Apoptosis of intestinal epithelial cells restricts Clostridium difficile infection in a model of pseudomembranous colitis.

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 Commun

journal_title

Nature communications

authors

Saavedra PHV,Huang L,Ghazavi F,Kourula S,Vanden Berghe T,Takahashi N,Vandenabeele P,Lamkanfi M

doi

10.1038/s41467-018-07386-5

subject

Has Abstract

pub_date

2018-11-19 00:00:00

pages

4846

issue

1

issn

2041-1723

pii

10.1038/s41467-018-07386-5

journal_volume

9

pub_type

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