Journal of Movement Disorders

Review Articles

α-Synuclein: A Promising Biomarker for Parkinson’s Disease and Related Disorders: Taku Hatano, Ayami Okuzumi, Gen Matsumoto, Taiji Tsunemi, Nobutaka Hattori; J Mov Disord. 2024;17(2):127-137. Published online April 9, 2024; DOI: https://doi.org/10.14802/jmd.24075

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Mutations in the SNCA gene, which encodes α-synuclein (α-syn), play a key role in the development of genetic Parkinson’s disease (PD). α-Syn is a major component of Lewy bodies in PD and glial cytoplasmic inclusions in multiple system atrophy (MSA). Rapid eye movement sleep behavior disorder patients often progress to PD, dementia with Lewy bodies, or MSA, which are collectively known as α-synucleinopathies. The loss of dopaminergic neurons with Lewy bodies precedes motor dysfunction in these diseases, but the mechanisms of neurodegeneration due to α-syn aggregation are poorly understood. Monitoring α-syn aggregation in vivo could serve as a diagnostic biomarker and help elucidate pathogenesis, necessitating a simple and accurate detection method. Seed amplification assays (SAAs), such as real-time quaking-induced conversion and protein misfolding cyclic amplification, are used to detect small amounts of abnormally structured α-syn protofibrils, which are central to aggregation. These methods are promising for the early diagnosis of α-synucleinopathy. Differences in α-syn filament structures between α-synucleinopathies, as observed through transmission electron microscopy and cryo-electron microscopy, suggest their role in the pathogenesis of neurodegeneration. SAAs may differentiate between subtypes of α-synucleinopathy and other diseases. Efforts are also being made to identify α-syn from blood using various methods. This review introduces body fluid α-syn biomarkers based on pathogenic α-syn seeds, which are expected to redefine α-synucleinopathy diagnosis and staging, improving clinical research accuracy and facilitating biomarker development.

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Selective detection of alpha synuclein amyloid fibrils by faradaic and non-faradaic electrochemical impedance spectroscopic approaches
Hussaini Adam, Subash C.B. Gopinath, Hemavathi Krishnan, Tijjani Adam, Makram A. Fakhri, Evan T. Salim, A. Shamsher, Sreeramanan Subramaniam, Yeng Chen
Bioelectrochemistry.2025; 161: 108800. CrossRef
Evolving Landscape of Parkinson’s Disease Research: Challenges and Perspectives
Rumiana Tenchov, Janet M. Sasso, Qiongqiong Angela Zhou
ACS Omega.2025; 10(2): 1864. CrossRef
Hypoxia Pathways in Parkinson’s Disease: From Pathogenesis to Therapeutic Targets
Yuanyuan Gao, Jiarui Zhang, Tuoxian Tang, Zhenjiang Liu
International Journal of Molecular Sciences.2024; 25(19): 10484. CrossRef
Circadian rhythm disruption: a potential trigger in Parkinson’s disease pathogenesis
Ke Xu, Yu Zhang, Yue Shi, Yake Zhang, Chengguang Zhang, Tianjiao Wang, Peizhu Lv, Yan Bai, Shun Wang
Frontiers in Cellular Neuroscience.2024;[Epub] CrossRef

Ultrastructures of α-Synuclein Filaments in Synucleinopathy Brains and Experimental Models: Airi Tarutani, Masato Hasegawa; J Mov Disord. 2024;17(1):15-29. Published online November 22, 2023; DOI: https://doi.org/10.14802/jmd.23213

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Abstract PDF

Intracellular α-synuclein (α-syn) inclusions are a neuropathological hallmark of Lewy body disease (LBD) and multiple system atrophy (MSA), both of which are termed synucleinopathies. LBD is defined by Lewy bodies and Lewy neurites in neurons, while MSA displays glial cytoplasmic inclusions in oligodendrocytes. Pathological α-syn adopts an ordered filamentous structure with a 5–10 nm filament diameter, and this conformational change has been suggested to be involved in the disease onset and progression. Synucleinopathies also exhibit characteristic ultrastructural and biochemical properties of α-syn filaments, and α-syn strains with distinct conformations have been identified. Numerous experimental studies have supported the idea that pathological α-syn self-amplifies and spreads throughout the brain, during which processes the conformation of α-syn filaments may drive the disease specificity. In this review, we summarize the ultrastructural features and heterogeneity of α-syn filaments in the brains of patients with synucleinopathy and in experimental models of seeded α-syn aggregation.

