ErbB2 directly activates the exchange factor Dock7 to promote Schwann cell migration.

ErbB2 directly activates the exchange factor Dock7 to promote Schwann cell migration.
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ErbB2直接激活交换因子Dock7促进雪旺细胞迁移。

DOI:
10.1083/jcb.200709033
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发表时间:
2008-04-21
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Tanoue A
Tanoue A
中科院分区:
其他
文献类型:
--
作者:
Yamauchi J;Miyamoto Y;Chan JR;Tanoue A

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周围神经系统髓鞘形成之前的细胞事件需要雪旺细胞中快速和动态的形态学变化。这些事件被认为主要由轴突信号控制。但是轴突上的信号是如何协调组织和转导以促进增殖、迁移、放射状分选和髓鞘形成的还不清楚。我们描述了轴突信号neuregulin-1(NRG 1)通过激活非典型Dock 180相关的鸟嘌呤核苷酸交换因子(GEF)Dock 7和随后激活Rho鸟嘌呤三磷酸酶(GTP酶)Rac 1和Cdc 42以及下游c-Jun N-末端激酶来控制Schwann细胞迁移。我们表明,NRG 1受体ErbB 2直接结合并激活Dock 7通过磷酸化酪氨酸-1118。Dock 7敲除或在Schwann细胞中表达携带Tyr-1118-to-Phe突变的Dock 7,减弱了NRG 1的作用。因此,Dock 7作为ErbB 2的细胞内底物发挥作用,以促进许旺细胞迁移。这提供了一种未预料到的机制,通过该机制,配体依赖性酪氨酸磷酸化可以触发Dock 180家族的Rho GTP酶-GEF的激活。
The cellular events that precede myelination in the peripheral nervous system require rapid and dynamic morphological changes in the Schwann cell. These events are thought to be mainly controlled by axonal signals. But how signals on the axons are coordinately organized and transduced to promote proliferation, migration, radial sorting, and myelination is unknown. We describe that the axonal signal neuregulin-1 (NRG1) controls Schwann cell migration via activation of the atypical Dock180-related guanine nucleotide exchange factor (GEF) Dock7 and subsequent activation of the Rho guanine triphosphatases (GTPases) Rac1 and Cdc42 and the downstream c-Jun N-terminal kinase. We show that the NRG1 receptor ErbB2 directly binds and activates Dock7 by phosphorylating Tyr-1118. Dock7 knockdown, or expression of Dock7 harboring the Tyr-1118–to–Phe mutation in Schwann cells, attenuates the effects of NRG1. Thus, Dock7 functions as an intracellular substrate for ErbB2 to promote Schwann cell migration. This provides an unanticipated mechanism through which ligand-dependent tyrosine phosphorylation can trigger the activation of Rho GTPase-GEFs of the Dock180 family.
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