IL-22 initiates an IL-18-dependent epithelial response circuit to enforce intestinal host defence.

ABSTRACT: IL-18 is emerging as an IL-22-induced and epithelium-derived cytokine which contributes to host defence against intestinal infection and inflammation. In contrast to its known role in Goblet cells, regulation of barrier function at the molecular level by IL-18 is much less explored. Here we show that IL-18 is a bona fide IL-22-regulated gate keeper for intestinal epithelial barrier. IL-22 promotes crypt immunity both via induction of phospho-Stat3 binding to the Il-18 gene promoter and via Il-18 independent mechanisms. In organoid culture, while IL-22 primarily increases organoid size and inhibits expression of stem cell genes, IL-18 preferentially promotes organoid budding and induces signature genes of Lgr5⁺ stem cells via Akt-Tcf4 signalling. During adherent-invasive E. coli

SUBMITTER: Chiang HY 

PROVIDER: S-EPMC8847568 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature