NF-kappaB transcription factors control physiological and pathological immune cell function. The scaffold proteins Bcl10 and Malt1 couple antigen receptor signals to the canonical NF-kappaB pathway. Here, Bcl10 and Malt1 were shown to differentially regulate B cell receptor-induced activation of the NF-kappaB subunits RelA and c-Rel. Bcl10 was essential for the recruitment of 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 signalling but was not involved in IKK recruitment or activation and was dispensable for RelA induction or proliferation. Malt1 selectively activated c-Rel to control a distinct subprogram. These 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-kappaB pathway.
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NF-kappaB transcription factors control physiological and pathological immune cell function. The scaffold proteins Bcl10 and Malt1 couple antigen receptor signals to the canonical NF-kappaB pathway. Here, Bcl10 and Malt1 were shown to differentially regulate B cell receptor-induced activation of the NF-kappaB subunits RelA and c-Rel. Bcl10 was essential for the recruitment of IKK into lipid rafts for the activation of RelA and c-Rel, for blocking apoptosis and for inducing division after B cell...
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