Gamma-aminobutyric acid type A receptor alpha3beta3gamma2 (GABA_A receptor α3β3γ2)

The Gamma-aminobutyric acid type A receptor alpha3beta3gamma2 (GABA_A receptor α3β3γ2) is a heteropentameric ligand-gated ion channel that serves as a primary mediator of fast inhibitory neurotransmission in the mammalian central nervous system [2, 4]. It is composed of two α3 subunits, two β3 subunits, and one γ2 subunit, which together form a chloride-selective pore [1, 5]. This specific receptor subtype is prominently expressed in brain regions such as the thalamus, amygdala, and the dorsal horn of the spinal cord, where it regulates neuronal excitability related to emotional processing and sensory perception [6, 11]. Dysregulation of α3-containing GABA_A receptors is implicated in the pathophysiology of generalized anxiety disorder, chronic pain, and epilepsy [4, 13]. Pharmacologically, these receptors are the targets of benzodiazepines and other allosteric modulators that enhance the inhibitory effects of the endogenous neurotransmitter GABA [1, 9]. Current drug development efforts focus on identifying α3-selective positive allosteric modulators to achieve anxiolytic and analgesic effects while minimizing the sedation and motor impairment typically associated with non-selective GABA_A receptor activation [1, 10].

Other names

GABA(A) receptor alpha3beta3gamma2GABRA3/GABRB3/GABRG2 receptorAlpha3-containing GABA-A receptorGABA-A receptor subunit alpha-3/beta-3/gamma-2

Positive allosteric modulation of the GABA-A receptor, typically at the interface between the alpha and gamma subunits (benzodiazepine site) or the alpha and beta subunits (GABA site), which increases the frequency or duration of chloride channel opening in response to GABA.