IL-33 promotes an innate immune pathway of intestinal tissue protection dependent on amphiregulin-EGFR interactions

Laurel A. Monticelli, Lisa C. Osborne, Mario Noti, Sara V. Tran, Dietmar M W Zaiss, David Artis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The barrier surfaces of the skin, lung, and intestine are constantly exposed to environmental stimuli that can result in inflammation and tissue damage. Interleukin (IL)-33-dependent group 2 innate lymphoid cells (ILC2s) are enriched at barrier surfaces and have been implicated in promoting inflammation; however, the mechanisms underlying the tissue-protective roles of IL-33 or ILC2s at surfaces such as the intestine remain poorly defined. Here we demonstrate that, following activation with IL-33, expression of the growth factor amphiregulin (AREG) is a dominant functional signature of gut-associated ILC2s. In the context of a murine model of intestinal damage and inflammation, the frequency and number of AREG-expressing ILC2s increases following intestinal injury and genetic disruption of the endogenous AREG-epidermal growth factor receptor (EGFR) pathway exacerbated disease. Administration of exogenous AREG limited intestinal inflammation and decreased disease severity in both lymphocyte-sufficient and lymphocyte-deficient mice, revealing a previously unrecognized innate immune mechanism of intestinal tissue protection. Furthermore, treatment with IL-33 or transfer of ILC2s ameliorated intestinal disease severity in an AREG-dependent manner. Collectively, these data reveal a critical feedback loop in which cytokine cues from damaged epithelia activate innate immune cells to express growth factors essential for ILC-dependent restoration of epithelial barrier function and maintenance of tissue homeostasis.

Original languageEnglish
Pages (from-to)10762-10767
Number of pages6
JournalProceedings of the National Academy of Sciences
Volume112
Issue number34
Early online date4 Aug 2015
DOIs
Publication statusPublished - 25 Aug 2015

Keywords

  • inflammatory bowel disease
  • innate immunity
  • innate lymphoid cell
  • interleukin-33

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