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Sensory neuropeptides modulate cigarette smoke-induced decrease in neutral endopeptidase activity in guinea pig

H P Kuo1, L C Lu

  • 1Department of Thoracic Medicine, Chang Gung Memorial Hospital, Taipei, Taiwan.

Life Sciences
|January 1, 1995
PubMed
Summary
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Sensory neuropeptides may protect airways from cigarette smoke (CS) by modulating neuroepithelial body (NEB) activity. Pretreatment with capsaicin, which targets C-fibers, enhanced CS effects on airway inflammation and NEB function.

Area of Science:

  • Respiratory Physiology
  • Neuroscience
  • Pharmacology

Background:

  • Cigarette smoke (CS) inhalation triggers C-fibers, releasing neuropeptides that mediate airway reflexes.
  • Upper airway inhalation of CS may influence airway neuroepithelial body (NEB) activity and hyperresponsiveness.

Purpose of the Study:

  • To investigate the role of sensory neuropeptides in modulating CS effects on airway NEP activity and hyperresponsiveness.
  • To examine how upper airway CS exposure affects airway defense mechanisms.

Main Methods:

  • Guinea pigs were exposed to diluted CS for 7 days.
  • Pulmonary resistance to neurokinin A (NKA) and methacholine (Mch) was measured.
  • NEP activity in tracheobronchi was assessed via fluorometric assay.
  • Capsaicin pretreatment was used to modulate C-fiber activity.

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Main Results:

  • CS exposure alone did not alter dose-responses to NKA or Mch but slightly reduced NEP activity.
  • Capsaicin pretreatment shifted NKA dose-response curves leftward and further decreased NEP activity.
  • CS exposure increased airway neutrophil counts, an effect enhanced by capsaicin pretreatment.

Conclusions:

  • Sensory neuropeptides may play a protective role against CS-induced downregulation of airway NEP activity.
  • Mechanisms may involve preventing CS entry into lower airways or providing substrates for NEP upregulation.
  • These pathways could modify CS effects on NEP activity and airway hyperresponsiveness.