Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 287, Issue 41, Pages 34474-34483Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M112.401406
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Funding
- National Institutes of Health [AR056296, AI101935, CA163507]
- European Union [256432]
- European Research Council [281600]
- Fund for Scientific Research-Flanders [G030212N, 1.2.201.10.N.00, 1.5.122.11.N.00]
- American Lebanese Syrian Associated Charities (ALSAC)
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Enteric pathogens represent a major cause of morbidity and mortality worldwide. Toll-like receptor (TLR) and inflammasome signaling are critical for host responses against these pathogens, but how these pathways are integrated remains unclear. Here, we show that TLR4 and the TLR adaptor TRIF are required for inflammasome activation in macrophages infected with the enteric pathogens Escherichia coli and Citrobacter rodentium. In contrast, TLR4 and TRIF were dispensable for Salmonella typhimurium-induced caspase-1 activation. TRIF regulated expression of caspase-11, a caspase-1-related protease that is critical for E. coli-and C. rodentium-induced inflammasome activation, but dispensable for inflammasome activation by S. typhimurium. Thus, TLR4- and TRIF-induced caspase-11 synthesis is critical for noncanonical Nlrp3 inflammasome activation in macrophages infected with enteric pathogens.
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