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Differential depression of neuronal network activity by midazolam and its main metabolite 1-hydroxymidazolam in cultured neocortical slices.

Abstract：

:The benzodiazepine midazolam is widely used in critical care medicine. Midazolam has a clinically active metabolite, 1-hydroxymidazolam. The contribution of 1-hydroxymidazolam to the effects of midazolam is controversial. The aim of the current study was to compare the actions of midazolam and 1-hydroxymidazolam on network activity of cortical neurons. Midazolam depressed neuronal activity at a low concentration of 5 nM. When midazolam concentration was increased, it depressed neuronal discharge rates in a biphasic manner. In comparison, 1-hydroxymidazolam did not depress the cortical network activity at low nanomolar concentrations. Higher concentrations of 1-hydroxymidazolam consistently inhibited neuronal activity. Moreover, midazolam shortened cortical up states at low, but not at high concentrations, while the opposite effect was observed with 1-hydroxymidazolam. The network depressant action of midazolam at low concentrations was absent in slices from GABAA receptor α1(H101R)mutant mice. The α1(H101R)mutation renders α1-subunit containing GABAA receptors insensitive towards benzodiazepines. This GABAA receptor subtype is thought to mediate sedation. As midazolam is more potent than its metabolite 1-hydroxymidazolam, the major clinical effects are thus likely caused by midazolam itself. However, 1-hydroxymidazolam could add to the effects of midazolam, especially after the application of high doses of midazolam, and in case of impaired drug metabolism.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Balk M,Hentschke H,Rudolph U,Antkowiak B,Drexler B

doi

10.1038/s41598-017-03154-5

subject

Has Abstract

pub_date

2017-06-14 00:00:00

pages

3503

issue

1

issn

2045-2322

pii

10.1038/s41598-017-03154-5

journal_volume

7

pub_type

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