Downregulation of microRNA-586 Inhibits Proliferation, Invasion and Metastasis and Promotes Apoptosis in Human Osteosarcoma U2-OS Cell Line

In this study, we aim to examine the association of microRNA-586 (miR-586) with osteosarcoma (OS) cell proliferation, apoptosis, invasion, and metastasis. U2-OS cell lines were divided into 4 groups: an miR-586 group, anti-miR-586 group, control group (empty plasmid) and blank group (no plasmid). qRT-PCR was used to detect miR-586 expression, cell counting kit-8 and EdU assays to detect cell proliferation, flow cytometry to detect cell cycle distribution, Annexin V/PI double staining to detect cell apoptosis, and the Transwell assay to detect cell invasion and metastasis. miR-586 expression was significantly higher in the miR-586 group but significantly lower in the anti-miR-586 group compared with the control and blank groups. Cell proliferation at 2-5 days after cell transfection and the EdU-positive cell number increased obviously in the miR-586 group but decreased clearly in the anti-miR-586 group. In the miR-586 group, cells at G0/G1 stage and apoptosis cells significantly decreased, while cells at G2/M and S stages and invasive and metastatic cells significantly increased compared to the control and blank groups; however, opposite trends were found in the anti-miR-586 group. Downregulation of miR-586 expression in OS may inhibit cell proliferation, invasion and metastasis, and promote cell apoptosis.