靶向性血小板衍生生长因子siRNA对肝星状细胞增殖的影响

目的探讨小干扰RNA（siRNA）降低血小板衍生生长因子B链（PDGF-B）基因对肝星状细胞（HSCs）增殖与细胞外基质表达的影响。方法构建PDGF-B靶向siRNA重组表达质粒pSilencer3.l-Hlhygro-PDGF-B siR-NA,将重组质粒转染HSCs细胞,噻唑蓝（MTT）法测定转染后12 h、24 h、36 h、48 h、60 h的增殖抑制率;半定量逆转录聚合酶链反应（RT-PCR）与免疫印迹检测转染后36 h HSCs细胞PDGF-B表达。放免法检测HSCs细胞株上清液中透明质酸和Ⅲ型前胶原的表达。结果经酶切鉴定和测序结果证实PDGF-B靶向siRNA重组表达载体构建成功,转染重组质粒36 h后,PDGF-B siRNA-1、siRNA-2、siRNA-3干预组的HSCs增殖抑制率明显高于对照质粒转染组（34.04%、14.89%、25.53%VS 3.19%;均P〈0.01～0.05）;RT-PCR和免疫印迹显示：各siRNA表达质粒阳性HSCs细胞PDGF-B mRNA和蛋白表达明显降低,与空脂质体组及对照质粒组比较,差异具有统计学意义（均P〈0.05）,放免法显示：siRNAs干预组HSCs细胞透明质酸和Ⅲ型前胶原表达明显降低,与空脂质体组及对照质粒组比较,差异具有统计学意义（均P〈0.05）。结论靶向PDGF-B链的siRNA可降低HSCs的PDGF-B基因表达,具有抑制HSCs增殖和分泌细胞外基质的能力。

Effect of Targeted PDGF siRNA on the proliferation of hepatic stellate cells.

Objective To explore the effects of siRNA-mediated downregulation of platelet-derived growth factor-B chain(PDGF-B) gene expression on the proliferation of hepatic stellate cells.Methods siRNA recombinant expression plasmids targeting PDGF-B gene were constructed and transfected into HSCs.Cell proliferation inhibition was measured at 12,24,36,48 and 60 h after transfection by MTT(thiazoly1 blue) assay.The expression levels of PDGF-B mRNA and protein were detected at 36 h after transfection by semiquantitati...