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• W3217207941 abstract "The cell-to-cell transfer of α-synuclein (α-Syn) greatly contributes to Parkinson's disease (PD) pathogenesis and underlies the spread of α-Syn pathology. During this process, extracellular α-Syn can activate microglia and neuroinflammation, which plays an important role in PD. However, the effect of extracellular α-Syn on microglia autophagy is poorly understood. In the present study, we reported that extracellular α-Syn inhibited the autophagy initiation, as indicated by LC3-II reduction and p62 protein elevation in BV2 and cultured primary microglia. The in vitro findings were verified in microglia-enriched population isolated from α-Syn-overexpressing mice induced by adeno-associated virus (AAV2/9)-encoded wildtype human α-Syn injection into the substantia nigra (SN). Mechanistically, α-Syn led to microglial autophagic impairment through activating toll-like receptor 4 (Tlr4) and its downstream p38 and Akt-mTOR signaling because Tlr4 knockout and inhibition of p38, Akt as well as mTOR prevented α-Syn-induced autophagy inhibition. Moreover, inhibition of Akt reversed the mTOR activation but failed to affect p38 phosphorylation triggered by α-Syn. Functionally, the in vivo evidence showed that lysozyme 2 Cre (Lyz2cre )-mediated depletion of autophagy-related gene 5 (Atg5) in microglia aggravated the neuroinflammation and dopaminergic neuron losses in the SN and exacerbated the locomotor deficit in α-Syn-overexpressing mice. Taken together, the results suggest that extracellular α-Syn, via Tlr4-dependent p38 and Akt-mTOR signaling cascades, disrupts microglial autophagy activity which synergistically contributes to neuroinflammation and PD development." @default.
• W3217207941 created "2021-12-06" @default.
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• W3217207941 date "2021-11-22" @default.
• W3217207941 modified "2023-10-16" @default.
• W3217207941 title "α‐synuclein suppresses microglial autophagy and promotes neurodegeneration in a mouse model of Parkinson’s disease" @default.
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• W3217207941 doi "https://doi.org/10.1111/acel.13522" @default.
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