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Related Experiment Videos

Ciliostimulatory effects mediated by nitric oxide.

T Runer1, S Lindberg

  • 1Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital, Lund, Sweden.

Acta Oto-Laryngologica
|February 25, 2000
PubMed
Summary

Nitric oxide (NO) mediates ciliostimulation from transmitters but not cyclic nucleotides. This suggests NO is an intermediate messenger, but not the sole pathway for ciliary beat frequency (CBF) stimulation.

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Area of Science:

  • Respiratory Physiology
  • Cellular Signaling
  • Pharmacology

Background:

  • Ciliostimulation, crucial for mucociliary clearance, is thought to involve nitric oxide (NO) release.
  • Understanding the signaling pathways of ciliary beat frequency (CBF) modulation is vital for respiratory health.

Purpose of the Study:

  • To investigate the role of nitric oxide (NO) in mediating ciliostimulation induced by various transmitters and cyclic nucleotides.
  • To determine if NO is a required intermediate messenger for increasing ciliary beat frequency (CBF) in adenoid tissue.

Main Methods:

  • Adenoid tissue explants were pre-treated with N(G)-nitro L-arginine (L-NNA), a nitric oxide synthase (NOS) inhibitor.
  • The effect of L-NNA on CBF changes induced by terbutaline, methacholine, substance P, endothelin-1, dibutyryl cAMP, and dibutyryl cGMP was assessed in vitro.

Main Results:

  • L-NNA pre-treatment significantly altered the CBF response to transmitters like terbutaline and methacholine.
  • In contrast, L-NNA did not inhibit the ciliostimulatory effects of dibutyryl cAMP and dibutyryl cGMP on CBF.

Conclusions:

  • Nitric oxide (NO) acts as an intermediate messenger in the ciliated epithelium for certain transmitters.
  • NO-independent pathways, involving cyclic nucleotides like cAMP and cGMP, also contribute to ciliary function stimulation.

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