Psychopharmacology

, Volume 110, Issue 3, pp 265–272 | Cite as

5-HT2 and D2 dopamine receptor occupancy in the living human brain

A PET study with risperidone
  • Svante Nyberg
  • Lars Farde
  • Lars Eriksson
  • Christer Halldin
  • Bo Eriksson
Original Investigations

Abstract

It has been suggested that a combined blockade of 5-HT2 and D2 dopamine receptors may be superior to D2 dopamine antagonists alone in the treatment of schizophrenia. Risperidone, which has a high affinity for 5-HT2 and D2 dopamine receptors in vitro, is a new antipsychotic drug that has been developed according to this hypothesis. The aim of this study was to examine if risperidone indeed induces 5-HT2 and D2 dopamine receptor occupancy in vivo in humans. Central receptor occupancy was examined by positron emission tomography (PET) in three healthy men after oral administration of 1 mg risperidone. [11C]N-methylspiperone ([11C]NMSP) was used as a radioligand for determination of 5-HT2 receptor occupancy in the neocortex. Both an equilibrium ratio analysis and a kinetic three-compartmental analysis indicated a 5-HT2 receptor occupancy about 60%. [11C]raclopride was used as a radioligand for determination of D2 dopamine receptor occupancy in the striatum and the calculated occupancy was about 50%. This is the first quantitative determination of 5-HT2 receptor occupancy induced by an antipsychotic drug in the living human brain. The results indicate that 5-HT2 receptor occupancy should be very high at the dose level of 4–10 mg risperidone daily, as suggested for clinical use. Risperidone is thus an appropriate compound for clinical evaluation of the benefit of combined 5-HT2 and D2 dopamine receptor blockade in the treatment of schizophrenia.

Key words

PET Positron emission tomography Human brain Dopamine receptors Serotonin receptors Risperidone 

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • Svante Nyberg
    • 1
  • Lars Farde
    • 1
  • Lars Eriksson
    • 2
  • Christer Halldin
    • 1
  • Bo Eriksson
    • 3
  1. 1.Department of Psychiatry and PsychologyKarolinska HospitalStockholmSweden
  2. 2.Department of NeuroradiologyKarolinska HospitalStockholmSweden
  3. 3.Janssen Pharma ABSweden

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