Kindlin-2 recruits paxillin and Arp2/3 to promote membrane protrusions during initial cell spreading.

Kindlin-2 recruits paxillin and Arp2/3 to promote membrane protrusions during initial cell spreading.
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DOI:
10.1083/jcb.201701176
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发表时间:
2017-11-06
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Fässler R
Fässler R
中科院分区:
其他
文献类型:
--
作者:
Böttcher RT;Veelders M;Rombaut P;Faix J;Theodosiou M;Stradal TE;Rottner K;Zent R;Herzog F;Fässler R

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细胞铺展依赖于整合素介导的粘附和肌动蛋白结构的协调和动态调节。Böttcher等人表明,在粘附细胞的外周中,kindlin-2结合桩蛋白以激活Rac 1和Arp 2/3复合物,从而允许Rac 1介导的膜突起。细胞铺展需要肌动蛋白驱动的膜突起和整合素介导的粘附到细胞外基质的偶联。整合素激活的衔接蛋白kindlin-2通过直接结合和募集桩蛋白到新生的粘附中而在细胞粘附和膜突起中起核心作用。在这里,我们报告说,kindlin-2在最初的细胞扩散过程中具有双重作用:它结合桩蛋白通过pleckstrin同源性和F0域激活Rac 1,它直接与Arp 2/3复合物诱导Rac 1介导的膜突起。因此,废除kindlin-2与Arp 2/3的结合会损害板状伪足的形成和细胞铺展。我们的研究结果确定kindlin-2作为一个关键蛋白,通过激活整合素和诱导膜突起的激活Rac 1和供应Rac 1与Arp 2/3复合物,耦合细胞粘附。
Cell spreading relies on the coordinated and dynamic regulation of integrin-mediated adhesions and actin structures. Böttcher et al. show that in the periphery of adhering cells kindlin-2 binds paxillin to activate Rac1 and the Arp2/3 complex to allow for Rac1-mediated membrane protrusions. Cell spreading requires the coupling of actin-driven membrane protrusion and integrin-mediated adhesion to the extracellular matrix. The integrin-activating adaptor protein kindlin-2 plays a central role for cell adhesion and membrane protrusion by directly binding and recruiting paxillin to nascent adhesions. Here, we report that kindlin-2 has a dual role during initial cell spreading: it binds paxillin via the pleckstrin homology and F0 domains to activate Rac1, and it directly associates with the Arp2/3 complex to induce Rac1-mediated membrane protrusions. Consistently, abrogation of kindlin-2 binding to Arp2/3 impairs lamellipodia formation and cell spreading. Our findings identify kindlin-2 as a key protein that couples cell adhesion by activating integrins and the induction of membrane protrusions by activating Rac1 and supplying Rac1 with the Arp2/3 complex.
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