MicroRNA-552 promotes migration and invasion of osteosarcoma through targeting TIMP2

Aberrant miRNAs play important roles in tumor development and progression. Previous studies reported that miR-552 was dysregulated expressed in multiple cancers. However, its biological effects and underlying mechanism in osteosarcoma remains largely unknown. In present research, we demonstrated that miR-552 was significantly up-regulated in both osteosarcoma cell lines and tissues for the first time. Its high-expression was significantly associated with poor prognostic features and overall survival of osteosarcoma patients. Gain- and loss-of-function experiment confirmed that miR-552 promoted cell migration, invasion and MMPs expression. Moreover, TIMP2 was a direct downstream target of miR-552. miR-552 inversely correlated with TIMP2 in osteosarcoma tissues. TIMP2 restoration at least partially abolished the migration, invasion and MMPs expression of miR-552 on osteosarcoma cells. Above all, our data suggest that miR-552 promoted migration, invasion and MMPs expression of osteosarcoma by targeting TIMP2, and represent a novel potential therapeutic target for osteosarcoma.