SnoN facilitates ALK1-Smad1/5 signaling during embryonic angiogenesis.

SnoN facilitates ALK1-Smad1/5 signaling during embryonic angiogenesis.
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DOI:
10.1083/jcb.201208113
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发表时间:
2013-09-16
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Luo K
Luo K
中科院分区:
其他
文献类型:
--
作者:
Zhu Q;Kim YH;Wang D;Oh SP;Luo K

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SnoN直接结合质膜上的ALK1,增强Smad1/5的激活,是正常血管生成所必需的。在内皮细胞中,转化生长因子β (TGF-β)家族的两种I型受体ALK1和ALK5协同调节胚胎血管生成,以响应BMP9/10和TGF-β。而TGF-β结合并激活ALK5,导致Smad2/3磷酸化,抑制内皮细胞的增殖和迁移,BMP9/10和TGF-β也结合ALK1,导致Smad1/5活化。SnoN通过结合和抑制Smad2/3,是ALK5信号的负调控因子。在这里,我们发现了SnoN在增强内皮细胞Smad1/5激活以促进血管生成中的积极作用。配体结合后,SnoN直接与质膜上的ALK1结合,促进了ALK1与Smad1/5的相互作用,增强了Smad1/5的磷酸化。SnoN-Smad相互作用的破坏破坏了Smad1/5的激活,上调了Smad2/3的活性。这导致血管生成缺陷和动静脉畸形,导致E12.5的胚胎死亡。因此,SnoN对TGF-β/ bmp9依赖的生物过程至关重要,因为它能够正向和负向调节smad依赖途径的活性。
SnoN directly binds ALK1 on the plasma membrane, enhancing Smad1/5 activation, and is required for normal angiogenesis. In endothelial cells, two type I receptors of the transforming growth factor β (TGF-β) family, ALK1 and ALK5, coordinate to regulate embryonic angiogenesis in response to BMP9/10 and TGF-β. Whereas TGF-β binds to and activates ALK5, leading to Smad2/3 phosphorylation and inhibition of endothelial cell proliferation and migration, BMP9/10 and TGF-β also bind to ALK1, resulting in the activation of Smad1/5. SnoN is a negative regulator of ALK5 signaling through the binding and repression of Smad2/3. Here we uncover a positive role of SnoN in enhancing Smad1/5 activation in endothelial cells to promote angiogenesis. Upon ligand binding, SnoN directly bound to ALK1 on the plasma membrane and facilitated the interaction between ALK1 and Smad1/5, enhancing Smad1/5 phosphorylation. Disruption of this SnoN–Smad interaction impaired Smad1/5 activation and up-regulated Smad2/3 activity. This resulted in defective angiogenesis and arteriovenous malformations, leading to embryonic lethality at E12.5. Thus, SnoN is essential for TGF-β/BMP9-dependent biological processes by its ability to both positively and negatively modulate the activities of Smad-dependent pathways.
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