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Venati SR, Uversky VN. Exploring Intrinsic Disorder in Human Synucleins and Associated Proteins. Int J Mol Sci 2024; 25:8399. [PMID: 39125972 PMCID: PMC11313516 DOI: 10.3390/ijms25158399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2024] [Revised: 07/27/2024] [Accepted: 07/29/2024] [Indexed: 08/12/2024] Open
Abstract
In this work, we explored the intrinsic disorder status of the three members of the synuclein family of proteins-α-, β-, and γ-synucleins-and showed that although all three human synucleins are highly disordered, the highest levels of disorder are observed in γ-synuclein. Our analysis of the peculiarities of the amino acid sequences and modeled 3D structures of the human synuclein family members revealed that the pathological mutations A30P, E46K, H50Q, A53T, and A53E associated with the early onset of Parkinson's disease caused some increase in the local disorder propensity of human α-synuclein. A comparative sequence-based analysis of the synuclein proteins from various evolutionary distant species and evaluation of their levels of intrinsic disorder using a set of commonly used bioinformatics tools revealed that, irrespective of their origin, all members of the synuclein family analyzed in this study were predicted to be highly disordered proteins, indicating that their intrinsically disordered nature represents an evolutionary conserved and therefore functionally important feature. A detailed functional disorder analysis of the proteins in the interactomes of the human synuclein family members utilizing a set of commonly used disorder analysis tools showed that the human α-synuclein interactome has relatively higher levels of intrinsic disorder as compared with the interactomes of human β- and γ- synucleins and revealed that, relative to the β- and γ-synuclein interactomes, α-synuclein interactors are involved in a much broader spectrum of highly diversified functional pathways. Although proteins interacting with three human synucleins were characterized by highly diversified functionalities, this analysis also revealed that the interactors of three human synucleins were involved in three common functional pathways, such as the synaptic vesicle cycle, serotonergic synapse, and retrograde endocannabinoid signaling. Taken together, these observations highlight the critical importance of the intrinsic disorder of human synucleins and their interactors in various neuronal processes.
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Affiliation(s)
- Sriya Reddy Venati
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA;
| | - Vladimir N. Uversky
- Department of Molecular Medicine, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA;
- USF Health Byrd Alzheimer’s Research Institute, Morsani College of Medicine, University of South Florida, Tampa, FL 33612, USA
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Li J, Yu J, Guo J, Liu J, Wan G, Wei X, Yang X, Shi J. Nardostachys jatamansi and levodopa combination alleviates Parkinson's disease symptoms in rats through activation of Nrf2 and inhibition of NLRP3 signaling pathways. PHARMACEUTICAL BIOLOGY 2023; 61:1175-1185. [PMID: 37559448 PMCID: PMC10416743 DOI: 10.1080/13880209.2023.2244176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 06/10/2023] [Accepted: 07/29/2023] [Indexed: 08/11/2023]
Abstract
CONTEXT Levodopa combined with traditional Chinese medicine has a synergistic effect on Parkinson's disease (PD). Recently, we demonstrated that Nardostachys jatamansi (D. Don) DC. [syn. Patrinia jatamansi D.Don, N. grandiflora DC.] (Valerianaceae) (NJ) can alleviate PD. OBJECTIVE To explore the synergistic effect of NJ combined with levodopa against PD. MATERIALS AND METHODS The PD model was established by injecting rotenone. Eighty-four Sprague-Dawley rats were randomly divided into seven groups: sham, model, different doses of NJ (0.31, 0.62, or 1.24 g/kg) combined with levodopa (25 mg/kg), and levodopa alone (25 and 50 mg/kg) groups. The synergistic effect of the combination was investigated by pharmacodynamic investigation and detection of expression of nuclear factor erythro2-related factor 2 (Nrf2) and NLR family proteins containing Pyrin-related domain 3 (NLRP3) pathways. RESULTS Compared with the model group, NJ + levodopa (1.24 g/kg + 25 mg/kg) increased the moving distance of PD rats in the open field (2395.34 ± 668.73 vs. 1501.41 ± 870.23, p < 0.01), enhanced the stay time on the rotating rod (84.86 ± 18.15 vs. 71.36 ± 17.53, p < 0.01) and the combination was superior to other treatments. The synergistic effects were related to NJ + levodopa (1.24 g/kg + 25 mg/kg) increasing the neurotransmitter levels by 38.80%-88.67% in PD rats, and inhibiting oxidative stress and NLRP3 pathway by activating Nrf2 pathway. DISCUSSION AND CONCLUSIONS NJ combined with levodopa is a promising therapeutic candidate for PD, which provides a scientific basis for the subsequent clinical combination therapy of levodopa to enhance the anti-PD effect.
