MiR-21 promotes the EMT and invasion of prostate cancer cell by inducing FOXO1 / 临床外科杂志

ABSTRACT

Objective To investigate the mechanism of EMT and invasion promoted by miR-21 in prostate cancer cells. Methods The sequence of miR-21 mimic/inhibitor was firstly designed and synthesized. Then miR-21 mimic/inhibitor and its control were transfected into prostate cancer cells C4-2 and DU145, respectively. And cells were collected for mRNA isolation and RT-qPCR analysis for miR-21 and FOXOl. FOXOl, E-cadherin and N-cadherin were detected by Western blot, and the invasion of prostate cancer cells were detected by transwell assays. Results The expression of miR-21 increased in both C4-2 and DU145 after transfection, and the expression of FOXOl mRNA increased at the same time (P＜0.01).The expression of miR-21 and FOXOl mRNA in C4-2 and DU145 was decreased by miR-21 inhibitor(P＜ 0.05). The protein expression of FOXOl and N-cadherin in C4-2 and DU145 increased after the treatment of miR-21, while that of E-cadherin decreased. The protein expression of FOXOl and N-cad-herin in C4-2 and DU145 decreased after the treatment of miR-21 inhibitor, while that of E-cadherin increased. The invasive level in C4-2 and DU145 increased after the treatment of miR-21, while that decreased after the treatment of miR-21 inhibitor. Conclusion MiR-21 promotes EMT and invasion by inducing FOXOl in prostate cancer cells.