Abstract
To investigate the importance of proteolysis of NF-κB1 p105 induced by the kinase IKK in activation of the transcription factor NF-κB, we generated 'Nfkb1SSAA/SSAA' mice, in which the IKK-target serine residues of p105 were substituted with alanine. Nfkb1SSAA/SSAA mice had far fewer CD4+ regulatory and memory T cells because of cell-autonomous defects. These T cell subtypes require activation of NF-κB by the T cell antigen receptor for their generation, and the Nfkb1SSAA mutation resulted in less activation of NF-κB in CD4+ T cells and proliferation of CD4+ T cells after stimulation of the T cell antigen receptor. The Nfkb1SSAA mutation also blocked the ability of CD4+ T cells to provide help to wild-type B cells during a primary antibody response. IKK-induced p105 proteolysis is therefore essential for optimal T cell antigen receptor–induced activation of NF-κB and mature CD4+ T cell function.
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Acknowledgements
We thank P. Tsichlis (Tufts University) and Thomas Jefferson University for Map3k8−/− mice; B. Stockinger and A. O'Garra for advice and critical reading of the manuscript; H. Allen for encouragement at the start of the project; G. Kassiotis for advice on assays for T cell helper function; and the National Institute for Medical Research PhotoGraphics section, Biological Services and flow cytometry service and members of the Ley laboratory for help during the course of this work. Supported by the UK Medical Research Council.
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S.S. did experiments for Figures 1, 2, 3, 4, 5, 6, 7, 8; M.P.B. generated the Nfkb1SSAA mutant mouse strain and did experiments for Figure 9; S.P. did experiments for Figures 4e,f and 6e,f; J.J. assayed mRNA by quantitative RT-PCR and IL-2 by ELISA and provided technical support for many experiments; V.T. advised in the design of the Nfkb1SSAA targeting construct and the generation of mutant mouse strains; B.S. helped with the experimental design and several in vivo experiments; and S.C.L. designed the experiments in conjunction with S.S., M.P.B., S.P., J.J. and B.S. and wrote the manuscript.
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Sriskantharajah, S., Belich, M., Papoutsopoulou, S. et al. Proteolysis of NF-κB1 p105 is essential for T cell antigen receptor–induced proliferation. Nat Immunol 10, 38–47 (2009). https://doi.org/10.1038/ni.1685
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DOI: https://doi.org/10.1038/ni.1685