miR-27b expression in diagnosis and evaluation prognosis of prostate cancer

Objective: The aim of study was to investigate the expression of microRNA-27b in different prostate tissues and its anti-tumor effects in prostate cancer. Methods: Measuring the expression of microRNA-27b, evaluating the PI3K protein expression in 28 benign prostatic hyperplasia and 63 prostate cancer tissues, analyzing the correlation between miRNA-27b and PI3K, and miRNA-27b's correlation with Gleason Grading and clinical stages were analyzed. We divided the prostate cancer patients into two groups: low group and high group, comparing the overall survival and progression free survival. In the cell experiment, the PC3 was divided into three groups: NC group, BL group and miRNA group. The cells of difference groups were measuring the cell proliferation, apoptosis and cycle and evaluating PI3K, AKT and P21 protein expressions of difference groups. Results: The microRNA-27b expression of prostate cancer significantly increased Compared with benign prostatic hyperplasia (P<0.05). The PI3K protein expression of prostate cancer tissues were significantly enhanced compared with benign prostatic hyperplasia. The PI3K protein expression was positive correlation with miRNA-27b in cancer tissues. Furthermore, the microRNA-27b expression was significantly correlated with the Gleason Grading and clinical stages in prostate cancer (P<0.05, respectively). The patients with higher miR-27b expression level had both poorer overall survival and progression free survival. In cell experiment, the cell proliferation of miRNA group was significantly lower than NC group (P<0.05); the cell apoptosis and G1 phase of miRNA group were significantly difference compared with NC group (P<0.05, respectively); Compared with NC group, PI3K, AKT and P21 protein expressions were significantly down-regulation in miRNA group (P<0.05, respectively). Conclusions: miR-27b was up-regulated in prostate cancer tissue compared with benign prostatic hyperplasia tissues, and its expression level was correlated with a variety of important clinical pathological parameters. In the treatment of prostate cancer, miR-27b inhibition had effects to suppress prostate cancer proliferation by regulation PI3K/AKT/P21 signaling pathway. Moreover; miR-27b may serve as a promising biomarker for predicting the prognosis of prostate cancer.