miR-590-5p suppresses osteosarcoma cell proliferation and invasion via targeting KLF5

Recently, microRNA (miR)-590-5p has been shown to inhibit tumorigenesis in colorectal and breast cancer; however, its function in osteosarcoma (OS) requires further investigation. In the present study miR-590-5p expression was poorly expressed in OS samples and cell lines when compared with that observed in normal cells. In addition, overexpression of miR-590-5p significantly reduced the proliferation, migration and invasion of SAOS2 and U2OS cells in vitro, as well as inhibiting tumor sizes in vivo. The results revealed that miR-590-5p directly targeted Kruppel-like factor 5 (KLF5) in SAOS2 and U2OS cells. Their expression was inversely correlated with OS tissues. Finally, it was demonstrated that overexpression of KLF5 rescued the inhibitory effects of miR-590-5p on cell proliferation, migration and invasion. Overall, the results of the present study suggested that the miR-590-5p/KLF5 axis may regulate OS progression and thus, may be a novel therapeutic target for the treatment of patients with OS.