悬浮组织块法分离培养SD 大鼠脂肪干细胞的实验研究

目的:建立SD 大鼠脂肪干细胞悬浮组织块分离培养法。方法:取正常SD 大鼠股沟处脂肪组织,用悬浮组织块法和组织块贴壁法分离培养SD 大鼠脂肪干细胞,观察细胞的生长状况及形态特征。取第3 代对数期细胞,CCK-8 法绘制其生长曲线;免疫荧光法检测其表面抗原CD29、CD44、CD45 的表达情况;分别用成脂、成骨诱导培养液进行诱导分化,油红O、茜素红染色定性鉴定。结果:两种方法体外培养得到的SD 大鼠脂肪干细胞形态为梭形纤维样,生长力旺盛,生长曲线为典型的“S冶型;免疫荧光法检测显示第3 代细胞强表达CD29、CD44,CD45 表达阴性;细胞成脂诱导培养14 d 后,油红O 染色为阳性;成骨诱导培养14 d 后,茜素红染色为阳性。结论:悬浮组织块法可以分离培养出SD 大鼠脂肪干细胞,方法简便,为体外分离培养SD 大鼠脂肪干细胞提供了一种新的方法。

An experimental study of isolation of SD rat adipose-derived stem cells using sus-pended explant culture method

Objective:To isolate SD rat adipose-derived stem cells(ASCs)by suspended explant culture method.Methods:The healthy rat inguinal fat pads were obtained.The SD rat ASCs were isolated by suspended explant culture method and explants adherent culture method.The growth status and morphology were observed.The growth curve and cell surface markers CD29,CD44,CD45 of the 3rd passage cells were analyzed respectively by CCK-8, immunocytochemistry; the 3rd passage cells were induced individually by adipogenic differentiation medium and osteogenic differentiation medium,and cells were examined by oil red O staining and alizarin red staining.Results: The SD rat ASCs obtained by the two methods exhibited a spindle-shaped appearance and could rapidly expand.The cell growth curves were typical of "S" type.Immunocytochemistry analysis revealed that the third passage of SD rat ASCs were positive for CD29,CD44,but were negative for CD45.SD rat ASCs were positive for oil red O staining at 14 days after adipogenic induction,and positive for alizarin red staining at 14 days after osteogenic induction.Conclusion: Isolation of SD rat ASCs by suspended explant culture method is successfully established.The method is simple.It provides a new method for the isolation of SD rat ASCs in vitro.