[Objective] The aim of this study was to establish the in vitro culture system of chicken fibroblasts.[Method] Tissue explant method and enzymatic digestion method were used to separate and culture chicken skin fibroblasts respectively.The rate of cell growth,cryopreservation and recovery were compared.[Result] The primary chicken fibroblasts prepared by enzymatic digestion grew faster and converged together to form monolayer on 5 d post preparation;the passage cells prepared by these 2 methods grew at similar speed and formed monolayer within 2-3 d;homogeneous fibroblasts could be obtained by trypsin digestion and repeated attachment for 3-4 passages;there were 75%-80% of cells survived after cryopreservation and recovery;the growth curves of embryonic fibroblasts and skin fibroblasts were all normal and the two kind of cells still retained the normal number of chromosomes even at the twelfth passage.[Conclusion] The feeder layer cells needed for establishing ES cell lines could be obtained by culturing chicken fibroblasts through both tissue explant method and enzymatic digestion method.This study provided a basis for the successful establishment of ES cell lines.
目的观察过氧化物酶体增殖激活受体γ(PPARγ)的配体曲格列酮(troglitazone,TGZ)对胃癌SGC-7901细胞凋亡的影响。方法体外培养人胃癌SGC-7901细胞,SGC-7901细胞分为对照组和曲格列酮不同浓度(5、10、15、20μmol/L)加药组,应用流式细胞仪检测曲格列酮不同浓度对胃癌SGC-7901细胞凋亡率的影响;RT-PCR及W estern b lot方法观察PPARγ、p53的mRNA及蛋白表达变化。结果曲格列酮可诱导胃癌SGC-7901细胞凋亡,凋亡率与浓度呈正相关;曲格列酮干预后,p53的mRNA及蛋白在胃癌SGC-7901细胞中表达上调,而PPARγ的mRNA及蛋白表达水平无明显改变。结论曲格列酮依赖激活PPARγ能在体外诱导胃癌细胞凋亡,其机制可能是通过上调抑癌基因p53表达而实现,提示PPARγ可能是胃癌治疗的一个新分子靶点。
