MicroRNA-1270 is associated with poor prognosis and its inhibition yielded anticancer mechanisms in human osteosarcoma.

In this work, we explored the aberrant expression pattern, clinical association, and functional regulations of microRNA-1270 (miR-1270) in osteosarcoma. Among in vitro osteosarcoma cell lines and in situ tissues of osteosarcoma patients, quantitative real time-PCR was used to examine their endogenous miR-1270 expression. Clinical correlation between endogenous miR-1270 expression and clinicopathological features of osteosarcoma patients, as well as cancer patients' overall survival, was statistically examined. MiR-1270 was downregulated in 143B and MG-63 cells by lentiviral transduction. The mechanistic effects of miR-1270 downregulation on osteosarcoma in vitro proliferation and migration, as well as in vivo tumorigenesis, were further examined. MiR-1270 was aberrantly upregulated in both in vitro osteosarcoma cell lines and in situ human tumors. Statistical analysis demonstrated endogenous miR-1270 was associated with poor clinical outcomes and shorter overall survival of osteosarcoma patients. Lentivirus-induced miR-1270 downregulation inhibited cancer in vitro proliferation and migration, as well as in vivo tumorigenesis. Aberrant upregulation miR-1270 may be a prognostic biomarker for osteosarcoma patients with poor clinical outcomes and shorter survival. Inhibition of miR-1270 may also be a potential therapeutic target for anticancer treatment in osteosarcoma. © 2018 IUBMB Life, 70(7):625-632, 2018.