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Related Experiment Videos

Alveolar tissue inflammation in asthma

M Kraft1, R Djukanovic, S Wilson

  • 1Department of Medicine, National Jewish Center for Immunology and Respiratory Medicine, Denver, Colorado, USA.

American Journal of Respiratory and Critical Care Medicine
|November 1, 1996
PubMed
Summary

Asthma patients show increased eosinophils and macrophages in alveolar tissue, particularly at night. This inflammation in the lung

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Area of Science:

  • Pulmonary Medicine
  • Respiratory Research
  • Inflammation Biology

Background:

  • Asthma pathophysiology involves peripheral airways and lung parenchyma.
  • Previous studies suggest inflammation extends beyond proximal airways.

Purpose of the Study:

  • To investigate alveolar tissue inflammation in stable, chronic asthma.
  • To compare inflammation in nocturnal asthma (NA) versus non-nocturnal asthma (NNA).
  • To assess the relationship between inflammation and lung function decline.

Main Methods:

  • Bronchoscopy with endobronchial and transbronchial biopsies in 11 NA and 10 NNA patients.
  • Biopsies performed at 4:00 PM and 4:00 AM.
  • Morphometric analysis to quantify inflammatory cell numbers per volume (Nv).

Main Results:

  • Significantly higher eosinophil counts in NA alveolar tissue at 4:00 AM compared to NNA.
  • Greater accumulation of eosinophils and macrophages in NA alveolar tissue at 4:00 AM versus 4:00 PM.
  • Alveolar eosinophils, not airway eosinophils, correlated with nocturnal lung function decline.

Conclusions:

  • Alveolar tissue inflammation, particularly by eosinophils and macrophages, is prominent in nocturnal asthma.
  • This distal lung inflammation significantly contributes to nocturnal asthma symptoms and lung function variations.
  • Findings highlight the importance of targeting peripheral lung inflammation in asthma management.

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