期刊
MOLECULAR AND CELLULAR BIOCHEMISTRY
卷 444, 期 1-2, 页码 103-108出版社
SPRINGER
DOI: 10.1007/s11010-017-3235-2
关键词
Vitamin D; SIRT1; IRS1; GLUT4; Glucose metabolism
类别
资金
- National Institutes of Health [RO1 AT007442]
- Malcolm Feist Endowed Chair in Diabetes
- Malcolm Feist Cardiovascular Research Endowment, LSU Health Sciences Center, Shreveport, Louisiana
This study examined the hypothesis that 1,25-dihydroxyvitamin D-3 (1,25(OH)(2)D-3) upregulates the insulin-independent signaling cascade of glucose metabolism. C2C12 myotubes were treated with high glucose (HG, 25 mM) and 1,25(OH)(2)D-3 (0-50 nM). 1,25(OH)(2)D-3 supplementation upregulated both insulin-independent (SIRT1) and insulin-dependent (p-IRS) signaling molecules, and stimulated the GLUT4 translocation, and glucose uptake in HG-treated myotubes. The effect of 1,25(OH)(2)D-3 on IRS1 phosphorylation, GLUT4 translocation, and glucose uptake was attenuated in SIRT1-knockdown myotubes. Treatment with 1,25(OH)(2)D-3, coupled with insulin, enhanced GLUT4 translocation and glucose uptake compared to treatment with either insulin or 1,25(OH)(2)D-3 alone in HG-treated myotubes, which suggests that insulin-independent signaling molecules can contribute to the higher glucose metabolism observed in 1,25(OH)(2)D-3 and insulin-treated cells. The data, therefore, suggest that 1,25(OH)(2)D-3 increases glucose consumption by inducing SIRT1 activation, which in turn increases IRS1 phosphorylation and GLUT4 translocation in myotubes.
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