ATG16L1 orchestrates interleukin-22 signaling in the intestinal epithelium via cGAS-STING
A coding variant of the inflammatory bowel disease (IBD) risk gene ATG16L1 has been associated with defective autophagy and deregulation of endoplasmic reticulum (ER) function. IL-22 is a barrier protective cytokine by inducing regeneration and antimicrobial responses in the intestinal mucosa. We show that ATG16L1 critically orchestrates IL-22 signaling in the intestinal epithelium. IL-22 stimulation physiologically leads to transient ER stress and subsequent activation of STING-dependent type I interferon (IFN-I) signaling, which is augmented in Atg16l1IEC intestinal organoids. IFN-I signals amplify epithelial TNF production downstream of IL-22 and contribute to necroptotic cell death. In vivo, IL-22 treatment in Atg16l1IEC and Atg16l1IEC/Xbp1IEC mice potentiates endogenous ileal inflammation and causes widespread necroptotic epithelial cell death. Therapeutic blockade of IFN-I signaling ameliorates IL-22–induced ileal inflammation in Atg16l1IEC mice. Our data demonstrate an unexpected role of ATG16L1 in coordinating the outcome of IL-22 signaling in the intestinal epithelium.
Source: The Journal of Experimental Medicine - Category: Internal Medicine Authors: Aden, K., Tran, F., Ito, G., Sheibani-Tezerji, R., Lipinski, S., Kuiper, J. W., Tschurtschenthaler, M., Saveljeva, S., Bhattacharyya, J., Häsler, R., Bartsch, K., Luzius, A., Jentzsch, M., Falk-Paulsen, M., Stengel, S. T., Welz, L., Schwarzer, R., Tags: Innate Immunity and Inflammation, Mucosal Immunology Articles Source Type: research
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