Gamma-aminobutyric acid type A receptor alpha-5 subunit-containing subtypes (GABA_A receptor α5)

The GABA_A receptor α5-containing subtype is a specific class of ionotropic gamma-aminobutyric acid receptors characterized by the presence of the α5 subunit (GABRA5). These receptors are primarily localized extrasynaptically in the hippocampus and cerebral cortex, where they mediate tonic inhibition—a continuous, low-level inhibitory conductance that regulates the overall excitability of neurons [2, 5]. This tonic inhibition plays a critical role in sculpting synaptic plasticity and is essential for cognitive processes such as learning and memory [6, 10]. Dysregulation of α5-containing receptors is implicated in several neurological and psychiatric conditions; for instance, excessive tonic inhibition is associated with cognitive deficits in Alzheimer's disease, Down syndrome, and schizophrenia, while reduced receptor function is linked to autism spectrum disorders and epilepsy [2, 11]. Pharmacological targeting of this receptor involves negative allosteric modulators (NAMs) to enhance cognition by reducing tonic inhibition, and positive allosteric modulators (PAMs) which are being explored for their potential antidepressant and anxiolytic effects [12, 13].

Other names

GABRA5Gamma-aminobutyric acid receptor subunit alpha-5GABA(A) receptor subunit alpha-5Alpha5-GABA_A receptorEIEE79DEE79

Negative allosteric modulation (NAM), Positive allosteric modulation (PAM), and Competitive antagonism at the benzodiazepine binding site or GABA binding site.