Stability of surface NMDA receptors controls synaptic and behavioral adaptations to amphetamine.
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.
Mao
Li-Min
LM
Department of Basic Medical Science, University of Missouri Kansas City, USA.
Wang
Wei
W
Chu
Xiang-Ping
XP
Zhang
Guo-Chi
GC
Liu
Xian-Yu
XY
Yang
Yuan-Jian
YJ
Haines
Michelle
M
Papasian
Christopher J
CJ
Fibuch
Eugene E
EE
Buch
Shilpa
S
Chen
Jian-Guo
JG
Wang
John Q
JQ
D000222:Adaptation, Physiological / Q000187:drug effects / Q000502:physiology; D018759:Adrenergic Uptake Inhibitors / Q000494:pharmacology; D000661:Amphetamine / Q000494:pharmacology*; D019969:Amphetamine-Related Disorders / Q000378:metabolism / Q000503:physiopathology*; D000818:Animals; D001519:Behavior / Q000187:drug effects / Q000502:physiology; D003342:Corpus Striatum / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D009473:Neuronal Plasticity / Q000187:drug effects / Q000502:physiology; D009474:Neurons / Q000187:drug effects* / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D016194:Receptors, N-Methyl-D-Aspartate / Q000187:drug effects* / Q000378:metabolism; D013569:Synapses / Q000187:drug effects / Q000502:physiology; D009435:Synaptic Transmission / Q000187:drug effects* / Q000502:physiology
D018759:Adrenergic Uptake Inhibitors; C121001:NR2B NMDA receptor; D016194:Receptors, N-Methyl-D-Aspartate; D000661:Amphetamine