Glycine receptor chloride channel (GlyR)

The **glycine receptor chloride channel** (GlyR) is a pentameric ligand-gated ion channel of the Cys-loop receptor family, composed of four possible alpha subunits (α1-4) and a beta subunit arranged around a central chloride-permeable pore. GlyRs are the major mediators of inhibitory neurotransmission in the spinal cord, brainstem, and some other brain regions. Upon binding glycine, these receptors open to allow chloride influx, resulting in neuronal hyperpolarization and inhibition of action potential firing. GlyR dysfunction is linked to rare heritable diseases like hyperekplexia (startle disease) and plays a role in several neurological and pain conditions. GlyRs are targets for a range of compounds including strychnine (high-affinity antagonist), ethanol, ivermectin, propofol, taurine, and certain neurosteroids, though clinically approved GlyR-specific drugs remain limited. Efforts to develop more selective modulators are ongoing due to the therapeutic potential for pain, spasticity, and neurological disorders[1][4][5][6][7][8][9].

Other names

Glycine receptorGlycine-gated chloride channelGlyR chloride channelGlycine-gated anion channel

Agonist binding (glycine and related ligands open the chloride channel, leading to hyperpolarization). Antagonism (blockade of channel opening, e.g., by strychnine). Allosteric modulation (compounds can increase/decrease opening probability or efficacy).