Intestinal Phospholipid Disequilibrium Initiates an ER Stress Response That Drives Goblet Cell Necroptosis and Spontaneous Colitis in Mice
John P. Kennelly, Stephanie Carlin, Tingting Ju, Jelske N. van der Veen, Randal C. Nelson, Jean Buteau, Aducio Thiesen, Caroline Richard, Benjamin P. Willing, René L. Jacobs
Abstract
BACKGROUND & AIMS: mice). METHODS: mice and control mice were treated with dietary PC supplementation, antibiotics, or 4-phenylbutyrate. RESULTS: mice was traced to a severe and unresolving endoplasmic reticulum stress response in IECs with altered membrane phospholipid composition. This endoplasmic reticulum stress response was linked to the necroptotic death of IECs, leading to excessive loss of goblet cells, formation of a thin mucus barrier, increased intestinal permeability, and infiltration of the epithelium by microbes. CONCLUSIONS: Maintaining the PC content of IEC membranes protects against colitis development in mice, showing a crucial role for IEC phospholipid equilibrium in colonic homeostasis. SRA accession number: PRJNA562603.