Secreted proteoglycans directly mediate human embryonic stem cell-basic fibroblast growth factor 2 interactions critical for proliferation.

Secreted proteoglycans directly mediate human embryonic stem cell-basic fibroblast growth factor 2 interactions critical for proliferation.
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DOI:
10.1634/stemcells.2007-1056
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发表时间:
2008-12
期刊:
Stem cells (Dayton, Ohio)
影响因子:
--
通讯作者:
Thomson JA
Thomson JA
中科院分区:
其他
文献类型:
--
作者:
Levenstein ME;Berggren WT;Lee JE;Conard KR;Llanas RA;Wagner RJ;Smith LM;Thomson JA

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如果首先将培养基置于小鼠胚胎成纤维细胞(MEF)饲养细胞层上,则人胚胎干(ES)细胞可以维持在未分化状态。在这里,我们表明,人ES细胞增殖的协调MEF分泌硫酸乙酰肝素蛋白多糖(HSPG)在条件培养基(CM)。这些HSPG和其他类肝素可以稳定非条件培养基中的碱性成纤维细胞生长因子(FGF 2),其水平与CM中观察到的水平相当。它们还直接介导FGF2与人ES细胞表面的结合,并且它们从CM中去除会损害增殖。最后,我们已经开发了一种纯化方案,为MEF分泌的HSPG在CM。利用柱层析,免疫印迹和质谱为基础的蛋白质组学分析,我们已经确定了CM中的多个HSPG物种。结果表明,HSPG是基于CM的人ES细胞培养中的关键信号传导辅因子。
Human embryonic stem (ES) cells can be maintained in an undifferentiated state if the culture medium is first conditioned on a layer of mouse embryonic fibroblast (MEF) feeder cells. Here we show that human ES cell proliferation is coordinated by MEF-secreted heparan sulfate proteoglycans (HSPG) in conditioned medium (CM). These HSPG and other heparinoids can stabilize basic fibroblast growth factor (FGF2) in unconditioned medium at levels comparable to those observed in CM. They also directly mediate binding of FGF2 to the human ES cell surface, and their removal from CM impairs proliferation. Finally, we have developed a purification scheme for MEF-secreted HSPG in CM. Utilizing column chromatography, immunoblotting, and mass spectrometry-based proteomic analysis, we have identified multiple HSPG species in CM. The results demonstrate that HSPG are key signaling cofactors in CM-based human ES cell culture.
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