The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 183, 413-420, Copyright © 1996 by Rockefeller University Press


ARTICLES

T cell responses in calcineurin A alpha-deficient mice

BW Zhang, G Zimmer, J Chen, D Ladd, E Li, FW Alt, G Wiederrecht, J Cryan, EA O'Neill, CE Seidman, AK Abbas and JG Seidman
Howard Hughes Medical Institute, Harvard Medical School, Boston, Massachusetts 02115, USA.

We have created embryonic stem (ES) cells and mice lacking the predominant isoform (alpha) of the calcineurin A subunit (CNA alpha) to study the role of this serine/threonine phosphatase in the immune system. T and B cell maturation appeared to be normal in CNA alpha -/- mice. CNA alpha -/- T cells responded normally to mitogenic stimulation (i.e., PMA plus ionomycin, concanavalin A, and anti-CD3 epsilon antibody). However, CNA alpha -/- mice generated defective antigen- specific T cell responses in vivo. Mice produced from CNA alpha -/- ES cells injected into RAG-2-deficient blastocysts had a similar defective T cell response, indicating that CNA alpha is required for T cell function per se, rather than for an activity of other cell types involved in the immune response. CNA alpha -/- T cells remained sensitive to both cyclosporin A and FK506, suggesting that CNA beta or another CNA-like molecule can mediate the action of these immunosuppressive drugs. CNA alpha -/- mice provide an animal model for dissecting the physiologic functions of calcineurin as well as the effects of FK506 and CsA.
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