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 Resjournal_title
Pharmacological researchauthors
Obradović DI,Savić MM,Andjelković DS,Ugresić ND,Bokonjić DRdoi
10.1016/s1043-6618(02)00289-xkeywords:
subject
Has Abstractpub_date
2003-02-01 00:00:00pages
127-31issue
2eissn
1043-6618issn
1096-1186pii
S104366180200289Xjournal_volume
47pub_type
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