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J. Exp. Med.,
Volume 186, Number 10, November 17, 1997 1645-1653
and ZAP70
By
From the Division of Immunology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX
Amsterdam, The Netherlands
Cytotoxic T lymphocyte antigen 4 (CTLA-4) is an important regulator of T cell homeostasis.
Ligation of this receptor leads to prominent downregulation of T cell proliferation, mainly as a
consequence of interference with IL-2 production. We here report that CTLA-4 engagement
strikingly selectively shuts off activation of downstream T cell receptor (TCR)/CD28 signaling
events, i.e., activation of the microtubule-associated protein kinase (MAPKs) ERK and JNK.
In sharp contrast, proximal TCR signaling events such as ZAP70 and TCR-
chain phosphorylation are not affected by CTLA-4 engagement on activated T cells. Since activation of the
ERK and JNK kinases is required for stimulation of interleukin (IL)-2 transcription, these data
provide a molecular explanation for the block in IL-2 production imposed by CTLA-4.
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