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• W2103233885 abstract "This study shows that chronic amphetamine exposure in rats downregulates the NMDA receptor NR2B subunit on striatal neurons. This loss of NR2B has consequences for synaptic transmission and for behavior, sensitizing the rats to the stimulant. Plastic changes in glutamatergic synapses that lead to endurance of drug craving and addiction are poorly understood. We examined the turnover and trafficking of NMDA receptors and found that chronic exposure to the psychostimulant amphetamine (AMPH) induced selective downregulation of NMDA receptor NR2B subunits in the confined surface membrane pool of rat striatal neurons at synaptic sites. This downregulation was a long-lived event and was a result of the destabilization of surface-expressed NR2B caused by accelerated ubiquitination and degradation of crucial NR2B-anchoring proteins by the ubiquitin-proteasome system. The biochemical loss of synaptic NR2B further translated to the modulation of synaptic plasticity in the form of long-term depression at cortico-accumbal glutamatergic synapses. Behaviorally, genetic disruption of NR2B induced and restoration of NR2B loss prevented behavioral sensitization to AMPH. Our data identify NR2B as an important regulator in the remodeling of excitatory synapses and persistent psychomotor plasticity in response to AMPH." @default.
• W2103233885 created "2016-06-24" @default.
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• W2103233885 date "2009-04-06" @default.
• W2103233885 modified "2023-09-28" @default.
• W2103233885 title "Stability of surface NMDA receptors controls synaptic and behavioral adaptations to amphetamine" @default.
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• W2103233885 doi "https://doi.org/10.1038/nn.2300" @default.
• W2103233885 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2749993" @default.
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• W2103233885 hasPublicationYear "2009" @default.
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