles dynein plays in α-synuclein degradation. Our study demonstrated a decrease of dynein expression in neurotoxin-induced PD models in vitro and in vivo, accompanied by an increase of α-synuclein protein level. Dynein down-regulation induced by siRNA resulted in a prolonged half-life of α-synuclein and its over-accumulation in A53T overexpressing PC12 cells. Dynein knockdown also prompted the increase of microtubule-associated protein 1 light chain 3 (LC3-II) and sequestosome 1 (SQSTM1, p62) expression, and the accumulation of autophagic vacuoles. Moreover, dynein suppression impaired the autophagosome fusion with lysosome. In summary, our findings indicate that dynein is critical for the clearance of aberrant α-synuclein via autophagosome-lysosome pathway.
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Yang YP, Hu LF, Zheng HF, Mao CJ, Hu WD, Xiong KP, Wang F, Liu CF. Application and interpretation of current autophagy inhibitors and activators. Acta Pharmacol Sin 2013; 34:625-35. [PMID: 23524572 DOI: 10.1038/aps.2013.5] [Citation(s) in RCA: 275] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Autophagy is the major intracellular degradation system, by which cytoplasmic materials are delivered to and degraded in the lysosome. As a quality control mechanism for cytoplasmic proteins and organelles, autophagy plays important roles in a variety of human diseases, including neurodegenerative diseases, cancer, cardiovascular disease, diabetes and infectious and inflammatory diseases. The discovery of ATG genes and the dissection of the signaling pathways involved in regulating autophagy have greatly enriched our knowledge on the occurrence and development of this lysosomal degradation pathway. In addition to its role in degradation, autophagy may also promote a type of programmed cell death that is different from apoptosis, termed type II programmed cell death. Owing to the dual roles of autophagy in cell death and the specificity of diseases, the exact mechanisms of autophagy in various diseases require more investigation. The application of autophagy inhibitors and activators will help us understand the regulation of autophagy in human diseases, and provide insight into the use of autophagy-targeted drugs. In this review, we summarize the latest research on autophagy inhibitors and activators and discuss the possibility of their application in human disease therapy.
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Janda E, Isidoro C, Carresi C, Mollace V. Defective autophagy in Parkinson's disease: role of oxidative stress. Mol Neurobiol 2012; 46:639-61. [PMID: 22899187 DOI: 10.1007/s12035-012-8318-1] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 07/30/2012] [Indexed: 12/21/2022]
Abstract
Parkinson's disease (PD) is a paradigmatic example of neurodegenerative disorder with a critical role of oxidative stress in its etiopathogenesis. Genetic susceptibility factors of PD, such as mutations in Parkin, PTEN-induced kinase 1, and DJ-1 as well as the exposure to pesticides and heavy metals, both contribute to altered redox balance and degeneration of dopaminergic neurons in the substantia nigra. Dysregulation of autophagy, a lysosomal-driven process of self degradation of cellular organelles and protein aggregates, is also implicated in PD and PD-related mutations, and environmental toxins deregulate autophagy. However, experimental evidence suggests a complex and ambiguous role of autophagy in PD since either impaired or abnormally upregulated autophagic flux has been shown to cause neuronal loss. Finally, it is generally believed that oxidative stress is a strong proautophagic stimulus. However, some evidence coming from neurobiology as well as from other fields indicate an inhibitory role of reactive oxygen species and reactive nitrogen species on the autophagic machinery. This review examines the scientific evidence supporting different concepts on how autophagy is dysregulated in PD and attempts to reconcile apparently contradictory views on the role of oxidative stress in autophagy regulation. The complex relationship between autophagy and oxidative stress is also considered in the context of the ongoing search for a novel PD therapy.
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Affiliation(s)
- Elzbieta Janda
- Department of Health Sciences, University Magna Graecia, Edificio Bioscienze, viale Europa, Campus Salvatore Venuta, Germaneto, 88100 Catanzaro, Italy.
