Neutrophil infiltration in response to IL-33 is partially dependent on mast cell–derived TNF. (A) Percentage of Ly-6G⁺ neutrophils in wild-type C57BL/6 mice injected with IL-33 intraperitoneally in the presence of 10 μg anti-KC antibody or rat IgG2A isotype control (n = 5-6). (B) Percentage of Ly-6G⁺ neutrophils in W^sh/W^sh mice reconstituted with wild-type BMMCs and W^sh/W^sh mice reconstituted with TNF^−/− BMMCs and injected intraperitoneally with IL-33 (n = 7-12). (C) Percentage of mast cells in the peritoneum of W^sh/W^sh mice reconstituted with wild-type or TNF^−/− BMMCs (n = 7-12). Values are presented as mean ± SEM, *P < .05, ns = not significant.