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- W3129157084 abstract "Pancreatic beta-cell dysfunction results in reductions of insulin synthesis/secretion, cell survival, and insulin sensitivity thereby inducing diabetes mellitus. In this study, how nanomolar melatonin regulates insulin synthesis and secretion in rat insulinoma INS-1E cells was investigated. At melatonin concentrations of 10 - 100 nM for 48 hours, melatonin significantly increased the insulin protein level in INS-1E cells above the level in control cells without melatonin or glucose treatments and decreased the insulin level in media with glucose: increases in insulin synthesis and decreases in insulin secretion occurred in dose-dependent manners. Luzindole or 4-phenyl-2-propionamidotetralin (4P-PDOT), melatonin receptor antagonists, inhibited the melatonin-induced insulin level in cells and media. Levels of membrane vesicle trafficking-related proteins including Rab5, GOPC, phospho-caveolin-1, EEA1, and clathrin proteins significantly increased with melatonin treatment above that in control cells without melatonin or glucose treatments, whereas expressions of APPL1 and syntaxin-6 proteins significantly decreased with melatonin treatment. The increases in the phosphorylation of mammalian target of rapamycin (p-mTOR), raptor protein, and mTOR complex 1 (mTORC1) levels were consistent with the increments in the expressions of p-Akt (Ser473, Thr308) and stress-induced IRE1α/p-eIF2α proteins in the endoplasmic reticulum following melatonin treatment. also, expression levels of Bcl-2 and Bcl-xl proteins were significantly increased compared to those in control cells without melatonin or glucose treatments, whereas the Bax protein level decreased. These results indicate that nanomolar melatonin regulates insulin synthesis and secretion associated with membrane vesicle trafficking-related proteins, including Rab5, GOPC, p-Caveolin-1, EEA1, and clathrin, through the Akt/mTOR pathway." @default.
- W3129157084 created "2021-02-15" @default.
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- W3129157084 date "2020-10-01" @default.
- W3129157084 modified "2023-09-24" @default.
- W3129157084 title "Nanomolar melatonin influences insulin synthesis and secretion in rat insulinoma INS-1E cells." @default.
- W3129157084 doi "https://doi.org/10.26402/jpp.2020.5.10" @default.
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