Caspase-8 induces cleavage of gasdermin D to elicit pyroptosis during Yersinia infection
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- 31 October 2018
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 115 (46), E10888-E10897
- https://doi.org/10.1073/pnas.1809548115
Abstract
Cell death and inflammation are intimately linked during Yersinia infection. Pathogenic Yersinia inhibits the MAP kinase TGFβ-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-1α/β release. Furthermore, we found that human macrophages are resistant to YopJ-mediated pyroptosis, with dampened IL-1β 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.Keywords
Funding Information
- NIH/NIAID (AI126489)
- NIH/NIAID (AI126050)
- NIH/NIAID (AI056234)
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