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Electrophysiology on Isolated Brainstem-spinal Cord Preparations from Newborn Rodents Allows Neural Respiratory Network Output Recording
Published on: November 19, 2015
Catecholamine neurones in rats modulate sleep, breathing, central chemoreception and breathing variability
1Department of Physiology, Dartmouth Medical School, Lebanon, NH 03756-0001, USA.
The Journal of Physiology
|October 29, 2005
Summary
Brainstem catecholamine (CA) neurons are crucial for regulating breathing and promoting wakefulness. Lesioning these neurons significantly reduced breathing rate and CO2 response, impacting sleep-wake cycles.
Area of Science:
- Neuroscience
- Respiratory Physiology
Background:
- Brainstem catecholamine (CA) neurons influence arousal and sensory processing.
- These neurons are implicated in respiratory control and may act as central chemoreceptors.
- Genetic defects affecting CA neurons cause abnormal respiratory control at birth.
Purpose of the Study:
- To investigate the role of CA neurons in controlling breathing during sleep and wakefulness.
- To determine the impact of CA neuron lesions on respiratory parameters and sleep architecture.
Main Methods:
- Selective lesioning of CA neurons using antidopamine beta-hydroxylase-saporin (DBH-SAP) via the 4th ventricle in rats.
- Assessment of tyrosine hydroxylase (TH) and phenyl ethanolamine-N-methyltransferase (PNMT) immunoreactive neuron loss.
- Monitoring of breathing frequency, ventilatory response to CO2, breathing variability, and sleep-wake states over 3 weeks.
Main Results:
- Significant loss (73-84%) of TH-ir neurons (A5, A6, A7) and (56-60%) of PNMT-ir neurons (C1, C2) was observed.
- Breathing frequency decreased significantly during air and CO2 exposure in both wakefulness and NREM sleep.
- Ventilatory response to 7% CO2 was reduced, wakefulness time decreased, and NREM sleep time increased.
- Breathing variability increased during REM sleep, but not during wakefulness or NREM sleep.
Conclusions:
- CA neurons promote wakefulness.
- CA neurons are essential for central respiratory chemoreception.
- CA neurons stimulate breathing frequency.
- CA neurons minimize breathing variability during REM sleep.
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