Gasdermin D is the only Gasdermin that provides non-redundant protection against acuteSalmonellagut infection

Gasdermins (GSDMs) share a common functional domain structure and are best known for their capacity to form membrane pores. These pores are hallmarks of a specific form of cell death called pyroptosis and mediate the secretion of pro-inflammatory cytokines such as interleukin 1β (IL1β) and interleukin 18 (IL18). Thereby, Gasdermins have been implicated in various immune responses against cancer and infectious diseases such as acuteSalmonellaTyphimurium (S.Tm) gut infection. However, to date, we lack a comprehensive functional assessment of the different Gasdermins (GSDMA-E) duringS.Tm infectionin vivo. Here, we have performed littermate-controlled oralS.Tm infections to investigate the impact of all murine Gasdermins. While GSDMA, -C and -E appear dispensable, we show that GSDMD (i) restrictsS.Tm loads in the gut tissue and systemic organs, (ii) controls gut inflammation kinetics, and (iii) prevents epithelium disruption by 72h of the infection. Full protection requires GSDMD expression by both bone-marrow-derived lamina propria cells and intestinal epithelial cells (IECs).In vivoexperiments, 3D- and 2D-enteroid infections further show that infected IEC extrusion proceeds also without GSDMD, but that GSDMD controls the permeabilization and morphology of the extruding cells and affects extrusion kinetics. As such, this work identifies a non-redundant multipronged role of GSDMD in mucosal tissue defence against a common enteric pathogen.HIGHLIGHTSGasdermin D restrictsSalmonellaTyphimurium (S.Tm) translocation across the gut tissue, controls gut inflammation kinetics, and prevents epithelium disruption by 72h of the infection.Gasdermins A, C and E appear dispensable for protection against acuteS.Tm gut infection.Gasdermin D in bone-marrow-derived lamina propria cells and intestinal epithelial cells complement each other to suppress gut tissueS.Tm loads.Gasdermin D is not required for extrusion of infected intestinal epithelial cells but drives their permeabilization and affects qualitative features of the extrusion process.