Dopamine in anorexia nervosa: a systematic review

Area of Science:

• Neuroscience
• Psychiatry
• Genetics

Background:

• Anorexia nervosa (AN) is a chronic psychiatric disorder with unclear pathophysiology.
• Dopamine system alterations are implicated in AN.
• Preclinical and clinical evidence present conflicting findings on dopamine's role.

Purpose of the Study:

• To review and synthesize preclinical and clinical evidence on dopamine's role in anorexia nervosa.
• To explore the impact of diet restriction and hyperactivity on dopamine levels.
• To examine genetic and neuroimaging findings related to dopamine in AN.

Main Methods:

• Review of preclinical studies in animal models of AN.
• Analysis of clinical studies investigating dopamine levels and receptor binding in AN patients.
• Examination of genetic association studies and neuroendocrine findings.

Main Results:

• Diet restriction in animals reduced dopamine in some brain regions; hyperactivity increased it in others.
• Clinical studies show inconsistent dopamine levels (CSF, plasma, urine) in AN.
• Neuroimaging suggests increased dopamine receptor binding, implying reduced intrasynaptic dopamine.
• Genetic studies implicate dopamine D2 receptors, dopamine transporter, and COMT.

Conclusions:

• Dopamine dysregulation is complex in anorexia nervosa, with conflicting evidence.
• Further research is needed to clarify dopamine's precise role in AN pathophysiology.
• Targeting the dopamine system, potentially with atypical antipsychotics, shows promise for AN symptoms beyond weight gain.