Related Experiment Videos
Respiratory depression produced by intravenously administered NBQX
J E McManigle1, R A Gillis, K L Dretchen
1Department of Pharmacology, Georgetown University School of Medicine, Washington, DC 20007, USA.
Pharmacology
|July 8, 1998
Summary
Blockade of non-N-methyl-D-aspartate (non-NMDA) receptors with NBQX significantly depresses breathing and cardiorespiratory activity in anesthetized cats. This research highlights the critical role of non-NMDA receptors in maintaining respiratory function.
Area of Science:
- Neuroscience
- Respiratory Physiology
Background:
- Non-N-methyl-D-aspartate (non-NMDA) receptors are crucial for excitatory neurotransmission in the central nervous system.
- The role of non-NMDA receptors in regulating cardiorespiratory function remains incompletely understood.
Purpose of the Study:
- To investigate the effects of non-NMDA receptor blockade on cardiorespiratory activity.
- To determine if the non-NMDA receptor antagonist NBQX influences breathing and associated physiological parameters.
Main Methods:
- Anesthetized cats were administered varying doses of NBQX (2,3-dihydroxy-6-nitro-7-sulfamoyl-benzo(F)quinoxaline).
- Phrenic nerve discharge, blood pressure, and heart rate were continuously monitored.
- Dose-dependent effects of NBQX on respiratory parameters were analyzed.
Main Results:
- NBQX administration resulted in significant reductions in phrenic nerve amplitude and respiratory rate.
- Higher doses of NBQX led to complete silencing of phrenic activity in some animals.
- NBQX also caused a decrease in blood pressure and heart rate, indicating cardiorespiratory depression.
Conclusions:
- NBQX, a competitive antagonist of non-NMDA receptors, acts as a potent depressant of cardiorespiratory activity.
- These findings underscore the importance of non-NMDA receptor signaling in the maintenance of breathing and overall cardiorespiratory homeostasis.