Zinc Supplementation Improves Glucose Homeostasis in High Fat-Fed Mice by Enhancing Pancreatic β-Cell Function

Nutrients

José Donato Jr.¹  Diogo Antonio Alves de Vasconcelos¹  Vinícius Cooper-Capetini¹  Amanda Roque Martins¹  Fernando Abdulkader¹  Angelo Rafael Carpinelli¹  Sandro Massao Hirabara² 

[1] Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo 01506-000, Brazil;Institute of Physical Activity Sciences and Sports, Cruzeiro do Sul University, São Paulo 01506-000, Brazil;

关键词: zinc;    diabetes mellitus;    insulin;    insulin resistance;   

DOI  :  10.3390/nu9101150

来源: DOAJ

【 摘 要 】

Zinc is an essential component of the insulin granule and it possibly modulates insulin secretion and signaling. Since insulin resistance is a hallmark in the development of type 2 diabetes mellitus, this study aimed at investigating if zinc supplementation is able to improve glucose tolerance and β-cell function in a model of insulin resistance. Male C57BL/6 mice were distributed in four groups according to the diet: normal fat (NF); normal fat supplemented with ZnCl2 (NFZ); high-fat (HF); and, high-fat chow supplemented with ZnCl2 (HFZ). Intraperitoneal glucose (ipGTT) and insulin (ipITT) tolerance, glycemia, insulinemia, HOMA-IR, and HOMA-β were determined after 15 weeks in each diet. Glucose-stimulated insulin secretion (GSIS) was investigated in isolated islets. The insulin effect on glucose uptake, metabolism, and signaling was investigated in soleus muscle. ZnCl2 did not affect body mass or insulin sensitivity as assessed by ipITT, HOMA-IR, muscle glucose metabolism, and Akt and GSK3-β phosphorylation. However, glucose tolerance, HOMA-β, and GSIS were significantly improved by ZnCl2 supplementation. Therefore, ZnCl2 supplementation improves glucose homeostasis in high fat-fed mice by a mechanism that enhances β-cell function, rather than whole-body or muscle insulin sensitivity.

【 授权许可】

Unknown