miR-145-5p靶向ARK5调控人上皮性卵巢癌细胞增殖凋亡的作用

Role of miR-145-5p Targeting ARK5 in Regulating the Proliferation and Apoptosis of Human Epithelial Ovarian Cancer Cells

目的探讨miR-145-5p对人上皮性卵巢癌细胞增殖和凋亡的影响及可能涉及的分子机制。方法实时定量PCR检测miR-145-5p在正常卵巢上皮细胞及卵巢癌细胞中的表达差异,CCK-8、流式细胞术检测过表达miR-145-5p对卵巢癌细胞增殖和凋亡的影响。靶基因预测软件预测miR-145-5p的靶基因,生物信息学、Western blot、双荧光素酶基因验证报告实验、挽救实验等方法预测并验证miR-145-5p在卵巢癌细胞中发挥作用涉及的分子机制。结果卵巢癌细胞中miR-145-5p的表达水平明显低于正常卵巢上皮细胞(t=4.345,P=0.049)。与对照组相比,过表达miR-145-5p的卵巢癌细胞增殖率明显降低(t=-15.790,P<0.001),凋亡率明显增加(t=5.433,P=0.032)。TargetScan软件在线预测及双荧光素酶基因验证报告实验结果表明,ARK5是miR-145-5p的直接靶基因(t=4.583,P=0.010)。ARK5过表达细胞的增殖率明显升高(t=27.290,P<0.001),凋亡率明显下降(t=-8.241,P=0.001)。过表达miR-145-5p可在mRNA(t=-12.824,P<0.001)及蛋白水平(t=-4.792,P=0.001)明显下调ARK5的表达。ARK5的挽救性表达显著抵消了miR-145-5p对细胞增殖的抑制(t=15.580,P=0.004)和促细胞凋亡(t=-12.470,P=0.006)的效果。结论miR-145-5p可能是通过靶向抑制ARK5来抑制卵巢癌细胞增殖和促进细胞凋亡的。

Objective To explore the effect of miR-145-5p on the proliferation and apoptosis of human ovarian cancer cells and the possible molecular mechanisms involved.Methods Real-time quantitative PCR was performed to detect the expression of miR-145-5p in ovarian epithelial cells and ovarian cancer cells.CCK-8 and flow cytometry were used to detect the effects of miR-145-5p overexpression on the proliferation and apoptosis of ovarian cancer cells.TargetScan was employed to predict the target genes of miR-145-5p.Western blotting,dual luciferase reporter assay and rescue experiment were employed to predict and verify the underlying molecular mechanism of miR-145-5p function.Results The expression of miR-145-5p in ovarian cancer cells was significantly lower than that in normal ovarian epithelial cells(t=4.345,P=0.049).Compared with the control group,the overexpression of miR-145-5p reduced the proliferation rate(t=-15.790,P<0.001)and increased the apoptosis rate(t=5.433,P=0.032)of ovarian cancer cells.ARK5 was predicted as the direct target gene of miR-145-5p(t=4.583,P=0.010).The cells with ARK5 overexpression showed increased proliferation rate(t=27.290,P<0.001)and decreased apoptosis rate(t=-8.241,P=0.001).The overexpression of miR-145-5p can down-regulate the mRNA(t=-12.824,P<0.001)and protein(t=-4.792,P=0.001)levels of ARK5.The rescuing expression of ARK5 significantly offset the inhibitory effects of miR-145-5p on cell proliferation(t=15.580,P=0.004)and apoptosis(t=-12.470,P=0.006).Conclusion miR-145-5p may inhibit the proliferation and promote the apoptosis of ovarian cancer cells by targeting ARK5.