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Effect of increased pressure on tracheal ciliary beat frequency
J H Calvet1, F Verra, J Maleine
1Labratoire de Physiopathologie Respiratoire, Centre d'Etudes du Bouchet, Vert-le Petit, France.
The European Respiratory Journal
|September 18, 1999
Summary
Increased ambient pressure enhances mucociliary clearance by boosting ciliary beat frequency (CBF) in guinea-pig tracheal rings. This effect involves nitric oxide generation and is significant even at lower pressures.
Area of Science:
- Physiology
- Respiratory Science
- Environmental Health
Background:
- Mucociliary clearance is crucial for respiratory health, but the impact of elevated ambient pressure remains understudied.
- Understanding factors affecting ciliary function is vital for respiratory medicine and diving/aviation physiology.
Purpose of the Study:
- To investigate the effects of increased ambient pressure on ciliary beat frequency (CBF) in guinea-pig tracheal rings.
- To explore the potential role of nitric oxide in mediating pressure-induced changes in CBF.
Main Methods:
- In vitro study using guinea-pig tracheal rings.
- Measurement of CBF under varying ambient pressures (25, 50, 100 kPa).
- Pharmacological manipulation using N(G)-nitro-L-arginine methylester (L-NAME) and L-arginine.
Main Results:
- Increased ambient pressure (25 and 100 kPa) significantly enhanced CBF.
- A 50 kPa pressure increase yielded greater CBF enhancement than equivalent oxygen tension at atmospheric pressure.
- L-NAME inhibited the pressure-induced CBF enhancement, while L-arginine reversed this inhibition.
Conclusions:
- Elevated ambient pressure stimulates ciliary beat frequency in tracheal tissue.
- Nitric oxide generation appears to be a key mediator in this pressure-induced ciliary stimulation.
- Findings suggest a novel mechanism for pressure adaptation in the respiratory system.