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Purpose : To investigate the potential role of miR-126 in regulating the proliferation and cisplatin chemosensitivity of human hepatocellular carcinoma (HCC) cells. Methods : The expression of miR-126 was evaluated using clinical HCC specimens. MiR-126-mediated downregulation of Insulin Receptor Substrate 1 (IRS1) was determined by qRT-PCR, western blot and luciferase reporter assay. Cell Counting Kit-8 (CCK8) and colony formation assays were performed to examine the proliferation of HCC cells. Results : Decreased expression of miR126 was found in HCC tumors and was correlated with poor survival in HCC patients. In HCC cells, miR-126 targeted IRS1 for downregulation, through which miR- 126 suppressed the growth of HCC cells and desensitized HCC cells to cisplatin treatment. Conclusion : MiR-126a impairs the proliferation and cisplatin chemoresistance of HCC cells by targeting IRS1. Keywords : miR-126, IRS1, HCC, cisplatin, chemosensitivity

MiR-126 enhances cisplatin chemosensitivity in hepatocellular carcinoma cells by targeting IRS1