基础医学与临床 ›› 2016, Vol. 36 ›› Issue (4): 486-491.

• 研究论文 • 上一篇    下一篇

静电纺丝聚己内酯纳米纤维支架支持小鼠诱导多能干细胞表达心肌细胞标志物

陈焱1,2,何顺舟3,李晓莉1,曾迪1,丁璐1,谢江徽3,季滨龙2,郑强荪1   

  1. 1. 第四军医大学唐都医院
    2. 解放军第401医院
    3. 解放军401医院
  • 收稿日期:2015-09-07 修回日期:2015-11-12 出版日期:2016-04-05 发布日期:2016-03-29
  • 通讯作者: 郑强荪 E-mail:zhengqiangsun@yeah.net
  • 基金资助:
    ips细胞在组织工程心肌构建中的应用基础研究;BMP10载药纳米基质支架:ips源性心肌细胞的促熟新策略及机制研究

Electrospun Poly-(ε-caprolactone) Nanofibrous Scaffolds Support Cardiomyocyte Markers Expression of Murine Induced Pluripotent Stem Cell

  • Received:2015-09-07 Revised:2015-11-12 Online:2016-04-05 Published:2016-03-29

摘要: 目的 利用多能干细胞与仿生材料支架构建人工心肌,探讨仿生材料支架本身对多能干细胞心肌特异性分化的直接作用,为构建组织工程心肌提供理论支持。方法 采用静电纺丝聚己内酯纳米纤维仿生支架,接种小鼠iPSCs(miPSCs)细胞培养分化15d,免疫荧光染色与Western blot法检测多能干细胞与心肌细胞特异性标志物。结果miPSCs特异性表达多能干性标志物Oct4和Nanog,而且能够在聚己内酯纳米纤维支架上集落样增殖、分化;培养15d后,miPSCs在支架上分化出心肌特异性标志物cTnT和MLC2a双重免疫荧光染色阳性的细胞;心肌细胞特异性结构蛋白cTnT、α-MHC和MLC2的表达水平,支架组全面高于对照组。结论 聚己内酯纳米纤维仿生支架支持miPSCs生长与心肌细胞特异性分化。

关键词: 诱导多能干细胞, 聚己内酯, 纳米纤维支架, 心肌细胞

Abstract: Objective Stem cell- and biomimetic scaffold-based myocardial tissue engineering is becoming one of the most promising methods for constructing artificial myocardium in vitro, however the possible influence of biomimetic scaffolds on cardiomyocyte (CM) differentiation of induced pluripotent stem cells (iPSCs) remains to be elaborated. Methods The Oct4-GFP+ mouse iPSCs (miPSCs) were seeded directly on the poly-(ε-caprolactone) (PCL) nanofibrous biomimetic scaffolds, which were fabricated by an electrospun technology, and differentiated for 15 days. The development of CMs was verified both by immunofluorescence staining and by Western blot detection. Results The results showed that miPSCs, expressing Oct4 and Nanog before differentiation, proliferated on the PCL nanofibrous scaffold and grew in colonies during spontaneous differentiation period. Immunofluorescence staining revealed that some of the miPSCs-derived cells were co-labeled with cardiomyocyte specific proteins, such as cardiac Troponin T (cTnT) and myosin light chain 2a (MLC2a). Moreover, Western blot demonstrated that cells derived from miPSCs after differentiation for 15 days expressed higher levels of cTnT, MLC2 and α-myosin heavy chain (α-MHC) than controls. Conclusion Theses results suggest that the PCL nanofibrous scaffold could support proliferation and cardiomyocyte differentiation of the Oct4-GFP+ miPSC.

Key words: induced pluripotent stem cell, poly-(ε-caprolactone), nanofibrous scaffold, cardiomyocyte

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