The PI3K p110alpha isoform regulates endothelial adherens junctions via Pyk2 and Rac1.

The PI3K p110alpha isoform regulates endothelial adherens junctions via Pyk2 and Rac1.
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DOI:
10.1083/jcb.200907135
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发表时间:
2010-03-22
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Ridley AJ
Ridley AJ
中科院分区:
其他
文献类型:
--
作者:
Cain RJ;Vanhaesebroeck B;Ridley AJ

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只有PI3K的p110 α亚型介导VE-钙粘蛋白与Pyk 2(一种Rac GEF)和p85 PI3K调节亚基的结合,以降低TNF应答中的连接完整性。内皮细胞-细胞连接控制小分子的流出和血液与组织之间的白细胞跨内皮迁移(TEM)。磷脂酰肌醇3-激酶(PI3Ks)抑制剂增加内皮屏障功能,但不同的PI3K亚型的作用还没有得到解决。在这项研究中,我们确定了四种I类PI3K亚型(p110 α、-β、-γ和-δ)对内皮通透性和白细胞TEM的贡献。我们发现p110 α的缺失而不是其他p110亚型的缺失降低了TNF诱导的内皮通透性、粘附连接蛋白血管内皮钙粘蛋白(VE-钙粘蛋白)的Tyr磷酸化和白细胞TEM。p110 α选择性介导Tyr激酶Pyk2和GTdR ac 1的活化以调节屏障功能。此外,p110 α介导VE-钙粘蛋白与Pyk 2、Rac鸟嘌呤核苷酸交换因子Tiam-1和PI3K的p85调节亚基的结合。我们认为p110 α通过诱导VE-钙粘蛋白相关蛋白复合物的形成来调节内皮屏障功能,该复合物协调粘附连接与肌动蛋白细胞骨架的变化。
Only the p110α isoform of PI3K mediates the association of VE-cadherin with Pyk2, a Rac GEF and the p85 PI3K regulatory subunit, to reduce junctional integrity in response to TNF. Endothelial cell–cell junctions control efflux of small molecules and leukocyte transendothelial migration (TEM) between blood and tissues. Inhibitors of phosphoinositide 3-kinases (PI3Ks) increase endothelial barrier function, but the roles of different PI3K isoforms have not been addressed. In this study, we determine the contribution of each of the four class I PI3K isoforms (p110α, -β, -γ, and -δ) to endothelial permeability and leukocyte TEM. We find that depletion of p110α but not other p110 isoforms decreases TNF-induced endothelial permeability, Tyr phosphorylation of the adherens junction protein vascular endothelial cadherin (VE-cadherin), and leukocyte TEM. p110α selectively mediates activation of the Tyr kinase Pyk2 and GTPase Rac1 to regulate barrier function. Additionally, p110α mediates the association of VE-cadherin with Pyk2, the Rac guanine nucleotide exchange factor Tiam-1 and the p85 regulatory subunit of PI3K. We propose that p110α regulates endothelial barrier function by inducing the formation of a VE-cadherin–associated protein complex that coordinates changes to adherens junctions with the actin cytoskeleton.
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