Gut epithelial IL-27 confers intestinal immunity through the induction of intraepithelial lymphocytes

Chia Hao Lin, Mei Chi Chen, Ling Li Lin, David A. Christian, Booki Min, Christopher A. Hunter, Li Fan Lu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


IL-27 controls a diverse range of immune responses in many disease settings. Here, we identify intestinal epithelial cells (IECs) as one of the major IL-27 cellular sources in the gut-associated tissue. Unlike IL-27 secreted by innate immune cells, gut epithelial IL-27 is dispensable for T-bet+ regulatory T cell (T reg cell) differentiation or IL-10 induction. Rather, IEC-derived IL-27 specifically promotes a distinct CD8αα+CD4+ intraepithelial lymphocyte (IEL) population that acquires their functional differentiation at the intestinal epithelium. Loss of IL-27 in IECs leads to a selective defect in CD8αα+CD4+ IELs over time. Consequently, mice with IEC-specific IL-27 ablation exhibited elevated pathogen burden during parasitic infection, and this could be rescued by transfer of exogenous CD8αα+CD4+ IELs. Collectively, our data reveal that in addition to its known regulatory properties in preventing immune hyperactivity, gut epithelial IL-27 confers barrier immunity by inducing a specific IEL subset and further suggest that IL-27 produced by different cell types plays distinct roles in maintaining intestinal homeostasis.

Original languageEnglish (US)
Article numbere20210021
JournalJournal of Experimental Medicine
Issue number11
StatePublished - Sep 23 2021

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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