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• W2891006191 abstract "Airway neutrophils are abundant in some children with severe asthma, but their functions are poorly understood.To characterize that the inflammatory airway environment of children with neutrophil-predominant severe asthma promotes neutrophil survival and disrupts neutrophil-associated innate immune defenses.Sixty-seven children with severe asthma refractory to high-dose inhaled corticosteroid treatment undergoing bronchoscopy with bronchoalveolar lavage (BAL) for clinical indications were stratified into neutrophil high versus low groups on the basis of BAL differential counts. Neutrophil activation markers, functional assays, and phenotyping studies were performed, as well as airway macrophage functional assays. Results were compared with those from children with moderate asthma treated with inhaled corticosteroids.Children with neutrophil-predominant severe asthma had increased markers of neutrophil activation/degranulation and a greater magnitude of airway proinflammatory cytokine and chemokine release. Primary neutrophils exposed to BAL of these children exhibited greater phagocytic capability and greater neutrophil extracellular trap formation, but a more impaired respiratory burst. Despite greater abundance of airway TGF-β1, the neutrophils were not more apoptotic. Instead, neutrophils had a highly proinflammatory phenotype associated with a number of surface markers that regulate neutrophil activation, recruitment/migration, and granule release. Airway macrophages from children with neutrophil-predominant severe asthma were also more proinflammatory with impaired phagocytosis and increased apoptosis.Children with neutrophil-predominant severe asthma have proinflammatory neutrophils with enhanced survival. Airway macrophages are also proinflammatory and dysfunctional and may contribute to global innate immune impairment. Therapies that target neutrophils and related inflammation may be warranted in this subset of children." @default.
• W2891006191 created "2018-09-27" @default.
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• W2891006191 date "2019-02-01" @default.
• W2891006191 modified "2023-10-17" @default.
• W2891006191 title "Children with Neutrophil-Predominant Severe Asthma Have Proinflammatory Neutrophils With Enhanced Survival and Impaired Clearance" @default.
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• W2891006191 doi "https://doi.org/10.1016/j.jaip.2018.08.024" @default.
• W2891006191 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6363859" @default.
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