Non-NMDA ionotropic glutamate receptor (Non-NMDA receptor)

AMPA and kainate receptors, collectively known as non-NMDA ionotropic glutamate receptors, are essential components of excitatory signaling in the mammalian brain [MDPI]. They are primarily responsible for the fast component of excitatory postsynaptic currents and play a critical role in synaptic plasticity, which underlies learning and memory processes [NIH]. While AMPA receptors are ubiquitously expressed and mediate the bulk of fast transmission, kainate receptors have a more restricted distribution and serve both postsynaptic and presynaptic modulatory roles [Wikipedia]. Dysregulation of these receptors is implicated in a wide range of neurological and psychiatric disorders, including epilepsy, where excessive activation leads to seizures, and neurodegenerative diseases like Alzheimer's and ALS, where excitotoxicity contributes to neuronal death [NIH]. Pharmacological intervention includes the use of antagonists like perampanel for seizure control and the investigation of positive allosteric modulators as potential cognitive enhancers [MDPI]. However, therapeutic development is often challenged by the need to balance efficacy with side effects such as sedation and cognitive blunting [Neuroscience & Biobehavioral Reviews].

Other names

AMPA/Kainate receptorAMPA/KA receptorQuisqualate receptorIonotropic glutamate receptor (non-NMDA type)

Non-NMDA ionotropic glutamate receptors are ligand-gated ion channels that mediate fast excitatory neurotransmission in the central nervous system [MDPI]. Upon binding of the neurotransmitter glutamate, these receptors undergo a conformational change that opens a cation-selective pore, allowing the influx of sodium (Na+) and efflux of potassium (K+) ions, which leads to rapid membrane depolarization [NIH]. AMPA receptors primarily mediate the peak of the excitatory postsynaptic current, while kainate receptors contribute to both postsynaptic signaling and the presynaptic modulation of neurotransmitter release [Wikipedia]. Some receptor subtypes, particularly those lacking the GluA2 subunit, are also permeable to calcium (Ca2+), which can trigger intracellular signaling pathways or contribute to excitotoxicity [PNAS]. Therapeutic agents targeting these receptors include non-competitive antagonists that reduce neuronal over-excitability and positive allosteric modulators designed to enhance synaptic plasticity and cognitive function [MDPI].