Gamma-aminobutyric acid type A receptor alpha-2 beta-2 gamma-2S subtype (GABA_A receptor α2β2γ2S)

The GABA_A receptor α2β2γ2S subtype is a pentameric ligand-gated chloride channel that serves as a primary mediator of fast inhibitory neurotransmission in the central nervous system [1, 2]. It is typically composed of two α2, two β2, and one γ2S (short splice variant) subunits, forming a central pore that opens upon the binding of the neurotransmitter gamma-aminobutyric acid (GABA) [1, 5]. This specific subtype is highly expressed in brain regions such as the amygdala and hippocampus, where it plays a critical role in modulating emotional states, anxiety, and the brain's reward system [6, 11]. Pharmacologically, it is a major target for benzodiazepines, which act as positive allosteric modulators at the α/γ subunit interface to enhance GABAergic inhibition [4, 9]. Dysregulation or genetic variations of this receptor are linked to various neuropsychiatric conditions, including generalized anxiety disorder, epilepsy, and chronic pain [11, 12]. Consequently, it is a significant focus for the development of subtype-selective therapies aimed at providing anxiolytic and anticonvulsant effects with reduced sedative side effects compared to non-selective modulators [12, 13].

Other names

GABA(A) receptor alpha2beta2gamma2SGABRA2-GABRB2-GABRG2S complexAlpha-2 beta-2 gamma-2S GABA-A receptorIonotropic GABA receptor alpha2beta2gamma2S

Positive allosteric modulation of the chloride channel in response to GABA binding, increasing the frequency or duration of channel opening to induce membrane hyperpolarization.