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Blood, 1 August 2004, Vol. 104, No. 3, pp. 760-767. Prepublished online as a Blood First Edition Paper on April 1, 2004; DOI 10.1182/blood-2003-12-4314. This Article Full Text (PDF) All Versions of this Article: 2003-12-4314v1 104/3/760    most recent Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Taylor, N. Articles by Pelletier, L. Search for Related Content PubMed PubMed Citation Articles by Taylor, N. Articles by Pelletier, L. Social Bookmarking                   What's this?  Previous Article  |  Next Article  Submitted December 18, 2003 Accepted March 24, 2004 T cell receptor-induced phosphorylation of the chain is efficiently promoted by ZAP-70 but not Syk Naomi Taylor*, Marcos Steinberg, Adjali Oumeya, Louise Swainson, Peggy Merida, Nelly Noraz, Vincenzo di Bartolo, and Ludivine Pelletier Immunomodulation and Immunotherapy, Institut de Genetique Moleculaire de Montpellier, Montpellier, France Immunology, Institut Pasteur, Paris, France * Corresponding author; email: taylor{at}igm.cnrs-mop.fr. Engagement of the T cell receptor results in the activation of Lck/Fyn and ZAP-70/Syk tyrosine kinases. Lck-mediated tyrosine phosphorylation of signaling motifs (ITAMs) in the CD3- subunits of the TCR is an initial step in the transduction of signaling cascades. However, phosphorylation is also promoted by ZAP-70 as TCR-induced phosphorylation is defective in ZAP-70-deficient T cells. We show that this defect is corrected by stable expression of ZAP-70, but not Syk, in primary and transformed T cells. Indeed, these proteins are differentially coupled to the TCR with a 5-10 fold higher association of ZAP-70 with as compared to Syk. Low level Syk- binding is associated with significantly less Lck coupled to the TCR. Moreover, diminished coupling of Lck to correlates with a poor phosphorylation of the positive regulatory tyr352 residue of Syk. Thus, recruitment of Lck into the TCR complex with subsequent chain phosphorylation is promoted by ZAP-70 but not Syk. Importantly, the presence of ZAP-70 positively regulates the TCR-induced tyrosine phosphorylation of Syk. The interplay between Syk and ZAP-70 in thymocytes, certain T cells and B-chronic lymphocytic leukemia cells in which they are co-expressed, will therefore modulate the amplitude of antigen-mediated receptor signaling. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: A. Montel-Hagen, R. Vicente, and N. Taylor Unveiling ZAP-70's plan B Blood, March 1, 2008; 111(5): 2501 - 2502. [Full Text] [PDF] L. Chen, L. Huynh, J. Apgar, L. Tang, L. Rassenti, A. Weiss, and T. J. Kipps ZAP-70 enhances IgM signaling independent of its kinase activity in chronic lymphocytic leukemia Blood, March 1, 2008; 111(5): 2685 - 2692. [Abstract] [Full Text] [PDF] I. H. Khan, S. Mendoza, P. Rhyne, M. Ziman, J. Tuscano, D. Eisinger, H.-J. Kung, and P. A. Luciw Multiplex Analysis of Intracellular Signaling Pathways in Lymphoid Cells by Microbead Suspension Arrays Mol. Cell. Proteomics, April 1, 2006; 5(4): 758 - 768. [Abstract] [Full Text] [PDF]

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