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Affiliation(s)
- Jiayuan Li
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Jiahe Yu
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Jianyou Guo
- CAS Key Laboratory of Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China
| | - Jinfeng Liu
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Guohui Wan
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Xiaojia Wei
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Xue Yang
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Jinli Shi
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
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Ahmad A, Nosheen F, Arshad MU, Saeed F, Afzaal M, Islam F, Imran A, Noreen R, Amer Ali Y, Shah MA. Isolation and antioxidant characterization of theaflavin for neuroprotective effect in mice model. Food Sci Nutr 2023. [DOI: 10.1002/fsn3.3337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023] Open
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Environmental triggers of Parkinson's disease - Implications of the Braak and dual-hit hypotheses. Neurobiol Dis 2021; 163:105601. [PMID: 34954321 DOI: 10.1016/j.nbd.2021.105601] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 12/05/2021] [Accepted: 12/22/2021] [Indexed: 11/22/2022] Open
Abstract
Idiopathic Parkinson's disease (PD) may take decades to develop, during which many risk or protective factors may come into play to initiate the pathogenesis or modify its progression to clinical PD. The lack of understanding of this prodromal phase of PD and the factors involved has been a major hurdle in the study of PD etiology and preventive strategies. Although still controversial, the Braak and dual-hit hypotheses that PD may start peripherally in the olfactory structures and/or the gut provides a theoretical platform to identify the triggers and modifiers of PD prodromal development and progression. This is particularly true for the search of environmental causes of PD as the olfactory structures and gut are the major human mucosal interfaces with the environment. In this review, we lay out our personal views about how the Braak and dual-hit hypotheses may help us search for the environmental triggers and modifiers for PD, summarize available experimental and epidemiological evidence, and discuss research gaps and strategies.
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Hsu SS, Lin YS, Liang WZ. Inhibition of the pesticide rotenone-induced Ca 2+ signaling, cytotoxicity and oxidative stress in HCN-2 neuronal cells by the phenolic compound hydroxytyrosol. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2021; 179:104979. [PMID: 34802529 DOI: 10.1016/j.pestbp.2021.104979] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 09/30/2021] [Accepted: 10/15/2021] [Indexed: 06/13/2023]
Abstract
Rotenone, a plant-derived pesticide belonging to genera Derris and Lonchorcarpus, is an inhibitor of NADH dehydrogenase complex. Studies have shown that rotenone was applied as a neurotoxic agent in various neuronal models. Hydroxytyrosol [2-(3,4-dihydroxyphenyl)-ethanol] is a natural phenolic compound found in the olive (Olea europaea L.). Studies of hydroxytyrosol have dramatically increased because this compound may contribute to the prevention of neurodegenerative diseases. Although hydroxytyrosol has received increasing attention due to its multiple pharmacological activities, it is not explored whether hydroxytyrosol inhibited rotenone-induced cytotoxicity in the neuronal cell model. The aim of this study was to explore whether hydroxytyrosol prevented rotenone-induced Ca2+ signaling, cytotoxicity and oxidative stress in HCN-2 neuronal cell line. In HCN-2 cells, rotenone (5-30 μM) concentration-dependently induced cytosolic Ca2+ concentrations ([Ca2+]i) rises and cytotoxicity. Treatment with hydroxytyrosol (30 μM) reversed rotenone (20 μM)-induced cytotoxic responses. In Ca2+-containing medium, rotenone-induced Ca2+ entry was inhibited by 2-APB (a store-operated Ca2+ channel modulator) or hydroxytyrosol. In Ca2+-free medium, treatment with thapsigargin (an endoplasmic reticulum Ca2+ pump inhibitor) or hydroxytyrosol significantly inhibited rotenone-induced [Ca2+]i rises. Furthermore, treatment with hydroxytyrosol reversed ROS levels, cytotoxic responses, and antioxidant enzyme activities (SOD, GPX and CAT) in rotenone-treated cells. Together, in HCN-2 cells, rotenone induced Ca2+ influx via store-operated Ca2+ entry and Ca2+ release from the endoplasmic reticulum and caused oxidative stress. Moreover, hydroxytyrosol ameliorated Ca2+ or ROS-associated cytotoxicity. It suggests that hydroxytyrosol might have a protective effect on rotenone-induced neurotoxicity in human neuronal cells.
