IL-1 receptor accessory protein and ST2 comprise the IL-33 receptor complex.

Discovery Research, Schering-Plough Biopharma (formerly DNAX Research), Palo Alto, CA 94304, USA.
The Journal of Immunology (Impact Factor: 5.36). 09/2007; 179(4):2551-5. DOI: 10.4049/jimmunol.179.4.2551
Source: PubMed

ABSTRACT IL-33 (IL-1F11) is a recently described member of the IL-1 family of cytokines that stimulates the generation of cells, cytokines, and Igs characteristic of a type 2 immune response. IL-33 mediates signal transduction through ST2, a receptor expressed on Th2 and mast cells. In this study, we demonstrate that IL-33 and ST2 form a complex with IL-1R accessory protein (IL-1RAcP), a signaling receptor subunit that is also a member of the IL-1R complex. Additionally, IL-1RAcP is required for IL-33-induced in vivo effects, and IL-33-mediated signal transduction can be inhibited by dominant-negative IL-1RAcP. The implications of this shared usage of IL-1RAcP by IL-1(alpha and beta) and IL-33 are discussed.

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