Gamma-aminobutyric acid type A receptor alpha 3 subunit-containing complex (GABA_A receptor α3βxγ2) (GABA_A receptor α3βxγ2)

The Gamma-aminobutyric acid type A (GABA_A) receptor α3βxγ2 is a subtype of the pentameric ligand-gated ion channel responsible for mediating fast inhibitory neurotransmission in the mammalian central nervous system (UniProt P34903). It is typically composed of two α3 subunits, two β subunits (β2 or β3), and one γ2 subunit, which together form a chloride-selective pore (PMID: 11689411). This receptor subtype is predominantly expressed in the thalamus, amygdala, and the dorsal horn of the spinal cord, where it plays a crucial role in modulating sensory input and emotional responses (PMID: 21606318). Dysregulation of α3-containing GABA_A receptors is implicated in the pathophysiology of chronic neuropathic pain, generalized anxiety disorders, and certain types of epilepsy (PMID: 15620363). Therapeutic targeting of this receptor involves positive allosteric modulators (PAMs) that bind to the benzodiazepine site at the α3/γ2 interface, enhancing the inhibitory effect of GABA (PubChem CID 3016). Unlike α1-containing receptors which mediate sedation, α3-containing receptors are primarily associated with anxiolytic and analgesic effects (PMID: 19012749). Consequently, drug discovery efforts are focused on developing α3-selective or α2/α3-preferring modulators to treat pain and anxiety while minimizing sedative side effects (PMID: 29351434). These receptors also interact with various endogenous neurosteroids and barbiturates, which further modulate their channel kinetics and inhibitory tone (StatPearls NBK526124).

Other names

α3-GABA_A receptorGABRA3-containing GABA_A receptorGABA(A) receptor alpha 3 beta gamma 2Alpha-3-containing GABA-A receptor

Positive allosteric modulation of the GABA_A receptor at the benzodiazepine binding site located at the α3/γ2 subunit interface, which increases the frequency of chloride channel opening in response to GABA binding, leading to neuronal hyperpolarization (PMID: 15620363, StatPearls NBK526124).