Gut bacteria metabolite butyrate imprints lasting anti-inflammatory memory in intestinal cells

In a study published in Nature Communications, scientists from Northwestern Medicine demonstrated that the fiber-derived short-chain fatty acid butyrate leaves a durable molecular imprint on intestinal epithelial cells. Mice given butyrate in their drinking water maintained higher levels of the anti-inflammatory cytokine IL-10 in CD4⁺ T-cells for at least two weeks after the supplement was withdrawn, and they suffered less weight loss and tissue damage in a colitis model.

The protective effect was observed even in germ-free mice, showing it is independent of the resident microbiota. Laboratory work revealed that butyrate-treated epithelial cells secrete factors that boost IL-10 production, with metabolomic analysis identifying N1-acetylspermidine as a key mediator linked to activation of the enzyme Sat1. The authors propose that epithelial cells can retain a long-lasting record of beneficial microbial signals, opening new avenues for treating inflammatory bowel disease. Future work will test whether the butyrate-Sat1-N1-acetylspermidine pathway operates similarly in human patients.