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- W1981566506 abstract "Impairment of glucose-stimulated insulin secretion caused by the lipotoxicity of palmitate was found in β-cells. Recent studies have indicated that defects in autophagy contribute to pathogenesis in type 2 diabetes. Here, we report that autophagy-related 7 (Atg7) induced excessive autophagic activation in INS-1(823/13) cells exposed to saturated fatty acids. Atg7-induced cathepsin B (CTSB) overexpression resulted in an unexpected significant increase in proinflammatory chemokine and cytokine production levels of IL-1β, monocyte chemotactic protein-1, IL-6, and TNF-α. Inhibition of receptor-interacting protein did not affect the inflammatory response, ruling out involvement of necrosis. CTSB siRNA suppressed the inflammatory response but did not affect apoptosis significantly, suggesting that CTSB was a molecular linker between autophagy and the proinflammatory response. Blocking caspase-3 suppressed apoptosis but did not affect the inflammatory response, suggesting that CTSB induced inflammatory effects independently of apoptosis. Silencing of Nod-like receptor 3 (NLRP3) completely abolished both IL-1β secretion and the down-regulation effects of Atg7-induced CTSB overexpression on glucose-stimulated insulin secretion impairment, thus identifying the NLRP3 inflammasome as an autophagy-responsive element in the pancreatic INS-1(823/13) cell line. Combined together, our results indicate that CTSB contributed to the Atg7-induced NLRP3-dependent proinflammatory response, resulting in aggravation of lipotoxicity, independently of apoptosis in the pancreatic INS-1(823/13) cell line." @default.
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- W1981566506 date "2013-10-01" @default.
- W1981566506 modified "2023-10-13" @default.
- W1981566506 title "Cathepsin B Contributes to Autophagy-related 7 (Atg7)-induced Nod-like Receptor 3 (NLRP3)-dependent Proinflammatory Response and Aggravates Lipotoxicity in Rat Insulinoma Cell Line" @default.
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- W1981566506 doi "https://doi.org/10.1074/jbc.m113.494286" @default.
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