Christoph Schneider, Claire E O'Leary, Jakob von Moltke, Hong-Erh Liang, Qi Yan Ang, Peter J Turnbaugh, Sridhar Radhakrishnan, Michael Pellizzon, Averil Ma, Richard M Locksley
The small intestinal tuft cell-ILC2 circuit mediates epithelial responses to intestinal helminths and protists by tuft cell chemosensory-like sensing and IL-25-mediated activation of lamina propria ILC2s. Small intestine ILC2s constitutively express the IL-25 receptor, which is negatively regulated by A20 (Tnfaip3). A20 deficiency in ILC2s spontaneously triggers the circuit and, unexpectedly, promotes adaptive small-intestinal lengthening and remodeling. Circuit activation occurs upon weaning and is enabled by dietary polysaccharides that render mice permissive for Tritrichomonas colonization, resulting in luminal accumulation of acetate and succinate, metabolites of the protist hydrogenosome...
July 12, 2018: Cell