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Optimizing limbic selective D2/D3 receptor occupancy by risperidone: a [123I]-epidepride SPET study.

Rodrigo A Bressan1, Kjell Erlandsson, Hugh M Jones

  • 1Section of Neurochemical Imaging, Institute of Psychiatry, De Crespigny Park, Denmark Hill, London, UK. r.bressan@iop.kcl.ac.uk

Journal of Clinical Psychopharmacology
|January 25, 2003
PubMed
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Low-dose risperidone selectively blocks dopamine D2/D3 receptors in the brain's limbic areas, not the striatum. This limbic-selective blockade explains its effectiveness and low risk of side effects in patients.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Radiochemistry

Background:

  • Atypical antipsychotics' efficacy is linked to selective dopamine D2-like receptor blockade in limbic-cortical regions.
  • Low-dose risperidone is effective without causing extrapyramidal symptoms, suggesting a similar mechanism.

Purpose of the Study:

  • To investigate if low-dose risperidone achieves 'limbic selective' dopamine D2/D3 receptor blockade in vivo.
  • To quantify striatal versus extrastriatal receptor occupancy by risperidone.

Main Methods:

  • Dynamic single photon emission tomography (SPET) using [123I]-epidepride.
  • Kinetic modeling with the simplified reference region model to calculate binding potential.
  • Comparison of receptor occupancy in patients treated with low-dose risperidone versus controls.

Related Experiment Videos

Main Results:

  • Low-dose risperidone (2.6 mg) showed moderate striatal D2/D3 occupancy (49.9%).
  • Significantly higher D2/D3 occupancy was observed in the thalamus (70.8%) and temporal cortex (75.2%).
  • Striatal occupancy was significantly lower than in thalamus and temporal cortex (p < 0.01).

Conclusions:

  • Low-dose risperidone demonstrates limbic-selective D2/D3 receptor blockade, similar to other atypical antipsychotics.
  • This selectivity supports the hypothesis that limbic D2/D3 receptor occupancy is crucial for therapeutic efficacy.
  • This is the first study to demonstrate risperidone's striatal and extrastriatal occupancy profile.