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Eszopiclone and Zolpidem Produce Opposite Effects on Hippocampal Ripple Density
Logan A Becker1,2,3, Hector Penagos4,5, Francisco J Flores4,5,6
1Department of Neuroscience and Behavior, Stony Brook University, Stony Brook, NY, United States.
Frontiers in Pharmacology
|January 28, 2022
Summary
Eszopiclone and zolpidem differentially impact hippocampal ripples, affecting memory consolidation. Zolpidem increased ripple density and memory, while eszopiclone decreased ripples and spiking activity.
Area of Science:
- Neuroscience
- Sleep Science
- Pharmacology
Background:
- Memory deficits in clinical populations are linked to sleep oscillations.
- Non-benzodiazepine hypnotics like eszopiclone and zolpidem enhance sleep spindles.
- Previous studies show zolpidem improves sleep-dependent memory consolidation, but eszopiclone does not.
Purpose of the Study:
- To investigate the differential effects of eszopiclone and zolpidem on hippocampal ripples and neuronal activity.
- To explain the divergent impacts of these drugs on memory consolidation.
Main Methods:
- Extracellular recordings in the CA1 region of rat hippocampus.
- Systemic administration of eszopiclone and zolpidem.
- Analysis of hippocampal ripple oscillations and neuronal spike firing.
Main Results:
- Eszopiclone reduced hippocampal ripple density and significantly decreased neuronal firing in pyramidal cells and interneurons.
- Zolpidem increased hippocampal ripple density without substantially altering neuronal spiking.
- These distinct effects correlate with observed differences in memory consolidation in human studies.
Conclusions:
- Eszopiclone and zolpidem exert differential effects on hippocampal ripples and neuronal activity.
- These findings provide a neurophysiological basis for the differing effects of these hypnotics on memory.
- Sleep medications can potentially modulate hippocampal ripples for therapeutic benefit in memory consolidation.
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