Expression and prognostic significance of microRNA-451 in human epithelial ovarian cancer.

OBJECTIVE: MicroRNA-451 has been proved to be downregulated in many human malignancies and correlated with tumor progression. However, its expression and clinical significance in epithelial ovarian cancer (EOC) is still unclear. The aim of this study was to explore the effects of miR-451 in EOC tumorigenesis and development.

MATERIALS AND METHODS: The expression levels of miR-451 were quantified by qRT-PCR in 115 EOC and 34 normal ovarian tissues, and correlated with clinicopathological factors and prognosis. MTT, flow cytometric assay, and transwell invasion assay were used to test the proliferation, apoptosis, and invasion of SKOV-3 EOC cells transfected with miR-451 mimics or negative control (NC) RNA-oligonucleotides.

RESULTS: MiR-451 expression was significantly downregulated in EOC compared with normal ovarian tissues. Low level of miR-451 was associated with advanced FIGO stage (p = 0.005), higher serum CA125 expression level (p = 0.005), and lymph node metastasis (p = 0.002). Multivariate Cox regression analysis identified decreased miR-451 expression as an independent factor predicting poor prognosis for EOC patients. In addition, transfection of miR-451 mimics in SKOV-3 was able to reduce cell proliferation, promote cell apoptosis, and inhibit cell invasion.

CONCLUSIONS: miR-451 may act not only as a novel diagnostic and prognostic marker, but also as a potential target for molecular therapy of EOC.