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- W4313368426 abstract "Abstract Allergic asthma is a chronic intermittent inflammatory lung disease where patients experience relatively few symptoms between exacerbations precipitated by allergen-challenge of allergic memory responses. Allergen-specific CD4+ T cells are believed to be a major mediator of allergic memory responses through the production of type 2 cytokines including IL-4, IL-5, IL-13 and IL-9. Recently, tissue-resident memory (Trm) cells have been identified in peripheral tissues that mediate mucosal barrier immunity. However, the precise role of Trm CD4+ T cells in allergic exacerbations is not clearly defined. In studies to examine the role of IL-9 in allergen-specific Trm responses to Aspergillus fumigatus we observed that all IL-9-secreting T cells had a resident memory phenotype. Inhibition of circulating T cells by administering FTY720 in the last month of rest, diminished the total CD4 T cells population in the lung, while the Th9 cells remained stable. Blockade of IL-9 prior to recall challenge phase reduced overall allergic lung inflammation as assessed both by flow cytometry and single cell RNA-seq. Within eight hours after challenge, IL-9 is one of the top genes identified by scRNA-seq that distinguishes ST2+ and ST2− CD4+ T cell populations in the lung. Using IL-9-reporter mice we also compared gene expression in isolated IL-9+ T cells and other type 2 T cells. These findings demonstrate that IL-9-producing Trms play an important role in mediating allergic memory responses. IL-9 could be a promising therapeutic target specifically in patients showing symptoms of intermittent allergic response." @default.
- W4313368426 created "2023-01-06" @default.
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- W4313368426 date "2020-05-01" @default.
- W4313368426 modified "2023-10-16" @default.
- W4313368426 title "A single cell approach to identify the role of IL-9 secreting tissue-resident CD4+ T cells in allergic airway recall responses" @default.
- W4313368426 doi "https://doi.org/10.4049/jimmunol.204.supp.65.7" @default.
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