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Sepsis is a severe and complicated syndrome that is characterized by dysregulation of host inflammatory responses and organ failure, with high morbidity and mortality. The literature implies that autophagy is a crucial regulator of inflammation in sepsis. In this article, we report that autophagy-related protein 7 (Atg7) is involved in inflammasome activation in Pseudomonas aeruginosa abdominal infection. Following i.p. challenge with P. aeruginosa , atg7 fl/fl  mice showed impaired pathogen clearance, decreased survival, and widespread dissemination of bacteria into the blood and lung tissue compared with wild-type mice. The septic atg7 fl/fl  mice also exhibited elevated neutrophil infiltration and severe lung injury. Loss of Atg7 resulted in increased production of IL-1β and pyroptosis, consistent with enhanced inflammasome activation. Furthermore, we demonstrated that P. aeruginosa flagellin is a chief trigger of inflammasome activation in the sepsis model. Collectively, our results provide insight into innate immunity and inflammasome activation in sepsis.

Atg7 Deficiency Intensifies Inflammasome Activation and Pyroptosis in Pseudomonas Sepsis