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Caspase-8, a proapoptotic protease, has an essential role inlymphocyte activation and protective immunity. We show thatcaspase-8 deficiency (CED) in humans and mice specifically abolishesactivation of the transcription factor nuclear factor B (NF-B)after stimulation through antigen receptors, Fc receptors, orToll-like receptor 4 in T, B, and natural killer cells. Caspase-8also causes the ß complex of the inhibitor of NF-Bkinase (IKK) to associate with the upstream Bcl10-MALT1 (mucosa-associatedlymphatic tissue) adapter complex. Recruitment of the IKK, ßcomplex, its activation, and the nuclear translocation of NF-Brequire enzyme activity of full-length caspase-8. These findingsthus explain the paradoxical association of defective apoptosisand combined immunodeficiency in human CED.
1 Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA. 2 Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA. 3 Ontario Cancer Institute, University of Toronto, Toronto, Ontario M5G 2C1, Canada.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: lenardo{at}nih.gov
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