Abstract
Rationale
Atypical antipsychotic drugs have been shown to preferentially affect extrastriatal (mesolimbic) D2/D3 receptors over those within the striatum (nigrostriatal). The striatum does not contain exclusively nigrostriatal dopamine tracts, however. The caudate nucleus and ventral parts of the striatum primarily contain limbic and associative dopamine pathways more relevant to psychosis.
Objectives
We tested the hypothesis that two pharmacologically distinct atypical antipsychotic drugs, amisulpride and risperidone, would preferentially occupy of D2/D3 dopamine receptors in limbic and associative regions of the striatum.
Methods
Eight amisulpride-treated patients, six risperidone-treated patients and six age- and sex-matched healthy controls were recruited. Dynamic SPET studies were performed after bolus injection of [123I]epidepride. Binding potential (BP) images were generated using a modified Logan method and aligned between subjects. Regions of interest (ROIs) were placed around head of caudate and putamen bilaterally on an average BP map derived from aligned control images. These ROIs were then applied user-independently to the BP maps for each subject to calculate BP for head of caudate and putamen. Mean occupancy of D2/D3 receptors in each ROI was determined by reference to the drug-free healthy volunteer group. Occupancy values for head of caudate and putamen were compared using paired Student’s t test.
Results
D2/D3 receptor occupancy was 42% in caudate and 31% in putamen for risperidone (t=5.9, df=11, p=0.0001) and 51% in caudate and 37% in putamen for amisulpride (t=11.1, df=15, p<0.0001).
Conclusions
Amisulpride and risperidone both show selective occupancy for limbic and associative D2/D3 receptors within the striatum.
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Acknowledgements
R.A. Bressan was supported by charitable research grants from Janssen Pharmaceuticals Inc. and Sanofi-Synthelabo during the data collection. L.S. Pilowsky was a senior clinical research fellow of the UK Medical Research Council (MRC). K. Erlandsson was supported by the UK MRC Senior Clinical Research Fellowship. We declare that the experiments described in this paper comply with the current laws in the UK.
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Stone, J.M., Bressan, R.A., Erlandsson, K. et al. Non-uniform blockade of intrastriatal D2/D3 receptors by risperidone and amisulpride. Psychopharmacology 180, 664–669 (2005). https://doi.org/10.1007/s00213-005-2161-2
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DOI: https://doi.org/10.1007/s00213-005-2161-2