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:
影响因子:
--
通讯作者:
Tanoue A
中科院分区:
文献类型:
--
作者:
Yamauchi J;Miyamoto Y;Chan JR;Tanoue A
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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