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

Bromide-sensitive neuronal inhibitory channels primarily refer to the Gamma-aminobutyric acid type A (GABA-A) receptor and the glycine receptor, which are ligand-gated ion channels that mediate fast inhibitory neurotransmission in the central nervous system (PubMed: 11578307). These channels typically conduct chloride ions (Cl-), but they are also highly permeable to bromide ions (Br-), which can substitute for or supplement chloride to induce membrane hyperpolarization (StatPearls: NBK545210). By increasing the total inhibitory charge transfer, bromide effectively raises the threshold for neuronal firing, which underlies its historical and continued use as an antiepileptic agent, particularly in veterinary medicine and refractory human cases (NCBI: PMC3611655). The interaction of bromide with these channels does not require a specific binding site like benzodiazepines; rather, it relies on the physical permeability of the ionophore to the bromide ion itself. Chronic activation or high concentrations of bromide can lead to "bromism," a toxic state characterized by neurological and psychiatric symptoms, highlighting the narrow therapeutic index of targeting these channels with bromide salts (NIH: PubChem CID 255).

Other names

Bromide-sensitive neuronal inhibitory channelsGABA-A receptorGlycine receptorLigand-gated chloride channelBromide-permeable inhibitory channel

Bromide ions permeate the GABA-A and glycine receptor channels, often with higher permeability than chloride ions, leading to increased inhibitory postsynaptic potentials and neuronal hyperpolarization (PubMed: 11578307).