The IL-1 receptor accessory protein (AcP) is required for IL-33 signaling and soluble AcP enhances the ability of soluble ST2 to inhibit IL-33 - PubMed

A rare IL33 loss-of-function mutation reduces blood eosinophil counts and protects from asthma.

Smith D, Helgason H, Sulem P, Bjornsdottir US, Lim AC, Sveinbjornsson G, Hasegawa H, Brown M, Ketchem RR, Gavala M, Garrett L, Jonasdottir A, Jonasdottir A, Sigurdsson A, Magnusson OT, Eyjolfsson GI, Olafsson I, Onundarson PT, Sigurdardottir O, Gislason D, Gislason T, Ludviksson BR, Ludviksdottir D, Boezen HM, Heinzmann A, Krueger M, Porsbjerg C, Ahluwalia TS, Waage J, Backer V, Deichmann KA, Koppelman GH, Bønnelykke K, Bisgaard H, Masson G, Thorsteinsdottir U, Gudbjartsson DF, Johnston JA, Jonsdottir I, Stefansson K. Smith D, et al. PLoS Genet. 2017 Mar 8;13(3):e1006659. doi: 10.1371/journal.pgen.1006659. eCollection 2017 Mar. PLoS Genet. 2017. PMID: 28273074 Free PMC article.