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Dopamine receptor availability in Tourette's syndrome

M S George1, M M Robertson, D C Costa

  • 1Department of Clinical Neurology, Institute of Neurology, London, England.

Psychiatry Research
|December 1, 1994
PubMed
Summary
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Dopamine D2/D3 receptor availability is not abnormal in Gilles de la Tourette Syndrome (GTS). Unmedicated GTS patients showed normal binding, but those on D2 blocking medications had decreased binding, suggesting medication effects, not intrinsic GTS pathology.

Area of Science:

  • Neuroscience
  • Radiology
  • Pharmacology

Background:

  • Gilles de la Tourette Syndrome (GTS) is associated with abnormal dopaminergic activity.
  • Investigating dopamine D2/D3 receptor dysregulation is crucial for understanding GTS pathophysiology.

Purpose of the Study:

  • To assess D2/D3 receptor availability in GTS patients using 123I-IBZM SPECT.
  • To differentiate between intrinsic GTS pathology and medication effects on dopamine receptors.

Main Methods:

  • Dynamic single-slice SPECT imaging with 123I-IBZM was performed on 15 GTS patients (8 unmedicated) and 6 healthy controls.
  • Radioactivity in the basal ganglia was compared to the visual cortex to quantify receptor binding.
  • Patients were categorized based on medication status (unmedicated vs. D2 blocking medications).

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Main Results:

  • Unmedicated GTS patients exhibited no significant difference in 123I-IBZM binding compared to controls.
  • GTS patients on D2 blocking medications showed significantly reduced 123I-IBZM binding in the basal ganglia.
  • These findings indicate that medication, not GTS itself, affects D2/D3 receptor availability measurements.

Conclusions:

  • D2/D3 receptor availability, measured by 123I-IBZM SPECT, is not intrinsically abnormal in Gilles de la Tourette Syndrome.
  • The observed reduction in binding in medicated patients highlights the impact of D2 blocking drugs on SPECT imaging.
  • Further research should consider medication status when evaluating dopaminergic function in GTS.