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MicroRNAs (miRs) have been demonstrated to be associated with multiple processes in the development and progression of human malignancies. Previous studies have observed aberrant downregulation of miR‑144 in several types of cancer, including osteosarcoma. However, the function of miR‑144 and the underlying mechanism in osteosarcoma remain to be elucidated. The present study indicated that miR‑144 was markedly downregulated in osteosarcoma tissues and cell lines compared with that in the normal controls. Restoration of miR‑144 significantly inhibited cell proliferation, migration and invasion of MG‑63 osteosarcoma cells. In addition, Rho‑associated coiled‑coil containing protein kinase 1 (ROCK1) was identified as a novel target of miR‑144 in MG‑63 osteosarcoma cells. Furthermore, knockdown of ROCK1 suppressed the proliferation, migration and invasion of MG‑63 osteosarcoma cells to a similar extent to the effects of miR‑144 overexpression. In addition, the mRNA expression of ROCK1 was increased in osteosarcoma tissues and was negatively correlated with the expression of miR‑144. In conclusion, the results of the present study suggested that miR‑144 acts as a tumor suppressor by targeting ROCK1 in osteosarcoma.

MicroRNA-144 acts as a tumor suppressor by targeting Rho-associated coiled-coil containing protein kinase 1 in osteosarcoma cells