Proinflammatory signaling regulates hematopoietic stem cell emergence.

Proinflammatory signaling regulates hematopoietic stem cell emergence.
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DOI:
10.1016/j.cell.2014.10.031
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发表时间:
2014-11-20
期刊:
影响因子:
64.5
通讯作者:
Traver D
Traver D
中科院分区:
生物学1区
文献类型:
--
作者:
Espín-Palazón R;Stachura DL;Campbell CA;García-Moreno D;Del Cid N;Kim AD;Candel S;Meseguer J;Mulero V;Traver D

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造血干细胞(hsc)是生物体一生中产生血液和免疫细胞的基础。在脊椎动物胚胎中,造血干细胞是在一个短暂的发育窗口期由包含背主动脉底的造血内皮的独特转分化而产生的。迄今为止,这一过程尚未在体外从多能前体中复制,部分原因是所需信号输入的完整补充仍有待确定。在这里,我们发现TNFR2通过TNFα激活Notch和NF-κB信号通路来建立HSC的命运,这表明炎症信号在HSC的产生中是必需的。我们确定原始中性粒细胞是TNFα的主要来源,在建立HSC程序中指定瞬时先天免疫细胞的作用。这些结果表明,在没有感染的情况下,促炎信号被发育中的胚胎利用来产生成人造血系统的直系前体。
Hematopoietic stem cells (HSCs) underlie the production of blood and immune cells for the lifetime of an organism. In vertebrate embryos, HSCs arise from the unique transdifferentiation of hemogenic endothelium comprising the floor of the dorsal aorta during a brief developmental window. To date, this process has not been replicated in vitro from pluripotent precursors, partly because the full complement of required signaling inputs remains to be determined. Here, we show that TNFR2 via TNFα activates the Notch and NF-κB signaling pathways to establish HSC fate, indicating a requirement for inflammatory signaling in HSC generation. We determine that primitive neutrophils are the major source of TNFα, assigning a role for transient innate immune cells in establishing the HSC program. These results demonstrate that proinflammatory signaling, in the absence of infection, is utilized by the developing embryo to generate the lineal precursors of the adult hematopoietic system.
DOI: 10.1002/bies.20647
发表时间: 2007-10-01
期刊: BIOESSAYS
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