Dopamine increases in striatum do not elicit craving in cocaine abusers unless they are coupled with cocaine cues

Nora D. Volkow, Gene Jack Wang, Frank Telang, Joanna S. Fowler, Jean Logan, Anna Rose Childress, Millard Jayne, Yeming Ma, Christopher Wong

Research output: Contribution to journalArticlepeer-review

149 Scopus citations

Abstract

Imaging studies have shown an association between dopamine increases in striatum and cue induced craving in cocaine abusers. However, the extent to which dopamine increases reflect a primary rather than a secondary response to the cues remains unclear. Here we evaluated the extent to which dopamine increases by themselves can induce craving in cocaine abusers. Using PET and [11C]raclopride (D2 receptor radioligand sensitive to competition with endogenous dopamine) we show that in cocaine abusers (n = 20) oral methylphenidate (20 mg), which significantly increased dopamine in striatum, did not induce craving unless subjects were concomitantly exposed to cocaine cues (video scenes of subjects self-administering cocaine). This suggests that dopamine increases associated with conditioned cues are not primary responses but reflect downstream stimulation of dopamine cells (presumably glutamatergic afferents from prefrontal cortex and/or amygdala). Inasmuch as afferent stimulation of dopamine neurons results in phasic cell firing these findings suggest that "fast" dopamine increases, in contrast to the "slow" dopamine increases as achieved when using oral methylphenidate (mimicking tonic dopamine cell firing), are required for cues to trigger craving. The fact that methylphenidate induced craving only when given with the cocaine cues highlights the context dependency of methylphenidate's effects and suggests that its use for the treatment of ADHD subjects with co-morbid drug abuse should not increase craving.

Original languageEnglish
Pages (from-to)1266-1273
Number of pages8
JournalNeuroImage
Volume39
Issue number3
DOIs
StatePublished - 1 Feb 2008
Externally publishedYes

Keywords

  • Addiction
  • Caudate
  • Conditioned responses
  • D2 receptors
  • PET imaging
  • Putamen
  • Raclopride

Fingerprint

Dive into the research topics of 'Dopamine increases in striatum do not elicit craving in cocaine abusers unless they are coupled with cocaine cues'. Together they form a unique fingerprint.

Cite this