摘要
目的：用胚胎干细胞（ＥＳＣ）体外诱导分化为心肌细胞，从分子水平上研究早期心脏发育相关基 因及其功能。方法：（１）胚胎干细胞的培养。（２）胚胎于细胞的分化培养。（３）被分化的心肌细胞鉴定：ＲＮＡ的 提取；心脏特异性引物的合成和ＲＴ－ＰＣＲ反应；探针标记、纯化和比放射活性测定；ＲＮＡ斑点杂交。结果：用最 适条件培养液对ＦＳＣ定向诱导分化，可使８０％以上的ＥＳＣ分化为心肌细胞。心肌细胞以同步的方式进行收缩。 反转录ＰＣＲ和斑点杂交的结果显示：心肌在早期发育就开始表达其特异性基因。结论：胚胎干细胞体外能诱导 分化为心肌细胞。胎牛血清、二甲基亚砜和维甲酸的浓度及它们之间的组成不同，对ＥＳ细胞定向诱导为心肌 细胞均有影响。最佳诱导条件是用２ｎｍｏｌ／Ｌ维甲酸、０．６％二甲基亚砜和２０％胎牛血清组成的条件培养液。
AIM: To study cellular and molecular mechanisms of cardiac development associated genes ex- pression and its function during early stage cardiomyogenesis. METHODS: (1 ) Mouse embryonic stem cells (ESC) line D3 culture. (2) Inductive culals of ESC differentiated into cardiac myocytes in vitro.(3) Identification of ESC -derived cardiac myocytes: RNA isolation; synthesis of specific primer and RT - PCR; Label of RT - PCR products with [α - 32P] dATP as probes, purifyed by sephadex G - 50 columns, determined the yield of DNA. RNA dot hy- bridization. RESULTS: 80% of ESC differentiated into cardiomyocytes by improved conditional medium. Cardiomy- ocytes contraCted in a synchronous manner. The results of RT - PCR and RNA blot showed that cardiac genes were expressed abundantly and specifically during the early cardiomyogenesis. CONCLUSIONS: ESC were able to be dif- ferentiate into cardiomyocytes. Different concentrations and components of RA, DMSO and FCS affected ESC car- diomyogenesis in de. The optimal result obtained was from the conditional medium, a mixturce of 2 nmol/L retinoic acid (RA), 0.6% dimethyl sulfoxide (DMSO) and 20% fend calf serum (FCS).
出处
《中国病理生理杂志》
CAS
CSCD
北大核心
2000年第5期389-392,共4页
Chinese Journal of Pathophysiology
基金
国家攀登计划基金资助
