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The adaptor protein CARD9 is required for innate immune responses to intracellular pathogens.

Authors:
Hsu YM, Zhang Y, You Y, Wang D, Li H, Duramad O, Qin XF, Dong C, Lin X
Affiliation:
Journal:
Nature immunology

Abstract

The caspase-recruitment domain-containing adaptor protein CARD9 regulates the innate signaling responses to fungal infection. Here we show that CARD9 is required for innate immune responses against intracellular pathogens. We generated Card9(-/-) mice and found that CARD9-deficient macrophages had defects in activation of the kinases p38 and Jnk but not of transcription factor NF-kappaB after bacterial and viral infection. CARD9-deficient mice failed to clear infection and showed altered cytokine production after challenge with Listeria monocytogenes. In wild-type cells, we found CARD9 inducibly associated with both the intracellular 'biosensor' Nod2 and the serine-threonine kinase RICK. Our data demonstrate that CARD9 has a critical function in Nod2-mediated activation of p38 and Jnk in innate immune responses to intracellular pathogens.

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