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Hormetic heat shock and HSF-1 overexpression improve C. elegans survival and proteostasis by inducing autophagy.
Autophagy 2017 June 4
The cellular recycling process of macroautophagy/autophagy is an essential homeostatic system induced by various stresses, but it remains unclear how autophagy contributes to organismal stress resistance. In a recent study, we report that a mild and physiologically beneficial ("hormetic") heat shock as well as overexpression of the heat-shock responsive transcription factor HSF-1 systemically increases autophagy in C. elegans. Accordingly, we found HSF-1- and heat stress-inducible autophagy to be required for C. elegans thermoresistance and longevity. Moreover, a hormetic heat shock or HSF-1 overexpression alleviated PolyQ protein aggregation in an autophagy-dependent manner. Collectively, we demonstrate a critical role for autophagy in C. elegans stress resistance and hormesis, and reveal a requirement for autophagy in HSF-1 regulated functions in the heat-shock response, proteostasis, and aging.
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