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- Title
Discovery of novel vitamin D-regulated proteins in INS-1 cells: a proteomic approach.
- Authors
Pepaj, Milaim; Bredahl, May K.; Gjerlaugsen, Nina; Bornstedt, Mette E.; Thorsby, Per M.
- Abstract
Background Experimental evidence indicates that vitamin D may have a beneficial role in pancreatic β-cell function. Global gene expression studies have shown that the active metabolite 1,25-dihydroxyvitamin D3 [1,25-(OH)2D3] modulates genes involved in ion transport, lipid metabolism and insulin secretion. Methods We employed stable isotope labelling by amino acids in cell culture in combination with liquid chromatography-tandem mass spectrometry to quantitatively assess the impact of two vitamin D metabolites, 1,25-(OH)2D3 and 25-hydroxyvitamin D3 [25-(OH)D3], on global protein expression on a model rat β-cell line, insulinoma-derived INS-1 cells. Results Although treatment with 1,25-(OH)2D3 resulted in 31 differentially expressed proteins, 25-(OH)D3 had no impact on protein expression. Of these 31 proteins, 29 were upregulated, whereas two showed a decrease in abundance. Proteins whose expression levels markedly increased in the presence of 1,25-(OH)2D3 included Crat, Hmgn2, Protein Tmsbl1 and Gdap1. One of the most important findings in this study is upregulation of proteins implicated in insulin granule motility and insulin exocytosis, suggesting a positive effect on insulin secretion. Moreover, modulation of several membrane transport proteins suggests that 1,25-(OH)2D3 has an impact on the homeostatic regulation of ions, which is critical for most functions in the β-cell. Conclusions In this study, we discovered a number of novel 1,25-(OH)2D3-regulated proteins, which may contribute to a better understanding of the reported beneficial effects of vitamin D on pancreatic β-cells. All in all, our findings should pave the way for future studies providing insights into molecular mechanisms by which 1,25-(OH)2D3 regulates protein expression in pancreatic β-cells. Copyright © 2014 John Wiley & Sons, Ltd.
- Publication
Diabetes/Metabolism Research & Reviews, 2015, Vol 31, Issue 5, p481
- ISSN
1520-7552
- Publication type
Article
- DOI
10.1002/dmrr.2629