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• W2233510147 abstract "Bacterial pneumonia and sepsis are two important causes of mortality in the world. Emergence of multidrug resistant bacteria has necessitated the development of new treatment and/or prevention strategies to augment host immune defense. In this context, the innate host defense is critical in clearing pathogenic bacteria from the host. Early neutrophil recruitment is a critical step in a multistep requence leading to bacterial clearance. Pattern recognition receptors (PRRs) play a critical role in the innate immune system. Receptor interacting protein 2 (RIP-2) is an adaptor for the nod-like receptors (NLR) NOD1 and NOD2. Nucleotide oligomerisation domain 2 (NOD2) is an intracellular PRR that is shown to be important for host defense against intracellular bacterial pathogens. However, the role of NOD2 and RIP-2 during Gram-negative bacterial pneumonia and polymicrobial sepsis has not been explored. Thus, we hypothesize that the NOD2/RIP-2 axis is critical for host defense during bacterial pneumonia and sepsis/septic peritonitis. To test this hypothesis, we infected NOD2(NOD2-/-), RIP-2(RIP-2-/-) deficient mice intratracheally (i.t) with E. coli (106 CFUs/mouse) and Klebsiella pneumoniae (103 CFUs/mouse). We observed that NOD2/RIP2 signaling is critical for the host defense during gram-negative pneumonia and poly microbial sepsis. The NOD2/RIP2 axis regulates neutrophil recruitment via IL-17A production. We also found that NOD2/RIP-2 signaling is essential for the production of IL-6 and activation of STAT3. We demonstrated that RIP-2 regulates inflammasome activity that is independent of NOD2 signaling. Taken together, these data demonstrate that the NOD2/RIP-2 axis plays a critical role in neutrophil-mediated host defense through IL-17A production and by inflammasome activation. In cecal ligation puncture (CLP) induced sepsis, RIP2-/- mice show increased mortality with higher bacterial burden in the peritoneum and systemic organs compared to WT controls. We found reduced neutrophil influx IL-17A and IL-1beta levels in the peritoneum of RIP2-/- mice after CLP. Furthermore, we also observed increased systemic inflammation accompanied by vital organ damage in the knockout mice. As a whole our data suggest a critical role of RIP2 in neutrophil recruitment, along with IL-17A and IL-1beta during sepsis." @default.
• W2233510147 created "2016-06-24" @default.
• W2233510147 creator A5014904559 @default.
• W2233510147 date "2022-06-10" @default.
• W2233510147 modified "2023-10-06" @default.
• W2233510147 title "Role of NOD2/RIP2 signaling in acute bacterial pneumonia and sepsis" @default.
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• W2233510147 doi "https://doi.org/10.31390/gradschool_dissertations.638" @default.
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