Efficient derivation of functional floor plate tissue from human embryonic stem cells.

Efficient derivation of functional floor plate tissue from human embryonic stem cells.
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DOI:
10.1016/j.stem.2010.03.001
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发表时间:
2010-04-02
期刊:
影响因子:
23.9
通讯作者:
Studer L
Studer L
中科院分区:
医学1区
文献类型:
--
作者:
Fasano CA;Chambers SM;Lee G;Tomishima MJ;Studer L

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基板(FP)是神经发育过程中的一个关键信号中心,位于胚胎的腹侧中线。由于组织难以获取,人们对人类基板的发育知之甚少。在此我们报道了人胚胎干细胞(hESC -)衍生的基板组织的高效诱导,该组织能够分泌轴突导向因子 -1(Netrin -1)和音猬因子(SHH),并能对原代组织和人胚胎干细胞衍生组织进行模式化。人胚胎干细胞中的基板诱导依赖于早期的音猬因子暴露,并且是以牺牲前神经外胚层(AN)为代价的。整体基因表达和功能研究确定了音猬因子介导的对 Dickkopf -1(DKK -1)的抑制是基板相对于前神经外胚层特化的关键因素。人胚胎干细胞衍生的基板组织显示出具有前SIX6阳性特征,但对尾侧化因子有反应,这些因子会抑制SIX6表达,并诱导区域特异性音猬因子增强子使用的转变。这些数据确定了驱动人类基板相对于前神经外胚层特化的早期信号,并确定了人胚胎干细胞衍生基板的区域特性。
The floor plate (FP) is a critical signaling center during neural development located along the ventral midline of the embryo. Little is known about human FP development due the lack of tissue accessibility. Here we report the efficient derivation of human embryonic stem cells (hESC−) derived FP tissue capable of secreting Netrin-1 and SHH and patterning primary and hESC derived tissues. FP induction in hESCs is dependent on early SHH exposure and occurs at the expense of anterior neurectoderm (AN). Global gene expression and functional studies identify SHH-mediated inhibition of DKK-1 as key factor in FP versus AN specification. hESC derived FP tissue is shown to be of anterior SIX6+ character but responsive to caudalizing factors suppressing SIX6 expression and inducing a shift in usage of region-specific SHH enhancers. These data define the early signals that drive human FP versus AN specification and determine regional identity in hESC derived FP.
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