Affinity of neuroleptics for D1 receptor of human brain striatum

S. Kanba, E. Suzuki, S. Nomura, T. Nakaki, G. Yagi, M. Asai, E. Richelson

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We determined the inhibition-dissociation constant (Ki) of a number of neuroleptics for D1 receptors of normal human brain tissue using [3H]SCH23390 [R-(+)-8-chloro-2,3,4,5-tetrahydro-3-methyl-5-phenyl-1H-3[benzazepine- 7-ol]. SCH23390 had the highest affinity with a Ki of 0.76 nM. Among clinically used drugs, propericiazine showed the highest affinity with a Ki of 10 nM. When neuroleptics were classified according to chemical structures, the Ki values were as follows. Phenothiazines ranged from 10 nM to 250 nM. Butyrophenones ranged from 45 nM to 250 nM. Thioxanthenes ranged from 12 nM to 340 nM. Orthopramines were more than 10,000 nM. The Ki values for the binding site of this study were significantly correlated with those reported in studies using animal brain. The possible relationship between D1 receptors and negative symptoms is discussed.

Original languageEnglish (US)
Pages (from-to)265-269
Number of pages5
JournalJournal of Psychiatry and Neuroscience
Issue number4
StatePublished - 1994


  • dopamine D receptors
  • human brain
  • negative symptoms
  • neuroleptics
  • radioreceptor assay

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Pharmacology (medical)
  • Biological Psychiatry


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