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

The Gamma-aminobutyric acid type A (GABA_A) receptor alpha-1 beta-2 gamma-2 is the most prevalent subtype of ionotropic GABA receptors in the mammalian central nervous system, accounting for approximately 60% of all GABA_A receptors [1, 13]. It is a heteropentameric ligand-gated ion channel composed of two alpha-1, two beta-2, and one gamma-2 subunits [1, 4]. This receptor mediates fast inhibitory synaptic transmission, known as phasic inhibition, by allowing chloride ions to flow into the postsynaptic neuron upon GABA binding [1, 8]. The resulting membrane hyperpolarization reduces neuronal excitability and prevents action potential generation [6, 11]. This subtype is a primary target for several classes of drugs, including benzodiazepines, barbiturates, and non-benzodiazepine hypnotics like zolpidem, which act as positive allosteric modulators [4, 9, 12]. These agents are widely used to treat insomnia, anxiety, and epilepsy due to their sedative, anxiolytic, and anticonvulsant effects [1, 2]. However, chronic use is associated with significant safety concerns such as pharmacological tolerance, physical dependence, and cognitive impairment [6, 13]. The alpha-1 subunit specifically is linked to the sedative and amnestic properties of these medications [4, 5].

Other names

GABRA1-GABRB2-GABRG2 complexBZ1 receptorBenzodiazepine receptor type 1alpha1-containing GABAA receptorGABA(A) receptor alpha1beta2gamma2

Positive allosteric modulation of the GABA_A receptor, which increases the frequency or duration of chloride channel opening in response to GABA binding, thereby enhancing inhibitory neurotransmission.