目的:观察FHL1(Four and a half LIM domains protein1)基因在P19细胞向心肌细胞诱导分化过程中表达水平的变化,探讨FHL1基因与心肌细胞分化之间的关系。方法:P19细胞经1%二甲基亚砜(DMSO)诱导悬浮培养4天形成细胞聚集体,将聚集体用生...目的:观察FHL1(Four and a half LIM domains protein1)基因在P19细胞向心肌细胞诱导分化过程中表达水平的变化,探讨FHL1基因与心肌细胞分化之间的关系。方法:P19细胞经1%二甲基亚砜(DMSO)诱导悬浮培养4天形成细胞聚集体,将聚集体用生长培养基黏附培养至14天,观察细胞跳动情况,用肌钙蛋白I(cTnI)抗体行Western Blot以鉴定心肌细胞分化,并采用RT-PCR、Western Blot技术在细胞分化成熟的不同时段检测P19细胞中FHL1基因mRNA和蛋白的表达水平。结果:DMSO诱导4天后,用生长培养基黏附培养至第8天,P19细胞出现自发性节律跳动的细胞团片,Western Blot检测cTnI蛋白呈阳性。FHL1基因在P19细胞向心肌细胞分化过程中,随细胞分化成熟该基因表达水平逐渐上调,Western Blot检测结果与RT-PCR检测结果基本一致。FHL1基因在分化第0～8天表达显著增高,各时间点之间差异显著(P<0.05);第8～14天表达趋于稳定,各时间点之间差异无显著性(P>0.05)。结论:FHL1基因在P19细胞向心肌细胞分化过程中表达逐渐上调,可能参与心肌细胞的分化和发育。展开更多
To investigate the effect of cell cycle inhibitor p19ARF on replicative senescence of human diploid cell, recombinant p19ARF eukaryotic expression vector was constructed and p19ARF gene was transfected into human dipl...To investigate the effect of cell cycle inhibitor p19ARF on replicative senescence of human diploid cell, recombinant p19ARF eukaryotic expression vector was constructed and p19ARF gene was transfected into human diploid fibroblasts (WI-38 cells) by liposome-mediated transfection for overexpression. Then, the effects of p19ARF on replicative senescence of WI-38 cells were observed. The results re- vealed that, compared with control cells, the WI-38 cells in which p19ARF gene was introduced showed significant up-regulation of p53 and p21 expression level, decrease of cell generation by 10 12 generations, decline of cell growth rate with cell cycle being arrested at G1 phase, increase of positive rate of senescent marker SA-β-gal staining, and decrease of mitochondrial membrane potential. The morphology of the transfected fibroblasts presented the characteristics changes similar to senescent cells. These results indicated that high expression of p19ARF may promote the senescent process of human diploid cells.展开更多
基金the National Key Basic Research Development Program of China: Basic research for mechanism of senescence and intervention (973 Program) (Grant No. 2007CB507400), National Natural Science Foundation of China (Grant Nos. 30070288 and 30270505), and creative research group fund from NSFC (Grant No. 30121005)
文摘To investigate the effect of cell cycle inhibitor p19ARF on replicative senescence of human diploid cell, recombinant p19ARF eukaryotic expression vector was constructed and p19ARF gene was transfected into human diploid fibroblasts (WI-38 cells) by liposome-mediated transfection for overexpression. Then, the effects of p19ARF on replicative senescence of WI-38 cells were observed. The results re- vealed that, compared with control cells, the WI-38 cells in which p19ARF gene was introduced showed significant up-regulation of p53 and p21 expression level, decrease of cell generation by 10 12 generations, decline of cell growth rate with cell cycle being arrested at G1 phase, increase of positive rate of senescent marker SA-β-gal staining, and decrease of mitochondrial membrane potential. The morphology of the transfected fibroblasts presented the characteristics changes similar to senescent cells. These results indicated that high expression of p19ARF may promote the senescent process of human diploid cells.