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Affiliation(s)
- Shu-Shong Hsu
- Department of Neurosurgery, Kaohsiung Veterans General Hospital, Kaohsiung 81362, Taiwan; Department of Neurosurgery, National Defense Medical Center, Taipei 11490, Taiwan; College of Health and Nursing, Meiho University, Pingtung 91202, Taiwan
| | - Yung-Shang Lin
- Department of Neurosurgery, Kaohsiung Veterans General Hospital, Kaohsiung 81362, Taiwan
| | - Wei-Zhe Liang
- Department of Pharmacy and Master Program, College of Pharmacy and Health Care, Tajen University, Pingtung County 90741, Taiwan; Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung 81362, Taiwan.
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Luo R, Zhu L, Zeng Z, Zhou R, Zhang J, Xiao S, Bi W. Dl-butylphthalide inhibits rotenone-induced oxidative stress in microglia via regulation of the Keap1/Nrf2/HO-1 signaling pathway. Exp Ther Med 2021; 21:597. [PMID: 33884035 PMCID: PMC8056112 DOI: 10.3892/etm.2021.10029] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 03/10/2021] [Indexed: 12/24/2022] Open
Abstract
Activated microglia are a source of superoxide which often increases oxidative stress in the brain microenvironment, increase production of reactive oxygen species (ROS) and directly or indirectly lead to dopaminergic neuronal death in the substantia nigra. Thus superoxide contributes to the pathogenesis of Parkinson's disease (PD). Evidence suggests that mitochondria are the main source of ROS, which cause oxidative stress in cells. Levels of ROS are thus associated with the function of the mitochondrial complex. Therefore, protecting the mitochondrial function of microglia is important for the treatment of PD. Dl-butylphthalide (NBP), a compound isolated from Chinese celery seeds, has been approved by the China Food and Drug Administration for the treatment of acute ischemic stroke. Recently, NBP demonstrated therapeutic potential for PD. However, the mechanism underlying its neuroprotective effect remains unclear. The present study aimed to investigate the effect of NBP on rotenone-induced oxidative stress in microglia and its underlying mechanisms. The results demonstrated that NBP treatment significantly increased mitochondrial membrane potential and decreased ROS level in rotenone-induced microglia. Western blot analysis showed that NBP treatment promoted entry of nuclear respiratory factor-2 (Nrf2) into the nucleus, increased heme oxygenase-1 (HO-1) expression and decreased the level of the Nrf2 inhibitory protein, Kelch-like ECH-associated protein 1. Overall, the findings indicated that NBP inhibited rotenone-induced microglial oxidative stress via the Keap1/Nrf2/HO-1 pathway, suggesting that NBP may serve as a novel agent for the treatment of PD.
