A necroptotic-to-apoptotic signaling axis underlies inflammatory bowel disease
Pang, J.; Al-Ani, A. H.; Patel, K. M.; Young, S. N.; Kong, I.; Chen, J.-j.; Barrios, M.; Rickard, J. A.; Chen, S.; Foroughi, S.; Cawthorne, W.; Jacobsen, A. V.; Jois, A.; Weir, A. L.; Whitehead, L. W.; Rajasekhar, P.; Horne, C. R.; Azeez, I.; Tan, T.; Liang, W.; Sivanesan, S.; Metz, A.; Patwardhan, A.; Shea, N.; Iyngkaran, G.; Schneider, D.; Elford, A. T.; Beattie, W.; Macrae, F.; Liccardi, G.; Walczak, H.; Zhang, Y.; Sieber, O. M.; Spelman, T.; Giulino-Roth, L.; Hawkins, E. D.; Rogers, K. L.; Bowden, R.; Nicholson, S. E.; Lawlor, K. E.; Christensen, B.; Samson, A. L.; Vince, J. E.; Murphy, J.
Show abstract
Inflammatory bowel disease (IBD) is a chronic condition caused by altered cytokine signaling, maladaptive immunity, dysbiosis, and intestinal barrier dysfunction. Patients with IBD receive therapy to correct these imbalances and achieve remission. However, most patients relapse, suggesting that pathological mechanisms persist during remission. Here, we show that excess epithelial cell death is an underlying feature of IBD that arises in patients in remission and on advanced therapy. Mechanistically, nascent inflammation reprograms epithelial cells into a macrophage-like state that promotes RIPK1-independent necroptotic signaling, then triggers iNOS-mediated mitochondrial apoptosis of absorptive epithelial cells and PUMA-mediated intestinal stem cell death. These findings reveal aberrant epithelial cell death signaling as a hallmark of IBD that occurs early in mucosal lesion development and persists despite current therapeutic approaches. One-Sentence SummaryEpithelial cell death is dysregulated in patients with inflammatory bowel disease.
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