Australasian Society of Clinical and Experimental Pharmacologists and Toxicologists, 1994: OPPOSING ROLES FOR DOPAMINE AND SEROTONIN AT PRESYNAPTIC RECEPTORS IN THE VENTRAL TEGMENTAL AREA

D. L. Cameron, J. T. Williams

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

1. Dopamine D1 and SHT1d receptors are found on the terminals of afferent GABA neurons that synapse on the ventral tegmental area (VTA) dopamine neurons. The role of these receptors in the actions of cocaine was investigated using intracellular recordings in a brain slice preparation. Synaptic potentials were generated in the slice and GABA‐mediated inhibitory post‐synaptic potentials (IPSP) were identified. 2. Stimulation of dopamine D1 receptors selectively enhanced the GABAb IPSP, and this effect was blocked by D1 antagonists. The magnitude of the IPSP was decreased when D1 antagonists were applied in isolation, suggesting tonic D1 receptor stimulation via dendritically released dopamine. 3. Cocaine had an opposite effect and selectively decreased the magnitude of the GABAb IPSP. This action was mimicked by 5HT and the SHT1d agonist sumatriptan, and attenuated by the 5HTI1D/2c antagonist, metergoline. The action of cocaine was also mimicked by the 5HT‐releasing agent, fenfluramine, and blocked by pre‐incubation of the slice with the 5HT‐depleting agent, para‐chloroamphetamine. 4. The results of this study suggest that dopamine and 5HT have opposing roles in modulating GABA input into VTA dopamine neurons. The actions of cocaine on this interplay may have implications for understanding its addictive properties.

Original languageEnglish (US)
Pages (from-to)841-845
Number of pages5
JournalClinical and Experimental Pharmacology and Physiology
Volume22
Issue number11
DOIs
StatePublished - Nov 1995

Keywords

  • 5HT receptor
  • D receptor
  • cocaine
  • dopamine
  • electrophysiology
  • guinea‐pig
  • serotonin
  • synaptic potential
  • ventral tegmental area.
  • γ‐aminobutyric acid

ASJC Scopus subject areas

  • Physiology
  • Pharmacology
  • Physiology (medical)

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