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• W2155138367 abstract "Macrophages play a crucial role in the innate immune response against the human pathogen Streptococcus pyogenes, yet the innate immune response against the bacterium is poorly characterized. In the present study, we show that caspase-1 activation and IL-1beta secretion were induced by live, but not killed, S. pyogenes, and required expression of the pore-forming toxin streptolysin O. Using macrophages deficient in inflammasome components, we found that both NLR family pyrin domain-containing 3 (Nlrp3) and apoptosis-associated speck-like protein (Asc) were crucial for caspase-1 activation and IL-1beta secretion, but dispensable for pro-IL-1beta induction, in response to S. pyogenes infection. Conversely, macrophages deficient in the essential TLR adaptors Myd88 and Trif showed normal activation of caspase-1, but impaired induction of pro-IL-1beta and secretion of IL-1beta. Notably, activation of caspase-1 by TLR2 and TLR4 ligands in the presence of streptolysin O required Myd88/Trif, whereas that induced by S. pyogenes was blocked by inhibition of NF-kappaB. Unlike activation of the Nlrp3 inflammasome by TLR ligands, the induction of caspase-1 activation by S. pyogenes did not require exogenous ATP or the P2X7R. In vivo experiments revealed that Nlrp3 was critical for the production of IL-1beta but was not important for survival in a mouse model of S. pyogenes peritoneal infection. These results indicate that caspase-1 activation in response to S. pyogenes infection requires NF-kappaB and the virulence factor streptolysin O, but proceeds independently of P2X7R and TLR signaling." @default.
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• W2155138367 date "2009-10-07" @default.
• W2155138367 modified "2023-10-17" @default.
• W2155138367 title "Activation of the Nlrp3 Inflammasome by<i>Streptococcus pyogenes</i>Requires Streptolysin O and NF-κB Activation but Proceeds Independently of TLR Signaling and P2X7 Receptor" @default.
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• W2155138367 doi "https://doi.org/10.4049/jimmunol.0900444" @default.
• W2155138367 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2765568" @default.
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