Gamma-aminobutyric acid type A receptor (GABAAR) (GABAAR)

The Gamma-aminobutyric acid type A (GABAA) receptor is a primary ligand-gated ion channel responsible for mediating fast inhibitory neurotransmission in the mammalian central nervous system (StatPearls, NBK526124). It is structured as a heteropentameric assembly of subunits that form a central chloride-permeable pore, which opens upon the binding of the inhibitory neurotransmitter GABA (UniProt, P14867). This influx of chloride ions leads to neuronal hyperpolarization, effectively reducing the likelihood of action potential generation and maintaining the excitatory-inhibitory balance in the brain (PubMed, 30103115). Because of its central role in neural signaling, the GABAA receptor is a major therapeutic target for a variety of clinical conditions, including epilepsy, anxiety disorders, and insomnia (PubMed, 24161214). Pharmacological agents such as benzodiazepines, barbiturates, and certain general anesthetics act as positive allosteric modulators to enhance GABA-mediated inhibition (PubChem, CID 119). Conversely, mutations or dysregulation of these receptors are linked to neurodevelopmental disorders and chronic psychiatric illnesses, making them a focus for precision medicine and novel drug discovery (PubMed, 31430036).

Other names

GABA-A receptorGABA(A) receptorLigand-gated chloride channelGABA-gated chloride channelGABA receptor chloride channel complex

Positive allosteric modulation of chloride channel opening frequency or duration; direct agonism at the GABA binding site; competitive antagonism; non-competitive inhibition via channel pore blockade.