Barbiturate-benzodiazepine interactions at the gamma-aminobutyric acidA receptor in rat cerebral cortical synaptoneurosomes.

Abstract:

:Combinations of benzodiazepines (midazolam and diazepam) with barbiturates (pentobarbital and phenobarbital) exhibit synergistic (supra-additive) hypnotic interactions in rats. Because both benzodiazepines and barbiturates interact with the gamma-aminobutyric acidA (GABAA) receptor complex, we have tested the hypothesis that these supra-additive hypnotic interactions are due to a synergistic effect on Cl- conductance subsequent to binding at allosterically coupled sites on the GABAA receptor ionophore complex. Equilibrium binding and 36Cl- flux measurements were performed under nearly identical conditions using rat brain cerebrocortical synaptoneurosomes. The benzodiazepines and barbiturates alone both allosterically enhance binding of [3H]muscimol to comparable, but modest, extents (range = 18%-32% enhancement). Isobolographic analysis reveals that combinations of benzodiazepines and barbiturates do in fact produce a synergistic enhancement of [3H]muscimol binding. Paradoxically, this effect is not translated into a synergistic enhancement of muscimol-stimulated 36Cl- flux. Because the positively cooperative interactions between benzodiazepines and barbiturates, as demonstrated both behaviorally and by binding measurements, are not reflected in enhanced Cl- conductance, the mechanistic basis for hypnotic synergism may involve other non-GABAergic components.

journal_name

Anesth Analg

journal_title

Anesthesia and analgesia

authors

DeLorey TM,Kissin I,Brown P,Brown GB

doi

10.1213/00000539-199309000-00030

subject

Has Abstract

pub_date

1993-09-01 00:00:00

pages

598-605

issue

3

eissn

0003-2999

issn

1526-7598

journal_volume

77

pub_type

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