关键词:
转化生长因子β1
转化生长因子β3
基质金属蛋白酶-2
基质金属蛋白酶-9
金属蛋白酶组织抑制剂-1
摘要:
目的 观察重组转化生长因子β1(tgfβ1)和β3(tgfb3)基因对大鼠肝星状细胞株(hsc-t6)的基质金属蛋白酶-2(mmp-2)、基质金属蛋白酶-9(mmp-9)及金属蛋白酶组织抑制剂-1(timp-1)表达的影响.方法 (1)构建质粒pcdna3.1(+)-tgfb,和pedna3.1(+)-tgfβ3;(2)瞬时转染:将pcdna3.1(+)-tgfβ1和pedna3.1(+)-tgfβ3分别及共同转染hsc-t6细胞,荧光定量pcr法和免疫印迹法检测转染后24、48和72 h时mmp-2、mmp-9、timp-1 mrna和蛋白的表达;(3)稳定转染:pcdna3.1(+)-tgfβ1转染hsc-t6细胞,经筛选建立高表达tgfβ1的hsc-t6细胞克隆,pcdna3.1(+)-tigfβ3转染细胞克隆,48 h后检测mmp-2、mmp-9和t1mp-1的表达.结果 (1)tgfβ1转染细胞后,mmp-2和timp-1明显增高(p<0.05),mmp-9无变化;tgfβ3转染细胞后,mmp-2和mmp-9无变化,timp-1 mrna也无变化,但timp-1蛋白明显增高(p<0.05);共转染组的mmp-2较空白组和对照组明显增加(p<0.05),mmp-9无改变,timp-1较tgfβ1转染组明显下降(p<0.05).(2)tgfβ3转染克隆细胞后,mmp-2无明显变化,mmp-9明显增加(p<0.05),timp-1明显下降(p<0.05).结论 重组tgfβ3基因可能通过促进mmp-2或mmp-9的活性和抑制timp-l的活性而发挥抗肝纤维化作用.
abstract:
objective to investigate the effects of transforming growth factorβ1(tgfβ1)and β3 (tgfβ3)gene transfer on mmp-2,mmp-9 and timp-1 expression in hepatic stellate cells(hsc-t6).methods tgfβ1 and tgfβ3 expression plagmids were *** recombinant expression plasmid pcdna3.1(+)-=tgfβ1 and pcdna3.1(+).tgfβ3 were transfected or cotransfected into *** 24,48 and 72 h after transfection,the expression of mmp-2,mmp-9 and timp-1 mrna were detected by real-time quantitative pcr,and the expression of mmp-2,mmp-9 and timp-1 protein were detected by western *** recombinant expression plasmid pcdna3.1(+).tgfβ1 was transfected into hsc-t6,and positive clones were selected by *** positive clones were transfected by the recombinant expression plasmid pcdna3.1(+).tgfβ1,and the expression of mmp-2,mmp-9 and timp-1 were detected at 48 h after *** after transfection with pedna3.1-tgfβ1,mmp-2 and timp-1 increaged remarkably in hsc-t6 cells(p<0.05),but mmp-9 remained at the sanle level;after transfection with pcdna3.1-tgfβ3,expression levels of mmp-2,mmp-9 and timp-1 mrna were not changed,but timp-1 protein increased remarkably(p<0.05);in cotransfection group,the expression of mmp-2 was higher than that in the blank and the control groups(p<0.05),but mmp-9