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Reggie-1/Flotillin-2 regulates integrin trafficking and focal adhesion turnover via Rab11a

机译:Reggie-1 / Flotillin-2通过Rab11a调节整联蛋白的运输和粘着斑的转运

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摘要

Reggies/flotillins are implicated in trafficking of membrane proteins to their target sites and in the regulation of the Rab11a-dependent targeted recycling of E-cadherin to adherens junctions (AJs). Here we demonstrate a function of reggies in focal adhesion (FA) formation and alpha 5- and beta 1-integrin recycling to FAs. Downregulation of reggie-1 in HeLa and A431 cells by siRNA and shRNA increased the number of FAs, impaired their distribution and modified FA turnover. This was coupled to enhanced focal adhesion kinase (FAK) and Rac1 signaling and gain in plasma membrane motility. Wild type and constitutively-active (CA) Rab11a rescued the phenotype (normal number of FAs) whereas dominant-negative (DN) Rab11a mimicked the loss-of-reggie phenotype in control cells. That reggie-1 affects integrin trafficking emerged from the faster loss of internalized antibody-labeled beta 1-integrin in reggie-deficient cells. Moreover, live imaging using TIRF microscopy revealed vesicles containing reggie-1 and alpha 5- or beta 1-integrin, trafficking close to the substrate near membrane and making kiss-and-run contacts with FAs. Thus, reggie-1 in interaction with Rab11a controls Rac1 and FAK activation and coordinates the targeted recycling of alpha 5- and beta 1-integrins to FAs to regulate FA formation and membrane dynamics. (C) 2015 Elsevier GmbH. All rights reserved.
机译:Reggies / flotillins参与膜蛋白向其靶位的运输,并调控E-cadherin依赖Rab11a的靶向回收至粘附连接(AJs)。在这里,我们展示了胶粘剂粘连(FA)形成和α5-和β1-整合素回收到FA的功能。 siRNA和shRNA下调HeLa和A431细胞中reggie-1的表达会增加FA的数量,损害其分布并改变FA的营业额。这与增强的粘着斑粘附激酶(FAK)和Rac1信号传导以及质膜运动性增加相关。野生型和组成性活性(CA)Rab11a挽救了该表型(正常FA数),而显性负性(DN)Rab11a模仿了对照细胞中的失养表型。 reggie-1影响整联蛋白的运输是由于缺乏reggie的细胞中内在化的抗体标记的β1-integrin的快速丧失而产生的。此外,使用TIRF显微镜进行的实时成像显示,含有reggie-1和α5-或β1-整联蛋白的囊泡,在靠近膜的基质附近运输,并与FAs亲密接触。因此,与Rab11a相互作用的reggie-1控制Rac1和FAK活化,并协调α5-和β1-整联蛋白向FAs的靶向回收,从而调节FA的形成和膜动力学。 (C)2015 Elsevier GmbH。版权所有。

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