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Nitric oxide and airway disease

P J Barnes1

  • 1Department of Thoracic Medicine, National Heart and Lung Institute, London, UK.

Annals of Medicine
|June 1, 1995
PubMed
Summary

Nitric oxide (NO) regulates airway function and inflammation. Increased NO production in airways, linked to inducible NO synthase (iNOS), contributes to diseases like asthma, suggesting iNOS inhibitors as future treatments.

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Area of Science:

  • Respiratory Medicine
  • Immunology
  • Molecular Biology

Background:

  • Nitric oxide (NO) is crucial for airway function and inflammatory airway diseases.
  • Endothelium-derived NO influences airway blood flow and plasma exudation.
  • NO acts as a bronchodilator neurotransmitter, opposing cholinergic bronchoconstriction.

Purpose of the Study:

  • To explore the role of nitric oxide (NO) in airway physiology and pathology.
  • To investigate the expression and regulation of inducible NO synthase (iNOS) in inflammatory airway conditions.
  • To assess the therapeutic potential of targeting NO pathways in airway diseases.

Main Methods:

  • Review of existing literature on NO, iNOS, and inflammatory airway diseases.
  • Analysis of NO synthase expression in human airway epithelial cells and lung macrophages.
  • Evaluation of the effects of pro-inflammatory stimuli and glucocorticoids on iNOS expression and NO production.

Main Results:

  • Inducible NO synthase (iNOS) is upregulated in airway epithelium of asthmatics and macrophages in bronchiectasis.
  • Increased airway NO production is associated with hyperaemia, plasma exudation, mucus secretion, and Th2 inflammation.
  • Glucocorticoids effectively inhibit iNOS induction and normalize exhaled NO levels.

Conclusions:

  • Elevated iNOS expression and NO production contribute to the pathophysiology of inflammatory airway diseases.
  • Targeting iNOS with selective inhibitors may offer a future therapeutic strategy for conditions like asthma.
  • Modulating NO pathways holds promise for managing airway inflammation and hyperresponsiveness.

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