胎肺间充质干细胞对脐血来源的单个核细胞体外扩增为巨核细胞的影响

Effect of Fetal Lung Mesenchymal Stem Cells on Differentiation of Umbilical Cord Blood Mononuclear Cells into Megakaryocytes

本研究探讨胎儿肺部组织来源的间充质干细胞在无血清条件下体外对脐血单个核细胞诱导扩增为巨核细胞的影响。取脐血单个核细胞,在TPO,IL-l1,肝素的扩增体系中分为2组培养。第1组为脐血单个核细胞单独培养,第2组脐血单个核细胞与间充质干细胞共培养,在第7,10,14天时进行活细胞计数,用流式细胞仪分析CD41a和CD61的表达情况。采用免疫组织化学和透射电子显微镜观察第14天细胞的形态与结构,用流式细胞仪分析细胞DNA含量。结果表明,第2组在第10天时获得的CD41+细胞和CD61+细胞数量最多,分别为第1组的4.5倍和4.7倍;但免疫组织化学和电子显微镜显示,2个组的CD41a+和CD61+细胞的核发育不成熟。结论:胎肺间充质干细胞能有效刺激CD41a+和CD61+细胞生成,但不能促进幼巨核细胞核的发育。

In order to analysis the effect of fetal lung mesenchymal stem cell （FL-MSC） on differentiation of umbilical cord blood mononuclear cells （MNC） into megakaryocytes, the fresh umbilical cord blood MNC were isolated and divided into 2 groups in the culture added with TPO, IL-11 and heparin. In the first group MNC were cultured alone and in the second group MNC were cocultured with FL-MSC. The cells were collected at day 7,10,14 for cell counting and detection of CD41a and CD61 by flow cytometry. The morphology and ultrastructure of megakaryocytes were observed by immunohistochemistry method and transmission electron microscopy at day 14. The content of DNA was analyzed by flow cytometry at day 14 too. The results indicated that the of CD41a^＋ and CD61^＋ cells were obtained mostly in the second group at day 10 and were in 4.5 and 4.7 fold as much as the MNC cultured alone. The morphology and ultrastructure of megakaryocytes showed unmature of nuclei in both of two groups. It is concluded that the FL-MSC could effectively enhance the production of CD41a^＋ and CD61^＋ cells, where the effect on nucleus development of the young megakaryocyte was not obviously shown.