Gamma-aminobutyric acid type A receptor alpha-1 beta-2 gamma-2 subtype (GABA-A receptor α1β2γ2) (GABA-A receptor α1β2γ2)

The Gamma-aminobutyric acid type A receptor alpha-1 beta-2 gamma-2 subtype (GABA-A receptor α1β2γ2) is the most abundant inhibitory neurotransmitter receptor in the adult mammalian brain, primarily mediating fast synaptic inhibition (Olsen & Sieghart, 2008). It is a heteropentameric ligand-gated ion channel that facilitates the influx of chloride ions upon activation by GABA, resulting in hyperpolarization of the postsynaptic neuron (Sigel & Steinmann, 2012). This specific subtype is highly concentrated in the cerebral cortex, hippocampus, and cerebellum, where it plays a critical role in regulating neuronal excitability and rhythmic activity (Rudolph & Möhler, 2014). The α1-containing receptors are specifically associated with the sedative, hypnotic, and anticonvulsant effects of benzodiazepines, as well as the amnestic properties of these drugs (Rudolph & Knoflach, 2011). Clinically, this receptor is the primary target for a wide range of CNS depressants, including benzodiazepines, non-benzodiazepine "Z-drugs" like zolpidem, and certain general anesthetics (StatPearls, 2023). Dysfunction or altered expression of this subtype is linked to various neurological disorders such as epilepsy, insomnia, and chronic anxiety (Jacob et al., 2008).

Other names

GABAA receptor alpha1beta2gamma2BZ1 receptorOmega-1 receptorGABRA1/GABRB2/GABRG2 complexBenzodiazepine receptor type 1

Positive allosteric modulation of the GABA-A receptor, which increases the frequency of chloride channel opening in the presence of GABA, thereby enhancing inhibitory neurotransmission.