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Diazepam effects on local cortical neural activity during sleep in mice
Laura E McKillop1, Simon P Fisher1, Linus Milinski1
1Department of Physiology, Anatomy and Genetics, University of Oxford/Sleep and Circadian Neuroscience Institute, United Kingdom.
Biochemical Pharmacology
|March 13, 2021
Summary
Benzodiazepines like diazepam reduce sleep slow wave amplitude by disrupting cortical neuron synchronization, leading to shorter silent periods. This suggests a distinct brain state from natural sleep.
Area of Science:
- Neuroscience
- Sleep Science
- Pharmacology
Background:
- GABA-ergic neurotransmission is crucial for sleep regulation and brain oscillations.
- Benzodiazepines (e.g., diazepam) induce sedation but reduce EEG slow-frequency power.
- The precise mechanism of benzodiazepine action on cortical activity during sleep remains unclear.
Purpose of the Study:
- To investigate how benzodiazepines affect cortical neural activity during sleep.
- To elucidate the impact of diazepam on sleep slow waves and neuronal firing patterns.
Main Methods:
- Chronic recordings of local field potentials (LFP) and multiunit activity (MUA) in mouse motor cortex.
- Administration of diazepam to freely behaving mice.
- Analysis of LFP slow wave amplitude and neuronal OFF period characteristics.
Main Results:
- Diazepam significantly reduced the amplitude of LFP slow waves.
- A lower incidence and duration of neuronal OFF periods were observed post-diazepam.
- Findings suggest disrupted cortical neuron synchronization underlies these effects.
Conclusions:
- Benzodiazepine-induced sleep is qualitatively different from spontaneous physiological sleep.
- Global sleep state and local cortical synchrony can be dissociated.
- Diazepam disrupts the synchronized cortical activity underlying natural sleep slow waves.
