The Csk-Associated Adaptor PAG Inhibits Effector T Cell Activation in Cooperation with Phosphatase PTPN22 and Dok Adaptors.
The Csk-Associated Adaptor PAG Inhibits Effector T Cell Activation in Cooperation with Phosphatase PTPN22 and Dok Adaptors.
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DOI:
10.1016/j.celrep.2016.11.035
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发表时间:
2016-12-06
期刊:
影响因子:
8.8
通讯作者:
Veillette A
中科院分区:
文献类型:
--
作者:
Davidson D;Zhong MC;Pandolfi PP;Bolland S;Xavier RJ;Seed B;Li X;Gu H;Veillette A
Transmembrane adaptor PAG (Cbp) has been proposed to mediate membrane recruitment of Csk, a cytoplasmic protein tyrosine kinase playing a critical inhibitory role during T cell activation, by inactivating membrane-associated Src kinases. However, this model has not been validated by genetic evidence. Here we demonstrate that PAG-deficient mice display enhanced T cell activation responses in effector, but not in naive, T cells. PAG-deficient mice also have augmented T cell-dependent autoimmunity and greater resistance to T cell anergy. Interestingly, in absence of PAG, Csk becomes more associated with alternative partners, i.e. phosphatase PTPN22 and Dok adaptors. Combining PAG deficiency with PTPN22 or Dok adaptor deficiency further enhances effector T cell responses. Unlike PAG, Cbl ubiquitin ligases inhibit activation of naïve, but not of effector, T cells. Thus, Csk-associating PAG is a critical component of the inhibitory machinery controlling effector T cell activation, in cooperation with PTPN22 and Dok adaptors.
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