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Abnormal expression of miRNAs contributed to cancers through regulation of proliferation, apoptosis and drug resistance of cancer cells. The present study was designed to investigate the effect of miR-497 on renal cell carcinoma (RCC) and its possible mechanism. Forty paired clear cell RCC (ccRCC) tissues and adjacent normal kidney tissues were obtained from patients, who were not treated by chemotherapy or radiotherapy. RT-PCR was performed to detect expression of miR-497 in the ccRCC tissues. Effects of miR-497 on cell viability, apoptosis, migration and invasion were detected in ACHN cells. Western blotting (WB) was employed to detect the downstream targets of miR-497 We found that miR-497 in ccRCC tissues was decreased. We treated ACHN cells with miR-497 mimics and inhibitors in vitro and found that miR-497 inhibited viability, migration and invasion of ACHN cells. miR-497 promoted ACHN cells' apoptosis. VEGFR-2 was predicted as a possible target of miR-497 Luciferase reporter assay proved that miR-497 suppressed VEGFR-2 directly by binding to its 3'-UTR. Further studies showed that miR-497 influenced the MEK/ERK and p38 MAPK signalling pathways. Our findings demonstrated that miR-497 could suppress RCC by targeting VEGFR-2.

MicroRNA-497 suppresses renal cell carcinoma by targeting VEGFR-2 in ACHN cells