Effects of dorsal and ventral hippocampal NMDA stimulation on nucleus accumbens core and shell dopamine release.

Full Abstract

This study has analysed the effects of infusing N-methyl-D-aspartate (NMDA) into either the ventral or dorsal hippocampus on dopamine (DA) transmission in the nucleus accumbens (NAC) core or shell for the first time. Dopamine was measured using in vivo microdialysis with high performance liquid chromatography with electrochemical detection (HPLC-EC). Unilateral NMDA infusion (0.5 microg) into the ventral hippocampus (VH) increased extracellular DA levels in NAC shell during the first 30 min following infusion compared to saline (SAL) infused animals. In contrast, NAC core DA levels were unaffected. NMDA infusion into the dorsal hippocampus (DH) led to a decrease in NAC core DA levels; this effect was not observed in the SAL-infused group. DA levels in NAC shell remained unaltered. At the end of the experiments, we examined the response to a systemic amphetamine (AMPH) injection of 1mg/kg on extracellular DA levels of the NAC core and shell. Interestingly, on2ly animals previously infused with NMDA into the VH exhibited a sensitized DA response in the NAC shell in response to the AMPH injection. We can conclude that VH activation has an acute stimulatory effect on DA release in the shell and that DH activation has a suppressive effect on extracellular DA levels in the core.

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Author information

Author/s: Peleg-Raibstein, Daria (D); Feldon, Joram (J);

Affiliation: Laboratory of Behavioural Neurobiology, Swiss Federal Institute of Technology (ETH Zurich), Schorenstrasse 16, CH-8603 Schwerzenbach, Switzerland.

Journal and publication information

Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't

Journal: Neuropharmacology (Neuropharmacology), published in England. (Language: eng)

Reference: 2006-Oct; vol 51 (issue 5) : pp 947-57

Dates: Created 2006/10/18; Completed 2007/01/12;

PMID: 16876207, status: MEDLINE (last retrieval date: 12/26/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Amphetamine - pharmacology
Analysis of Variance
Animals
Behavior, Animal - drug effects
Central Nervous System Stimulants - pharmacology
Chromatography, High Pressure Liquid - methods
Dialysis - methods
Dopamine - metabolism
Excitatory Amino Acid Agonists - pharmacology

Hippocampus - drug effects
Male
Microinjections - methods
Motor Activity - drug effects
N-Methylaspartate - pharmacology
Nucleus Accumbens - metabolism
Rats
Rats, Wistar
Time Factors

Associated Chemicals: Central Nervous System Stimulants (0) ; Excitatory Amino Acid Agonists (0) ; Amphetamine (300-62-9) ; Dopamine (51-61-6) ; N-Methylaspartate (6384-92-5)

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