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CARD9 negatively regulates NLRP3-induced IL-1? production on Salmonella infection of macrophages.


ABSTRACT: Interleukin-1? (IL-1?) is a proinflammatory cytokine required for host control of bacterial infections, and its production must be tightly regulated to prevent excessive inflammation. Here we show that caspase recruitment domain-containing protein 9 (CARD9), a protein associated with induction of proinflammatory cytokines by fungi, has a negative role on IL-1? production during bacterial infection. Specifically, in response to activation of the nucleotide oligomerization domain receptor pyrin-domain containing protein 3 (NLRP3) by Salmonella infection, CARD9 negatively regulates IL-1? by fine-tuning pro-IL-1? expression, spleen tyrosine kinase (SYK)-mediated NLRP3 activation and repressing inflammasome-associated caspase-8 activity. CARD9 is suppressed during Salmonella enterica serovar Typhimurium infection, facilitating increased IL-1? production. CARD9 is, therefore, a central signalling hub that coordinates a pathogen-specific host inflammatory response.

SUBMITTER: Pereira M 

PROVIDER: S-EPMC5052644 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature

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CARD9 negatively regulates NLRP3-induced IL-1β production on Salmonella infection of macrophages.

Pereira Milton M   Tourlomousis Panagiotis P   Wright John J   P Monie Tom T   Bryant Clare E CE  

Nature communications 20160927


Interleukin-1β (IL-1β) is a proinflammatory cytokine required for host control of bacterial infections, and its production must be tightly regulated to prevent excessive inflammation. Here we show that caspase recruitment domain-containing protein 9 (CARD9), a protein associated with induction of proinflammatory cytokines by fungi, has a negative role on IL-1β production during bacterial infection. Specifically, in response to activation of the nucleotide oligomerization domain receptor pyrin-do  ...[more]

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