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The Journal of Immunology, 00, 165: 1743-1754.
Copyright © 00 by The American Association of Immunologists

The NF-{kappa}B Cascade Is Important in Bcl-xL Expression and for the Anti-Apoptotic Effects of the CD28 Receptor in Primary Human CD4+ Lymphocytes1

Ali Khoshnan*, Charles Tindell*, Isett Laux*, David Bae*, Brydon Bennett{dagger} and Andre E. Nel2,*

* Division of Clinical Immunology and Allergy, Department of Medicine, University of California, Los Angeles, CA 90095; and {dagger} Signal Pharmaceuticals, San Diego, CA 92121

We explored the role of the NF-{kappa}B pathway in the survival of primary human CD4+ T lymphocytes during CD28 costimulation. Transduction of proliferating CD4+ T cells with a tetracycline-regulated retrovirus encoding for a dominant-interfering, degradation-resistant I-{kappa}B{alpha} (inhibitor of {kappa}B{alpha} factor) mutant induced apoptosis. Using DNA arrays, we show that Bcl-xL features as a prominent anti-apoptotic member among a number of early CD28-inducible genes. A 1.2-kb segment of the proximal Bcl-xL promoter, linked to a luciferase reporter, responded to CD3/CD28 stimulation in Jurkat cells. Mutation of an NF-{kappa}B site around -840 decreased, while ectopic expression of I-{kappa}B kinase-ß (IKKß) enhanced reporter gene activity. Na+-salicylate and cyclopentenone PGs, direct inhibitors of IKKß, interfered in the activation of the Bcl-xL promoter and induced apoptosis in CD28-costimulated CD4+ T cells. Moreover, salicylate blocked nuclear localization of NF-{kappa}B factors that bind to the NF-{kappa}B binding site in the Bcl-xL promoter, as well as the expression of Bcl-xL protein. HuT-78, a lymphoblastoid T cell line with constitutive NF-{kappa}B activity, contained elevated levels of Bcl-xL protein and, similar to proliferating CD4+ T cells, was resistant to apoptotic stimuli such as anti-Fas and TNF-{alpha}. In contrast, the same stimuli readily induced apoptosis in a Jurkat T cell clone with no detectable Bcl-xL expression. Jurkat BMS2 cells also differed from HuT-78 in collapse of mitochondrial membrane potential and superoxide generation in the mitochondrium. Taken together, these data demonstrate that CD3/CD28-induced activation of IKKß and expression of Bcl-xL promote the survival of primary human CD4+ T lymphocytes.




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