Abstract
NF-κB (Rel) transcription factors control physiological and pathological immune cell function. The scaffold proteins Bcl-10 and MALT1 couple antigen-receptor signals to the canonical NF-κB pathway and are pivotal in lymphomagenesis. Here we found that Bcl-10 and MALT1 differentially regulated B cell receptor–induced activation of RelA and c-Rel. Bcl-10 was essential for recruitment of the kinase IKK into lipid rafts for the activation of RelA and c-Rel, for blocking apoptosis and for inducing division after B cell receptor ligation. In contrast, MALT1 participated in survival signaling but was not involved in IKK recruitment or activation and was dispensable for RelA induction and proliferation. MALT1 selectively activated c-Rel to control a distinct subprogram. Our results provide mechanistic insights into B cell receptor–induced survival and proliferation signals and demonstrate the selective control of c-Rel in the canonical NF-κB pathway.
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Acknowledgements
We thank F. Greten, T. Mak and M. Reth for scientific discussions; M. Schiemann for cell sorting; G. Häcker (Technical University Munich) for vav-Bcl2 transgenic mice; V. Dixit (Genentech) for anti-MALT1; and E. Muggleton for critically reading the manuscript. Supported by Deutsche Forschungsgemeinschaft (Sonderforschungsbereiche grants) and Deutsche Krebshilfe (Max-Eder-Program grant to J.R).
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J.R. designed and coordinated the study, analyzed data and wrote the paper; U.F. coordinated the study, did experiments, analyzed data and contributed to manuscript writing; D.K. and C.P. contributed intellectual input; and C.M.z.B., A.G., E.W. and S.R. cooperated in experiments and data analysis.
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Ferch, U., Büschenfelde, C., Gewies, A. et al. MALT1 directs B cell receptor–induced canonical nuclear factor-κB signaling selectively to the c-Rel subunit. Nat Immunol 8, 984–991 (2007). https://doi.org/10.1038/ni1493
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DOI: https://doi.org/10.1038/ni1493
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