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Allergic rhinitis (AR) is a common upper airway allergic disease caused by allergens triggering a type 2 immune response. The imbalance of CD4+ T cell subsets is the essential immunological feature of AR, which is mainly characterized by the predominance of T helper (Th) 2 cells. Recent studies indicated that the anti-inflammatory factor interleukin (IL)-37 is involved in the immune regulation of AR. However, the mechanism of IL-37 acts on AR has not been fully elucidated. Thus, we sought to assess the protective role of IL-37 in AR and further explore the possible mechanism. An ovalbumin (OVA)-induced AR murine model was established. After IL-37 treatment, the allergic symptoms (sneezes and nasal rubbings), nasal mucosal infiltration with eosinophils, and serum IgE production were found significantly attenuated. For CD4+ T cell subsets, the proliferation and differentiation of Th2 and Th17 cells were restrained. The relevant effector cytokines of IL-4, IL-5, IL-6, and IL-17a protein expression and transcription factors GATA3 and RORγt mRNA levels were obviously decreased. However, IL-37 had no significant effect on Th1 and Treg response including in IFN-γ, IL-10, T-bet, and Foxp3 expression. Furthermore, IL-37 was found down-regulated the STAT6, STAT3, phospho-STAT6, and phospho-STAT3 expression. In conclusion, IL-37 alleviates allergic inflammation in AR possibly through repressing STAT6 and STAT3 signaling pathways.
This article was published in the following journal.
Name: International immunopharmacology
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