Glutamate ionotropic receptor AMPA type subunit 3 (GRIA3)

Glutamate ionotropic receptor AMPA type subunit 3 (GRIA3, also known as GluA3 or Glutamate receptor 3) is a protein subunit forming part of AMPA receptors, which are a major subclass of ionotropic glutamate receptors in the mammalian brain[1][7]. AMPA receptors are tetrameric ligand-gated ion channels that mediate fast excitatory neurotransmission by allowing cation (primarily sodium, sometimes calcium) influx in response to glutamate binding[2][3]. GRIA3 combines with other AMPA subunits (GluA1–4, encoded by GRIA1–4) to form functional heteromeric or (rarely) homomeric channels, influencing the kinetics and ion permeability of the resulting receptor[3]. AMPA receptors play a central role in synaptic plasticity mechanisms underlying learning, memory, and neurodevelopment, and are also implicated in developmental organogenesis and certain disease processes, including intellectual disability and, potentially, schizophrenia[1][4][7]. Pharmacologically, AMPA receptors, including those containing the GRIA3 subunit, are targeted by several centrally-acting drugs including anticonvulsants and research tool antagonists. Because of their pivotal role in CNS excitation, their modulation carries risk of neurological, psychiatric, and safety challenges[1][6]. Caveats or limitations: - GRIA3 is strictly a subunit and does not function independently; drug targeting is directed at AMPA receptors as heteromeric assemblies, not isolated subunits. - No single drug selectively targets GRIA3 without affecting other AMPA subunits. - Biomarker and safety data are generalized from AMPA receptor experience; subunit-specific clinical translation is limited. All information reflects the most up-to-date research consensus as of mid-2025.

Other names

GluA3Glutamate receptor 3Glutamate receptor ionotropic AMPA 3AMPA receptor subunit 3

Non-competitive antagonism (blocking ion channel after glutamate binds); Modulation of gating and synaptic transmission via allosteric sites; Inhibition of fast excitatory synaptic currents by blocking sodium/calcium influx