Endophilin, Lamellipodin, and Mena cooperate to regulate F-actin-dependent EGF-receptor endocytosis.

Endophilin, Lamellipodin, and Mena cooperate to regulate F-actin-dependent EGF-receptor endocytosis.
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DOI:
10.1038/emboj.2013.212
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发表时间:
2013-10-16
期刊:
影响因子:
11.4
通讯作者:
Krause, Matthias
Krause, Matthias
中科院分区:
生物学1区
文献类型:
--
作者:
Vehlow, Anne;Soong, Daniel;Vizcay-Barrena, Gema;Bodo, Cristian;Law, Ah-Lai;Perera, Upamali;Krause, Matthias

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表皮生长因子受体(EGFR)在发育和疾病(包括癌症)中起着重要作用。已知板状伪足蛋白(Lpd)通过Ena/VASP蛋白调节肌动蛋白丝的伸长来控制板状伪足突出。然而,尚不清楚该机制是否支持EGFR的内吞作用。在这里,我们已经确定了一个新的作用LPD和Mena网格蛋白介导的内吞作用(CME)的EGFR。我们已经发现内源性Lpd与EGFR和Lpd复合,并且Mena敲低损害EGFR内吞作用。相反,过表达Lpd以F-肌动蛋白依赖性方式显著增加EGFR摄取,表明F-肌动蛋白聚合限制EGFR摄取。此外,我们发现,LPD直接相互作用与endophilin,BAR域含有蛋白质涉及囊泡分裂。我们确定了内嗜蛋白在EGFR内吞作用中的作用,这是由LPD介导的。因此,Lpd在囊泡破裂前定位于网格蛋白包被的小凹(CCPs),并调节囊泡的破裂。我们的研究结果表明,一种新的机制,其中LPD介导的EGFR内吞作用,通过Mena下游的内啡肽。
The epidermal growth factor receptor (EGFR) plays an essential role during development and diseases including cancer. Lamellipodin (Lpd) is known to control lamellipodia protrusion by regulating actin filament elongation via Ena/VASP proteins. However, it is unknown whether this mechanism supports endocytosis of the EGFR. Here, we have identified a novel role for Lpd and Mena in clathrin-mediated endocytosis (CME) of the EGFR. We have discovered that endogenous Lpd is in a complex with the EGFR and Lpd and Mena knockdown impairs EGFR endocytosis. Conversely, overexpressing Lpd substantially increases the EGFR uptake in an F-actin-dependent manner, suggesting that F-actin polymerization is limiting for EGFR uptake. Furthermore, we found that Lpd directly interacts with endophilin, a BAR domain containing protein implicated in vesicle fission. We identified a role for endophilin in EGFR endocytosis, which is mediated by Lpd. Consistently, Lpd localizes to clathrin-coated pits (CCPs) just before vesicle scission and regulates vesicle scission. Our findings suggest a novel mechanism in which Lpd mediates EGFR endocytosis via Mena downstream of endophilin.
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