Abstract
IL-6 has been implicated in the pathogenesis of insulin resistance. MiR-301a plays an important role in various biological and pathological processes, including cellular development and differentiation, inflammation, apoptosis and cancer. However, whether miR-301a mediates IL-6-induced insulin resistance in hepatocytes remains unknown. The activation of AKT/GSK pathway and the level of glycogenesis were examed in NCTC 1469 cells transfected miR-301a mimics and inhibitor. Using computational miRNA target prediction database, PTEN was a target of miR-301a. The effect of miR-301a on PTEN expression was evaluated using Luciferase assay and western blot. A PTEN-specific siRNA was used to further determine the effect of PTEN on IL-6-induced insulin resistance. In vivo and in vitro treatment with IL-6 was led to down-regulation of miR-301a, accompanied by impairment of theAKT/GSK pathway and glycogenesis. Importantly, over-expression of miR-301a rescued IL-6-induced decreased activation of the AKT/GSK pathway and hepatic glycogenesis. In contrast, down-regulation of miR-301a induced impaired phosphorylation of AKT and GSK, accompanied by reduced glycogenesis in hepatocytes. Moreover, our results indicate that suppression of PTEN, a ta...Continue Reading
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