Dissociation between rewarding and psychomotor effects of opiates: Differential roles for glutamate receptors within anterior and posterior portions of the ventral tegmental area

Maytal Shabat-Simon, Dino Levy, Alon Amir, Moshe Rehavi, Abraham Zangen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The rewarding effects of drugs of abuse are thought to be dependent on the mesocorticolimbic dopamine system, which originates in the ventral tegmental area (VTA) and projects into the nucleus accumbens (NAC) and other forebrain regions. Heroin, by inhibiting GABAergic interneurons in the VTA, induces local dopaminergic activation and release in the NAC terminals. The role of other basic neurotransmitter systems, such as glutamate in the VTA, in mediating the rewarding effect of addictive drugs, is less established. We explored whether blockade of glutamate receptors in subregions of the VTA modulate the rewarding properties and/or the development of psychomotor changes induced by opiates. Administration of 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX; an AMPA/kainate receptor antagonist) into the anterior VTA blocked the rewarding effects of opiates in both the conditioned place preference and the selfadministration paradigms without affecting the gradual increase of the psychomotor response to opiates. In contrast, administration of CNQX into the posterior VTA did not affect the rewarding properties of opiates, but blocked the initial sedative effect of opiates and the gradual increase of the psychomotor response to the drug. These findings suggest a critical role for glutamate receptors in the VTA in opiate reward, as well as behavioral and anatomical dissociation between the rewarding and psychomotor effects of opiates.

Original languageEnglish
Pages (from-to)8406-8416
Number of pages11
JournalJournal of Neuroscience
Volume28
Issue number34
DOIs
StatePublished - 20 Aug 2008

Keywords

  • Addiction
  • Conditioned place preference
  • Glutamate
  • Heroin
  • Reward
  • Self-administration
  • Sensitization
  • Ventral tegmental area

Fingerprint

Dive into the research topics of 'Dissociation between rewarding and psychomotor effects of opiates: Differential roles for glutamate receptors within anterior and posterior portions of the ventral tegmental area'. Together they form a unique fingerprint.

Cite this