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Related Experiment Videos

Inflammatory basis of exercise-induced bronchoconstriction.

Teal S Hallstrand1, Mark W Moody, Mark M Wurfel

  • 1Department of Medicine, Division of Pulmonary and Critical Care, University of Washington, Seattle, Washington 98195-6522, USA. tealh@u.washington.edu

American Journal of Respiratory and Critical Care Medicine
|June 11, 2005
PubMed
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Exercise-induced bronchoconstriction (EIB) involves airway inflammation with mast cell and epithelial cell activation. Medications targeting histamine and leukotrienes reduce inflammatory mediators but not epithelial cell release.

Area of Science:

  • Respiratory Medicine
  • Immunology
  • Exercise Physiology

Background:

  • Exercise-induced bronchoconstriction (EIB) is common, but its underlying inflammatory mechanisms remain debated.
  • Two main theories propose different inflammatory pathways contributing to EIB pathogenesis.

Purpose of the Study:

  • To determine if epithelial cell and mast cell activation occurs during EIB.
  • To investigate the effects of histamine and cysteinyl leukotriene antagonists on airway events in EIB.

Main Methods:

  • Induced sputum analysis in 25 asthma patients with EIB to measure mediators and eicosanoids.
  • A randomized, double-blind crossover study using montelukast, loratadine, or placebo before exercise challenge.

Main Results:

Related Experiment Videos

  • EIB severity correlated with baseline columnar epithelial cells in sputum.
  • Exercise increased airway histamine, tryptase, cysteinyl leukotrienes, and columnar epithelial cells, while decreasing PGE2 and TXB2.
  • Columnar epithelial cell levels were linked to histamine and cysteinyl leukotriene concentrations.
  • Montelukast and loratadine reduced cysteinyl leukotriene and histamine release but not epithelial cell release.

Conclusions:

  • Airway release of epithelial cells, mast cell mediators, and eicosanoids occurs during EIB.
  • These findings support an inflammatory basis for exercise-induced bronchoconstriction.