Gamma-aminobutyric acid type A receptor alpha-5 beta-3 gamma-2 (GABA_A receptor alpha5beta3gamma2)

The Gamma-aminobutyric acid type A receptor alpha-5 beta-3 gamma-2 is a specific heteropentameric subtype of the ionotropic GABA receptor, primarily localized in the hippocampus and cerebral cortex [1][2]. It consists of two alpha-5 subunits, two beta-3 subunits, and one gamma-2 subunit, forming a chloride-selective ion channel that mediates both phasic (synaptic) and tonic (extrasynaptic) inhibitory neurotransmission [1][5]. This receptor subtype plays a critical role in modulating synaptic plasticity, learning, and memory, making it a high-priority target for cognitive enhancement [2][7]. Dysregulation of alpha-5-containing receptors is implicated in various neurological and psychiatric conditions, including Alzheimer's disease, Down syndrome, schizophrenia, and autism spectrum disorders [7][10]. Pharmacological targeting typically involves negative allosteric modulators (NAMs) to improve cognitive function or positive allosteric modulators (PAMs) for potential antidepressant or anxiolytic effects [5][12]. Unlike non-selective GABA_A modulators, alpha-5-selective agents aim to provide therapeutic benefits with reduced sedative and pro-convulsant side effects [1][7].

Other names

GABRA5/GABRB3/GABRG2 complexalpha5-containing GABA_A receptoralpha5-GABAARGABA(A) receptor alpha5beta3gamma2

Allosteric modulation of the GABA-A receptor chloride channel, acting as either a positive allosteric modulator (PAM) to enhance inhibitory chloride conductance or a negative allosteric modulator (NAM) to reduce it [1][2].