Serotonin2C receptors in the medial prefrontal cortex facilitate cocaine-induced dopamine release in the rat nucleus accumbens

Gian Marco Leggio, Adeline Cathala, Delphine Moison, Kathryn A. Cunningham, Pier Vincenzo Piazza, Umberto Spampinato

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

A functional balance between excitatory and inhibitory control over dopamine (DA)-dependent behavioral and neurochemical effects of cocaine is afforded by the serotonin2C receptor (5-HT2CR) located within the ventral tegmental area and the nucleus accumbens (NAc). The 5-HT2CR located in the medial prefrontal cortex (mPFC) has also been shown to inhibit cocaine-induced behaviors perhaps through inhibition of DA function in the NAc. Using in vivo microdialysis in halothane-anesthetized rats, we tested this hypothesis by assessing the influence of mPFC 5-HT2CRs on cocaine-induced DA outflow in the NAc shell. Intra-mPFC injection of the 5-HT2CR agonist Ro 60-0175 at 5 μg/0.2 μl, but not 1 μg/0.2 μl, potentiated the increase in accumbal DA outflow induced by the intraperitoneal administration of 10 mg/kg of cocaine. Conversely, cocaine-induced accumbal DA outflow was significantly reduced by the intra-mPFC injection of the selective 5-HT2CR antagonist SB 242084 (0.5 μg/0.2 μl) or SB 243213 (0.5 and 1 μg/0.2 μl). These results show that mPFC 5-HT2CRs exert a positive control over cocaine-induced accumbal DA outflow. Observations further support the idea that the overall action of central 5-HT2CRs on accumbal DA output is dependent on the functional balance among different 5-HT2CR populations located within the mesocorticoaccumbens system, and that 5-HT2CRs can modulate DA-dependent behaviors independently of changes of accumbal DA release itself.

Original languageEnglish (US)
Pages (from-to)507-513
Number of pages7
JournalNeuropharmacology
Volume56
Issue number2
DOIs
StatePublished - Feb 2009

Keywords

  • 5-HT receptor
  • Accumbal dopamine release
  • Cocaine
  • Medial prefrontal cortex
  • Nucleus accumbens
  • Rat

ASJC Scopus subject areas

  • Pharmacology
  • Cellular and Molecular Neuroscience

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