Chinese Journal of Tissue Engineering Research ›› 2014, Vol. 18 ›› Issue (37): 5947-5954.doi: 10.3969/j.issn.2095-4344.2014.37.008
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Wu Jie-ying1, Lu Yan1, Chen Jin-song1, Zhu Lu2, Gan Wen-ting2
Revised:
2014-08-12
Online:
2014-09-03
Published:
2014-09-03
About author:
Wu Jie-ying, Master, Senior technologist, Guangzhou Cord Blood Bank, Guangzhou Women and Children’s Medical Center, Guangzhou 510623, Guangdong Province, China
Supported by:
the Project of Guangdong Science and Technology Bureau, No. 2011B031800375; the Scientific Research Project of Guangzhou Health Bureau, No. 201102A213061; the Initial Project for Ph.D. of Guangzhou Women and Children’s Medical Center, No. 201011
CLC Number:
Wu Jie-ying, Lu Yan, Chen Jin-song, Zhu Lu, Gan Wen-ting. Human umbilical cord blood plasma can replace fetal bovine serum for primary culture, proliferation and cryopreservation of umbilical cord mesenchymal stem cells[J]. Chinese Journal of Tissue Engineering Research, 2014, 18(37): 5947-5954.
2.1 两种培养体系下的脐带来源间充质干细胞的形态及增殖 原代培养第5天大部分细胞贴壁,细胞呈梭形或角形,可见数个细胞集落形成。第2-3代的两组脐带来源间充质干细胞均呈现典型的梭形漩涡状生长,形态、大小没有明显差别;但第1组细胞(胎牛血清培养)传至第8代出现体积增大、分泌颗粒增多等衰老现象,而第2组细胞(脐血血浆培养)传至第15代,细胞形态没有明显改变,见图1。 两组细胞的累积群体倍增数(CPD)均呈上升趋势,第2组细胞(脐血血浆培养)第3-5代的累积群体倍增数均高于第1组细胞(胎牛血清培养),差异有显著性意义(P < 0.05),见图2;细胞传代时间反映细胞增殖能力,细胞所需要的传代时间(GT)越长,提示细胞活力下降,增殖能力降低,第2组细胞第1-5代的传代时间均低于第1组细胞,差异有显著性意义(P < 0.05),见图3。"
2.2 脐带来源间充质干细胞冻存复苏后观察 分别取两组第3代脐带间充质干细胞,置于含胎牛血清或脐血血浆的冻存液冷冻保存至少6个月后复苏。7-AAD标记检测的复苏后细胞活率分别为93.7%(胎牛血清冻存)及95.2%(脐血血浆冻存),24 h细胞贴壁率分别为78%(胎牛血清冻存)及89%(脐血血浆冻存);复苏后两组细胞的生长状态良好,见图4。体外继续培养至第3代,两组细胞的增殖情况与各自冻存前的实验结果没有明显差异,但在两组细胞之间进行比较,第2组细胞(脐血血浆培养)第3代累积群体倍增数高于第1组细胞(胎牛血清培养),差异有显著性意义(P < 0.05),见图5;第2组细胞第1-3代的传代时间均低于第1组细胞,差异有显著性意义(P < 0.05),见图6。"
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