Allergic asthma is a chronic inflammatory disease of the lung and the airway,which is characterized by aberrant type 2 immune responses to otherwise unharmful aeroallergens.While the central role of Th2 cells and type...Allergic asthma is a chronic inflammatory disease of the lung and the airway,which is characterized by aberrant type 2 immune responses to otherwise unharmful aeroallergens.While the central role of Th2 cells and type 2 cytokines in the pathogenesis of allergic asthma is well documented,the regulation and plasticity of Th2 cells remain incompletely understood.By using an animal model of allergic asthma in IL-4-reporter mice,we found that Th2 cells in the lung expressed higher levels of Rora than those in the lymph nodes,and that treatment with an RORa agonist SRI 078 resulted in diminished Th2 cell responses in vivo.To determine the T cell-intrinsic role of RORa in allergic asthma in vivo,we established T cell-specific RORa-deficient^(f/f)fyf(Cd4creRora^(f/f))mice.Upon intranasal allergen challenges,Cd4creRora^(f/f)mice exhibited a significantly increased Th2 cells in the lungs and the airway and showed an enhanced eosinophilic inflammation compared to littermate control mice.Studies with Foxp3^(YFP-cre)Rora^(f/f)mice and CD^(8+)T cell depletion showed that the increased Th2 cell responses in the Cd4creRora^(f/f)mice were independent of Treg cells and CD^(8+)T cells.Our findings demonstrate a critical regulatory role of RORa in Th2 cells,which suggest that RORa agonists could be effective for the treatment of allergic diseases.展开更多
基金supported by a research grant 2017R1A2B3007392(YC)from the National Research Foundation of Korea(NRF).
文摘Allergic asthma is a chronic inflammatory disease of the lung and the airway,which is characterized by aberrant type 2 immune responses to otherwise unharmful aeroallergens.While the central role of Th2 cells and type 2 cytokines in the pathogenesis of allergic asthma is well documented,the regulation and plasticity of Th2 cells remain incompletely understood.By using an animal model of allergic asthma in IL-4-reporter mice,we found that Th2 cells in the lung expressed higher levels of Rora than those in the lymph nodes,and that treatment with an RORa agonist SRI 078 resulted in diminished Th2 cell responses in vivo.To determine the T cell-intrinsic role of RORa in allergic asthma in vivo,we established T cell-specific RORa-deficient^(f/f)fyf(Cd4creRora^(f/f))mice.Upon intranasal allergen challenges,Cd4creRora^(f/f)mice exhibited a significantly increased Th2 cells in the lungs and the airway and showed an enhanced eosinophilic inflammation compared to littermate control mice.Studies with Foxp3^(YFP-cre)Rora^(f/f)mice and CD^(8+)T cell depletion showed that the increased Th2 cell responses in the Cd4creRora^(f/f)mice were independent of Treg cells and CD^(8+)T cells.Our findings demonstrate a critical regulatory role of RORa in Th2 cells,which suggest that RORa agonists could be effective for the treatment of allergic diseases.
