Mast cell exosomes can suppress allergic reactions by binding to IgE

来源 :2017上海市医学会变态反应学术年会 | 被引量 : 0次 | 上传用户:kevin_fisker
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  Background:IgE is the central macromolecular mediator responsible for the progression of allergic reactions.High-affinity IgE receptors(FcεRI)may possibly be transferred outside of mast cells(MCs)via exosomes.The aim of this study is to determine whether exosomes derived from MCs have the potential as anti-IgE agent by in vitro and in vivo experiments.Objective:We tested the hypothesis that exosomes derived from MCs could bind to free IgE,exerting a protective effect against allergic asthma.Methods:Exosomes were isolated from mouse bone marrow-derived mast cells(BMMCs)and the presence of the FcεRI in exosomes was examined by Western blot.Flow cytometry and degranulation assay were used to detect the combination of IgE to BMMCs after incubation of IgE with exosomes.Mouse asthma model was then developed to observe the effect of BMMC exosomes in vivo.Results:Exosomes derived from MCs expressed FcεRI and could bind to free IgE,which reduced IgE levels and subsequently inhibited mast cell activation through PLCγ1-PKC signalling pathway.In mouse model of allergic asthma,treatment with BMMC exosomes significantly reduced the levels of serum OVA-sIgE and histamine、interleukin(IL)-4、IL-5、IL-13 and inflammatory cells in BALF,although the levels of IL-10 and IFN-γ raised at the same time.Moreover,BMMC exosomes inhibited the development of AHR,airway inflammation and airway remodeling.Conclusion:Our studies demonstrate BMMC exosomes have the potential to be developed as a novel anti-IgE agent.
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