摘要
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（HSCT6）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，FAKmRNA和蛋白表达分别下降了76．82％和72．53％，同时，PFAK（Tyr^397）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HSCT6的黏附和迁移。
Objective To investigate the role of focal 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 transfected into HSC. Compared with the controls, the expression of FAK mRNA and protein in HSC treated with FAK shRNA was markedly down-regulated by 76.82% and 72.53%, respectively. The expression of p-FAK （Tyr^397） 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.
出处
《中华肝脏病杂志》
CAS
CSCD
北大核心
2009年第7期509-514,共6页
Chinese Journal of Hepatology
基金
河北省自然科学基金（C2008001133）
关键词
肝星状细胞
黏着斑激酶
RNA干扰
黏附
迁移
Hepatic stellate cells
Focal adhesion kinase
RNA interference
Adhesion
Migration
