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The Journal of Immunology, 2000, 164: 2987-2993.
Copyright © 2000 by The American Association of Immunologists

Induction of T Cell Anergy in the Absence of CTLA-4/B7 Interaction1

Kenneth A. Frauwirth*, Maria-Luisa Alegre{dagger} and Craig B. Thompson2,*

* Abramson Family Cancer Research Institute and Department of Cancer Biology, University of Pennsylvania, Philadelphia, PA 19104; and {dagger} Department of Medicine, University of Chicago, Chicago, IL 60637

Immunologic tolerance in T lymphocytes is maintained through both thymic and peripheral contributions. One peripheral tolerance mechanism is the induction of T cell anergy, a form of nonresponsiveness resulting from incomplete T cell activation, such as stimulation through the TCR in the absence of costimulation. Recent reports have suggested that engagement of the inhibitory receptor CTLA-4 by its B7 ligand is critical for the initiation of anergy. We tested the importance of CTLA-4 in anergy induction in primary T cells with an in vitro anergy system. Using both CTLA-4/B7-blocking agents and CTLA-4-deficient T cells, we found that T cell anergy can be established in the absence of CTLA-4 expression and/or function. Even in the absence of CTLA-4 signal transduction, T cells activated solely through TCR ligation lose the ability to proliferate as a result of autocrine IL-2 production upon subsequent receptor engagement. Thus, CTLA-4 signaling is not required for the development of T cell anergy.




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