IL-36R signalling activates intestinal epithelial cells and fibroblasts and promotes mucosal healing in vivo

Gut
Kristina ScheibeClemens Neufert

Abstract

Interleukin (IL)-36R signalling plays a proinflammatory role in different organs including the skin, but the expression of IL-36R ligands and their molecular function in intestinal inflammation are largely unknown. We studied the characteristics of IL-36R ligand expression in IBDs and experimental colitis. The functional role of IL-36R signalling in the intestine was addressed in experimental colitis and wound healing models in vivo by using mice with defective IL-36R signalling (IL-36R-/-) or Myd88, neutralising anti-IL-36R antibodies, recombinant IL-36R ligands and RNA-seq genome expression analysis. Expression of IL-36α and IL-36γ was significantly elevated in active human IBD and experimental colitis. While IL-36γ was predominantly detected in nuclei of the intestinal epithelium, IL-36α was mainly found in the cytoplasm of CD14+ inflammatory macrophages. Functional studies showed that defective IL-36R signalling causes high susceptibility to acute dextran sodium sulfate colitis and impairs wound healing. Mechanistically, IL-36R ligands released upon mucosal damage activated IL-36R+ colonic fibroblasts via Myd88 thereby inducing expression of chemokines, granulocyte-macrophage colony-stimulating factor (GM-CSF) and IL-6. Mor...Continue Reading

Citations

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