PPFIA1 drives active α5β1 integrin recycling and controls fibronectin fibrillogenesis and vascular morphogenesis.

PPFIA1 drives active α5β1 integrin recycling and controls fibronectin fibrillogenesis and vascular morphogenesis.
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DOI:
10.1038/ncomms13546
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发表时间:
2016-11-23
影响因子:
16.6
通讯作者:
Valdembri, Donatella
Valdembri, Donatella
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Mana, Giulia;Clapero, Fabiana;Panieri, Emiliano;Panero, Valentina;Boettcher, Ralph T.;Tseng, Hui-Yuan;Saltarin, Federico;Astanina, Elena;Wolanska, Katarzyna I.;Morgan, Mark R.;Humphries, Martin J.;Santoro, Massimo M.;Serini, Guido;Valdembri, Donatella

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细胞纤维连接蛋白(FN)的基底外侧聚合成网状结构驱动内皮细胞(EC)极性和血管重塑。然而,协调α5β1整合素介导的细胞外FN内吞和新合成FN的胞吐的机制仍然难以捉摸。在这里,我们表明,在Rab 21引起的内化,FN结合/活性α5β1再循环到EC表面。我们确定了一条途径,包括高尔基体后载体形成的调节因子PI 4KB和AP-1A、小GTdR Rab 11B、表面酪氨酸磷酸酶受体PTPRF及其接头PPFIA 1,我们提出该途径作为一个漏斗,将FN分泌和活性α5β1整合素从高尔基体网络(TGN)再循环到EC表面,从而允许FN纤维形成。在这个框架中,PPFIA 1与活性α5β1整联蛋白相互作用,并定位于靠近高尔基体后载体靶向的EC粘附。我们表明,PPFIA 1是所需的FN聚合依赖的血管形态发生,在体外和斑马鱼胚胎发育。 在血管发育过程中,纤维连接蛋白(FN)在内皮细胞的基底外侧聚合。在这里,Mana等人提出了一种模型,其中PPFIA 1驱动FN受体α 5 β1整联蛋白再循环到细胞表面,并使新合成的FN能够极性分泌和原纤维形成。
Basolateral polymerization of cellular fibronectin (FN) into a meshwork drives endothelial cell (EC) polarity and vascular remodelling. However, mechanisms coordinating α5β1 integrin-mediated extracellular FN endocytosis and exocytosis of newly synthesized FN remain elusive. Here we show that, on Rab21-elicited internalization, FN-bound/active α5β1 is recycled to the EC surface. We identify a pathway, comprising the regulators of post-Golgi carrier formation PI4KB and AP-1A, the small GTPase Rab11B, the surface tyrosine phosphatase receptor PTPRF and its adaptor PPFIA1, which we propose acts as a funnel combining FN secretion and recycling of active α5β1 integrin from the trans-Golgi network (TGN) to the EC surface, thus allowing FN fibrillogenesis. In this framework, PPFIA1 interacts with active α5β1 integrin and localizes close to EC adhesions where post-Golgi carriers are targeted. We show that PPFIA1 is required for FN polymerization-dependent vascular morphogenesis, both in vitro and in the developing zebrafish embryo. During vascular development, fibronectin (FN) is polymerized at the basolateral side of endothelial cells. Here Mana et al. propose a model where PPFIA1 drives recycling of the FN receptor, a5β1 integrin, to the cell surface and enables polar secretion and fibrillogenesis of newly synthesized FN.
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