Expression of miR-664-3p in Osteosarcoma and Its Effects on the Proliferation and Apoptosis of Osteosarcoma Cells

Background: To explore the expression level of miR-664-3p in osteosarcoma and its effects on the prolifera-tion and apoptosis of osteosarcoma cells. Methods: Specimens of osteosarcoma tissues were collected from 41 cases undergoing surgical treatment in the Orthopedics Department of Wuhan Puai Hospital, Wuhan, China from January 2015 to February 2018. Another 40 cases of normal bone tissue were collected. The expression of miR-664-3p were detected using quantificational real-time polymerase chain reaction. miR-664-3p mimics, miR-664-3p inhibitor and miR-664-3p negative control (NC) were used to transfect U2-OS, which were named as mimics group, inhibitor group and NC group, respectively. MTT assay was adopted to detect the effects of microRNA-664-3p on the prolif-eration of U2-OS after 24, 48, 72, 96 and 120 hours of transfection. Flow cytometry was applied to measure the apoptosis rate of U2-OS after miR-664-3p transfection. Finally, Western Blot was employed to detect the expression of proteolipid protein 2 (PLP2). Results: The total apoptosis rate of cells in the inhibitor group was obviously higher than those in the mimics group and the NC group (P<0.001). The relative expression level of PLP2 in the inhibitor group was signifi-cantly lower than those in the mimics group and the NC group (P<0.001). Conclusion: MiR-664-3p may be involved in the occurrence and development of osteosarcoma, and can regu-late the proliferation and apoptosis of U2-OS cells, and the expression of PLP2. Besides, miR-664-3p may be-come a novel molecular biological indicator for the diagnosis, targeted treatment and prognosis assessment of osteosarcoma.