N-methyl-D-aspartate receptor subunit 2B-containing N-methyl-D-aspartate receptor (NR2B-containing NMDA receptor)

The **NR2B-containing NMDA receptor** is a heterotetrameric ligand-gated ion channel composed of two obligatory GluN1 subunits and typically two GluN2B subunits; this subtype is a critical mediator of excitatory neurotransmission and calcium influx in the central nervous system[7][5]. It plays essential roles in synaptic plasticity, learning, and memory, and is prominent in the forebrain and prefrontal cortex, especially during development and early adulthood[2][4][5]. The NR2B subunit modulates channel kinetics (slower decay, prolonged calcium entry), which facilitates temporal summation and persistent neuronal firing necessary for working memory and cognitive function[4]. Pathologically, NR2B-containing NMDA receptors are strongly implicated in neurodegenerative disease (via excitotoxicity), stroke, pain, and psychiatric disorders. The subunit's unique pharmacology allows for selective targeting by allosteric antagonists, such as ifenprodil and its derivatives, which inhibit NR2B-containing receptor function and may provide therapeutic benefit with fewer motor side effects than nonselective NMDA antagonists[6][8]. However, antagonism may be associated with impaired cognition, psychosis-like symptoms, and other CNS adverse events. The receptor remains a high-profile target for drug development in neurology and psychiatry due to its pivotal role in excitatory synaptic transmission and plasticity[2][4][5][6][8].

Other names

NR2B-containing NMDARGluN2B-containing NMDA receptorN-methyl-D-aspartate receptor subtype 2B-containing receptorGRIN2B-containing NMDA receptor

Allosteric antagonism (e.g., ifenprodil blocks receptor action via the NR2B subunit[6][8]) Noncompetitive inhibition (certain drugs block channel function without competing with glutamate) Modulation of receptor trafficking/synaptic localization Reduced calcium influx into neurons Inhibition of excitotoxic cell death