Up-regulation of miR-383-5p suppresses proliferation and enhances chemosensitivity in ovarian cancer cells by targeting TRIM27.

MicroRNAs are small non-coding RNAs which play important roles in tumor progression. MiR-383-5p has been characterized as a cancer suppressor in several cancers. The aim of theses present study was to explore the role of miR-383-5p in the proliferation and chemosensitivity of ovarian cancer cells. MiR-383-5p expression was down-regulated while the expression of TRIM27 was up-regulated in ovarian cancer tissues and cell lines. We came up with the hypothesis that miR-383-5p might be involved in the tumor progression and chemoresistance of ovarian cancer through targeting TRIM27. Bioinformatics study and Luciferase reporter assay indicated that TRIM27 was a target of miR-383-5p and negatively regulated by miR-383-5p in ovarian cancer cells. Up-regulation of miR-383-5p was found to suppress cell proliferation and decrease Ki67 and PCNA expression in ovarian cancer cells (OVCAR3, A2780), suggesting that overexpressed miR-383-5p inhibited cell proliferation of ovarian cancer cells. In addition, up-regulation of miR-383-5p decreased the IC50 value of ovarian cancer cells to paclitaxel and increased cell apoptosis rate under the treatment of paclitaxel, indicating that overexpressed miR-383-5p enhanced chemosensitivity in ovarian cancer cells. However, overexpressed TRIM27 by pcDNA3.1-TRIM27 transfection counteracted the inhibitory effect of miR-383-5p on cell proliferation and chemoresistance in ovarian cancer cells. In vivo experiments also revealed that tumor growth could be inhibited by miR-383-5p mimic. Taken together, this present study found that miR-383-5p was lowly expressed while TRIM27 was highly expressed in ovarian cancer. Up-regulation of miR-383-5p inhibited cell proliferation, tumor growth and enhanced chemosensitivity of ovarian cancer cells through suppressing TRIM27 expression. Therefore, miR-383-5p/TRIM27 axis may be the potential target for the treatment of ovarian cancer.