摘要
目的观察体外培养人骨髓间充质干细胞(MSCs)的形态和生长规律,以证实人MSCs是一种理想的种子细胞,以及为进一步深入研究提供基础理论依据。方法对人骨髓淋巴细胞分离液采用密度梯度离心法和差异贴壁法进行分离、提纯MSCs。观察原代、传代细胞的结构、生长情况,对第2代MSCs表面抗原进行测定。结果MSCs原代培养第14～16d时细胞融合成单层,传代细胞保持原代细胞的形态特征。超微结构显示:第2代MSCs细胞核形态不规则,部分核可见多个核仁,胞质内细胞器形态分化幼稚。细胞的生长曲线显示:传代第3d起呈对数生长,第5d达到高峰,10代后无明显克隆出现。P1代克隆形成率为25.83%±2.93%,P5代为14.67%±1.63%,P10代为4.67%±0.52%。MSCs的表型特征显示细胞均一性较好,MSCs表达CD29,CD44,但不表达CD34,CD45。结论用淋巴细胞分离液密度梯度离心和贴壁筛选法,可分离、纯化人MSCs,方法简单、经济,易应用;MSCs增殖能力强,可在体外大量扩增,能满足组织工程的要求,是理想的种子细胞之一。
Objective To observe the morphology and growing status of mesenchymal stem cells（MSCs） of human bone marrow in vitro, in order to confirm that MSCs of human bone marrow are ideal seed cells and provide basic theory for further MSCs research. Methods The methods of density gradient centrifugation with lymphocyte separation medium for human and adherent filtration were used to isolate and purify MSCs of human bone marrow. We observed the cellular growth status and morphology of the primary MSCs and the surface antigens of second passage MSCs were tested. Results The primary culture cells fused into monolayer after 14-16 d. The passage cells kept the same morphological characteristics of primary culture cells. Ultrastructure of the second passage MSCs showed that the shape of nuclei was irregular, there were multiple nucleoli in some of the nuclei, and morphological differentiation of intracytoplasm organelles was immature. The growth curve of the first, fifth and tenth passage cells showed a logarithmic growth at day 3, a peak growth at day 5, and no clones occurred after tenth passage. Cloning efficiency of first passage, fifth passage and tenth passage was respectively 25.83%±2.93%, 14.67%±1.63% and 4.67%±0.52%. Test of MSCs phenotypic characteristics showed a high homogeneity among the cells and surface antigen profiles were positive for CD29, CD44 and negative for CD34, CD45. Conclusion The methods of density gradient centrifugation with lymphocyte separation medium for human and adherent filtration are simple, economic and efficient to isolate and purify MSCs from human bone marrow. With a high proliferating ability in vitro, MSCs from human bone marrow are ideal seed cells for tissue engineers.
出处
《中国胸心血管外科临床杂志》
CAS
2010年第1期41-45,共5页
Chinese Journal of Clinical Thoracic and Cardiovascular Surgery
基金
沈阳军区总医院重点医学科研基金资助项目(2006Y-Z07)~~
关键词
骨髓间充质干细胞
人
细胞培养
鉴定
体外
Mesenchymal stem cells of bone marrow
Human
Cell cultivation
Identification
In vitro
