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FEBS letters

Saturated fatty acid-induced miR-195 impairs insulin signaling and glycogen metabolism in HepG2 cells.


PMID 25240198

Abstract

MicroRNAs (miRNAs) play an important role in insulin signaling and insulin secretion, but the role of miRNAs in the association between obesity and hepatic insulin resistance is largely unknown. This study reports that saturated fatty acid (SFA) and high fat diet (HFD) significantly induce miR-195 expression in hepatocytes, and that the insulin receptor (INSR), not insulin receptor substrate-1 (IRS-1), is a direct target of miR-195. Furthermore, the ectopic expression of miR-195 suppresses the expression of INSR, thereby impairing the insulin signaling cascade and glycogen synthesis in HepG2 cells. These findings suggest that the dysregulation of miR-195 by SFA is a detrimental factor for hepatic insulin sensitivity.

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