Pediatric severe asthma with fungal sensitization is mediated by steroid-resistant IL-33

The Journal of Allergy and Clinical Immunology
Susana CastanhinhaSejal Saglani

Abstract

The mechanism underlying severe asthma with fungal sensitization (SAFS) is unknown. IL-33 is important in fungus-induced asthma exacerbations, but its role in fungal sensitization is unexplored. We sought to determine whether fungal sensitization in children with severe therapy-resistant asthma is mediated by IL-33. Eighty-two children (median age, 11.7 years; 63% male) with severe therapy-resistant asthma were included. SAFS (n = 38) was defined as specific IgE or skin prick test response positivity to Aspergillus fumigatus, Alternaria alternata, or Cladosporium herbarum. Clinical features and airway immunopathology were assessed. Chronic exposure to house dust mite and A alternata were compared in a neonatal mouse model. Children with SAFS had earlier symptom onset (0.5 vs 1.5 years, P = .006), higher total IgE levels (637 vs 177 IU/mL, P = .002), and nonfungal inhalant allergen-specific IgE. Significantly more children with SAFS were prescribed maintenance oral steroids (42% vs 14%, P = .02). SAFS was associated with higher airway IL-33 levels. In neonatal mice A alternata exposure induced higher serum IgE levels, pulmonary IL-33 levels, and IL-13(+) innate lymphoid cell (ILC) and TH2 cell numbers but similar airway hyperres...Continue Reading

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Methods Mentioned

BETA
biopsy
ELISAs

Software Mentioned

ImageJ
FlowJo
GraphPad Prism
GraphPad

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