Journal
JOURNAL OF IMMUNOLOGY
Volume 173, Issue 3, Pages 1612-1619Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.173.3.1612
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- NIAID NIH HHS [AI057947] Funding Source: Medline
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Signal transduction from proinflammatory stimuli leading to NF-kappaB-dependent gene expression is mediated by the IkappaB kinase 2 (IKK2/IKKbeta). Therefore, IKK2 has become an important drug target for treatment of inflammatory conditions. T cells, whose activation depends to a large extent on the activity of NF-kappaB transcription factors, play important roles in inflammation and autoimmunity. Ablation of IKK2 specifically in T cells in CD4cre/Ikk2(FL) mice allows their survival and activation by polyclonal stimuli in vitro, suggesting that IKK2 is dispensable for T cell activation. We report in this study that IKK2-deficient T cells expand efficiently in response to superantigen administration in vivo, but are completely deficient in recall responses, most likely due to inefficient priming. IKK2-deficient T cells provide suboptimal B cell help and fail to support germinal center reactions. Finally, IKK2 is essential for homeostatic expansion of naive T cells, reflected by the inability of IKK2-deficient T cells to induce colitis in lymphopenic hosts.
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