Differential Effects of Anti-IL-1R Accessory Protein Antibodies on IL-1α or IL-1β-induced Production of PGE2 and IL-6 from 3T3-L1 Cells

  • Yoon, Do-Young (Laboratory of Cell and Immunobiochemistry, Department of Bioscience and Biotechnology, Konkuk University) ;
  • Dinarello, Charles A. (Department of Medicine, Division of Infectious Diseases, Univ. Colorado Health Sciences Center)
  • Published : 2007.07.31


Soluble or cell-bound IL-1 receptor accessory protein (IL-1RAcP) does not bind IL-1 but rather forms a complex with IL-1 and IL-1 receptor type I (IL-1RI) resulting in signal transduction. Synthetic peptides to various regions in the Ig-like domains of IL-1RAcP were used to produce antibodies and these antibodies were affinity-purified using the respective antigens. An anti-peptide-4 antibody which targets domain III inhibited 70% of IL-$1\beta$-induced productions of IL-6 and PGE2 from 3T3-L1 cells. Anti-peptide-2 or 3 also inhibited IL-1-induced IL-6 production by 30%. However, antipeptide-1 which is directed against domain I had no effect. The antibody was more effective against IL-$1\beta$ compared to IL-$1\alpha$. IL-1-induced IL-6 production was augmented by coincubation with PGE2. The COX inhibitor ibuprofen blocked IL-1-induced IL-6 and PGE2 production. These results confirm that IL-1RAcP is essential for IL-1 signaling and that increased production of IL-6 by IL-1 needs the co-induction of PGE2. However, the effect of PGE2 is independent of expressions of IL-1RI and IL-1RAcP. Our data suggest that domain III of IL-1RAcP may be involved in the formation or stabilization of the IL-1RI/IL-1 complex by binding to epitopes on domain III of the IL-1RI created following IL-1 binding to the IL-1RI.


Cyclooxygenase;Cytokines;IL-1;IL-1RAcP;Iglike domain;Inflammation


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