Glucose Regulates Free Cytosolic Zn2+ Concentration, Slc39 (ZiP), and Metallothionein Gene Expression in Primary Pancreatic Islet β-Cells

Zn2+ is an important cofactor for insulin biosynthesis and storage in pancreatic β-cells. Correspondingly, polymorphisms in the SLC30A8 gene, encoding the secretory granule Zn2+ transporter ZnT8, are associated with type 2 diabetes risk. Using a genetically engineered (FRET)-based sensor (eCALWY-4), we show here that elevated glucose time-dependently increases free cytosolic Zn2+ ([Zn2+]cyt) in mouse pancreatic β-cells. These changes become highly significant (853 ± 96 pm versus 452 ± 42 pm, p < 0.001) after 24 h and are associated with increased expression of the Zn2+ importer family members Slc39a6, Slc39a7, and Slc39a8, and decreased expression of metallothionein 1 and 2. Arguing that altered expression of the above genes is not due to altered [Zn2+]cyt, elevation of extracellular (and intracellular) [Zn2+] failed to mimic the effects of high glucose. By contrast, increases in intracellular cAMP prompted by 3-isobutyl-1-methylxanthine and forskolin partially mimicked the effects of glucose on metallothionein, although not ZiP, gene expression. Modulation of intracellular Ca2+ and insulin secretion with pharmacological agents (tolbutamide and diazoxide) suggested a possible role for changes in these parameters in the regulation of Slc39a6 and Slc39a7 but not Slc39a8, nor metallothionein expression. In summary, 1) glucose induces increases in [Zn2+]cyt, which are then likely to facilitate the processing and/or the storage of insulin and its cocrystallization with Zn2+, and 2) these increases are associated with elevated expression of zinc importers. Conversely, a chronic increase in [Zn2+]cyt following sustained hyperglycemia may contribute to β-cell dysfunction and death in some forms of diabetes.

• Publication year

  2011

• Venue

  Journal of Biological Chemistry

• Publication date

  2011-05-25

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1074/jbc.M111.246082PMID 21613223PMCID 3138249
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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