Effects of Silencing BAK1 and BCL2 Gene Expression on Proliferation, Invasion and Metastasis of HCC HepG2 Cells

Objective:To investigate the effects of silencing BAK1 and BCL2 gene expression on proliferation,invasion and metastasis of hepatocellular carcinoma(HCC)HepG2 cells.Methods:30 HCC HepG2 cells were randomly divided into groups and received the corresponding treatments,namely,control group,NC-siRNA group,BAK1-siRNA group,BCL2-siRNA group and BAK1+BCL2 group,with 6 strains in each group.ThenqRT-PCR,CCK8,Transwell chamber invasion and scratch assay were used to detect the expression,proliferation,invasion and metastasis of BAK1 and BCL2 genes in HepG2 cells.Results:The mRNA expression,cell proliferation rate,cell migration rate and cell invasion ability of BAK1 and BCL2 in HepG2 cells were lowest in the BAK1+BCL2 siRNA group,followed by BCL2-siRNA group,BAK1-siRNA group,NC-shRNA group and control group(P<0.05).The proliferation rate of HepG2 cells in the BAK1+BCL2 siRNA group decreased significantly with time(P<0.05).Conclusion:Silencing the expression of BAK1 and BCL2 genes can inhibit the proliferation and invasion of HCC HepG2 cells and promote their apoptosis.

Bak1腺病毒表达载体的构建及对人成骨肉瘤细胞的影响

目的构建人Bcl2拮抗1(Bak1)基因重组表达腺病毒pAd-Bak1,并感染人成骨肉瘤细胞MG63建立过表达Bak1的细胞模型,检测其对细胞活性的影响。方法利用qPCR扩增Bak1全长cDNA,利用穿梭质粒pENTER构建载有Bak1基因的重组穿梭质粒pENTER-Bak1,通过基因测序鉴定载体序列。将重组载体PmeⅠ线性化、脱磷酸化后,转入含有腺病毒骨架质粒pAd-Amp的感受态BJ5183细胞中进行基因同源重组。将重组腺病毒质粒pAD-Bak1经PacⅠ酶切线性化后,用Lipofectamine 2000脂质体转染到HEK-293细胞中进行包装扩繁,荧光定量PCR法测定病毒滴度。感染MG63细胞,qPCR和Western blot检测Bak1的表达,MTT检测细胞活性。结果测序及酶切验证pENTER-Bak1构建成功。pAD-Bak1感染MG63细胞,qPCR检测到细胞中Bak1基因过表达(与NC对照组和空白对照组相比P<0.01、P<0.01),Western blot检测到细胞中Bak1蛋白过表达。MTT检测显示与NC对照组相比,细胞活性减弱(P<0.05)。结论成功构建了Bak1重组表达腺病毒,验证了其能够感染MG63细胞表达Bak1蛋白,证明了过表达Bak1可以减弱细胞的活性。为进一步研究Bak1的功能奠定了基础。