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• W2019261370 abstract "Benzodiazepine drugs (BZ) are used for anxiety, insomnia, and seizures. They worsen memory, especially in large doses, but the mechanism of this action is uncertain. In micromolar concentrations, benzodiazepines have been shown to reduce long-term potentiation (LTP), which could be a cellular basis for their amnesic action. We have found that the LTP-inhibiting effects of BZ occur in the nanomolar concentrations attained in humans, and that this effect occurs through modulation of GABAA receptor function. We recorded extracellular synaptic input/output (I/O) curves for population spikes (PS) and EPSPs in rat hippocampal slices before and after induction of LTP. LTP increased maximal PS and EPSPs and shifted I/O curves for PS and EPSPs to the left, reflecting increased synaptic responsiveness after LTP. Curves relating EPSPs to PS were also shifted, so that after LTP larger PS were elicited for the same size EPSP (E-S potentiation). Midazolam (0.5 microM) markedly inhibited the left-shift in PS I/O curves due to E-S potentiation but did not significantly affect other parameters. 8-Phenyltheophylline (10 microM), an adenosine receptor antagonist, did not prevent midazolam inhibition of LTP. Bicuculline, a GABAA receptor antagonist, caused a dose-dependent antagonism of midazolam's LTP inhibition. Our results suggest that benzodiazepines reduce LTP primarily through reduction of E-S potentiation, and that this effect occurs through modulation of GABAA receptor function. This could in part account for the ability of benzodiazepines to disturb new memory formation." @default.
• W2019261370 created "2016-06-24" @default.
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• W2019261370 date "1996-03-01" @default.
• W2019261370 modified "2023-09-27" @default.
• W2019261370 title "Midazolam inhibits long-term potentiation through modulation of GABAA receptors" @default.
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• W2019261370 doi "https://doi.org/10.1016/0028-3908(95)00182-4" @default.
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