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12b-hydroxy-des-D-garcigerin A enhances glucose metabolism in insulin-resistant HepG2 cells via the IRS-1/PI3-K/Akt cell signaling pathway.
Journal of Asian Natural Products Research 2016 November
HepG2 cells were induced with a high concentration of insulin to establish an insulin-resistant cell model (HepG2/IR). The effect of 12b-hydroxy-des-D-garcigerin A (DGA) on the glucose consumption (GC) of HepG2/IR cells was analyzed with the glucose oxidase/peroxidase assay. The results showed that DGA significantly stimulated GC by enhancing the activity of hexokinase (HK) and pyruvate kinase (PK) in HepG2/IR cells. The cell signaling pathway by which DGA enhances the GC of HepG2/IR cells was explored. The results showed that DGA promoted the expression of insulin receptor (InsR) protein, and stimulated the expression of insulin receptor substrate 1 (IRS-1), phosphatidylinositol-3 kinase (p-PI3-K), and phospho-protein kinase B Serine(473) (p-AKT ser(473)). Therefore, we concluded that DGA improved the insulin-resistance of HepG2/IR cells by inducing the IRS-1/PI3-K/Akt cell signaling pathway. Interestingly, DGA had no effect on the phosphorylation of threonine(172) (Thr(172)) in AMP-activated protein kinase (AMPK).
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