Abstract:
:Clostridium difficile is the leading cause of pseudomembranous colitis in hospitalized patients. C. difficile enterotoxins TcdA and TcdB promote this inflammatory condition via a cytotoxic response on intestinal epithelial cells (IECs), but the underlying mechanisms are incompletely understood. Additionally, TcdA and TcdB engage the Pyrin inflammasome in macrophages, but whether Pyrin modulates CDI pathophysiology is unknown. Here we show that the Pyrin inflammasome is not functional in IECs and that Pyrin signaling is dispensable for CDI-associated IEC death and for in vivo pathogenesis. Instead, our studies establish that C. difficile enterotoxins induce activation of executioner caspases 3/7 via the intrinsic apoptosis pathway, and demonstrate that caspase-3/7-mediated IEC apoptosis is critical for in vivo host defense during early stages of CDI. In conclusion, our findings dismiss a critical role for inflammasomes in CDI pathogenesis, and identify IEC apoptosis as a host defense mechanism that restricts C. difficile infection in vivo.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Saavedra PHV,Huang L,Ghazavi F,Kourula S,Vanden Berghe T,Takahashi N,Vandenabeele P,Lamkanfi Mdoi
10.1038/s41467-018-07386-5subject
Has Abstractpub_date
2018-11-19 00:00:00pages
4846issue
1issn
2041-1723pii
10.1038/s41467-018-07386-5journal_volume
9pub_type
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