酶预消化连续组织块法培养大鼠脂肪来源干细胞的研究

目的 采用胰蛋白酶+I型胶原酶预消化后连续组织块法进行SD大鼠脂肪来源干细胞的体外培养,并和Zuk的胶原酶消化法培养效果相比较,为脂肪来源干细胞的体外培养方法提供参考依据.方法 取1月龄SD大鼠腹股沟处脂肪组织,分A、B两组.A组使用D-Hank's液冲洗净后剪成8mm3左右组织块.0.25%胰蛋白酶消化5min后,0.1%I型胶原酶消化组织块20min,将组织块置于孔径1mm的尼龙网放至培养皿贴壁培养,3-4d后将组织块连同滤网放至下一培养皿中以连续组织块法培养3-4次.B组使用Zuk的胶原酶消化法培养.采用MTT检测方法对细胞增殖活性进行比较,流式细胞仪检测脂肪干细胞表面标志.结果 A、B两组培养的细胞均具有典型的干细胞形态特征,生长曲线相似,脂肪干细胞标志CD105、CD44呈阳性表达.结论 采用酶预消化连续组织块法可以进行脂肪来源干细胞的培养,并且能在短时间内获得多个脂肪干细胞样本,具有一定的应用价值.

Culture of rat adipose-diverted stem cells by serial explant after enzymatic predigestion

Objective To isolate and culture adipose-diverted stem cells (ADSCs) in SD rats using serial explant after enzymatic predigestion, and compare, the results with that from Zuk's method. Methods Adipose tissue from groin area of one-month-old SD rats was divided into two groups. In group A, the adipose tissue was snipped into 8mm3 blocks after washed with D-Hank's solution. The tissue blocks were digested by 0.25% trypsin for 5 minutes and 0.1% collagenase type 1 for 20 minutes, and put on 1mm grid nylon net for 3 to 4 days of cultivation. The tissues were then removed to another culture flask. They were repeatedly cultured by serial explant method for three or four times. In group B, the adipose tissue was treated by Zuk's method. MTT was used to measure bioactivity of the culture and flow cytometry was used to detect surface markers of the stem cells. Results In both groups, the cells had typical morphological characteristics of stem cells and expressed adipose stem cell surface markers CD105 and CD44. Conclusion The adipose-diverted stem cells cultured by technique of enzymatic digestion and serial explant in vitro have the same characteristics of those cultured with Zuk's method. This technique can yield plenty of ADSCs samples during a short period of time and thus enables its practical use in ADSCs cultivation.