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Affiliation(s)
- Rixin Luo
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510630, P.R. China
| | - Lihong Zhu
- Department of Pathophysiology, School of Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Zhaohao Zeng
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510630, P.R. China
| | - Ruiyi Zhou
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510630, P.R. China
| | - Jiawei Zhang
- Department of Pathophysiology, School of Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Shu Xiao
- Department of Pathophysiology, School of Medicine, Jinan University, Guangzhou, Guangdong 510632, P.R. China
| | - Wei Bi
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510630, P.R. China.,Clinical Neuroscience Institute, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510630, P.R. China
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7
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Luo M, Gan RY, Li BY, Mao QQ, Shang A, Xu XY, Li HY, Li HB. Effects and Mechanisms of Tea on Parkinson’s Disease, Alzheimer’s Disease and Depression. FOOD REVIEWS INTERNATIONAL 2021. [DOI: 10.1080/87559129.2021.1904413] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Min Luo
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou
| | - Ren-You Gan
- Research Center for Plants and Human Health, Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences (CAAS), Chengdu, China
- Key Laboratory of Coarse Cereal Processing (Ministry of Agriculture and Rural Affairs), Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, Chengdu University, Chengdu, China
| | - Bang-Yan Li
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou
| | - Qian-Qian Mao
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou
| | - Ao Shang
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou
| | - Xiao-Yu Xu
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou
| | - Hang-Yu Li
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou
| | - Hua-Bin Li
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou
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8
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Pyrroloquinoline Quinone Inhibits Rotenone-Induced Microglia Inflammation by Enhancing Autophagy. Molecules 2020; 25:molecules25194359. [PMID: 32977419 PMCID: PMC7582530 DOI: 10.3390/molecules25194359] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 09/18/2020] [Accepted: 09/22/2020] [Indexed: 02/07/2023] Open
Abstract
Neuroinflammation is a feature common to neurodegenerative diseases, such as Parkinson’s disease (PD), which might be responsive to therapeutic intervention. Rotenone has been widely used to establish PD models by inducing mitochondrial dysfunction and inflammation. Our previous studies have reported that pyrroloquinoline quinone (PQQ), a naturally occurring redox cofactor, could prevent mitochondrial dysfunction in rotenone induced PD models by regulating mitochondrial functions. In the present study, we aimed to investigate the effect of PQQ on neuroinflammation and the mechanism involved. BV2 microglia cells were pre-treated with PQQ followed by rotenone incubation. The data showed that PQQ did not affect the cell viability of BV2 cells treated with rotenone, while the conditioned medium (CM) of BV2 cells pre-treated with PQQ significantly increased cell viability of SH-SY5Y cells. In rotenone-treated BV2 cells, PQQ dose-dependently decreased lactate dehydrogenase (LDH) release and suppressed the up-regulation of pro-inflammation factors, such as interleukin-1β (IL-1β), IL-6 and tumor necrosis factor-α (TNF-α) in the cultured media, as well as nitric oxide (NO) release induced by rotenone. PQQ pretreatment also increased the ratio of LC3-II/LC3-I and expression of Atg5 in BV2 cells stimulated with rotenone. Additionally, the autophagosome observed by transmission electron microscopy (TEM) and co-localization of mitochondria with lysosomes indicated that mitophagy was induced by PQQ in rotenone-injured BV2 cells, and the PINK1/parkin mediated mitophagy pathway was regulated by PQQ. Further, autophagy inhibitor, 3-methyladenine (3-MA), partially abolished the neuroprotective effect of PQQ and attenuated the inhibition of inflammation with PQQ pretreatment. Taken together, our data extend our understanding of the neuroprotective effect of PQQ against rotenone-induced injury and provide evidence that autophagy enhancement might be a novel therapeutic strategy for PD treatment.
