LTP in the mouse nucleus accumbens is developmentally regulated.
Glutamatergic transmission in the nucleus accumbens (NAc) has been shown to be important for behavioral adaptations in response to drugs of abuse. NMDA-receptor dependent long-term potentiation (LTP) of glutamatergic synaptic transmission has been hypothesized to underlie many lasting alterations in behavior. Thus, we examined LTP in NAc core and find that it is developmentally regulated. Specifically, tetanus-evoked, NMDA receptor-dependent LTP is observed in the NAc of "adolescent" (3-week-old) mice more frequently than in adult (6-20-week-old) mice. In contrast, cAMP-dependent enhancement of transmission is not developmentally regulated. Removal of extracellular Mg(2+) restores LTP in adult NAc core, suggesting developmental regulation of induction processes rather than maintenance mechanisms. These findings are discussed in the context of behavioral changes elicited in response to drugs of abuse, which differ in adolescent vs. adult rodents and humans.
Schramm
Nicole L
NL
Department of Molecular Physiology and Biophysics, Center for Molecular Neuroscience, Vanderbilt University School of Medicine, Nashville, TN 37232-0615, USA.
Egli
Regula E
RE
Winder
Danny G
DG
D000367:Age Factors; D000818:Animals; D005576:Colforsin / Q000494:pharmacology; D000242:Cyclic AMP / Q000378:metabolism; D004594:Electrophysiology; D005071:Evoked Potentials / Q000502:physiology; D018698:Glutamic Acid / Q000502:physiology; D017774:Long-Term Potentiation / Q000502:physiology*; D008274:Magnesium / Q000494:pharmacology; D008297:Male; D008564:Membrane Potentials / Q000187:drug effects / Q000502:physiology; D051379:Mice; D008810:Mice, Inbred C57BL; D009714:Nucleus Accumbens / Q000254:growth & development* / Q000503:physiopathology*; D009924:Organ Culture Techniques; D016194:Receptors, N-Methyl-D-Aspartate / Q000502:physiology; D019966:Substance-Related Disorders / Q000503:physiopathology; D013569:Synapses / Q000187:drug effects / Q000502:physiology*
D016194:Receptors, N-Methyl-D-Aspartate; D005576:Colforsin; D018698:Glutamic Acid; D000242:Cyclic AMP; D008274:Magnesium