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Sun X, Cao YB, Hu LF, Yang YP, Li J, Wang F, Liu CF. ASICs mediate the modulatory effect by paeoniflorin on alpha-synuclein autophagic degradation. Brain Res 2011; 1396:77-87. [DOI: 10.1016/j.brainres.2011.04.011] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Revised: 04/02/2011] [Accepted: 04/05/2011] [Indexed: 11/28/2022]
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Su M, Shi JJ, Yang YP, Li J, Zhang YL, Chen J, Hu LF, Liu CF. HDAC6 regulates aggresome-autophagy degradation pathway of α-synuclein in response to MPP+-induced stress. J Neurochem 2011; 117:112-20. [PMID: 21235576 DOI: 10.1111/j.1471-4159.2011.07180.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Increasing evidence suggests that the ubiquitin-binding histone deacetylase-6 (HDAC6) plays an important role in the clearance of misfolded proteins by autophagy. In this study, we treated PC-12 cells over-expressing human mutant (A53T) α-synuclein (α-syn) and SH-SY5Y cells with MPP(+). It was found that HDAC6 expression significantly increased and mainly colocalized with α-syn in the perinuclear region to form aggresome-like bodies. HDAC6 deficiency blocked the formation of aggresome-like bodies and interfered with the autophagy in response to MPP(+)-induced stress. Moreover, misfolded α-syn accumulated into the nuclei, resulting in its reduced clearance, and finally, the number of apoptotic cells significantly increased. Taken together, HDAC6 participated in the degradation of MPP(+)-induced misfolded α-syn aggregates by regulating the aggresome-autophagy pathway. Understanding the mechanism may disclose potential therapeutic targets for synucleinopathies such as Parkinson's disease.
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Affiliation(s)
- Min Su
- Department of Neurology, Second Affiliated Hospital of Soochow University, Suzhou, China
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24
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Effect of paraquat exposure on nitric oxide-responsive genes in rat mesencephalic cells. Nitric Oxide 2010; 23:51-9. [DOI: 10.1016/j.niox.2010.04.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2009] [Revised: 02/24/2010] [Accepted: 04/02/2010] [Indexed: 02/04/2023]
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Simunovic F, Yi M, Wang Y, Stephens R, Sonntag KC. Evidence for gender-specific transcriptional profiles of nigral dopamine neurons in Parkinson disease. PLoS One 2010; 5:e8856. [PMID: 20111594 PMCID: PMC2810324 DOI: 10.1371/journal.pone.0008856] [Citation(s) in RCA: 104] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2009] [Accepted: 12/22/2009] [Indexed: 12/21/2022] Open
Abstract
Background Epidemiological data suggest that the male gender is one of the risks factors for the development of Parkinson Disease (PD). Also, differences in the clinical manifestation and the course of PD have been observed between males and females. However, little is known about the molecular aspects underlying gender-specificity in PD. To address this issue, we determined the gene expression profiles of male and female dopamine (DA) neurons in sporadic PD. Methodology/Principal Findings We analyzed Affymetrix-based microarrays on laser microdissected DA neurons from postmortem brains of sporadic PD patients and age-matched controls across genders. Pathway enrichment demonstrated that major cellular pathways involved in PD pathogenesis showed different patterns of deregulation between males and females with more prominent downregulation of genes related to oxidative phosporylation, apoptosis, synaptic transmission and transmission of nerve impulse in the male population. In addition, we found upregulation of gene products for metabolic processes and mitochondrial energy consumption in the age-matched male control neurons. On the single cell level, selected data validation using quantitative Real-Time (qRT)-PCR was consistent with microarray raw data and supported some of the observations from data analysis. Conclusions/Significance On the molecular level, our results provide evidence that the expression profiles of aged normal and PD midbrain DA neurons are gender-specific. The observed differences in the expression profiles suggest a disease bias of the male gender, which could be in concordance with clinical observations that the male gender represents a risk factor for sporadic PD. Validation of gene expression by qRT-PCR supported the microarray results, but also pointed to several caveats involved in data interpretation.
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Affiliation(s)
- Filip Simunovic
- Department of Psychiatry, McLean Hospital, Harvard Medical School, Belmont, Massachusetts, United States of America
| | - Ming Yi
- Bioinformatics Support Group, Advanced Biomedical Computing Center, NCI-Frederick, Frederick, Maryland, United States of America
| | - Yulei Wang
- Applied Biosystems, Foster City, California, United States of America
| | - Robert Stephens
- Bioinformatics Support Group, Advanced Biomedical Computing Center, NCI-Frederick, Frederick, Maryland, United States of America
| | - Kai C. Sonntag
- Department of Psychiatry, McLean Hospital, Harvard Medical School, Belmont, Massachusetts, United States of America
- * E-mail:
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26
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Jellinger KA. Recent advances in our understanding of neurodegeneration. J Neural Transm (Vienna) 2009; 116:1111-62. [DOI: 10.1007/s00702-009-0240-y] [Citation(s) in RCA: 160] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2009] [Accepted: 05/05/2009] [Indexed: 12/12/2022]
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