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Gamma-aminobutyric acid type A receptor benzodiazepine site (GABAA receptor benzodiazepine site)

Target: GABAA receptor benzodiazepine site
Molecular classification: Receptor, Ligand-gated ion channel subunit interface, Allosteric binding site

Overview

The benzodiazepine binding site is an allosteric modulatory site on the GABAA receptor, located at the interface between an alpha (α1/2/3/5) and a gamma (γ2) subunit. Binding of benzodiazepines to this site enhances the effect of GABA, the primary inhibitory neurotransmitter in the brain, leading to increased chloride ion influx and neuronal inhibition. This results in sedative, anxiolytic, anticonvulsant, and muscle relaxant effects. GABAA receptors containing α4 or α6 subunits are generally insensitive to benzodiazepines.

Other names: Benzodiazepine receptorBDZ receptorBZ receptorGABAA-BZ receptorGABAA receptor benzodiazepine binding site

Mechanism of action

Positive allosteric modulation of the GABAA receptor, increasing the frequency of chloride channel opening in the presence of GABA.

Biological functions

Modulation of GABAergic neurotransmissionRegulation of neuronal excitabilityChloride ion influxSynaptic inhibition

Disease associations

Anxiety disordersInsomniaSeizuresEpilepsyMuscle spasticity

Safety considerations

ToleranceDependenceWithdrawal symptomsRespiratory depressionCognitive impairmentAnterograde amnesiaParadoxical reactions (e.g., agitation, aggression)Drug interactions (e.g., with alcohol, opioids)Risk of falls, especially in elderly patients

Interacting drugs

Diazepam

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