山东大学学报 (医学版) ›› 2019, Vol. 57 ›› Issue (11): 1-8.doi: 10.6040/j.issn.1671-7554.0.2019.813
• 基础医学 •
黄金献1,李栋2,李聪1,时庆2,鞠秀丽1
HUANG Jinxian1, LI Dong2, LI Cong1, SHI Qing2, JU Xiuli1
摘要: 目的 探讨三维培养对脐带间充质干细胞(UC-MSCs)全基因组DNA甲基化状态的影响。 方法 通过贴壁培养法获得UC-MSCs,采用流式细胞术鉴定其细胞表型。采用聚氟乙烯巢状片进行三维培养,吖啶橙荧光观察UC-MSCs在支架上生长情况。采用甲基化DNA免疫共沉淀测序(MeDIP-Seq)技术检测细胞全基因组DNA甲基化情况。 结果 成功分离培养UC-MSCs并证明其表型符合国际标准,细胞黏附在聚氟乙烯巢状片三维培养体系中且生长良好。MeDIP-Seq结果显示,三维培养后UC-MSCs全基因组DNA甲基化水平较二维培养整体上调。基因本体(GO)分析显示,与二维培养的细胞相比,三维培养的UC-MSCs中上调的差异甲基化基因多参与蛋白质的代谢、膜相关细胞器的组成、酶活性调节等;而下调的差异甲基化基因主要参与囊泡运输和cGMP代谢过程。通路分析显示,三维培养的UC-MSCs中上调的差异甲基化基因多参与RNA转运、神经配体受体活性、Notch信号通路等;下调的差异甲基化基因多参与磷酸肌醇代谢通路和囊泡分泌相关的通路。 结论 三维培养改变了UC-MSCs的DNA甲基化谱,所涉及的甲基化上调基因多参与细胞的迁移和增殖功能。三维培养降低了UC-MSCs的免疫调控和分泌囊泡相关基因的甲基化水平。
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