中国组织工程研究 ›› 2014, Vol. 18 ›› Issue (6): 880-887.doi: 10.3969/j.issn.2095-4344.2014.06.010

• 胚胎干细胞 embryonic stem cells • 上一篇    下一篇

持续Wnt信号通路激活促进胚胎干细胞源造血干细胞的增殖

林 芳1,2,金静君2,张 韬2,纪斌峰1,陈 泳2,3   

  1. 1福州大学生物科学与工程学院,福建省福州市 350108;2福建省医学科学研究院、福建省医学测试重点实验室,福建省福州市 350001;3福建师范大学生命科学学院,福建省福州市 350108
  • 修回日期:2013-12-10 出版日期:2014-02-05 发布日期:2014-02-05
  • 通讯作者: 金静君,研究员,硕士生导师,福建省医学科学研究院,福建省福州市 350001
  • 作者简介:林芳,女,1987年生,福建省莆田市人,汉族,2011年福州大学毕业,主要从事胚胎干细胞诱导分化研究。
  • 基金资助:

    福建省自然科学基金(2012J01325);福建省医学创新课题(2012-cx-13);福建省省属公益类科研院所基本科研专项(2010R1034-1)

Proliferation of hematopoietic stem cells differentiated from embryonic stem cells via sustained Wnt pathway activation

Lin Fang1, 2, Jin Jing-jun2, Zhang Tao2, Ji Bin-feng1, Chen Yong2, 3   

  1. 1School of Bioscience and Engineering, Fuzhou University, Fuzhou 350108, Fujian Province, China; 2Fujian Academy of Medical Sciences, Fuzhou 350001, Fujian Province, China; 3School of Life Science, Fujian Normal University, Fuzhou 350108, Fujian Province, China
  • Revised:2013-12-10 Online:2014-02-05 Published:2014-02-05
  • Contact: Jin Jing-jun, Investigator, Master’s supervisor, Fujian Academy of Medical Sciences, Fuzhou 350001, Fujian Province, China
  • About author:Lin Fang, School of Bioscience and Engineering, Fuzhou University, Fuzhou 350108, Fujian Province, China; Fujian Academy of Medical Sciences, Fuzhou 350001, Fujian Province, China
  • Supported by:

    the Natural Science Foundation of Fujian Province, No. 2012J01325; the Medical Innovative Subject of Fujian Province, No. 2012-cx-13; Fundamental Scientific Research Activities at Non-Profit Research Institutions of Fujian Province, No. 2010R1034-1

摘要:

背景:如何提高胚胎干细胞诱导效率、促进胚胎干细胞源造血干细胞体外增殖成为目前急需解决的课题。

目的:以外源性Wnt3a作为诱导剂,激活培养中的小鼠胚胎干细胞Wnt/β-catenin信号通路,观察该通路的激活是否促进胚胎干细胞向造血祖细胞的定向分化。
方法:用外源性wnt3a(100 µg/L)持续作用ES-E14TG2a小鼠胚胎干细胞21 d,通过细胞免疫荧光及蛋白免疫印迹检测细胞内β-catenin蛋白含量,QRT-PCR检测Wnt下游靶标基因的表达量来确定经典Wnt/β-catenin信号通路是否被激活,然后采用单层贴壁培养法诱导其向造血干细胞分化,流式细胞仪检测造血发育相关表面标志CD34+/Sca-1+,同时以QRT-PCR法检测造血相关基因的表达情况。

结果与结论:ES-E14TG2a小鼠胚胎干细胞经wnt3a(100 µg/L)连续培养21 d后发现β-catenin蛋白在细胞内积累;Wnt信号通路的下游靶标基因Pitx2、Frizzled、Sox17、Oct4的表达量均出现不同程度的增加,可见经典Wnt/β-catenin信号通路有被激活;单层贴壁培养法诱导其向造血干细胞分化的过程中检测到CD34+/Sca-1+细胞含量在14 d时占总细胞量高达20.2%,而对照组的仅占11.9%。造血相关基因骨形态发生蛋白4、FLK2及CD34的表达量均增加,而Smad5的表达则明显受到抑制。说明Wnt3a持续作用可激活Wnt/β-catenin信号通路,并促进ES-E14TG2a小鼠胚胎干细胞向造血干细胞的定向分化。


中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程


全文链接:

关键词: 干细胞, 胚胎干细胞, 造血干细胞, Wnt3a, Wnt/β-catenin信号通路, 福建省自然科学基金

Abstract:

BACKGROUND:A variety of embryonic stem cells induction and differentiation systems have been established so far, while the research that promotes embryonic stem cells to differentiate into hematopoietic stem cells is still at an initial stage, and the induction efficiency needs to be improved.

OBJECTIVE: To active the Wnt/β-catenin signal pathway in mouse embryonic stem cells with exogenous win3a as an inducer, and then to observe whether the activation of this pathway will promote the directional differentiation of embryonic stem cells into hematopoietic progenitor cells.
METHODS:The ES-E14TG2a mouse stem cells were cultured with the exogenous wnt3a (100 µg/L) for 21 days, the content of β-catenin was tested by cell immunofluorescence and western blot, and expression of Wnt downstream target gene was detected by quantitative reverse transcription PCR to determine the activation of Wnt/β-catenin signal pathway. Single-layer adherent culture method was used to induce the directional differentiate of above-mentioned cells into hematopoietic stem cells, and detection of hematopoietic development associated surface marker CD34+/Sca-1+ was achieved by flow cytometry;
meanwhile, the expression of hematopoietic associated gene was measured by quantitative reverse transcription PCR.
RESULTS AND CONCLUSION: We found that β-catenin accumulated in ES-E14TG2a mouse stem cells after cultured with wnt3a (100 µg/L) for 21 days; the expressions of Wnt downstream target genes such as Pitx2, Frizzled, Sox17 and Oct4 showed the different degrees in increase, meaning the activation of Wnt/β-catenin signal pathway. Furthermore, during the time that we used single-layer adherent culture method to induce hematopoietic stem cells, the CD34+/Sca-1+ cells accounted for 20.2% of total cells at day 14, and control cells only accounted for 11.9%. Again, expression quantity of hematopoietic associated gene BMP4, FLK2 and CD34 increased while Smad5 was suppressed significantly. Our data suggest that sustaining action by wnt3a will active Wnt/β-catenin signal pathway, and also promote the directional differentiation of ES-E14TG2a mouse stem cells into hematopoietic progenitor cells.

中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程


全文链接:

Key words: stem cells, embryonic stem cells, hematopoietic stem cells, cell differentiation, cell proliferation

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