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Neuroimage. 2012 Oct 15;63(1):40-6. doi: 10.1016/j.neuroimage.2012.06.067. Epub 2012 Jul 6.

Striatal dopamine D₂/D₃ receptor binding in pathological gambling is correlated with mood-related impulsivity.

Author information

1
Department of Experimental Psychology, University of Cambridge, Cambridge, UK. lc260@cam.ac.uk

Abstract

Pathological gambling (PG) is a behavioural addiction associated with elevated impulsivity and suspected dopamine dysregulation. Reduced striatal dopamine D(2)/D(3) receptor availability has been reported in drug addiction, and may constitute a premorbid vulnerability marker for addictive disorders. The aim of the present study was to assess striatal dopamine D(2)/D(3) receptor availability in PG, and its association with trait impulsivity. Males with PG (n=9) and male healthy controls (n=9) underwent [11C]-raclopride positron emission tomography imaging and completed the UPPS-P impulsivity scale. There was no significant difference between groups in striatal dopamine D(2)/D(3) receptor availability, in contrast to previous reports in drug addiction. However, mood-related impulsivity ('Urgency') was negatively correlated with [11C]-raclopride binding potentials in the PG group. The absence of a group difference in striatal dopamine binding implies a distinction between behavioural addictions and drug addictions. Nevertheless, our data indicate heterogeneity in dopamine receptor availability in disordered gambling, such that individuals with high mood-related impulsivity may show differential benefits from dopamine-based medications.

PMID:
22776462
PMCID:
PMC3438449
DOI:
10.1016/j.neuroimage.2012.06.067
[Indexed for MEDLINE]
Free PMC Article

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