改良法分离培养兔骨髓源性早晚期内皮祖细胞
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国家自然科学基金(81070221);;湖南省教育厅基金(08C747)资助


Early and Late Endothelial Progenitor Cells Derived from Rabbit Bone Marrow Isolated and Cultured by An Improved Method
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    目的探索简单有效分离培养兔骨髓源性内皮祖细胞的方法,并比较两种内皮祖细胞生物学性状。方法4周龄左右的新西兰兔,于每侧胫骨取骨髓2 mL,密度梯度离心后取单个核细胞接种于培养瓶,48 h后将悬浮的细胞收集再次贴壁,血管内皮生长因子诱导其向内皮祖细胞分化。免疫细胞化学鉴定其表面标志物、免疫荧光功能学测定,对比前后两种贴壁细胞生长状况。结果早期获取的单个核细胞,半小时后就开始贴壁,3天左右即可长出长梭形的细胞,胞体较大,有血岛样克隆形成,随后培养可形成管腔样结构,10天左右即可呈漩涡状融合整个培养瓶,但这种细胞传代能力差,为早期内皮祖细胞;第2次贴壁的晚期细胞于贴壁后呈椭圆形生长,贴壁后5~7天即可出现集落,片状生长,最后呈铺路石样融合,并可连续传至10代以上,为晚期内皮祖细胞。第2次贴壁的内皮祖细胞在分化过程中明显失去CD133+,而CD34+表达有所升高,大部分第1次贴壁内皮祖细胞可以吞噬乙酰化低密度脂蛋白和荆豆凝集素l,第2次贴壁内皮祖细胞功能学鉴定结果与第1次贴壁的结果类似。结论改良后的密度梯度离心法结合差速贴壁法能有效分离培养兔骨髓源性内皮祖细胞,第2次贴壁的内皮祖细胞生长能力更强。

    Abstract:

    Aim To establish an available and convenient method to isolate and culture the rabbit bone marrow-derived endothelial progenitor cells(EPC) and compare the characteristics of the two different EPC. Methods Obtained 2 mL bone marrow from each shinbone of about 4 weeks old New Zealand rabbit,mononuclear cells(MNC) were isolated by Ficoll density gradient centrifugation method and planted in the first culture flask,after incubated for 48 h,collecting the suspended cells into the second flask,supplemented with vascular endothelial growth factor(VEGF) in order to induce cells differentiation into EPC.To compare the growing characteristics of the former and later cells,immunocytochemistry was used to examine the expression of the surfaces markers and immunofluorescence for function detection. Results Earlier obtained mononuclear cells adhered after planted 30 minutes,about 3 days late,cells became long spindle-shaped,a little bigger,and formed blood island-like clone and vessels-like formation.To the 10 days,vortex cells can confluence the whole flask,but had less proliferation(early EPC).The second adherent cells,oval shape,and appeared colony-forming by the 5~7th day after adhered.At last,cells confluenced like slabstone,which can transfer for 10 generations consecutively(late EPC).The second adherent EPC have a deficiency of CD133+obviously during differentiation,but a higher expression of CD34+.Most first adherent EPC can uptake Dil-ac-LDL and Ulex Europaeus agglutinin-1(UEA-1),that is similar to the function identification of the second adherent EPC. Conclusion The improved Ficoll density gradient centrifugation integrated with differential attachment technique can efficiently isolate and culture rabbit bone marrow-derived EPC,and the late EPC have a stronger growing ability.

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南华大学心血管病研究所 动脉硬化学湖南省重点实验室, 湖南省衡阳市 .改良法分离培养兔骨髓源性早晚期内皮祖细胞[J].中国动脉硬化杂志,2011,19(10):865~869.

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  • 收稿日期:2011-04-02
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