Hedgehog and Bmp polarize hematopoietic stem cell emergence in the zebrafish dorsal aorta.

Hedgehog and Bmp polarize hematopoietic stem cell emergence in the zebrafish dorsal aorta.
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DOI:
10.1016/j.devcel.2009.04.014
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发表时间:
2009-06
期刊:
影响因子:
11.8
通讯作者:
Patient, Roger
Patient, Roger
中科院分区:
生物学1区
文献类型:
--
作者:
Wilkinson, Robert N.;Pouget, Claire;Gering, Martin;Russell, Angela J.;Davies, Stephen G.;Kimelman, David;Patient, Roger

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造血干细胞 (HSC) 首先在胚胎背主动脉 (DA) 的底部检测到,在这里我们研究了在那里诱导 HSC 程序的信号。我们发现,虽然来自上层中线结构的持续 Hedgehog (Hh) 信号维持了 DA 顶部的动脉程序特征,但腹侧 Bmp4 信号诱导了 DA 地板中的血液干细胞程序。 Hh 和 Bmp 的 DA 模式是神经管中的镜像,Hh 偏向背侧细胞类型而不是腹侧细胞类型,而 Bmp 偏向腹侧细胞类型而不是背侧细胞类型。目前大多数数据都支持 HSC 源自动脉内皮的模型,我们的数据确定了驱动这种转换的信号。这些发现对于从胚胎干细胞产生造血干细胞非常重要,并为成体干细胞的发育建立了范例。
Haematopoietic stem cells (HSCs) are first detected in the floor of the embryonic dorsal aorta (DA) and here we investigate the signals that induce the HSC programme there. We show that while continued Hedgehog (Hh) signalling from the overlying midline structures maintains the arterial programme characteristic of the DA roof, a ventral Bmp4 signal induces the blood stem cell programme in the DA floor. This patterning of the DA by Hh and Bmp is the mirror image of that in the neural tube, with Hh favouring dorsal rather than ventral cell types, and Bmp favouring ventral rather than dorsal. With the majority of current data supporting a model whereby HSCs derive from arterial endothelium, our data identifies the signal driving this conversion. These findings are important for the production of HSCs from embryonic stem cells and establish a paradigm for the development of adult stem cells.
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