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Endogenous nitric oxide required for an integrative respiratory function in the cat brain
L Ling1, D R Karius, R R Fiscus
1Department of Physiology, University of Kentucky, Lexington 40536-0084.
Journal of Neurophysiology
|November 1, 1992
Summary
Nitric oxide (NO) plays a key role in respiratory control. This study shows endogenous NO formation in the pontine respiratory group regulates breathing rhythm generation.
Area of Science:
- Neuroscience
- Respiratory Physiology
Background:
- The pontine respiratory group (PRG) is crucial for regulating respiratory rhythm.
- The role of nitric oxide (NO) in PRG function remains unclear.
Purpose of the Study:
- To investigate the involvement of endogenous nitric oxide (NO) in the respiratory control mechanisms of the pons.
Main Methods:
- Microinjections of NO synthase inhibitors (L-NNA) and substrates (L-arginine) into the PRG of decerebrate cats.
- Assessment of respiratory function, specifically inspiratory duration, following microinjections.
Main Results:
- Inhibition of NO synthase with L-NNA significantly prolonged inspiratory duration.
- The inactive enantiomer D-NNA had no effect on inspiratory duration.
- Administration of L-arginine partially reversed the effects of L-NNA.
Conclusions:
- Endogenous nitric oxide (NO) produced from L-arginine in the PRG is involved in the normal function of the pontine pneumotaxic mechanism.
- This study provides the first conclusive evidence for NO's role in respiratory rhythm generation.