Rac activation by the T-cell receptor inhibits T cell migration.
Rac activation by the T-cell receptor inhibits T cell migration.
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DOI:
10.1371/journal.pone.0012393
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发表时间:
2010-08-25
期刊:
影响因子:
3.7
通讯作者:
Ridley AJ
中科院分区:
文献类型:
--
作者:
Cernuda-Morollón E;Millán J;Shipman M;Marelli-Berg FM;Ridley AJ
T cell migration is essential for immune responses and inflammation. Activation of the T-cell receptor (TCR) triggers a migration stop signal to facilitate interaction with antigen-presenting cells and cell retention at inflammatory sites, but the mechanisms responsible for this effect are not known. Migrating T cells are polarized with a lamellipodium at the front and uropod at the rear. Here we show that transient TCR activation induces prolonged inhibition of T-cell migration. TCR pre-activation leads to cells with multiple lamellipodia and lacking a uropod even after removal of the TCR signal. A similar phenotype is induced by expression of constitutively active Rac1, and TCR signaling activates Rac1. TCR signaling acts via Rac to reduce phosphorylation of ezrin/radixin/moesin proteins, which are required for uropod formation, and to increase stathmin phosphorylation, which regulates microtubule stability. T cell polarity and migration is partially restored by inhibiting Rac or by expressing constitutively active moesin. We propose that transient TCR signaling induces sustained inhibition of T cell migration via Rac1, increased stathmin phosphorylation and reduced ERM phosphorylation which act together to inhibit T-cell migratory polarity.
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