The Src-family and Syk/ZAP-70 family of protein tyrosine kinases (PTK) are required for T cell receptor (TCR) functions. We provide evidence that the Src-family PTK Lck is responsible for regulating the constitutive tyrosine phosphorylation of the TCR zeta subunit in murine thymocytes. Moreover, ligation of the TCR expressed on thymocytes from Lck-deficient mice largely failed to induce the phosphorylation of TCR-zeta, CD3 epsilon, or ZAP-70. In contrast, we find that the TCR-zeta subunit is weakly constitutively tyrosine phosphorylated in peripheral T cells isolated from Lck-null mice. These data suggest that Lck has a functional role in regulation of TCR signal transduction in thymocytes. In peripheral T cells, other Src-family PTKs such as Fyn may partially compensate for the absence of Lck.
Lck regulates the tyrosine phosphorylation of the T cell receptor subunits and ZAP-70 in murine thymocytes.
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N S van Oers, N Killeen, A Weiss; Lck regulates the tyrosine phosphorylation of the T cell receptor subunits and ZAP-70 in murine thymocytes.. J Exp Med 1 March 1996; 183 (3): 1053–1062. doi: https://doi.org/10.1084/jem.183.3.1053
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