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Grünewald A, Kumar KR, Sue CM. New insights into the complex role of mitochondria in Parkinson’s disease. Prog Neurobiol 2019; 177:73-93. [DOI: 10.1016/j.pneurobio.2018.09.003] [Citation(s) in RCA: 176] [Impact Index Per Article: 35.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2018] [Revised: 07/09/2018] [Accepted: 09/10/2018] [Indexed: 02/07/2023]
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10
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In vitro neurotoxicity of salsolinol is attenuated by the presynaptic protein α-synuclein. Biochim Biophys Acta Gen Subj 2018; 1862:2835-2845. [DOI: 10.1016/j.bbagen.2018.08.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 08/29/2018] [Accepted: 08/31/2018] [Indexed: 01/08/2023]
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Elmazoglu Z, Yar Saglam AS, Sonmez C, Karasu C. Luteolin protects microglia against rotenone-induced toxicity in a hormetic manner through targeting oxidative stress response, genes associated with Parkinson’s disease and inflammatory pathways. Drug Chem Toxicol 2018; 43:96-103. [DOI: 10.1080/01480545.2018.1504961] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Zubeyir Elmazoglu
- Cellular Stress Response and Signal Transduction Research Laboratory, Department of Medical Pharmacology, Gazi University, Ankara, Turkey
| | | | - Can Sonmez
- Faculty of Medicine, Gazi University, Ankara, Turkey
| | - Cimen Karasu
- Cellular Stress Response and Signal Transduction Research Laboratory, Department of Medical Pharmacology, Gazi University, Ankara, Turkey
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12
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Faustini G, Bono F, Valerio A, Pizzi M, Spano P, Bellucci A. Mitochondria and α-Synuclein: Friends or Foes in the Pathogenesis of Parkinson's Disease? Genes (Basel) 2017; 8:genes8120377. [PMID: 29292725 PMCID: PMC5748695 DOI: 10.3390/genes8120377] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 11/27/2017] [Accepted: 12/05/2017] [Indexed: 12/22/2022] Open
Abstract
Parkinson’s disease (PD) is a movement disorder characterized by dopaminergic nigrostriatal neuron degeneration and the formation of Lewy bodies (LB), pathological inclusions containing fibrils that are mainly composed of α-synuclein. Dopaminergic neurons, for their intrinsic characteristics, have a high energy demand that relies on the efficiency of the mitochondria respiratory chain. Dysregulations of mitochondria, deriving from alterations of complex I protein or oxidative DNA damage, change the trafficking, size and morphology of these organelles. Of note, these mitochondrial bioenergetics defects have been related to PD. A series of experimental evidence supports that α-synuclein physiological action is relevant for mitochondrial homeostasis, while its pathological aggregation can negatively impinge on mitochondrial function. It thus appears that imbalances in the equilibrium between the reciprocal modulatory action of mitochondria and α-synuclein can contribute to PD onset by inducing neuronal impairment. This review will try to highlight the role of physiological and pathological α-synuclein in the modulation of mitochondrial functions.
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Affiliation(s)
- Gaia Faustini
- Department of Molecular and Translational Medicine, University of Brescia, 25123 Brescia, Italy.
| | - Federica Bono
- Laboratory of Personalized and Preventive Medicine, University of Brescia, 25123 Brescia, Italy.
| | - Alessandra Valerio
- Department of Molecular and Translational Medicine, University of Brescia, 25123 Brescia, Italy.
| | - Marina Pizzi
- Department of Molecular and Translational Medicine, University of Brescia, 25123 Brescia, Italy.
| | - PierFranco Spano
- Department of Molecular and Translational Medicine, University of Brescia, 25123 Brescia, Italy.
| | - Arianna Bellucci
- Department of Molecular and Translational Medicine, University of Brescia, 25123 Brescia, Italy.
- Laboratory of Personalized and Preventive Medicine, University of Brescia, 25123 Brescia, Italy.
