Glutamate ionotropic receptor AMPA type subunit (AMPAR) (AMPAR)

The AMPA receptor (AMPAR) is a tetrameric ligand-gated ion channel composed of four subunits (GluA1-GluA4) that mediates the majority of fast excitatory neurotransmission in the central nervous system [Wikipedia, 2024]. It is essential for synaptic plasticity, including long-term potentiation (LTP) and long-term depression (LTD), which are the molecular foundations of learning and memory [StatPearls, 2023]. Dysregulation of AMPA receptor function is implicated in a wide range of neurological and psychiatric conditions, including epilepsy, where over-activation leads to seizures, and neurodegenerative diseases like Alzheimer's, where receptor loss contributes to cognitive decline [NIH, 2024]. Pharmacological intervention includes antagonists like perampanel for seizure control and positive allosteric modulators, known as ampakines, which are being investigated for their potential to enhance cognition and treat depression [PubMed, 2022]. The subunit composition, particularly the presence of the GluA2 subunit, determines the receptor's permeability to calcium, a key factor in excitotoxic neuronal death [UniProt, 2024].

Other names

AMPA receptorAMPARQuisqualate receptorGluA1GluA2GluA3GluA4GluR1GluR2GluR3GluR4GRIA1GRIA2GRIA3GRIA4Alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor

AMPA receptor modulators function through several mechanisms: non-competitive antagonism at the allosteric site (e.g., perampanel) to inhibit ion flow and reduce neuronal excitability in epilepsy; positive allosteric modulation (e.g., ampakines) to slow receptor desensitization and deactivation, thereby enhancing synaptic strength for cognitive enhancement; and competitive antagonism at the glutamate binding site (e.g., NBQX) to block receptor activation [PubMed, 2022].