Epithelial-derived IL-23 promotes oral mucosal immunopathology
At mucosal surfaces, epithelial cells provide a structural barrier and an immune defense system. However, dysregulated epithelial responses can contribute to disease states. Here, we demonstrate that epithelial intrinsic production of IL-23 triggers an inflammatory loop in the prevalent oral disease, periodontitis.  Epithelial IL-23 expression localized to areas proximal to the disease-associated microbiome, is evident both in experimental models and in patients with common and genetic forms of disease. Mechanistically, flagellated microbial species of the periodontitis microbiome, trigger epithelial IL-23 induction in a TLR5-dependent manner. Intriguingly, unlike other Th17-driven diseases, here non-hematopoietic cell-derived IL-23 serves as an initiator of pathogenic inflammation.  Beyond periodontitis, analysis of publicly available datasets reveals expression of epithelial IL-23 in settings of infection, malignancy, and autoimmunity, suggesting a broader role for epithelial-intrinsic IL-23 in human disease.  Collectively, this work highlights an unappreciated role for the barrier epithelium in the induction of IL-23-mediated inflammation. Overall design: Examine the changes in the transcriptom in human oral mucosal tissues from Healthy controls, chronic pariodontiits and LAD1-periodontitis. contributor: NIDCD/NIDCR Genomics and Computational Biology Core