体外RNA干扰下调黏着斑激酶表达对HSC-T6细胞黏附与迁移的影响

目的 探讨特异性阻断黏着斑激酶(FAK)表达对纤维连接蛋白刺激的肝星状细胞(HSC-T6)黏附与迁移的影响.方法 构建靶向FAK的RNA干扰重组体,在阳离子聚合物介导下转染大鼠肝星状细胞系HSC-T6,筛选出可高效抑制FAK表达的重组质粒;荧光实时定量PCR和Western blot检测FAK基因敲除效果;甲苯胺蓝染色法检测细胞黏附,划痕修复实验和改良的Boyden双腔系统检测细胞迁移.多组间均数差异性比较采用单因素方差分析.结果 成功构建并筛选出可高效抑制FAK的质粒表达载体.质粒转染后,FAK mRNA和蛋白表达分别下降了76.82%和72.53%,同时,p-FAK(Tyr397)蛋白表达下降了62.71% FAK表达下调可明显抑制HSC-T6细胞黏附,抑制率约58.69%;FAK基因沉默可显著抑制纤维连接蛋白诱导的HSC迁移,使细胞迁移距离降低了58.27%,跨膜迁移细胞数减少了83.70%. 结论 RNA干扰技术可选择性下调HSC中FAK的表达,并可显著抑制HSC-T6的黏附和迁移.

The influence of down-regulation of focal adhesion kinase by RNA interference on the adhesion and migration of rat hepatic stellate cells in vitro

Objective To investigate the role of fecal adhesion kinase (FAK) in adhesion and migration of hepatic stellate cells (HSC). Methods Two recombinant plasmids expressing short hairpin RNAs (shRNAs) targeting FAK were constructed and one plasmid substantially suppressing FAK expression in HSC was selected. Real-time PCR and Western blot were used to detect the knockdown effects of FAK gene. After 48-hour treatment with FAK shRNA, toluidine blue colorimetric assay was used to detect the cell adhesion. Wound-healing assay and improved Boyden double-chamber were used to detect the cell migration induced by FN. Results The recombinant plasmid expressing FAK shRNA was successfully constructed and trausfected into HSC. Compared with the controls, the expression ofFAK mRNA and protein in HSC treated with FAK shRNA was markedly down-regulated by 76.82% and 72.53%, respectively. The expression ofp-FAK (Tyr397) protein was also decreased by 62.71% 48 h posttransfection. The adhesion of HSC was inhibited by 58.69% at 48 h after shRNA transfection. FAK gene silencing could also dramatically inhibit FN-stimulated HSC migration, and the cell migration distance and the cell number of crossing membrane were decreased by 58.27% and 83.70%, respectively. Conclusions FAK gene silencing suppresses adhesion and migration of HSC, and FAK may be a potential target for novel anti-fibrosis therapies.