期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 115, 期 46, 页码 E10888-E10897出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1809548115
关键词
pyroptosis; caspase-8; gasdermin; Yersinia; TAK1
资金
- National Institute of Allergy and Infectious Disease (NIAID) [AI135369]
- Russian Science Fund [15-15-00100]
- NIAID [T32-AI-007077]
- Russian Science Foundation [18-15-16000, 15-15-00100] Funding Source: Russian Science Foundation
Cell death and inflammation are intimately linked during Yersinia infection. Pathogenic Yersinia inhibits the MAP kinase TGFOactivated 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 alpha/beta release. Furthermore, we found that human macrophages are resistant to YopJ-mediated pyroptosis, with dampened IL-1 beta 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.
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