Abstract

Objective To investigate the effect of inhibiting the expression of microRNA-218(miR-218) on the proliferation, invasion and migration of human castrated resistant prostate cancer cell line C4-2 and its mechanism. Methods Human castration-resistant prostate cancer C4-2 cells were cultured and divided into three groups: blank control group, negative control group (NC group transfected negative control reagent) and miR-218 group (transfected with inhibitor of miR-218). Cells in each group were cultured for 5 days after treatment. The expression of miR-218 in each group was detected by quantitative real-time PCR (qPCR). WST-1 cell proliferation assay and plate cloning assay were used to detect proliferation and activity of C4-2 cells in each group after transfection. Scratch assay was used to detect the migration distance of C4-2 cells in each group. Transwell assay was used to detect the number of cell invasion and migration. Reverse transcription PCR was used to detect the expression of TOB1 gene. Western blot was used to detect the expression of TOB1 gene. Results The results of qPCR showed that the relative expression of miR-218 in castrated-resistant prostate cancer C4-2 cells in NC group and miR-218 group was 1.02±0.06 and 0.38±0.04 after transfection, respectively. The expression of miR-218 in microRNA-218 group was significantly lower than that in NC group (t=15.372, P 0.05). At 48 and 72 hours, OD value of the miR-218 group was significantly lower than that of the blank group and NC group, and the difference was statistically significant (F=12.615, 24.523, all P values 0.05). The results of RT-PCR and Western blot showed that the relative expression levels of TOB1 gene in blank group, NC group and miR-218 group were 0.20±0.02, 0.19±0.03, 0.35±0.02, and the relative expression levels of TOB1 gene protein were 0.22±0.01, 0.23±0.02, 0.68 ±0.02 after transfection, respectively. The levels of TOB1 mRNA and protein in the cells of miR-218 group were significantly higher than those in the blank group and NC group, with statistical significance (F=18.615, 22.523, all P values 0.05). Conclusions Inhibiting the expression of miR-218 in human castration-resistant prostate cancer cell line C4-2 can inhibit the proliferation and activity of C4-2 cells and inhibit the invasion and migration of C4-2 cells. The mechanism may be related to the up-regulation of TOB1 gene expression and protein expression. Key words: Prostatic neoplasms; MicroRNA-218; C4-2 cell line; Cell proliferation; Cell migration

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