Enhancement of Proliferation and Invasion by MicroRNA-590-5p via Targeting PBRM1 in Clear Cell Renal Carcinoma Cells

MicroRNAs (miRNAs) play an important role in cancer development. In our study, miR-590-5p is found to be upregulated in the examined renal cell carcinoma (RCC) cell lines. PBRM1 acts as tumor suppressor in RCC, and its downregulation is associated with increased proliferation and aggressive behavior in RCC. We confirmed that PBRM1 was a direct target of miR-590-5p. miR-590-5p could regulate PBRM1 mRNA and protein expressions in clear cell renal carcinoma (ccRCC) ACHN and 786-O cells. Downregulation of miR-590-5p, which resulted in increased PBRM1, inhibited proliferation and invasion of ccRCC cells. Upregulation of miR-590-5p, which resulted in decreased PBRM1, promoted proliferation and invasion of ccRCC cells. The process of miR-590-5p promoting proliferation was found to be implicated in its inhibition of G(1)/S transition of ccRCC cells, and the action mechanisms were involved in its downregulation of PBRM1/p21(WAF1/CIP1) expression. In conclusion, we identified the role of miR-590-5p, serving as an oncomir in ccRCC, and our findings provide a potential target for the treatment of ccRCC.