Striatal dopamine in bulimia nervosa: a PET imaging study

Area of Science:

• Neuroscience
• Psychiatry
• Radiology

Background:

• Bulimia nervosa (BN) shares behavioral similarities with addiction.
• Empirical evidence for addiction-like characteristics in BN is limited.
• Brain dopamine (DA) system dysregulation is a hallmark of substance use disorders.

Purpose of the Study:

• To investigate potential abnormalities in the brain's dopamine system in individuals with BN.
• To compare dopamine D(2) receptor binding and release in BN patients versus healthy controls using PET imaging.
• To explore the relationship between dopamine system function and binge eating frequency.

Main Methods:

• Positron Emission Tomography (PET) imaging was employed.
• [(11)C]raclopride was used as a radiotracer to assess dopamine D(2) receptor binding potential (BP(ND)).
• Methylphenidate administration was used to measure striatal DA release (ΔBP(ND)).

Main Results:

• A trend towards lower D(2) receptor BP(ND) was observed in specific striatal regions in the BN group compared to controls.
• Striatal DA release was significantly reduced in the putamen of BN patients.
• Reduced striatal DA release showed a significant association with the frequency of binge eating episodes.

Conclusions:

• The findings suggest that BN is associated with dopamine system abnormalities.
• These abnormalities in brain DA resemble those observed in addictive disorders.
• Dopamine dysregulation may play a role in the pathophysiology of BN and its associated behaviors.