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Allergic airway inflammation: unravelling the relationship between IL-37, IL-18Rα and Tir8/SIGIRR

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* This paper demonstrates the inflammatory potential of SIGIRR in an in vivo mouse model.

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** This paper introduced the term interleukin-37 and describes its function as fundamental inhibitor of innate immunity for the first time.

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  • Li S, Neff CP, Barber K, et al. Extracellular forms of IL-37 inhibit innate inflammation in vitro and in vivo but require the IL-1 family decoy receptor IL-1R8. Proc Natl Acad Sci U S A. 2015;112(8):2497–2502.
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  • Moretti S, Bozza S, Oikonomou V, et al. IL-37 inhibits inflammasome activation and disease severity in murine aspergillosis. PLoS Pathog. 2014;10(11):e1004462.

* This paper focuses on the inhibiting influence of IL-37 on the proinflammatory inflammasome in mice.

  • Li Y, Wang Z, Yu T, et al. Increased expression of IL-37 in patients with Graves’ disease and its contribution to suppression of proinflammatory cytokines production in peripheral blood mononuclear cells. PloS One. 2014;9(9):e107183.
  • Raedler D, Ballenberger N, Klucker E, et al. Identification of novel immune phenotypes for allergic and nonallergic childhood asthma. J Allergy Clin Immunol. 2015;135(1):81–91.
  • Lunding L, Webering S, Vock C, et al. IL-37 requires IL-18Rα and SIGIRR/IL-1R8 to diminish allergic airway inflammation in mice. Allergy. 2015;70(4):366–373.

** This paper described the anti-inflammatory potential of IL-37 in a mouse model of allergic inflammation. Furthermore, this paper showed for the first time that this mode of action requires IL18Rα and SIGIRR.

  • Nold-Petry CA, Lo CY, Rudloff I, et al. IL-37 requires the receptors IL-18Rα and IL-1R8 (SIGIRR) to carry out its multifaceted anti-inflammatory program upon innate signal transduction. Nat Immunol. 2015;16(4):354–365.

**This excellent paper clarifies the intracellular effects of IL-37 binding to the IL18Rα/SIGIRR receptor complex.

  • Ye L, Ji L, Wen Z, et al. IL-37 inhibits the production of inflammatory cytokines in peripheral blood mononuclear cells of patients with systemic lupus erythematosus: its correlation with disease activity. J Transl Med. 2014;12:69.
  • Imaeda H, Takahashi K, Fujimoto T, et al. Epithelial expression of interleukin-37b in inflammatory bowel disease. Clin Exp Immunol. 2013;172(3):410–416.

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