Serotonin 5‐HT2 Receptor Stimulation of Dopamine Release in the Posterior but Not Anterior Nucleus Accumbens of the Rat

• Published in: Journal of neurochemistry 2000-10, Vol.75 (4), p.1625-1633
• Main Authors: Bowers, Barbara J., Henry, Miranda B., Thielen, Richard J., McBride, William J.
• Format: Article
• Language: English
• Subjects: (+)‐1‐(2,5‐Dimethoxy‐4‐iodophenyl)‐2‐aminopropane; Biological and medical sciences; Central nervous system; Central neurotransmission. Neuromudulation. Pathways and receptors; Dopamine release; Fundamental and applied biological sciences. Psychology; LY‐53,857; Microdialysis; Serotonin 5‐HT2 receptors; Vertebrates: nervous system and sense organs
• ISSN: 0022-3042; 1471-4159
• DOI: 10.1046/j.1471-4159.2000.0751625.x

: The objective of the present study was to examine the involvement of serotonin 5‐HT2 receptors within the rat nucleus accumbens (Acc) in the regulation of dopamine (DA) release usingin vivo microdialysis. Perfusion with the 5‐HT2 agonist (+)‐1‐(2,5‐dimethoxy‐4‐iodophenyl)‐2‐aminopropane (DOI), at concentrations of 25‐250 μM, through microdialysis probes located in the posterior Acc increased extracellular DA levels to a maximum of 200% of baseline. DOI‐induced increases in the extracellular levels of DA were Ca2+ dependent and were inhibited by co‐perfusion with the 5‐HT2 antagonist LY‐53,857. DOI enhancement of the extracellular concentrations of DA was observed when probes were implanted in the Acc core and shell regions posterior to anteroposterior +1.2 mm from bregma, whereas a small reduction in the extracellular levels of DA was observed in the anterior Acc. There were no differences between core and shell subdivisions within either the anterior or the posterior Acc. These results suggest that activation of 5‐HT2 receptors within the posterior, but not anterior, Acc stimulates DA release, indicating rostral‐caudal differences in the interactions of 5‐HT with DA systems in the Acc.