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The enigmatic role of IL-38 in inflammatory diseases

Abstract : IL-38 is the most recently discovered cytokine of the IL-1 family and is considered a potential inhibitor of the IL-1 and Toll-like receptor families. IL-38 exerts anti-inflammatory properties, especially on macrophages, by inhibiting secretion of pro-inflammatory cytokines, leading to reduced T-lymphocyte TH17 maturation. IL-38 has been studied most extensively in the context of chronic inflammatory diseases, particularly arthritis, where it is considered an attractive new drug candidate. IL-38 research has entered a new phase, with the realization that IL-38 is important in the pathophysiology of TH17 dependent-diseases (psoriasis, psoriatic arthritis and anky-losing spondylitis). In this review, we provide a critical evaluation of several controversial issues concerning IL-38 function and regulation. There is effectively contrasting data regarding IL-38: it is produced in conditions such as apoptosis, necrosis or inflammation, but data is lacking regarding IL-38 processing and biological function. Furthermore, the receptor for IL-38 has yet to be identified, although three candidate receptors – IL-1R1, IL-36R and IL-1RAPL1–have been proposed. Future studies will hopefully uncover new aspects of this enigmatic cytokine.
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Submitted on : Tuesday, January 30, 2018 - 4:14:35 PM
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Thomas Garraud, Mathilde Harel, Marie-Astrid Boutet, Benoit Le Goff, Frédéric Blanchard. The enigmatic role of IL-38 in inflammatory diseases. Cytokine and Growth Factor Reviews, Elsevier, 2018, Epub ahead of print. ⟨10.1016/j.cytogfr.2018.01.001⟩. ⟨inserm-01696801⟩



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