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Neurogenic inflammation and asthma.

P J Barnes1

  • 1Department of Thoracic Medicine, National Heart and Lung Institute, Brompton Hospital, London, England.

The Journal of Asthma : Official Journal of the Association for the Care of Asthma
|January 1, 1992
PubMed
Summary

Neurogenic inflammation, driven by sensory nerve neuropeptides, may worsen asthma. Inhibiting neuropeptide release offers a potential therapeutic strategy for managing this inflammatory response in airways.

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Area of Science:

  • Neuroscience
  • Immunology
  • Respiratory Medicine

Background:

  • Neurotransmitters can intensify inflammatory responses, a phenomenon known as neurogenic inflammation.
  • This type of inflammation, mediated by neuropeptides from sensory nerves, is observed in various inflammatory conditions.
  • Neurogenic inflammation in the airways, particularly in rodents, is linked to asthma pathogenesis.

Purpose of the Study:

  • To explore the role of neurogenic inflammation in asthma.
  • To investigate the mechanisms by which neuropeptides contribute to airway inflammation.
  • To identify potential therapeutic targets for reducing neurogenic inflammation in asthma.

Main Methods:

  • Review of existing literature on neurogenic inflammation and asthma.
  • Analysis of neuropeptide functions (tachykinins, calcitonin gene-related peptide) in airway responses.
  • Discussion of factors exacerbating neurogenic inflammation, such as epithelial damage and enzyme loss.
  • Exploration of therapeutic strategies targeting sensory nerve pathways.

Main Results:

  • Airway sensory nerves release neuropeptides like substance P and neurokinin A, causing bronchoconstriction, vasodilation, plasma exudation, and mucus secretion.
  • Calcitonin gene-related peptide contributes to inflammatory hyperemia.
  • Airway epithelial damage in asthma sensitizes sensory nerves, leading to exaggerated neuropeptide release.
  • Loss of neutral endopeptidase can amplify tachykinin effects.

Conclusions:

  • Neurogenic inflammation is a potential contributor to airway inflammation in asthma, although direct evidence is pending.
  • Therapeutic strategies could involve inhibiting neuropeptide release from sensory nerves.
  • Stimulating prejunctional receptors, such as mu-opioid receptors, is a promising approach to reduce neurogenic inflammation.

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