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Positron emission tomography tracers for synucleinopathies
Jie Xiang, Zhentao Zhang, Shengxi Wu, Keqiang Ye
Molecular Neurodegeneration.2025;[Epub] CrossRef
α-Synuclein: A Promising Biomarker for Parkinson’s Disease and Related Disorders
Taku Hatano, Ayami Okuzumi, Gen Matsumoto, Taiji Tsunemi, Nobutaka Hattori
Journal of Movement Disorders.2024; 17(2): 127. CrossRef
Exploring the Potential of Biomimetic Peptides in Targeting Fibrillar and Filamentous Alpha-Synuclein—An In Silico and Experimental Approach to Parkinson’s Disease
Sophia A. Frantzeskos, Mary A. Biggs, Ipsita A. Banerjee
Biomimetics.2024; 9(11): 705. CrossRef

Brief communication

Sensitivity of Detecting Alpha-Synuclein Accumulation in the Gastrointestinal Tract and Tissue Volume Examined: Chaewon Shin, Seong-Ik Kim, Sung-Hye Park, Jung Hwan Shin, Chan Young Lee, Han-Kwang Yang, Hyuk-Joon Lee, Seong-Ho Kong, Yun-Suhk Suh, Han-Joon Kim, Beomseok Jeon; J Mov Disord. 2022;15(3):264-268. Published online July 26, 2022; DOI: https://doi.org/10.14802/jmd.22042

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Abstract PDF Supplementary Material

Objective
This study aimed to evaluate whether a larger tissue volume increases the sensitivity of detecting alpha-synuclein (AS) pathology in the gastrointestinal (GI) tract.
Methods
Nine patients with Parkinson’s disease (PD) or idiopathic rapid eye movement sleep disorder (iRBD) who underwent GI operation and had full-depth intestinal blocks were included. All patients were selected from our previous study population. A total of 10 slides (5 serial sections from the proximal and distal blocks) per patient were analyzed.
Results
In previous studies, pathologic evaluation revealed phosphorylated AS (+) in 5/9 patients (55.6%) and in 1/5 controls (20.0%); in this extensive examination, this increased to 8/9 patients (88.9%) but remained the same in controls (20.0%). The severity and distribution of positive findings were similar between patients with iRBD and PD.
Conclusion
Examining a large tissue volume increased the sensitivity of detecting AS accumulation in the GI tract.

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Symmetric and Profound Monoaminergic Degeneration in Parkinson’s Disease with Premotor REM Sleep Behavior Disorder
Kyung Ah Woo, Han-Joon Kim, Jung Hwan Shin, Kangyoung Cho, Hongyoon Choi, Beomseok Jeon
Journal of Parkinson’s Disease.2024; 14(4): 823. CrossRef

Review Article

Mechanism of Anti-α-Synuclein Immunotherapy: Jun Sung Lee, Seung-Jae Lee; J Mov Disord. 2016;9(1):14-19. Published online January 25, 2016; DOI: https://doi.org/10.14802/jmd.15059

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Abstract PDF

Immunization therapy targeting α-synuclein has emerged as a promising approach for Parkinson’s disease and perhaps for other synucleinopathies. Several antibodies have shown therapeutic effects in mouse models of synucleinopathies and have alleviated the pathological and behavioral phenotypes of these mice. The mechanisms through which the immunization therapy works were initially puzzling, especially given that α-synuclein is a typical cytosolic protein. Recent studies, however, suggested that extracellular α-synuclein is an important pathogenic entity, and hence, a target for immunotherapy. Here, we review the literature describing immunization therapy for synucleinopathies in mouse models and provide current thoughts on the potential mechanisms underlying the therapeutic effects of α-synuclein immunotherapy.

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