Differential requirements for ZAP-70 in TCR signaling and T cell development

Theresa A. Kadlecek, Nicolai S C Van Oers, Leo Lefrancois, Sara Olson, Deborah Finlay, David H. Chu, Kari Connolly, Nigel Killeen, Arthur Weiss

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The Syk/ZAP-70 family of protein tyrosine kinases is indispensable for normal lymphoid development. Syk is necessary for the development of B cells and epithelial γδ T cells, whereas ZAP-70 is essential for the normal development of T cells and TCR signaling. In this study, we show that although development of the αβ lineage was arrested in the thymus, CD3- positive T cells, primarily of the γδ lineage, were present in the lymph nodes of mice lacking ZAP-70. Moreover, in the absence of ZAP-70, dendritic epidermal T cells were fewer in number and of abnormal morphology, and intestinal intraepithelial lymphocytes, normally containing a large proportion of γδ T cells, were markedly reduced. These data suggest that γδ T cells show a variable dependence upon ZAP-70 for their development. Biochemical analyses of thymocytes revealed a lack of basal ζ-chain tyrosine phosphorylation. However, several other substrates were inducibly tyrosine phosphoryiated following TCR stimulation. Thus, TCR-mediated signaling in ZAP-70-deficient thymocytes is only partially impaired. These studies suggest that Syk compensates only partially for the loss of ZAP-70, and that there is an absolute requirement of ZAP-70 for αβ T cells and epithelial γδ T cells, but not for some γδ T cells in peripheral lymphoid tissues.

Original languageEnglish (US)
Pages (from-to)4688-4694
Number of pages7
JournalJournal of Immunology
Issue number9
StatePublished - Nov 1 1998

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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    Kadlecek, T. A., Van Oers, N. S. C., Lefrancois, L., Olson, S., Finlay, D., Chu, D. H., Connolly, K., Killeen, N., & Weiss, A. (1998). Differential requirements for ZAP-70 in TCR signaling and T cell development. Journal of Immunology, 161(9), 4688-4694.