摘要
本研究旨在对骨髓间充质干细胞(mesenchymal stem cells,MSC)进行移植前增殖分化能力测定,病毒学检查,核型分析,PCR-STR和HLA的检测,以便为临床应用提供安全、可靠的移植细胞。采用贴壁法分离骨髓MSC,在相同条件下分别考察各代细胞形态、生长、表面标记、成骨、成脂分化能力的变化情况,并进行不同生长时期的核型分析,利用HLA-SBT技术检测4个不同供者来源的MSC的HLA-I和HLA-II位点的高分辨分型;应用PCR-STR技术检测4个不同供者来源的MSC基因遗传标记。并且利用ELISA方法检测HIV,HBV,HCV和TP,使用PCR方法检测支原体污染。结果表明:随着传代次数增加,MSC的增殖能力、成骨能力均有所下降。在扩增过程中,MSC始终保持较高的纯度,CD29、CD44、CD105、CD166、CD73均表达阳性,CD14、CD34、CD45、CD80和CD86均表达阴性。在8代以前未发现核型变异。4个不同供者来源的MSC的HLA高分辨分型和STR基因分型结果为MSC3的TP表达阳性,MSC2在5代出现支原体污染。结论:在体外培养过程中MSC干细胞特性逐渐丢失,其中向成骨方向的分化潜能降低。MSC在8代以前可作为实验研究及临床应用的良好对象。
This study was aimed to investigate the characteristics of human bone marrow mesenchymal stem cells during ex-vivo expansion, MSCs were isolated from human bone marrow. At each passage, the characteristics of proliferation kinetics, osteogenic and adipogenic differentiation potential were analyzed, and cell morphology, surface markers were investigated as well. The karyotype analysis was done in different passage cells. The infection HIV, HCV, HBV and TP were detected by ELISA. Mycoplasma contamination in vitro was detected by PCR method. HLA-SBT was used to reanalyze the results of HLA antigens and alleles. STR genetic loci were detected by PCR in the MSC1, MSC2, MSC3 and MSC4. The results indicated that the proliferative ability and osteogenic potential decreased with the increase of passage number during culture expansion. The multiple differentiation potential of MSCs was maintained during their life span. Karyotype analysis showed that MSCs from 4 groups before passsage 8 were normal. The expression of CD29, CD44, CD105, CD166 and CD73 were positive. The expression of CD14, CD34, CIM5, CD80, CD86 were all negative. SBT was used to identify HLA-A, B, Cw, DRB1 , DRPB1, DQ alleles in the MSC1, MSC2, MSC3, MSC4. The genetype of STR in the MSC1 ,MSC2 ,MSC3 ,MSC4 was different. MSC 3 was examined by TP-ELISA to confLrm the infectious disease of TP. MSC2 was contaminated by mycoplasma at passage 5. It is concluded that culture expansion causes MSCs to gradually lose their stem cell properties. During ex-vivo expansion of MSCs, the osteogenic differentiation potential is decreased. MSCs before passage 8 can be a valuable subject for basic research and clinical application.
出处
《中国实验血液学杂志》
CAS
CSCD
2008年第3期639-644,共6页
Journal of Experimental Hematology
基金
广东省医学科学技术研究基金资助项目(编号GDWSTJJ342128197410280329)
广州市医药卫生项目资助项目(编号2006-YB-140)
