Chinese Journal of Tissue Engineering Research ›› 2014, Vol. 18 ›› Issue (10): 1539-1546.doi: 10.3969/j.issn.2095-4344.2014.10.010
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Li Bing-yao1, Wu Xiao-yun2, Wu Yan1
Online:
2014-03-05
Published:
2014-03-05
Contact:
Wu Yan, M.D., Professor, Master’s supervisor, Department of Histology and Embryology, Inner Mongolia Medical University, Hohhot 010059, Inner Mongolia Autonomous Region, China
About author:
Li Bing-yao, Studying for master’s degree, Attending physician, Department of Histology and Embryology, Inner Mongolia Medical University, Hohhot 010059, Inner Mongolia Autonomous Region, China
Supported by:
Stem Cell Technology Innovation Team Funded Projects in Inner Mongolia Autonomous Region, No. kjt0020947
CLC Number:
Li Bing-yao, Wu Xiao-yun, Wu Yan. Large-scale expansion of human umbilical cord mesenchymal stem cells in human platelet lysate as a substitute of fetal bovine serum[J]. Chinese Journal of Tissue Engineering Research, 2014, 18(10): 1539-1546.
2.1 细胞形态观察 经酶消化后将脐带源有核细胞分别接种于含有人血小板裂解液无血清培养基和胎牛血清培养基进行细胞培养,人血小板裂解液无血清培养组细胞于12 h内可见少量细胞贴壁。在倒置显微镜下可见贴壁细胞单个散在或成簇生长,贴壁后增长速度较快,细胞体积增大,长梭形,多边形,细胞集落明显增大、增多。培养1周后细胞达80%-90% 融合,传代后呈成为形态相对均一的梭形细胞,呈平行排列生长或旋涡状生长。与体积分数10%胎牛血清培养基接种的间充质干细胞的细胞形态相比,二者形态相似(图1)。 2.2 细胞直径比较 流式细胞仪通过对细胞的前向角散射信号比较2种培养基扩增脐带间充质干细胞的细胞直径,结果显示人血小板裂解液培养基扩增的脐带间充质干细胞的细胞直径小于胎牛血清培养基扩增的脐带间充质干细胞(n=5,t=3.821,P < 0.05,图1)。"
2.6 细胞分化能力检测结果 成骨诱导分化鉴定:人血小板裂解液无血清培养基扩增P5代脐带间充干细胞经成骨诱导3周后,茜素红染色结果结节呈橘红色,边界清晰,提示有矿化基质沉积,染色结果显示血小板裂解液无血清培养基扩增脐带间充干细胞的矿化结节(橘红色颗粒)数量高于胎牛血清培养基扩增的脐带间充质干细胞(图5A,B)。 实时定量PCR结果显示血小板裂解液无血清培养基扩增脐带间充干细胞的成骨分化特异性基因RUNX-2和碱性磷酸酶表达量均高于胎牛血清培养基扩增的脐带间充干细胞,差异有显著性意义(t =4.371,P < 0.05;t=3.358,P < 0.05,图5C)。 成脂诱导分化鉴定:人血小板裂解液无血清培养基扩增P5代脐带间充干细胞经成脂诱导定向诱导培养后1周,小部分细胞内已出现微小明亮的脂滴。随着诱导时间的延长,出现脂滴的细胞增多,细胞由梭形变成椭圆形或多角形。 培养3周后,油红O染色后镜下观察见大量的脂质沉积(图5D,E),提示细胞已分化成脂肪细胞,染色结果显示人血小板裂解液无血清培养基扩增脐带间充干细胞脂质沉积(红色颗粒)数量低于胎牛血清培养基扩增的脐带间充干细胞,实时定量PCR结果显示人血小板裂解液无血清培养基扩增脐带间充干细胞成脂分化特异性基因过氧化物酶体增殖物激活受体γ和脂蛋白脂肪酶表达量均低于胎牛血清培养基扩增的脐带间充干细胞,但两者之间比较差异无显著性意义(t=1.141,P > 0.05;t=1.256, P > 0.05,图5F)。"
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