TGF-β Signaling Is Necessary and Sufficient for Pharyngeal Arch Artery Angioblast Formation.

TGF-β Signaling Is Necessary and Sufficient for Pharyngeal Arch Artery Angioblast Formation.
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TGF-β信号传导是必需的,足以足以咽弓动脉血管细胞形成。

DOI:
10.1016/j.celrep.2017.07.002
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发表时间:
2017-07-25
期刊:
影响因子:
8.8
通讯作者:
Burns CE
Burns CE
中科院分区:
生物学1区
文献类型:
--
作者:
Abrial M;Paffett-Lugassy N;Jeffrey S;Jordan D;O'Loughlin E;Frederick CJ 3rd;Burns CG;Burns CE

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咽弓动脉(PAA)是胚胎期的短暂血管,成熟后形成主动脉弓及其分支的关键节段。尽管PAA发育缺陷会导致危及生命的先天性心血管缺陷,但其组织PAA形态发生的分子机制仍不清楚。通过在斑马鱼中的小分子筛选,我们确定TGF-β信号传导是PAA发育不可或缺的。具体而言,TGF-β I型受体ALK 5的化学抑制损害PAA发育,因为nkx2.5+ PAA祖细胞不能分化成tie 1+成血管细胞。与这一观察结果一致,我们记录了PAA祖细胞内ALK 5介导的Smad 3磷酸化的爆发,这预示着成血管细胞的出现。值得注意的是,过早诱导TGF-β受体活性会刺激早熟的成血管细胞分化,从而证明该途径足以启动PAA祖细胞向成血管细胞的转变。更广泛地说,这些数据揭示了TGF-β作为一种罕见的信号传导途径,对于成血管细胞谱系定型是必要和充分的。咽弓动脉(PAA)的胚胎发育不当会导致先天性缺陷,其特征在于主动脉及其分支的不连续性。Abrial等人鉴定TGF-β信号传导对于诱导斑马鱼中nkx2.5+ PAA祖细胞的成血管细胞分化是必要且充分的。值得注意的是,TGF-β信号传导的过早激活导致早熟的成血管细胞分化。
The pharyngeal arch arteries (PAAs) are transient embryonic blood vessels that mature into critical segments of the aortic arch and its branches. Although defects in PAA development cause life-threating congenital cardiovascular defects, the molecular mechanisms that orchestrate PAA morphogenesis remain unclear. Through small-molecule screening in zebrafish, we identified TGF-β signaling as indispensable for PAA development. Specifically, chemical inhibition of the TGF-β type I receptor ALK5 impairs PAA development because nkx2.5+ PAA progenitor cells fail to differentiate into tie1+ angioblasts. Consistent with this observation, we documented a burst of ALK5-mediated Smad3 phosphorylation within PAA progenitors that foreshadows angioblast emergence. Remarkably, premature induction of TGF-β receptor activity stimulates precocious angioblast differentiation, thereby demonstrating the sufficiency of this pathway for initiating the PAA progenitor to angioblast transition. More broadly, these data uncover TGF-β as a rare signaling pathway that is necessary and sufficient for angioblast lineage commitment. Improper embryonic development of the pharyngeal arch arteries (PAA) causes congenital defects characterized by discontinuity of the aorta and its branches. Abrial et al. identify TGF-β signaling as necessary and sufficient for inducing angioblast differentiation of nkx2.5+ PAA progenitors in zebrafish. Remarkably, premature activation of TGF-β signaling results in precocious angioblast differentiation.
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