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Addict Biol. 2017 Nov;22(6):1601-1609. doi: 10.1111/adb.12457. Epub 2016 Oct 13.

Evidence for GABA-A receptor dysregulation in gambling disorder: correlation with impulsivity.

Author information

1
Centre for Neuropsychopharmacology, Division of Brain Sciences, Faculty of Medicine, Imperial College London, UK.
2
Department of Psychobiology, Universidade Federal de São Paulo, Brazil.
3
Centre for Affective Disorders, Department of Psychological Medicine, Institute of Psychiatry, Psychology and Neuroscience, King's College London, UK.
4
Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, King's College, UK.
5
Imanova Ltd., Centre for Imaging Sciences, UK.
6
Department of Neuroimaging, Institute of Psychiatry, King's College, UK.
7
Department of Imaging, Division of Experimental Medicine, Department of Medicine, Imperial College, UK.
8
National Problem Gambling Clinic, CNWL NHS Foundation Trust, Imperial College London, UK.
9
Centre for Gambling Research at UBC, Department of Psychology, University of British Columbia, Canada.

Abstract

As a behavioural addiction, gambling disorder (GD) provides an opportunity to characterize addictive processes without the potentially confounding effects of chronic excessive drug and alcohol exposure. Impulsivity is an established precursor to such addictive behaviours, and GD is associated with greater impulsivity. There is also evidence of GABAergic dysregulation in substance addiction and in impulsivity. This study therefore investigated GABAA receptor availability in 15 individuals with GD and 19 healthy volunteers (HV) using [11 C]Ro15-4513, a relatively selective α5 benzodiazepine receptor PET tracer and its relationship with impulsivity. We found significantly higher [11 C]Ro15-4513 total distribution volume (VT ) in the right hippocampus in the GD group compared with HV. We found higher levels of the 'Negative Urgency' construct of impulsivity in GD, and these were positively associated with higher [11 C]Ro15-4513 VT in the amygdala in the GD group; no such significant correlations were evident in the HV group. These results contrast with reduced binding of GABAergic PET ligands described previously in alcohol and opiate addiction and add to growing evidence for distinctions in the neuropharmacology between substance and behavioural addictions. These results provide the first characterization of GABAA receptors in GD with [11 C]Ro15-4513 PET and show greater α5 receptor availability and positive correlations with trait impulsivity. This GABAergic dysregulation is potential target for treatment.

KEYWORDS:

GABA system; [11C]Ro15-4513 PET; gambling disorder

PMID:
27739164
PMCID:
PMC5697606
DOI:
10.1111/adb.12457
[Indexed for MEDLINE]
Free PMC Article

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