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Publication Detail

Title: TRAF3 enhances TCR signaling by regulating the inhibitors Csk and PTPN22.

Authors: Wallis, Alicia M; Wallace, Ellie C; Hostager, Bruce S; Yi, Zuoan; Houtman, Jon C D; Bishop, Gail A

Published In Sci Rep, (2017 May 18)

Abstract: The adaptor protein TNF receptor associated factor (TRAF) 3 is required for effective TCR signaling and normal T cell effector functions, and associates with the CD3/CD28 complex upon activation. To determine how TRAF3 promotes proximal TCR signaling, we studied TRAF3-deficient mouse and human T cells, which showed a marked reduction in activating phosphorylation of the TCR-associated kinase Lck. The impact of TRAF3 on this very early signaling event led to the hypothesis that TRAF3 restrains one or both of two known inhibitors of Lck, C-terminal Src kinase (Csk) and protein tyrosine phosphatase N22 (PTPN22). TRAF3 associated with Csk, promoting the dissociation of Csk from the plasma membrane. TRAF3 also associated with and regulated the TCR/CD28 induced localization of PTPN22. Loss of TRAF3 resulted in increased amounts of both Csk and PTPN22 in T cell membrane fractions and decreased association of PTPN22 with Csk. These findings identify a new role for T cell TRAF3 in promoting T cell activation, by regulating localization and functions of early TCR signaling inhibitors.

PubMed ID: 28522807 Exiting the NIEHS site

MeSH Terms: Animals; CSK Tyrosine-Protein Kinase; Cell Line, Tumor; Cell Membrane/metabolism; Cells, Cultured; HEK293 Cells; Humans; Mice; Mice, Inbred C57BL; Protein Binding; Protein Transport; Protein Tyrosine Phosphatase, Non-Receptor Type 22/metabolism; Receptors, Antigen, T-Cell/metabolism*; Signal Transduction*; T-Lymphocytes/metabolism; TNF Receptor-Associated Factor 3/genetics*; TNF Receptor-Associated Factor 3/metabolism; src-Family Kinases/metabolism

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