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miR-106a* inhibits the proliferation of renal carcinoma cells by targeting IRS-2.
Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine 2015 November
MicroRNAs play critical roles in the development and progression of human cancers. Although it has been reported that miR-106a* is downregulated in follicular lymphoma, its role in renal cell carcinoma (RCC) remains unknown. This study investigated the expression and role of miR-106a* in human RCC. Our results showed that the miR-106a* expression decreased dramatically in clinical RCC tissues and cell lines. In vitro, overexpression of miR-106a* suppressed RCC cell proliferation and S/G2 transition, whereas inhibition of miR-106a* promoted cell proliferation and S/G2 transition. It was also found that miR-106a* expression was inversely correlated with the expression of insulin receptor substrate 2 (IRS-2). IRS-2 was determined to be a direct target of miR-106a* by a luciferase reporter assay. Importantly, silencing IRS-2 resulted in the same biologic effects as those of miR-106a* overexpression in RCC cells, including inhibition of RCC cell proliferation and triggering of S/G2 cell cycle arrest with inhibition of the PI3K/Akt signaling pathway. These results indicate that miR-106a* affects RCC progression by targeting IRS-2 with suppression of the PI3K/Akt signaling pathway in RCC cells. The findings suggest miR-106a* as a novel strategy for RCC treatment.
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