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Liang Y, Zhou T, Chen Y, Lin D, Jing X, Peng S, Zheng D, Zeng Z, Lei M, Wu X, Huang K, Yang L, Xiao S, Liu J, Tao E. Rifampicin inhibits rotenone-induced microglial inflammation via enhancement of autophagy. Neurotoxicology 2017; 63:137-145. [PMID: 28986232 DOI: 10.1016/j.neuro.2017.09.015] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 09/30/2017] [Accepted: 09/30/2017] [Indexed: 12/16/2022]
Abstract
Mitochondrial and autophagic dysfunction, as well as neuroinflammation, are associated with the pathophysiology of Parkinson's disease (PD). Rotenone, an inhibitor of mitochondrial complex I, has been associated as an environmental neurotoxin related to PD. Our previous studies reported that rifampicin inhibited microglia activation and production of proinflammatory mediators induced by rotenone, but the precise mechanism has not been completely elucidated. BV2 cells were pretreated for 2h with rifampicin followed by 0.1μM rotenone, alone or in combination with chloroquine. Here, we demonstrate that rifampicin pretreatment alleviated rotenone induced release of IL-1β and IL-6, and its effects were suppressed when autophagy was inhibited by chloroquine. Moreover, preconditioning with 50μM rifampicin significantly increased viability of SH-SY5Y cells cocultured with rotenone-treated BV2 cells in the transwell coculture system. Chloroquine partially abolished the neuroprotective effects of rifampicin pretreatment. Rifampicin pretreatment significantly reversed rotenone-induced mitochondrial membrane potential reduction and reactive oxygen species accumulation. We suggest that the mechanism for rifampicin-mediated anti-inflammatory and antioxidant effects is the enhancement of autophagy. Indeed, the ratio of LC3-II/LC3-I in rifampicin-pretreated BV2 cells was significantly higher than that in cells without pretreatment. Fluorescence and electron microscopy analyses indicate an increase of lysosomes colocalized with mitochondria in cells pretreated with rifampicin, which confirms that the damaged mitochondria were cleared through autophagy (mitophagy). Taken together, the data provide further evidence that rifampicin exerts neuroprotection against rotenone-induced microglia inflammation, partially through the autophagy pathway. Modulation of autophagy by rifampicin is a novel therapeutic strategy for PD.
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Affiliation(s)
- Yanran Liang
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Tianen Zhou
- Department of Emergency, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Ying Chen
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Danyu Lin
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Xiuna Jing
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Sudan Peng
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Dezhi Zheng
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Zhifen Zeng
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Ming Lei
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Xia Wu
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Kaixun Huang
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Lianhong Yang
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Songhua Xiao
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Jun Liu
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China
| | - Enxiang Tao
- Department of Neurology, The Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 Yanjiang West Road, Guangzhou 510080, China.
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Uversky VN. Looking at the recent advances in understanding α-synuclein and its aggregation through the proteoform prism. F1000Res 2017; 6:525. [PMID: 28491292 PMCID: PMC5399969 DOI: 10.12688/f1000research.10536.1] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 04/13/2017] [Indexed: 12/31/2022] Open
Abstract
Despite attracting the close attention of multiple researchers for the past 25 years, α-synuclein continues to be an enigma, hiding sacred truth related to its structure, function, and dysfunction, concealing mechanisms of its pathological spread within the affected brain during disease progression, and, above all, covering up the molecular mechanisms of its multipathogenicity, i.e. the ability to be associated with the pathogenesis of various diseases. The goal of this article is to present the most recent advances in understanding of this protein and its aggregation and to show that the remarkable structural, functional, and dysfunctional multifaceted nature of α-synuclein can be understood using the proteoform concept.
