Gamma-aminobutyric acid type A receptor alpha-2 beta-3 gamma-2 (GABA_A receptor α2β3γ2)

The Gamma-aminobutyric acid type A receptor alpha-2 beta-3 gamma-2 (GABA_A receptor α2β3γ2) is a heteropentameric ligand-gated ion channel that serves as a primary mediator of fast inhibitory neurotransmission in the central nervous system [1, 6]. It is typically composed of two α2, two β3, and one γ2 subunits arranged around a central chloride-conducting pore [1, 5]. Upon binding of the neurotransmitter GABA, the channel opens to allow chloride influx, leading to neuronal hyperpolarization and reduced excitability [12, 14]. This specific subtype is predominantly localized at postsynaptic sites and is particularly noted for mediating the anxiolytic, antihyperalgesic, and muscle-relaxant effects of benzodiazepines, distinguishing it from the α1-containing receptors which are more associated with sedation [3, 4]. Dysregulation or genetic variants of the α2, β3, or γ2 subunits are implicated in various neuropsychiatric conditions, including generalized anxiety disorder, epilepsy, schizophrenia, and chronic pain [3, 17]. Consequently, this receptor is a major therapeutic target for drugs such as benzodiazepines, barbiturates, and general anesthetics, which act as positive allosteric modulators to enhance GABAergic inhibition [1, 6]. Current drug development efforts are focused on identifying α2-selective modulators to provide therapeutic benefits for anxiety and pain while minimizing common side effects like sedation and ataxia [3, 8].

Other names

GABA(A) receptor alpha-2/beta-3/gamma-2α2β3γ2 GABA-A receptorGABRA2-GABRB3-GABRG2 complexGABA(A) receptor subunit alpha-2/beta-3/gamma-2

Positive allosteric modulation of the GABA-A receptor, which increases the frequency or duration of chloride channel opening in response to GABA, leading to neuronal hyperpolarization and reduced excitability [1, 14].