人胚胎干细胞体外培养及特性分析

目的探讨人胚胎干细胞(human embryonic stem cells,hESCs)的体外培养及其特性。方法 hESCs接种于饲养层细胞,培养液为含20%Knockout SR的Knockout DMEM,其中添加10 ng/mL碱性成纤维细胞生长因子(bFGF),通过观察细胞形态、免疫细胞化学技术分析hESCs表面标志分子SSEA-3、SSEA-4、SSEA-1和TRA-1-60的表达,鉴定hESCs的未分化状态;G显带技术分析细胞染色体核型。同时,通过分析hESCs体外形成胚胎体、体内生成畸胎瘤的情况,鉴定hESCs的分化潜能。结果 hESCs在饲养层细胞上呈克隆生长,细胞为二倍体核型。hESCs表达SSEA-3、SSEA-4、以及TRA-1-60细胞表面特征性标志。体内、外分化实验证实hESCs具备多分化潜能。结论 hESCs在体外培养条件下能够保持未分化状态和发育的全能性,为进一步探索hESCs的诱导分化,以及hESCs的应用研究提供可行性保证。

Characterization and culture of human embryonic stem cells

Objective To explore the in vitro maintenance and characterization of human embryonic stem cells(hESCs).Methods hESCs were cultured on feeder layer with ES culture medium,which consists of 20% Knockout Serum Replacement,Knockout DMEM and 10 ng/mL bFGF.Undifferentiated status of hESCs was identified by cell morphology,and the expressions of cell surface marker SSEA-1,SSEA-3 and TRA-1-60.G banding technique was employed for cell karyotype analysis.Pluropotency of cells were analyzed via in vitro embyoid body(EB) formation and in vivo terotoma formation.Results Most of cells showed undifferentiated properties in cell morphology and normal karyotype throughout extended culture periods.They maintained undifferentiated status with positive immunoreactivity to SSEA-3,SSEA-4 and TRA-1-60.in vitro EB formation and in vivo teratoma formation demonstrated the pluripotency of human ES cells.Conclusion The fundamental requirement to hESCs for research and clinical application were their undifferentiated status and pluropotency in culture.Our result demonstrated their potential for these purposes.