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Nutrients 2017, 9(10), 1150; doi:10.3390/nu9101150

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

1
Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo 01506-000, Brazil
2
Institute of Physical Activity Sciences and Sports, Cruzeiro do Sul University, São Paulo 01506-000, Brazil
*
Author to whom correspondence should be addressed.
Received: 15 August 2017 / Revised: 28 September 2017 / Accepted: 3 October 2017 / Published: 20 October 2017
(This article belongs to the Special Issue Dietary Zn and Human Health)
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Abstract

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. View Full-Text
Keywords: zinc; diabetes mellitus; insulin; insulin resistance zinc; diabetes mellitus; insulin; insulin resistance
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Cooper-Capetini, V.; de Vasconcelos, D.A.A.; Martins, A.R.; Hirabara, S.M.; Donato Jr., J.; Carpinelli, A.R.; Abdulkader, F. Zinc Supplementation Improves Glucose Homeostasis in High Fat-Fed Mice by Enhancing Pancreatic β-Cell Function. Nutrients 2017, 9, 1150.

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