Clostridioides difficile infection damages colonic stem cells via TcdB, impairing epithelial repair and recovery from disease.

Abstract:

:Gastrointestinal infections often induce epithelial damage that must be repaired for optimal gut function. While intestinal stem cells are critical for this regeneration process [R. C. van der Wath, B. S. Gardiner, A. W. Burgess, D. W. Smith, PLoS One 8, e73204 (2013); S. Kozar et al., Cell Stem Cell 13, 626-633 (2013)], how they are impacted by enteric infections remains poorly defined. Here, we investigate infection-mediated damage to the colonic stem cell compartment and how this affects epithelial repair and recovery from infection. Using the pathogen Clostridioides difficile, we show that infection disrupts murine intestinal cellular organization and integrity deep into the epithelium, to expose the otherwise protected stem cell compartment, in a TcdB-mediated process. Exposure and susceptibility of colonic stem cells to intoxication compromises their function during infection, which diminishes their ability to repair the injured epithelium, shown by altered stem cell signaling and a reduction in the growth of colonic organoids from stem cells isolated from infected mice. We also show, using both mouse and human colonic organoids, that TcdB from epidemic ribotype 027 strains does not require Frizzled 1/2/7 binding to elicit this dysfunctional stem cell state. This stem cell dysfunction induces a significant delay in recovery and repair of the intestinal epithelium of up to 2 wk post the infection peak. Our results uncover a mechanism by which an enteric pathogen subverts repair processes by targeting stem cells during infection and preventing epithelial regeneration, which prolongs epithelial barrier impairment and creates an environment in which disease recurrence is likely.

authors

Mileto SJ,Jardé T,Childress KO,Jensen JL,Rogers AP,Kerr G,Hutton ML,Sheedlo MJ,Bloch SC,Shupe JA,Horvay K,Flores T,Engel R,Wilkins S,McMurrick PJ,Lacy DB,Abud HE,Lyras D

doi

10.1073/pnas.1915255117

subject

Has Abstract

pub_date

2020-04-07 00:00:00

pages

8064-8073

issue

14

eissn

0027-8424

issn

1091-6490

pii

1915255117

journal_volume

117

pub_type

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