TLR3, TRIF, and caspase 8 determine double-stranded RNA-induced epithelial cell death and survival in vivo

Christopher S. McAllister, Omar Lakhdari, Guillaume Pineton De Chambrun, Melanie Gareau, Alexis Broquet, Gin Hyug Lee, Steven Shenouda, Lars Eckmann, Martin F. Kagnoff

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41 Citations (Scopus)

Abstract

TLR3 signaling is activated by dsRNA, a virus-associated molecular pattern. Injection of dsRNA into mice induced a rapid, dramatic, and reversible remodeling of the small intestinal mucosa with significant villus shortening. Villus shortening was preceded by increased caspase 3 and 8 activation and apoptosis of intestinal epithelial cells (IECs) located in the mid to upper villus with ensuing luminal fluid accumulation and diarrhea because of an increased secretory state. Mice lacking TLR3 or the adaptor molelcule TRIF mice were completely protected from dsRNA-induced IEC apoptosis, villus shortening, and diarrhea. dsRNA-induced apoptosis was independent of TNF signaling. Notably, NF-κB signaling through IκB kinase β protected crypt IECs but did not protect villus IECs from dsRNA-induced or TNF-induced apoptosis. dsRNA did not induce early caspase 3 activation with subsequent villus shortening in mice lacking caspase 8 in IECs but instead caused villus destruction with a loss of small intestinal surface epithelium and death. Consistent with direct activation of the TLR3-TRIF-caspase 8 signaling pathway by dsRNA in IECs, dsRNA-induced signaling of apoptosis was independent of non-TLR3 dsRNA signaling pathways, IL-15, TNF, IL-1, IL-6, IFN regulatory factor 3, type I IFN receptor, adaptive immunity, as well as dendritic cells, NK cells, and other hematopoietic cells. We conclude that dsRNA activation of the TLR3-TRIF-caspase 8 signaling pathway in IECs has a significant impact on the structure and function of the small intestinal mucosa and suggest signaling through this pathway has a host protective role during infection with viral pathogens.

Original languageEnglish (US)
Pages (from-to)418-427
Number of pages10
JournalJournal of Immunology
Volume190
Issue number1
DOIs
StatePublished - Jan 1 2013

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Double-Stranded RNA
Caspase 8
Cell Survival
Cell Death
Epithelial Cells
Apoptosis
Intestinal Mucosa
Caspase 3
Diarrhea
Interferon Regulatory Factor-3
Interleukin-15
Adaptive Immunity
Virus Diseases
Interleukin-1
Natural Killer Cells
Dendritic Cells
Interleukin-6
Phosphotransferases
Viruses
Injections

ASJC Scopus subject areas

  • Immunology

Cite this

McAllister, C. S., Lakhdari, O., De Chambrun, G. P., Gareau, M., Broquet, A., Lee, G. H., ... Kagnoff, M. F. (2013). TLR3, TRIF, and caspase 8 determine double-stranded RNA-induced epithelial cell death and survival in vivo. Journal of Immunology, 190(1), 418-427. https://doi.org/10.4049/jimmunol.1202756

TLR3, TRIF, and caspase 8 determine double-stranded RNA-induced epithelial cell death and survival in vivo. / McAllister, Christopher S.; Lakhdari, Omar; De Chambrun, Guillaume Pineton; Gareau, Melanie; Broquet, Alexis; Lee, Gin Hyug; Shenouda, Steven; Eckmann, Lars; Kagnoff, Martin F.

In: Journal of Immunology, Vol. 190, No. 1, 01.01.2013, p. 418-427.

Research output: Contribution to journalArticle

McAllister, CS, Lakhdari, O, De Chambrun, GP, Gareau, M, Broquet, A, Lee, GH, Shenouda, S, Eckmann, L & Kagnoff, MF 2013, 'TLR3, TRIF, and caspase 8 determine double-stranded RNA-induced epithelial cell death and survival in vivo', Journal of Immunology, vol. 190, no. 1, pp. 418-427. https://doi.org/10.4049/jimmunol.1202756
McAllister, Christopher S. ; Lakhdari, Omar ; De Chambrun, Guillaume Pineton ; Gareau, Melanie ; Broquet, Alexis ; Lee, Gin Hyug ; Shenouda, Steven ; Eckmann, Lars ; Kagnoff, Martin F. / TLR3, TRIF, and caspase 8 determine double-stranded RNA-induced epithelial cell death and survival in vivo. In: Journal of Immunology. 2013 ; Vol. 190, No. 1. pp. 418-427.
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AU - Gareau, Melanie

AU - Broquet, Alexis

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