miR-30e-5p通过靶向PIK3CD介导PI3K/AKT/mTOR信号通路对肝癌细胞侵袭和迁移的影响

Impact of miR-30e-5p on the invasion and migration of hepatocellular carcinoma cells through targeting PIK3CD-mediated PI3K/AKT/mTOR signaling pathway

目的:探讨mi R-30e-5p通过靶向磷酸肌醇-3-激酶催化亚基δ肽(PIK3CD)介导磷酸肌醇3激酶(PI3K)/蛋白激酶B(AKT)/哺乳动物雷帕霉素靶蛋白(mTOR)信号通路抑制肝癌细胞的侵袭、迁移的机制。方法:将Hep G2通过转染相应质粒后分为对照组、miR-30e-5p mimics组、PIK3CD敲低组、阴性对照组、miR-30e-5p mimics+PIK3CD过表达组,实时荧光定量PCR和免疫印迹检测细胞miR-30e-5p、PIK3CD与PI3K/AKT/mTOR信号通路表达;CCK-8法检测各组细胞增殖率;细胞划痕实验和Transwell侵袭实验分别检测各组细胞迁移、侵袭情况;以免疫印迹实验检测各组细胞基质金属蛋白酶(MMP)2、MMP9及E-cadherin、N-cadherin、Vimentin蛋白表达。采用双荧光素酶报告实验检测miR-30e-5p对PIK3CD的靶向调节。结果:与对照组相比,mi R-30e-5p mimics组、PIK3CD敲低组增殖率、迁移率、侵袭数、PIK3CD蛋白与mRNA表达、N-cadherin、MMP2、MMP9、磷酸化PI3K、磷酸化AKT、磷酸化m TOR蛋白表达降低(P<0.05),E-cadherin表达升高(P<0.05)。过表达PIK3CD减弱了miR-30e-5p mimics对肝癌细胞增殖、迁移、侵袭的抑制作用,并升高PI3K/AKT/mTOR通过相关蛋白表达。miR-30e-5p可靶向下调PIK3CD表达。结论:上调miR-30e-5p可通过降低PIK3CD表达而阻止PI3K/AKT/mTOR信号激活,从而抑制肝癌细胞增殖、迁移和侵袭。

Objective:To explore the mechanism of miR-30e-5p inhibiting the invasion and migration of hepatoma cells by targeting phosphoinositide-3-kinase catalytic delta polypeptide(PIK3CD)-mediated phosphoinositide 3-kinase(PI3K)/protein kinase B(AKT)/mammalian target of the rapamycin(mTOR)signaling pathway.Methods:HepG2 cells were divided into control group,miR-30e-5p mimics group,PIK3CD knockdown group,negative control group,and miR-30e-5p mimics+PIK3CD overexpression group by transfecting the corresponding plasmids,the expression of miR-30e-5p,PIK3CD and PI3K/AKT/mTOR signaling pathway was detected by qRT-PCR and Western blot;the proliferation rate of Hep G2 cells in each group was detected by CCK-8 method;cell migration and invasion were measured by cell scratch test and Transwell test;the expression of matrix metalloproteinase(MMP)2,MMP9,E-cadherin,N-cadherin,Vimentin in Hep G2 cells of each group were detected by Western blot.The targeting regulation of miR-30e-5p on PIK3CD in Hep G2 cells was detected by double luciferase report assay.Results:Compared with the control group,the proliferation rate,migration rate,invasion number,the expression of N-cadherin,MMP2 and MMP9 proteins,the expression of PIK3CD protein and mRNA,p-PI3K/PI3K,p-AKT/AKT,and p-mTOR/mTOR in the miR-30e-5p mimics group and PIK3CD knockdown group were lower(P<0.05),the expression of E-cadherin protein was higher(P<0.05).Overexpression of PIK3CD attenuates the inhibitory effects of miR-30e-5p mimics on proliferation,migration and invasion of hepatocellular carcinoma cells and elevates the expression of PI3K/AKT/mTOR pathway-related proteins;miR-30e-5p targets down-regulation of PIK3CD expression.Conclusion:Up-regulation of miR-30e-5p can prevent PI3K/AKT/mTOR signal activation by decreasing the expression of PIK3CD,thereby inhibiting the proliferation,migration and invasion of hepatocellular carcinoma cells.