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The HSP110/HSP70 disaggregation system generates spreading-competent toxic α-synuclein species.

EMBO J. 2020 Jul 01;39(13):e103954. doi:10.15252/embj.2019103954. Epub 2020 May 25
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摘要


The accumulation and prion-like propagation of α-synuclein and other amyloidogenic proteins are associated with devastating neurodegenerative diseases. Metazoan heat shock protein HSP70 and its co-chaperones DNAJB1 and HSP110 constitute a disaggregation machinery that is able to disassemble α-synuclein fibrils in vitro, but its physiological effects on α-synuclein toxicity are unknown. Here, we depleted Caenorhabditis elegans HSP-110 and monitored the consequences on α-synuclein-related pathological phenotypes such as misfolding, intercellular spreading, and toxicity in C. elegans in vivo models. Depletion of HSP-110 impaired HSP70 disaggregation activity, prevented resolubilization of amorphous aggregates, and compromised the overall cellular folding capacity. At the same time, HSP-110 depletion reduced α-synuclein foci formation, cell-to-cell transmission, and toxicity. These data demonstrate that the HSP70 disaggregation activity constitutes a double-edged sword, as it is essential for maintaining cellular proteostasis but also involved in the generation of toxic amyloid-type protein species.

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