Zinc, Alpha Cells and Glucagon Secretion

Author(s): Laerke Egefjord , Andreas B. Petersen , Ann M. Bak , Jorgen Rungby .

Journal Name: Current Diabetes Reviews

Volume 6 , Issue 1 , 2010

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Abstract:

Zinc concentrates in islet cells and is related to insulin secretion. Islet cells act as a unit within islets and hormone secretion in the islets is profoundly influenced by paracrine and autocrine regulation. Zinc has been recognised as a candidate paracrine inhibitor of glucagon secretion in α-cells. Further zinc fluxes may contribute to regulation of cell mass, Zn2+ may be cytotoxic and Zn2+ depletion by itself can cause cell death induced by oxidative stress. Recently, both free zinc ions and a number of zinc transporters have been localized in α-cells. These include zinc importers, ZIP1, ZIP10, and ZIP14 of the SLC39A family and zinc exporters, ZnT1, and ZnT4-8 of the SLC30A family. Furthermore, the redox state of thiol groups and Voltage Gated Ca2+ Channels (VGCC) add to the maintenance of a tight cytoplasmatic zinc homeostasis in the α-cells. The ZnT8 protein has emerged as particularly interesting since this zinc transporter has been identified as a genetic risk factor for the development of both type 1 and type 2 diabetes in which both α- and β-cell functions are affected. Recent data discussed here suggest specific effects of Zn2+ on glucagon secretion and other α-cell functions.

Keywords: Pancreas, Diabetes, α-cells, Glucagon, Zinc transporters, Zn2+

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Article Details

VOLUME: 6
ISSUE: 1
Year: 2010
Page: [52 - 57]
Pages: 6
DOI: 10.2174/157339910790442655

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