The influence of midazolam and flumazenil on rat brain slices oxygen consumption.

Abstract:

:This study investigated the impact of benzodiazepine receptor agonist, midazolam and antagonist, flumazenil, on the rat frontal cortex slices oxygen consumption (QO(2)), in presence and absence of gamma-aminobutyric acid (GABA). QO(2) was polarographically determined, using the biological oxygen monitor. As it was previously shown, GABA on its own decreases QO(2) moderately. Midazolam decreased QO(2) at 1.0mg/kg, whereas flumazenil had no effect. In combination with per se ineffective GABA (10(-6)mol/l), flumazenil showed respiratory depressant action, presumably revealing partial agonistic activity at some of GABA(A) receptor subtypes. However, it completely antagonized effects of midazolam on QO(2), on its own and in presence of GABA. Our results show that in vivo well-established effects of midazolam on cerebral metabolic activity could be reproduced in in vitro settings. Moreover, flumazenil antagonized this action, indicating the role of GABA(A)-benzodiazepine receptor complex activation in QO(2) regulation.

journal_name

Pharmacol Res

journal_title

Pharmacological research

authors

Obradović DI,Savić MM,Andjelković DS,Ugresić ND,Bokonjić DR

doi

10.1016/s1043-6618(02)00289-x

keywords:

subject

Has Abstract

pub_date

2003-02-01 00:00:00

pages

127-31

issue

2

eissn

1043-6618

issn

1096-1186

pii

S104366180200289X

journal_volume

47

pub_type

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