Modulation of the benzodiazepine/gamma-aminobutyric acid receptor chloride channel complex by inhalation anesthetics.

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Moody EJ, Suzdak PD, Paul SM, Skolnick P

Modulation of the benzodiazepine/gamma-aminobutyric acid receptor chloride channel complex by inhalation anesthetics.

J Neurochem. 1988 Nov;51(5):1386-93.

PubMed ID

2459308 [ View in PubMed

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Abstract

Inhalation anesthetics, such as diethyl ether, halothane, and enflurane, increase 36Cl- uptake into rat cerebral cortical synaptoneurosomes in a concentration-dependent, picrotoxin-sensitive fashion. At concentrations consistent with those that stimulate 36Cl- uptake, inhalation anesthetics also inhibit the binding of t-[35S]butylbicyclophosphorothionate ([35S]TBPS) to well-washed cortical membranes. Scatchard analysis of [35S]TBPS binding indicates that these agents reduce the apparent affinity of this radioligand and have little effect on the Bmax. The ability of inhalation anesthetics to directly stimulate 36Cl- uptake and inhibit [35S]TBPS binding is a property shared by nonvolatile anesthetics. Nonetheless, there are differences between nonvolatile agents (such as barbiturates and alcohols) and inhalation anesthetics, because the former compounds augment muscimol (a GABAmimetic) stimulated 36Cl- uptake, whereas the latter group (such as ether and enflurane) inhibit this effect. These findings demonstrate that therapeutically relevant concentrations of inhalation anesthetics perturb the benzodiazepine/gamma-aminobutyric acid receptor chloride channel complex, and suggest this oligomeric protein may be a common mediator of some aspects of anesthetic action.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Methoxyflurane	Gamma-aminobutyric acid receptor subunit alpha-1	Protein	Humans	Yes	Agonist	Details