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Noninvasive Sampling of Mucosal Lining Fluid for the Quantification of In Vivo Upper Airway Immune-mediator Levels
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Impact of bacterial colonization on exhaled inflammatory markers in wheezing preschool children

Kim D G van de Kant1, Ester M M Klaassen, Koen J van Aerde

  • 1Department of Paediatric Pulmonology, School for Public Health and Primary Care (CAPHRI), Maastricht University Medical Centre (MUMC), PO Box 5800, 6202 AZ, Maastricht, The Netherlands. kim.vande.kant@mumc.nl

Journal of Breath Research
|September 20, 2012
PubMed

Insights

Preschool wheeze is linked to increased airway inflammation, indicated by elevated exhaled inflammatory markers. Bacterial presence and regulatory T cells did not significantly differ between wheezing and non-wheezing children, suggesting no bacterial link to inflammation.

Area of Science:

  • Pediatric Pulmonology
  • Immunology
  • Microbiology

Background:

  • Recurrent wheeze is common in preschoolers, but the roles of bacteria, regulatory T cells, and airway inflammation are not well understood.
  • Understanding these factors is crucial for early diagnosis and management of pediatric respiratory conditions.

Purpose of the Study:

  • To investigate the association between airway inflammation markers in exhaled breath condensate (EBC), bacterial colonization, and regulatory T cells in preschool children with recurrent wheeze.
  • To determine if bacterial presence influences airway inflammation or regulatory T cell proportions in wheezing children.

Main Methods:

  • Recruited 252 preschool children (2-4 years), with 202 experiencing recurrent wheeze and 50 serving as controls.
  • Assessed inflammatory markers (IL-2, IL-4, IL-8, IL-10, IL-13) in EBC using multiplex immunoassay.
  • Analyzed nasal/throat swabs for bacteria (Streptococcus pneumoniae, Haemophilus (para)influenzae, Staphylococcus aureus) and quantified regulatory T cells via flow cytometry.

Main Results:

  • Children with recurrent wheeze showed significantly elevated EBC levels of IL-2, IL-4, IL-10, and IL-13 compared to non-wheezers.
  • Bacterial colonization and regulatory T cell proportions did not differ significantly between wheezing and non-wheezing groups.
  • No significant differences in inflammatory markers or T cell proportions were observed between wheezing children with or without bacterial colonization.

Conclusions:

  • Elevated exhaled inflammatory markers in EBC suggest increased airway inflammation in preschool children with recurrent wheeze.
  • Exhaled breath condensate analysis is a promising non-invasive tool for assessing airway inflammation in young children.
  • Current findings do not support a role for bacterial-induced airway inflammation in preschool wheeze.

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