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Bronchoalveolar lavage in asthmatic children: evidence of neutrophil activation in mild-to-moderate persistent asthma
A Barbato1, C Panizzolo, M Gheno
1Department of Pediatrics, University of Catania, Catania, Italy. barbato@child.pedi.unipd.it
Insights
Childhood asthma involves higher levels of neutrophils and inflammatory mediators like eosinophil cationic protein (ECP) and myeloperoxidase (MPO) in lower airways. More severe asthma correlates with increased neutrophil-driven inflammation.
Area of Science:
- Pediatric Pulmonology
- Allergy and Immunology
- Respiratory Medicine
Background:
- Limited data exists on lower airway cell profiles and mediator production in pediatric asthma compared to adults.
- Understanding these differences is crucial for accurate diagnosis and treatment of childhood asthma.
Purpose of the Study:
- To investigate bronchoalveolar lavage (BAL) cell profiles and mediator production (eosinophil cationic protein [ECP] and myeloperoxidase [MPO]) in children with asthma.
- To compare these findings between asthmatic children and healthy controls, and between different asthma severity levels.
Main Methods:
- Retrospective analysis of bronchoalveolar lavage (BAL) samples from 29 children (13 with allergic asthma, 16 controls).
- Comparison of total cell count, neutrophil count, ECP, and MPO levels between asthmatic children and controls.
- Analysis of differences based on asthma severity (mild-to-moderate persistent vs. intermittent).
Main Results:
- Asthmatic children showed significantly higher total cell counts, neutrophil counts, ECP, and MPO levels compared to controls.
- Patients with mild-to-moderate persistent asthma had higher MPO, neutrophil counts, and ECP values than those with intermittent asthma.
- Neutrophil-mediated inflammation was more pronounced in children with more severe asthma.
Conclusions:
- Childhood asthma is characterized by increased neutrophil activity and inflammatory mediators in the lower airways.
- Asthma severity in children is associated with the degree of neutrophil-mediated inflammation.
- These findings highlight the role of neutrophils in pediatric asthma pathogenesis.
Abstract:
Little information is available on cell profiles and mediator production in the lower airways of children with asthma by comparison with the adult population. To study the bronchoalveolar lavage (BAL) cell profiles and production of eosinophil cationic protein (ECP) and myeloperoxidase (MPO) in childhood bronchial asthma, a retrospective study was performed in 29 children (13 allergic asthmatic children and 16 controls). Six of the asthmatics had mild-to-moderate persistent disease and seven had intermittent asthma. The BAL cell count and ECP and MPO values of asthmatic children were compared with those from 16 controls. The asthmatic patients had higher values than controls for the total cell count (p = 0.08), for neutrophils (p = 0.02), and for ECP and MPO (p < 0.001). MPO levels (p = 0.04), neutrophil count (p = 0.06), and ECP values (p = 0.06) were higher in patients with mild-to-moderate persistent asthma than in those with intermittent asthma. Our results demonstrate that neutrophil-mediated inflammation is greater in patients with more severe asthma.