miR-17-5p 靶向MICB 减弱NK 细胞对肝癌细胞的毒性作用

目的:探讨miR-17-5p 在肝细胞癌(HCC)HepG2 细胞对NK 细胞介导的细胞毒性敏感性中的调控作用。方法:使用含野生型MICB 基因3忆UTR 序列、突变型MICB 基因3忆UTR 序列、miR-17-5p mimic 序列、miR-17-5p-NC 序列、anti-miR-17-5p 序列的质粒载体分别或共转染HCC HepG2 细胞,使用丙戊酸钠处理转染或未转染细胞。应用荧光素酶活性测定检测miR-17-5p 对MICB 的调控作用。应用实时荧光定量PCR 或蛋白免疫印迹检测细胞或组织中miR-17-5p 及MICB mRNA 和蛋白表达情况。结果:淤与miR-17-5p-NC 组相比,miR-17-5p-mimic 组HepG2 细胞中miR-17-5p 表达水平显著升高,MICB mRNA和蛋白表达水平均显著降低(P<0.05);与anti-miR-17-5p-NC 组相比,anti-miR-17-5p 组HepG2 细胞中miR-17-5p 表达水平均显著降低,MICB mRNA 和蛋白表达水平均显著增加(P<0’05)。与miR-17-5p-NC+MICB 3’UTR-Wt 组相比,miR-17-5p-mimic+MICB 3’-UTR-Wt 组荧光素酶活性显著降低(P<0.05)。miR-17-5p-NC+MICB 3’UTR-Mut 组与miR-17-mimic+MICB 3’-UTR-Mut组的荧光素酶活性差异无统计学意义(P>0.05)。于与对应癌旁非肿瘤组织相比,miR-17-5p 在HCC 组织中的表达水平显著增加,而MICB 蛋白表达水平显著降低(P<0.05)。miR-17-5p 和MICB 蛋白的表达与肿瘤直径、远处转移、TNM 分期、分化程度等临床病理特征有关(P<0.05)。在HCC 肿瘤组织中miR-17-5p 与MICB 蛋白表达水平呈明显负相关(P<0.05)。 与miR-17-5p-NC 组相比,miR-17-5p-mimic 组MICB 蛋白表达水平均显著降低(P<0.05)。与miR-17-5p-mimic+MICB 3’UTR-Mut组相比,miR-17-5p-mimic+MICB-3’UTR-Wt 共转染组中NK 细胞毒性和MICB 蛋白表达水平均显著增加(P 均<0.05)。与anti-miR-17-5p-NC 组相比,anti-miR-17 组NK 细胞毒性和MICB 蛋白表达水平均显著增加(P 均<0.05)。 与丙戊酸钠+miR-17-5p-NC 组相比,丙戊酸钠+miR-17-5p-mimic 组细胞中MICB 表达水平显著降低(P<0.05)。在不同效靶比时,与Ctrl 组相比,丙戊酸钠组NK 细胞毒性显著增加(P<0.05)。与丙戊酸钠+miR-17-5p-NC 组相比,丙戊酸钠+miR-17-5p-mimic 组NK 细胞毒性显著降低(P<0.05)。结论:miR-17-5p 通过靶向MICB 降低HepG2 细胞对NK 细胞介导的细胞毒性敏感性,从而抑制NK 细胞对肝癌细胞的毒性。

Effects of long-chain non-coding PCA3 targeting miR-194 expression on proliferation and apoptosis of prostate cancer cells

Objective:To investigate the effect and mechanism of long-chain non-coding PCA3 targeting miR-194 expression on proliferation and apoptosis of prostate cancer cells through ERK signaling pathway.Methods: The expression of PCA3 and miR-194 in different prostate cancer cells was detected by qPCR.Double luciferase reporter gene was used to detect the interaction between PCA3 and miR-194.Clonal assay and apoptotic test were used to inhibit the proliferation and apoptosis of prostate cells after overexpression of miR-194.Western blot was used to detect the expression of ERK signal pathway protein after PCA3 and the expression of ERK signal pathway protein after overexpression of miR-194.The effect of PCA3 on tumorigenesis of prostate cancer cells was detected by tumor formation in nude mice.Results: Compared with other prostate cancer cells,the expression level of PCA3 was the highest in LNCaP cells and the expression level of miR-194 was lower.Double-luciferase assay confirmed that PCA3 can regulate the expression and activity of miR-194,inhibition of PCA3 expression can attenuate the proliferation of prostate cancer cells and enhance the apoptotic behaveior.Overexpression of miR-194 could enhances the proliferation of prostate cancer cells.Inhibition of PCA3 expression could down-regulate the expression of ERK signaling pathway and inhibit the activation of ERK signaling pathway.At the same time,overexpression of miR-194 could reverse the inhibitory effect of PCA3 on ERK signaling pathway.Inhibition of PCA3 expression could effectively weaken the prostate cancer cells in vivo tumorigenic ability.Conclusion: PCA3 can regulate the proliferation and apoptosis of prostate cancer cells through the regulation of miR-194 through ERK signaling pathway.