GABA-A receptor rho subunit (GABA-Aρ receptor)

The GABA-A receptor rho subunit is a type of ligand-gated ion channel that conducts chloride ions across neuronal membranes upon activation by gamma-aminobutyric acid (GABA), the main inhibitory neurotransmitter in the central nervous system[1]. Structurally, the receptor is a pentamer made up of five subunits, and the rho subunits (encoded by GABRR1, GABRR2, GABRR3) define its pharmacological properties. GABA-Aρ receptors are primarily found in the retina but are present in other CNS regions as well. They are distinct from classical GABA-A receptors by their subunit composition and slow, sustained chloride current in response to GABA binding. Unlike "classical" GABA-A receptors, the rho-containing receptor shows little to no sensitivity to benzodiazepines and barbiturates. Dysfunction of these receptors contributes to several CNS disorders, highlighting their importance for pharmacological research and therapeutic intervention[1][2][4][7].

Other names

GABA-Aρ receptorrho-GABA_A receptorGABA-A receptor, rho subunitGABRR1 (gene for rho1 subunit)GABRR2 (gene for rho2 subunit)GABRR3 (gene for rho3 subunit)Formerly known as "GABA-C receptor" (historical usage)

Agonists: Enhance chloride influx, hyperpolarizing neurons, reducing excitability and neurotransmission.\nAntagonists/inverse agonists: Block chloride influx, potentially leading to excitation.\nModulators: Alter gating kinetics, ion permeability, or pharmacological responsiveness