MicroRNA-497-5p Suppresses Tumor Cell Growth of Osteosarcoma by Targeting ADP Ribosylation Factor-Like Protein 2.

BACKGROUND: Osteosarcoma (OS) is a frequent primary bone malignancy. MicroRNA-497-5p (miR-497-5p) has been recently reported to be downregulated in angiosarcoma, but its potential role in OS remains unclear.

METHODS: Quantitative real-time polymerase chain reaction was used to determine miR-497-5p expression in OS tissues and cell lines. The effect of miR-497-5p on cell growth, cell cycle progression and apoptosis were measured using CCK-8 and flow cytometry assays, respectively. The effect of miR-497-5p on ADP-ribosylation factor-like protein 2 (ARL2) was determined by luciferase reporter assay and western blot.

RESULTS: We found miR-497-5p was significantly downregulated in OS tissues and cells. Overexpression of miR-497-5p in OS cells inhibited tumor cell proliferation and induced a significant G0/G1 cell cycle arrest and apoptosis in vitro. Additionally, we found ARL2 was a new target of miR-497-5p. Moreover, ARL2 and P-p53 protein levels were significantly downregulated by treatment with miR-497-5p mimics in OS cells.

CONCLUSIONS: Taken together, our findings revealed miR-497-5p may be a tumor suppressor in OS and serve as a promising therapeutic target for OS.