CARD-Bcl10-Malt1 Signalosomes: Missing Link to NF-
B
Elmar Wegener and
Daniel Krappmann*
GSF--National Research Center for Environment and Health, Institute of Toxicology, Ingolstädter Landstrasse 1, D-85764 Neuherberg, Germany.
Abstract:
CARD11 (CARMA1), Bcl10, and Malt1 are required for nuclear factor NF-
B activation in response to antigen recognition. Initially, gene disruption experiments in mice pointed to a lymphocyte-specific role for CARD11-Bcl10-Malt1 complexes. However, strong evidence suggesting that conserved Bcl10-Malt1 complexes interact with different CARD scaffolds to connect various receptors in different cell types to NF-
B signaling has emerged more recently. The CARD10 (CARMA3)Bcl10-Malt1 signalosome functions as a link between G proteincoupled receptor (GPCR) signaling and proinflammatory NF-
B activation. Further, Dectin-1induced antifungal responses to NF-
B in dendritic cells depend on CARD9-Bcl10-Malt1. These results identify CARD-Bcl10-Malt1 signalosomes as pivotal regulators that link not only innate and adaptive immune responses, but also GPCR signaling, to the canonical NF-
B pathway.
*Corresponding author. E-mail, Daniel.Krappmann{at}gsf.de