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CD43 regulates the threshold for T cell activation by targeting Cbl functions
Author(s) -
PedrazaAlva Gustavo,
Mérida Lilia B.,
del Rio Roxana,
Fierro Nora A.,
CruzMuñoz Mario E.,
Olivares Norma,
Melchy Erika,
Igras Vivian,
Holländer Georg A.,
Burakoff Steven J.,
Rosenstein Yvonne
Publication year - 2011
Publication title -
iubmb life
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.132
H-Index - 113
eISSN - 1521-6551
pISSN - 1521-6543
DOI - 10.1002/iub.554
Subject(s) - t cell receptor , microbiology and biotechnology , t cell , phosphorylation , tyrosine phosphorylation , jurkat cells , signal transduction , intracellular , chemistry , cell signaling , cd3 , biology , immune system , cd8 , immunology
T cell (TC) activation requires the coordinated signaling of the T cell receptor (TCR) and coreceptor molecules, allowing TCs to respond to lower degrees of TCR occupancy. Coreceptor molecules set the threshold for TC activation by controlling different regulatory signaling loops. The Cbl family members prevent undesired activation of T cells by regulating TCR signals. In this report, we show that TC prestimulation by the CD43 coreceptor molecule before TCR engagement inhibits TCR‐dependent c‐Cbl tyrosine phosphorylation, c‐Cbl interaction with the adapter molecule Crk‐L and promotes Cbl‐b degradation in a PKCθ‐dependent manner. Consequently, the prolonged tyrosine phosphorylation and delayed degradation of ZAP‐70 and of the ζ chain lead to enhanced mitogen‐activated protein kinase activation and robust TC response. These data indicates that CD43‐mediated signals lower the threshold for TC activation by restricting the c‐Cbl and Cbl‐b inhibitory effects on TCR signaling. In addition to the strength and duration of intracellular signals, our data underscore temporality with which certain molecules are engaged as yet another mechanism to fine tune TC signal quality, and ultimately immune function. © 2011 IUBMB IUBMB Life, 2011