摘要：SummaryThe cytokine interleukin-3 (IL-3) acts on early hematopoietic precursor cells. In humans, Tregcells secrete IL-3 and repress inflammatory cells except for basophils. The present study aims to elucidate the contribution of IL-3 in the development and the course of allergic asthma. We therefore analyzed the secretion of IL-3 in PBMCs and total blood cells in two cohorts of pre-school children with and without asthma. In a murine model of allergic asthma, we analyzed the phenotype of IL-3−/−mice compared to wild-type mice. PBMCs from asthmatic children showed increased IL-3 secretion, which directly correlated with improved lung function. IL-3−/−asthmatic mice showed increased asthmatic traits. Moreover, IL-3-deficient mice had a defect in T regulatory cells in the lung. In conclusion, IL-3 downregulation was found associated with more severe allergic asthma in pre-school children. Consistently, targeting IL-3 resulted in an induced pathophysiological response in a murine model of allergic asthma.Graphical abstractDisplay OmittedHighlights•The cytokine interleukin-3 (IL-3) acts on early hematopoietic precursor cells•PHA-stimulated PBMCs from asthmatic children showed increased IL-3 secretion•IL-3 from PBMCs from asthmatic children correlated with improved lung function•Targeting IL-3 resulted in an induced pathophysiological response in asthma modelBiological sciences; Immunology; Immune response
