期刊
JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY
卷 129, 期 4, 页码 974-U469出版社
MOSBY-ELSEVIER
DOI: 10.1016/j.jaci.2012.01.059
关键词
Pediatric asthma; eosinophilia; remodeling; severe therapy-resistant asthma; mediators
资金
- Asthma UK Foundation
- Royal Brompton & Harefield Biomedical Research Unit
- Wellcome Trust, UK [083586/Z/07/Z]
- European Respiratory Society [64]
- Swiss National Science Foundation [1172/05b]
- NIHR Respiratory Disease Biomedical Research Unit at the Royal Brompton
- Harefield NHS Foundation Trust
- Imperial College London
- British Medical Association
- Asthma UK [10/058, 08/010] Funding Source: researchfish
- Medical Research Council [G1000758B, G1000758] Funding Source: researchfish
- National Institute for Health Research [NF-SI-0508-10212, NF-SI-0510-10192] Funding Source: researchfish
- Wellcome Trust [083586/Z/07/Z] Funding Source: Wellcome Trust
Background: The pathology of pediatric severe therapy-resistant asthma (STRA) is little understood. Objectives: We hypothesized that STRA in children is characterized by airway eosinophilia and mast cell inflammation and is driven by the T(H)2 cytokines IL-4, IL-5, and IL-13. Methods: Sixty-nine children (mean age, 11.8 years; interquartile range, 5.6-17.3 years; patients with STRA, n = 53; control subjects, n = 16) underwent fiberoptic bronchoscopy, bronchoalveolar lavage (BAL), and endobronchial biopsy. Airway inflammation, remodeling, and BAL fluid and biopsy specimen T(H)2 cytokines were quantified. Children with STRA also underwent symptom assessment (Asthma Control Test), spirometry, exhaled nitric oxide and induced sputum evaluation. Results: Children with STRA had significantly increased BAL fluid and biopsy specimen eosinophil counts compared with those found in control subjects (BAL fluid, P < .001; biopsy specimen, P < .01); within the STRA group, there was marked between-patient variability in eosinophilia. Submucosal mast cell, neutrophil, and lymphocyte counts were similar in both groups. Reticular basement membrane thickness and airway smooth muscle were increased in patients with STRA compared with those found in control subjects (P < .0001 and P < .001, respectively). There was no increase in BAL fluid IL-4, IL-5, or IL-13 levels in patients with STRA compared with control subjects, and these cytokines were rarely detected in induced sputum. Biopsy IL-5(+) and IL-13(+) cell counts were also not higher in patients with STRA compared with those seen in control subjects. The subgroup (n = 15) of children with STRA with detectable BAL fluid T(H)2 cytokines had significantly lower lung function than those with undetectable BAL fluid T(H)2 cytokines. Conclusions: STRA in children was characterized by remodeling and variable airway eosinophil counts. However, unlike in adults, there was no neutrophilia, and despite the wide range in eosinophil counts, the T(H)2 mediators that are thought to drive allergic asthma were mostly absent. (J Allergy Clin Immunol 2012;129:974-82.)
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