Striatal cue-reactivity and neurotransmitter function in gambling disorder

Area of Science:

• Neuroscience
• Psychiatry
• Addiction Research

Background:

• Abnormal striatal cue reactivity is a hallmark of substance use disorders (SUDs).
• Understanding cue reactivity in behavioral addictions like gambling disorder (GD) is crucial for developing targeted therapies.
• Neural mechanisms of cue reactivity in GD are not well understood.

Purpose of the Study:

• To investigate striatal cue reactivity in individuals with GD.
• To explore the association between cue reactivity and neurotransmitter function in GD.
• To utilize multimodal neuroimaging techniques for comprehensive analysis.

Main Methods:

• Functional magnetic resonance imaging (fMRI) to measure brain activity (BOLD response).
• Positron emission tomography (PET) imaging with radiotracers for dopamine, opioid, and serotonin systems.
• Comparison of brain responses between 13 individuals with GD and 16 healthy controls (HC) to gambling, erotic, and neutral videos.

Main Results:

• GD subjects showed significantly greater dorsal striatal BOLD response to gambling cues compared to controls.
• Enhanced cue reactivity in GD was specific to gambling stimuli, not natural rewards.
• In GD, dorsal striatal activity correlated with mu-opioid receptor availability ([11C]carfentanil binding).

Conclusions:

• Gambling disorder is characterized by increased dorsal striatal activity in response to gambling cues.
• This heightened cue-induced activity is associated with mu-opioid receptor availability.
• The findings suggest the mu-opioid system is implicated in mediating cue reactivity in behavioral addictions.