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NOD1 mediates interleukin-18 processing in epithelial cells responding to Helicobacter pylori infection in mice

  • L. S. Tran
  • , L. Ying
  • , K. D’Costa
  • , G. Wray-McCann
  • , G. Kerr
  • , L. Le
  • , C. C. Allison
  • , J. Ferrand
  • , H. Chaudhry
  • , J. Emery
  • , A. De Paoli
  • , N. Colon
  • , S. Creed
  • , M. Kaparakis-Liaskos
  • , J. Como
  • , J. K. Dowling
  • , P. A. Johanesen
  • , T. A. Kufer
  • , J. S. Pedersen
  • , A. Mansell
  • D. J. Philpott, K. D. Elgass, H. E. Abud, U. Nachbur, B. A. Croker, S. L. Masters, R. L. Ferrero

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The interleukin-1 family members, IL-1β and IL-18, are processed into their biologically active forms by multi-protein complexes, known as inflammasomes. Although the inflammasome pathways that mediate IL-1β processing in myeloid cells have been defined, those involved in IL-18 processing, particularly in non-myeloid cells, are still not well understood. Here we report that the host defence molecule NOD1 regulates IL-18 processing in mouse epithelial cells in response to the mucosal pathogen, Helicobacter pylori. Specifically, NOD1 in epithelial cells mediates IL-18 processing and maturation via interactions with caspase-1, instead of the canonical inflammasome pathway involving RIPK2, NF-κB, NLRP3 and ASC. NOD1 activation and IL-18 then help maintain epithelial homoeostasis to mediate protection against pre-neoplastic changes induced by gastric H. pylori infection in vivo. Our findings thus demonstrate a function for NOD1 in epithelial cell production of bioactive IL-18 and protection against H. pylori-induced pathology.

Original languageEnglish
Article number3804
Number of pages18
JournalNature Communications
Volume14
Issue number1
DOIs
Publication statusPublished - Dec 2023

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