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• W3012158978 abstract "ABSTRACT Alpha synuclein (αsyn) is the primary component of proteinaceous aggregates termed Lewy Bodies that pathologically define synucleinopathies including Parkinson’s disease (PD) and Dementia with Lewy Bodies (DLB). αSyn is hypothesized to spread through the brain in a prion-like fashion by misfolded protein forming a template for aggregation of endogenous αsyn. The release and uptake of αsyn from cell to cell are considered important processes for this prion-like spread. Rab27b is one of several GTPases essential to the endosomal-lysosomal pathway and is implicated in protein secretion and clearance but has yet to be characterized in its role in αsyn spread. In this study, we used a paracrine αsyn in vitro model to test the impact of Rab27b on αsyn release, clearance, and toxicity. shRNA-mediated knockdown (KD) of Rab27b increased αsyn-mediated paracrine toxicity. While Rab27b reduced αsyn release primarily through non-exosomal pathways, the αsyn released under KD conditions was of higher molecular weight species by size exclusion chromatography. Rab27b KD increased intracellular insoluble αsyn levels and led to an accumulation of endogenous LC3 positive puncta. Rab27b KD also decreased LC3 turnover with chloroquine treatment, indicating a defect in autophagic flux. Rab27b protein levels were increased in postmortem human brain lysates from PD and DLB subjects compared to healthy controls. These data indicate a role for Rab27b in the release, clearance, and toxicity of αsyn and ultimately in the pathogenesis of synucleinopathies." @default.
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• W3012158978 date "2020-03-09" @default.
• W3012158978 modified "2023-09-23" @default.
• W3012158978 title "Rab27b regulates the release, autophagic clearance, and toxicity of alpha-synuclein" @default.
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• W3012158978 doi "https://doi.org/10.1101/2020.03.09.984096" @default.
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