兔骨髓间充质干细胞的分离、体外培养、鉴定和体外标记

目的：探讨分离、体外培养、鉴定及体外标记兔骨髓间充质干细胞（bone marrow-derived mesenchymal stemcells,MSCs）的方法,为进一步的实验研究打下基础。方法：选择健康幼龄新西兰大耳白兔,于双侧髂后上嵴及胫骨上端内侧部行骨髓穿刺提取骨髓。采用全骨髓培养法（直接贴壁法）分离培养MSCs,对第2、3、4、5、6代MSCs应用MTT法测定生长曲线,分析MSCs的生长规律。对MSCs进行形态学观察,通过流式细胞术对CD34、CD44、CD45、CD105这4种MSCs表面抗原进行鉴定,证明所培养的细胞为MSCs。采用5-溴脱氧尿嘧啶核苷（5-Bromo-2-deoxyuridine,BrdU）体外标记兔MSCs,检测其标记阳性率。结果：全骨髓培养法培养的原代MSCs接种4天后可以被观察到,形态均匀成梭形,生长增殖迅速,符合MSCs生长的特性,7～8d MSCs融合接近80%,传代培养生长良好。MSCs生长曲线呈S型,由生长曲线分析可知,MSCs在培养第4～8d为高速生长期,MSCs在第3～5代生长最为旺盛。经流式细胞术鉴定,CD34（-）、CD45（-）、CD44（＋）、CD105（＋）,证明所培养的细胞为较纯的MSCs。BrdU体外标记兔MSCs的阳性率达到85%～90%。结论：应用本实验方法,可以分离、纯化培养兔骨髓间充质干细胞且操作简便,效率高,经济实用。所培养的MSCs体外生长稳定、增殖速度快、贴壁率高、可连续传代,可用于MSCs功能及应用的进一步研究。应用BrdU体外标记兔MSCs是安全可靠的。

Isolation,culture,identification and labeling of bone marrow-derived mesenchymal stem cell of rabbit in vitro

Objective:To explore a method of isolation,purification and culture of bone marrow-derived mesenchymal stem cells(MSCs) of rabbits in vitro for the sake of further study.Methods:Bone marrow tissue was harvested from bilateral posterior iliac crest and tibias bone of young New Zealand white rabbit.MSCs were isolated and proliferated by the method of whole bone marrow culture.Growth curves of the 2nd,3rd,4th,5th and 6th generation MSCs were drawn by MTT method. CD34,CD44,CD45,CD105 antigens of MSCs were ident...