大鼠脂肪组织来源的间充质干细胞向心肌样细胞分化的细胞特征

目的探索大鼠脂肪组织来源的间充质干细胞(ADMSCs)向心肌细胞定向诱导分化的细胞特征。方法胰酶消化法分离出ADMSCs,对培养第3代细胞分别进行HE染色和CD44免疫细胞化学染色,利用光镜和激光共聚焦扫描显微镜观察其细胞特征和CD44的表达;5-氮杂胞苷(5-aza)诱导,应用肌球蛋白重链(MHC)抗体进行免疫细胞化学染色,鉴定分化后的心肌样细胞;利用免疫组织化学观察脂肪组织中CD44阳性细胞的表达分布。结果大鼠脂肪组织分离的细胞生长迅速,培养后分为两类:一类为大型细胞,其数量较多、体积较大;另一类为小型细胞,其数量较少、体积较小。免疫细胞化学和激光共聚焦显微镜观察显示大细胞呈CD44弱阳性反应,小细胞呈强阳性反应。5-aza诱导后,发现7处细胞团明显分化为心肌样细胞,肌球蛋白呈强阳性反应。HE染色显示呈典型的心肌细胞的特征。脂肪组织中CD44阳性细胞位于脂肪小叶之间,数量较少,形态较小。结论培养的大鼠脂肪组织来源的ADMSCs分为大、小两类,小型细胞可能具有较强的分化为心肌样细胞的能力。

CELLULAR FEATURES OF RAT ADIPOSE TISSUE-DERIVED MESENCHYMAL STEM CELLS DIFFERENTIATED INTO CARDIOMYOCYTE-LIKE CELLS IN VITRO

Objective To explore the features that rat adipose tissue-derived mesenchymal stem cells(ADMSCs)can be induced to cardiomyocytes-like. Methods ADMSCs were separated by trypsinization, and then the 3rd generation cells were stained respectively by HE staining and CD44 immunocytochemical staining, which were observed by light microscopy and laser confocal microscopy. After induction with 5-aza, the antibody of MHC (Myosin Heavy Chain) was used to identify the cells which were induced to differentiate. Immunoh...