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Difficult asthma in children: an analysis of airway inflammation

Jacques de Blic1, Isabelle Tillie-Leblond, André Bernard Tonnel

  • 1Service de Pneumologie et d'Allergologie Pédiatriques, Hôpital Necker-Enfants Malades, Paris, France.

The Journal of Allergy and Clinical Immunology
|January 10, 2004
PubMed

Insights

Difficult asthma in children shows different inflammatory profiles. Symptomatic children have more eosinophils and neutrophils, while those with fewer symptoms show higher T(H)1 cytokine levels.

Area of Science:

  • Pediatric Pulmonology
  • Immunology of Asthma
  • Respiratory Medicine

Background:

  • Difficult asthma in children presents unique clinical features.
  • The underlying physiopathology of difficult childhood asthma is not fully understood.

Purpose of the Study:

  • To characterize the bronchial inflammatory profile in pediatric patients with difficult asthma.
  • To differentiate inflammatory markers between symptomatic and asymptomatic difficult asthma cases in children.

Main Methods:

  • Endobronchial biopsy and bronchoalveolar lavage were performed on 28 children with difficult asthma.
  • Patients were categorized into two groups: 13 with persistent symptoms and 15 with few or no symptoms.
  • Analysis focused on cellular counts and cytokine levels, including Interferon-gamma (IFNγ) and Interleukin-4 (IL-4).

Main Results:

  • Symptomatic children exhibited significantly higher epithelial eosinophil and neutrophil counts.
  • Children with few symptoms showed significantly higher levels of IFNγ and a higher IFNγ/IL-4 ratio.
  • Reticular basement membrane thickening was comparable between the two groups.

Conclusions:

  • Pediatric difficult asthma with persistent symptoms is associated with T(H)2-type inflammation and activated eosinophils.
  • Asthma in children with fewer symptoms is linked to elevated T(H)1 cytokine levels, particularly IFNγ.
  • IFNγ may play a role in modulating local inflammatory responses in pediatric difficult asthma.
Abstract

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