Caspase-8 induces cleavage of gasdermin D to elicit pyroptosis during Yersinia infection.

ABSTRACT: Cell death and inflammation are intimately linked during Yersinia infection. Pathogenic Yersinia inhibits the MAP kinase TGF?-activated kinase 1 (TAK1) via the effector YopJ, thereby silencing cytokine expression while activating caspase-8-mediated cell death. Here, using Yersinia pseudotuberculosis in corroboration with costimulation of lipopolysaccharide and (5Z)-7-Oxozeaenol, a small-molecule inhibitor of TAK1, we show that caspase-8 activation during TAK1 inhibition results in cleavage of both gasdermin D (GSDMD) and gasdermin E (GSDME) in murine macrophages, resulting in pyroptosis. Loss of GsdmD delays membrane rupture, reverting the cell-death morphology to apoptosis. We found that the Yersinia-driven IL-1 response arises from asynchrony of macrophage death during bulk infections in which two cellular populations are required to provide signal 1 and signal 2 for IL-1?/? release. Furthermore, we found that human macrophages are resistant to YopJ-mediated pyroptosis, with dampened IL-1? production. Our results uncover a form of caspase-8-mediated pyroptosis and suggest a hypothesis for the increased sensitivity of humans to Yersinia infection compared with the rodent reservoir.

SUBMITTER: Sarhan J 

PROVIDER: S-EPMC6243247 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature