Ionotropic glutamate receptor kainate-type subunit (KAR)

Ionotropic glutamate receptor kainate-type subunits (KARs) are a distinct family of ligand-gated ion channels that mediate excitatory neurotransmission in the central nervous system. They are composed of five subunits (GluK1-GluK5) that assemble into tetrameric complexes, functioning both as ion channels and through non-canonical metabotropic signaling pathways. KARs play a critical role in modulating synaptic plasticity and regulating the release of other neurotransmitters, such as GABA and glutamate, at both presynaptic and postsynaptic sites. Dysregulation of KAR signaling is strongly implicated in various neurological and psychiatric conditions, including epilepsy, chronic pain, and mood disorders. Consequently, these receptors are significant therapeutic targets, with research focusing on subunit-selective antagonists to treat hyperexcitability-related diseases without the broad side effects associated with other glutamate receptor modulators.

Other names

Kainate receptorGlutamate receptor ionotropic kainateGRIKGluKiGluR5-7KA1-2

Antagonism of kainate receptors to reduce excitatory neurotransmission; Allosteric modulation to stabilize the desensitized state; Agonism to induce excitotoxicity in experimental models.