MicroRNAs (miRNAs) are small noncoding RNAs that are involved in different biological processes by suppressing target gene expression. miRNA microarray analysis revealed a significant decrease of miR-26a in prostate cancer tissues versus their normal counterparts, but the role of miR-26a is needed to investigate. In the present study, we found that miR-26a expression was lower in prostate cancer tissues compared with their normal controls, so did the prostate cancer cells. Next, by lentivirus-mediated gain-of-function studies, it was showed that stable miR-26a inhibited cell proliferation, metastasis, and epithelial mesenchymal transition and induced G1 phase arrest in prostate cancer. It was predicted that Wnt5a was a potential target gene of miR-26a by bioinformatics analysis. Then, luciferase assay and Western blot analysis identified that Wnt5a was a new direct target gene of miR-26a and miR-26a inhibited prostate cancer progression via Wnt5a. Altogether, the findings suggested that miR-26a may function as a tumor suppressor in prostate cancer by targeting Wnt5a.
Background: To investigate the effects of taurine on prostate cancer cell proliferation and apoptosis, and on the mammalian sterilization of a 20-like kinase-1 (MST1)/Hippo signaling pathway. Methods:The prostate cancer DU145 cell line was selected and the 3-(4,5-dimethylthiazol-2-yl)-2,5diphenyltetrazolium bromide (MTT) method was used to determine the rate of inhibition by taurine on the proliferation of the cells at 1, 10 −1 , 10 −2 , 10 −3 , 10 −4 , 10 −5 and 10 −6 mg/mL to obtain the taurine intervention concentrations. The cultured cells were divided into three groups: the blank group was cultured with conventional culture medium, the positive control group was cultured with 2 mg/mL cisplatin, and the taurine group was cultured with the determined taurine intervention concentrations of 0.003 mg/mL as low, 0.03 mg/mL as medium and 0.3 mg/mL as high concentration. After 72 h incubation, cell proliferation, apoptosis and cellular MST1/Hippo signaling pathway protein expression were observed.Results: In the comparison of cell proliferation rate, the taurine group was lower than the positive control group and the blank group (P<0.05), the cell proliferation rate of different concentrations in the taurine group decreased with the increase of concentration (P<0.05). The apoptosis rate was higher in the taurine group than in the positive control group and the blank group (P<0.05), the apoptosis rate increased with increasing concentration in the taurine group (P<0.05). The expression of MST1 and Bax was higher in the taurine group than in the positive control group and the blank group (P<0.05), the expression of MST1 and Bax increased with increasing concentration in the taurine group (P<0.05). The expression of YAP and Bcl-2 was lower in the taurine group than in the positive control group and the blank group (P<0.05), the expression of YAP and Bcl-2 decreased with increasing concentration in the taurine group (P<0.05).Conclusions: Taurine promoted apoptosis and inhibited proliferation of prostate cancer cells, and its mechanism of action may be related to the MST1/Hippo signaling pathway in a dose-dependent manner.
Prostate cancer (PCa), which is an aggressive malignancy of the male genitourinary system. In the present study, the effects of microRNA‐140 (miR‐140) on PCa were determined. We transfected miR‐140 mimics or negative control into PCa cells, and we used MTT, wound healing, and Transwell assays for determining the capacities of miR‐140 in cell proliferation, migration, and invasion, respectively. We also confirmed the relationship between miR‐140 and YES proto‐oncogene 1 (YES1) using Luciferase reporter assay. The results showed that miR‐140 was downregulated in PCa cells and tissues, and overexpression of miR‐140 could significantly suppress their capacities of proliferation, migration, and invasion. Moreover, YES1 was shown to be a direct target of miR‐140. Moreover, miR‐140 expression is negatively correlated with YES1 levels. miR‐140 exhibits significant tumor‐suppressive effects in PCa by inhibiting YES1. The study indicated that miR‐140 and YES1 could be the potential targets for PCa therapy.
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