ATG16L1 orchestrates interleukin-22 signaling in the intestinal epithelium via cGAS-STING.

Authors:
Konrad Aden, Florian Tran, Go Ito, Raheleh Sheibani-Tezerji, Simone Lipinski, Jan W Kuiper, Markus Tschurtschenthaler, Svetlana Saveljeva, Joya Bhattacharyya, Robert Häsler, Kareen Bartsch, Anne Luzius, Marlene Jentzsch, Maren Falk-Paulsen, Stephanie T Stengel, Lina Welz, Robin Schwarzer, Björn Rabe, Winfried Barchet, Stefan Krautwald, Gunther Hartmann, Manolis Pasparakis, Richard S Blumberg, Stefan Schreiber, Arthur Kaser, Philip Rosenstiel
Year of publication:
2018
Volume:
-
Issue:
-
Issn:
0022-1007
Journal title abbreviated:
J EXP MED
Journal title long:
The journal of experimental medicine
Impact factor:
10.892
Abstract:
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 Atg16l1 ΔIEC 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 Atg16l1 ΔIEC and Atg16l1 ΔIEC/Xbp1 ΔIEC 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 Atg16l1 ΔIEC mice. Our data demonstrate an unexpected role of ATG16L1 in coordinating the outcome of IL-22 signaling in the intestinal epithelium.