Tuft-cell-derived IL-25 regulates an intestinal ILC2–epithelial response circuit

It is shown that tuft cells constitutively express IL-25 to sustain ILC2 homeostasis in the resting lamina propria in mice, and comprise a response circuit that mediates epithelial remodelling associated with type 2 immunity in the small intestine, and perhaps at other mucosal barriers populated by these cells.