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J. Exp. Med., Volume 189, Number 1, January 4, 1999 145-158

An Essential Role for Nuclear Factor kappa B in Promoting Double Positive Thymocyte Apoptosis

By Thore Hettmann,* Joseph DiDonato,Dagger Michael Karin,Dagger and Jeffrey M. Leiden*

From the * Departments of Medicine and Pathology, University of Chicago, Chicago, Illinois 60637; and the Dagger  Department of Pharmacology, University of California San Diego, San Diego, California 92093

To examine the role of nuclear factor (NF)-kappa B in T cell development and activation in vivo, we produced transgenic mice that express a superinhibitory mutant form of inhibitor kappa B-alpha (Ikappa B-alpha A32/36) under the control of the T cell-specific CD2 promoter and enhancer (mutant [m]Ikappa B-alpha mice). Thymocyte development proceeded normally in the mIkappa B-alpha mice. However, the numbers of peripheral CD8+ T cells were significantly reduced in these animals. The mIkappa B-alpha thymocytes displayed a marked proliferative defect and significant reductions in interleukin (IL)-2, IL-3, and granulocyte/macrophage colony-stimulating factor production after cross-linking of the T cell antigen receptor. Perhaps more unexpectedly, double positive (CD4+CD8+; DP) thymocytes from the mIkappa B-alpha mice were resistant to alpha -CD3-mediated apoptosis in vivo. In contrast, they remained sensitive to apoptosis induced by gamma -irradiation. Apoptosis of wild-type DP thymocytes after in vivo administration of alpha -CD3 mAb was preceded by a significant reduction in the level of expression of the antiapoptotic gene, bcl-xL. In contrast, the DP mIkappa B-alpha thymocytes maintained high level expression of bcl-xL after alpha -CD3 treatment. Taken together, these results demonstrated important roles for NF-kappa B in both inducible cytokine expression and T cell proliferation after TCR engagement. In addition, NF-kappa B is required for the alpha -CD3-mediated apoptosis of DP thymocytes through a pathway that involves the regulation of the antiapoptotic gene, bcl-xL.

Key words: nuclear factor kappa Binhibitor kappa B-alpha A32/36thymocytesapoptosisbcl-xL


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