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- W2129013406 abstract "Interaction of the TCR complex with self- or foreign peptides is a central event in the immune responses. Upon TCR stimulation, a protein-tyrosine kinase (PTK), ZAP-70, is recruited to signaling units of the TCR complex, such as TCRzeta, to play an essential role in T cell activation. Here, we find that mice lacking adaptor proteins Dok-1 and Dok-2 show augmented responses to thymus-dependent, but not thymus-independent, antigens, and that their T cells show elevated responses to TCR stimulation, including the activation of ZAP-70 and subsequent proliferation and cytokine production. Furthermore, the forced expression of Dok-1 or Dok-2 in a CD3(+)CD4(+) T cell clone inhibited the activation of ZAP-70 upon TCR stimulation. Interestingly, the Dok-1 and Dok-2 COOH-terminal moieties bearing the src homology 2 target motifs were dispensable for this negative regulation, even though they are crucial for the known adaptor function of Dok-family proteins. Thus, by an as yet unidentified mechanism, Dok-1 and Dok-2 play an essential role in the negative regulation of TCR signaling. Consistently, all mice lacking these proteins exhibited elevated titers of antibodies to double-stranded DNA and developed lupus-like renal disease." @default.
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- W2129013406 date "2007-02-20" @default.
- W2129013406 modified "2023-10-16" @default.
- W2129013406 title "Dok-1 and Dok-2 are negative regulators of T cell receptor signaling" @default.
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- W2129013406 doi "https://doi.org/10.1093/intimm/dxm015" @default.
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