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• W1569043365 abstract "It has been proposed that during T cell receptor antigen recognition, CD4- or CD8-p56lck molecules interact with the T cell antigen receptor-CD3 complex (TCR-CD3) to phosphorylate various undefined substrates, which then initiate signal transduction through the TCR-CD3 complex. The ability of CD4 to modulate the TCR-CD3-induced increase in intracellular Ca2+, [Ca2+]i, and substrate tyrosine phosphorylation was studied in mutants of the human leukemic T cell line HPB-ALL characterized by their low expression of the TCR-CD3 complex on the cell surface. In TCR-CD3low cells, in which CD3-zeta was found to be associated with the TCR-CD3 complex, cross-linking CD3 with CD4 resulted in a profile of calcium mobilization, CD3-zeta, and phospholipase C-gamma 1 tyrosine phosphorylation similar to that observed in HPB-ALL cells, although the magnitude of generalized substrate tyrosine phosphorylation appeared to be smaller, as compared with wild-type cells. Responses were weak or absent when CD3 was cross-linked alone. In contrast, in a mutant in which association of CD3-zeta 2 with the TCR-CD3 was defective, cross-linking of CD3 with CD4 had a weaker effect on any of the activation parameters tested. These experiments showed that the presence of CD3-zeta 2 in the TCR-CD3 complex is of critical importance for the ability of CD4 to enhance early transducing signals inside the cell. The data also suggest that CD4-associated protein tyrosine kinase p56lck could up-regulate defective CD3-mediated induction of phospholipase C activity by increasing tyrosine phosphorylation of phospholipase C-gamma 1." @default.
• W1569043365 created "2016-06-24" @default.
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• W1569043365 date "1992-04-01" @default.
• W1569043365 modified "2023-10-18" @default.
• W1569043365 title "CD3-zeta surface expression is required for CD4-p56lck-mediated upregulation of T cell antigen receptor-CD3 signaling in T cells." @default.
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• W1569043365 doi "https://doi.org/10.1016/s0021-9258(18)42594-x" @default.
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