Journal
TRENDS IN IMMUNOLOGY
Volume 34, Issue 6, Pages 243-250Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.it.2013.02.006
Keywords
innate immunity; pattern recognition receptor signaling NF-kappa B; host protection; inflammatory disease
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Funding
- SFB grants by the Deutsche Forschungsgemeinschaft
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Caspase recruitment domain-containing protein (Card)9 is a nonredundant adapter protein that functions in the innate immune system in the assembly of multifunctional signaling complexes. Together with B cell lymphoma (Bcl)10 and the paracaspase, mucosa-associated lymphoid tissue lymphoma translocation protein (Malt)1, Card9 links spleen-tyrosine kinase (Syk)-coupled C-type lectin receptors to inflammatory responses. Card9 signaling also responds to intracellular danger sensors, such as retinoic acid-inducible gene 1 (RIG-I)-like receptors (RLRs) and nucleotide-oligomerization domain (Nod)2. Card9 complexes are engaged upon fungal, bacterial, or viral recognition, and they are essential for host protection. Moreover, Card9 polymorphisms are commonly associated with human inflammatory diseases. Here, we discuss the molecular regulation and the physiological functions of Card9 in host defense and immune homeostasis, and provide a framework for the therapeutic targeting of Card9 signaling in immune-mediated diseases.
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