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Affiliation(s)
- Vladimir N Uversky
- Department of Molecular Medicine and USF Health Byrd Alzheimer's Research Institute, Morsani College of Medicine, University of South Florida, 12901 Bruce B. Downs Blvd. MDC07, Tampa, FL, 33620, USA.,Laboratory of New Methods in Biology, Institute for Biological Instrumentation, Russian Academy of Sciences, 7 Institutskaya St., 142290 Pushchino, Moscow Region, Russian Federation.,Laboratory of Structural Dynamics, Stability and Folding Of Proteins, Institute of Cytology, Russian Academy of Sciences, 4 Tikhoretsky Av., 194064 St. Petersburg, Russian Federation
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Wang Y, Liu J, Chen M, Du T, Duan C, Gao G, Yang H. The novel mechanism of rotenone-induced α-synuclein phosphorylation via reduced protein phosphatase 2A activity. Int J Biochem Cell Biol 2016; 75:34-44. [PMID: 27012437 DOI: 10.1016/j.biocel.2016.03.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Revised: 02/12/2016] [Accepted: 03/17/2016] [Indexed: 12/21/2022]
Abstract
Rotenone has been shown to induce many parkinsonian features and has been widely used in chemical models of Parkinson's disease (PD). Its use is closely associated with α-synuclein (α-syn) phosphorylation both in vivo and in vitro. However, the mechanisms whereby rotenone regulates α-syn phosphorylation remain unknown. Protein phosphatase 2A (PP2A) has been shown to play an important role in α-syn dephosphorylation. We therefore investigated if rotenone caused α-syn phosphorylation by down-regulation of PP2A activity in mice. Rotenone increased the phosphorylation of α-syn at Ser129, consistent with the inhibition of PP2A activity by increased phosphorylation of tyrosine 307 at the catalytic subunit of PP2A (pTyr307 PP2Ac). We further explored the interactions among rotenone, PP2A, and α-syn in SK-N-SH cells and primary rat cortical neurons. Rotenone inhibited PP2A activity via phosphorylation of PP2Ac at Tyr307. The reduction in PP2A activity and rotenone cytotoxicity were reversed by treatment with the PP2A agonist, C2 ceramide, and the Src kinase inhibitor, SKI606. Immunoprecipitation experiments showed that rotenone induced an increase in calmodulin-Src complex in SK-N-SH cells, thus activating Src kinase, which in turn phosphorylated PP2A at Tyr307 and inhibited its activity. C2 ceramide and SKI606 significantly reversed the rotenone-induced phosphorylation and aggregation of α-syn by increasing PP2A activity. These results demonstrate that rotenone-reduced PP2A activity via Src kinase is involved in the phosphorylation of α-syn. These findings clarify the novel mechanisms whereby rotenone can induce PD.
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Affiliation(s)
- Yi Wang
- Department of Neurobiology, Capital Medical University, Center of Parkinson's Disease, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Disease of the Ministry of Education, No. 10, XiToutiao outside the YouAnmen, Fengtai District, Beijing 100069, China; Department of Clinical Laboratory, China Rehabilitation Research Center, School of Rehabilitation Medicine, Capital Medical University, No. 10, North Road, Fengtai District, Beijing 100068, China.
| | - Jia Liu
- Department of Neurobiology, Capital Medical University, Center of Parkinson's Disease, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Disease of the Ministry of Education, No. 10, XiToutiao outside the YouAnmen, Fengtai District, Beijing 100069, China.
| | - Min Chen
- Department of Neurobiology, Capital Medical University, Center of Parkinson's Disease, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Disease of the Ministry of Education, No. 10, XiToutiao outside the YouAnmen, Fengtai District, Beijing 100069, China.
| | - Tingting Du
- Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, and College of Life Sciences, Beijing Normal University, Beijing 100875, China.
| | - Chunli Duan
- Department of Neurobiology, Capital Medical University, Center of Parkinson's Disease, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Disease of the Ministry of Education, No. 10, XiToutiao outside the YouAnmen, Fengtai District, Beijing 100069, China.
| | - Ge Gao
- Department of Neurobiology, Capital Medical University, Center of Parkinson's Disease, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Disease of the Ministry of Education, No. 10, XiToutiao outside the YouAnmen, Fengtai District, Beijing 100069, China.
| | - Hui Yang
- Department of Neurobiology, Capital Medical University, Center of Parkinson's Disease, Beijing Institute for Brain Disorders, Key Laboratory for Neurodegenerative Disease of the Ministry of Education, No. 10, XiToutiao outside the YouAnmen, Fengtai District, Beijing 100069, China.
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Dutta D, Mohanakumar KP. Tea and Parkinson's disease: Constituents of tea synergize with antiparkinsonian drugs to provide better therapeutic benefits. Neurochem Int 2015; 89:181-90. [DOI: 10.1016/j.neuint.2015.08.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 08/04/2015] [Accepted: 08/06/2015] [Indexed: 12/14/2022]
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