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[Airway autonomic nervous system dysfunction and asthma].

M Ichinose1

  • 1First Department of Internal Medicine, Tohoku University School of Medicine.

Nihon Kokyuki Gakkai Zasshi = the Journal of the Japanese Respiratory Society
|March 24, 1999
PubMed
Summary

Neural imbalances in asthma contribute to airway hyperresponsiveness. Targeting excitatory nonadrenergic noncholinergic (e-NANC) nerves with tachykinin receptor antagonists may offer new asthma therapies.

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Area of Science:

  • Neuroscience
  • Pulmonology
  • Immunology

Context:

  • Asthma involves airway inflammation and hyperresponsiveness.
  • Four major nervous systems innervate airways: adrenergic, cholinergic, inhibitory nonadrenergic noncholinergic (i-NANC), and excitatory NANC (e-NANC).
  • Dysfunction in these neural pathways is implicated in asthma pathogenesis.

Purpose:

  • To explore the role of airway nervous systems in asthma.
  • To understand how neural imbalances contribute to airway hyperresponsiveness.
  • To evaluate potential therapeutic targets within these neural pathways.

Summary:

  • The cholinergic system, a primary bronchoconstrictor, shows exaggerated acetylcholine release in asthma due to M2 muscarinic receptor dysfunction.
  • Inhibitory NANC nerves release vasoactive intestinal peptide (VIP) and nitric oxide (NO), which are bronchodilators but are diminished by allergic inflammation.
  • Excitatory NANC nerves release tachykinins, mediating smooth muscle contraction, mucus secretion, and vascular leakage, suggesting their involvement in asthma.
  • Tachykinin receptor antagonists show promise for treating bronchoconstriction in asthma.

Impact:

  • Understanding neural mechanisms in asthma can lead to novel therapeutic strategies.
  • Targeting specific neural pathways, like e-NANC nerves, may provide effective treatments for asthma symptoms.
  • This research highlights the complex interplay between neural regulation and inflammation in airway diseases.

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