N-methyl-D-aspartate receptor containing the GluN2B subunit (GluN2B-containing NMDA receptor)

The N-methyl-D-aspartate receptor containing the GluN2B subunit is a heteromeric ligand-gated ion channel in the central nervous system, typically composed of two GluN1 subunits and two GluN2 subunits, where GluN2B confers distinct biophysical and pharmacological properties. GluN2B-containing NMDA receptors display high calcium permeability, moderate single-channel conductance, and sensitivity to voltage-dependent magnesium block. They mediate synaptic transmission and plasticity essential for learning and memory, as well as serve as pivotal regulators of neurodevelopment, dendritic spine formation, and signaling pathways important in cognitive function. GluN2B-specific antagonists and modulators have been developed for research and clinical use, particularly targeting neurodegenerative and neuropsychiatric diseases. Selectivity and safety remain challenges, because disruption of this receptor’s function can lead to neurotoxicity, cognitive effects or psychotomimetic symptoms[3][2][5][7][1][6][9][8][4].

Other names

GluN2B-containing NMDA receptorNR2B-containing NMDA receptorNMDA receptor subtype NR2B (older literature)

Channel blockade: Competitive or non-competitive antagonists block the ion channel pore, preventing calcium influx (e.g., ketamine, memantine, ifenprodil). Allosteric modulation: Some ligands bind remote from the activation site (e.g., Ro 25-6981), modifying receptor gating properties. Modulation via endogenous ligands (e.g., zinc, polyamines): Inhibition or potentiation by synaptically released modulators.