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Resveratrol Attenuates hIAPP Amyloid Formation and Restores the Insulin Secretion Ability in hIAPP-INS1 Cell Line via Enhancing Autophagy.
Canadian Journal of Physiology and Pharmacology 2018 October 13
It has been proved that human islet amyloid polypeptide (hIAPP), the main constituent of islet amyloid deposition, is one of the important factors which can induce type 2 diabetes or graft failure after islet transplantation. As there is no research on whether resveratrol degrading the amyloid deposition by its special chemical structure or enhancing autophagy had been published, we decided to detect the function of resveratrol in degrading the amyloid deposition in pancreatic beta cells. We established stable hIAPP-INS1 cell line via transfecting INS1 cells by lentivirus that overexpresses hIAPP. Our research demonstrates that amyloid deposition existed in hIAPP-INS1 cell by the thioflavin S fluorescent staining, meanwhile the function of insulin secretion of hIAPP-INS1 cells was decreased significantly (P<0.01). After treatment with resveratrol(20μM) for 24h, amyloid deposition in hIAPP - INS1 cells was decreased significantly, and the insulin secretion was restored significantly (P<0.01). Once inhibited the autophagy of hIAPP - INS1 cells by 3-MA for 24h, resveratrol does not effectively remove hIAPP deposits again, and cannot improve the function of insulin secretion. These results provide a novel thought that resveratrol can degrade the amyloid deposition in type 2 diabetes and the graft after islet transplantation.
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