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Psychopharmacology

, Volume 168, Issue 1–2, pp 164–169 | Cite as

Cannabinoid modulation of the reinforcing and motivational properties of heroin and heroin-associated cues in rats

  • Taco J. De VriesEmail author
  • Judith R. Homberg
  • Rob Binnekade
  • Halfdan Raasø
  • Anton N. M. Schoffelmeer
Original Investigation

Abstract

Rationale

Recently, we provided evidence for a cannabinoid mechanism in relapse to cocaine seeking in rats. There is also increasing evidence for functional cross-talk between cannabinoid and opioid systems in several physiological processes.

Objectives

This study was designed to evaluate whether the cannabinoid system plays a role in mediating the reinforcing and motivational effects of heroin and heroin-paired stimuli.

Methods

Male Wistar rats were trained to self-administer heroin (50 μg/kg per infusion) on fixed (FR5) or progressive ratio schedules of reinforcement in the presence of a discriminative and discrete heroin-associated cue. The selective cannabinoid CB1 antagonist SR141716A was given 30 min before the session to determine its effect on responding for heroin. Separate groups of rats were subjected to extinction training during which heroin-associated cues were absent and no heroin was delivered. During subsequent reinstatement tests, the effects of the cannabinoid agonist HU210 and the antagonist SR141716A on reinstatement of heroin seeking were evaluated.

Results

The cannabinoid antagonist dose-dependently reduced responding for heroin on the FR5 schedule and to a greater extent on the progressive ratio schedule. HU210 (20 μg/kg) reinstated heroin seeking behaviour following a 2-week extinction period, whereas SR141716A dose-dependently attenuated heroin seeking that was provoked by a priming injection of heroin (0.25 mg/kg) and heroin seeking that was triggered by re-exposure to heroin paired stimuli.

Conclusions

The results show that the reinforcing and motivational effects of heroin and heroin-paired stimuli are mediated, at least in part, by activation of cannabinoid CB1 receptors. Therefore, the present study provides a rationale for the use of cannabinoid antagonists in the treatment of opiate addiction.

Keywords

Heroin self-administration Reinstatement of drug seeking CB1 receptors Relapse Reinforcement Cannabis 

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Taco J. De Vries
    • 1
  • Judith R. Homberg
    • 1
  • Rob Binnekade
    • 1
  • Halfdan Raasø
    • 1
  • Anton N. M. Schoffelmeer
    • 1
  1. 1.Research Institute Neurosciences Vrije Universiteit, Drug Abuse Program, Department of Medical PharmacologyVU Medical CenterAmsterdamThe Netherlands

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