Receptor-Binding Profiles of Neuroleptics

  • J. Hyttel
  • J.-J. Larsen
  • A. V. Christensen
  • J. Arnt
Conference paper
Part of the Psychopharmacology Supplementum book series (PSYCHOPHARM, volume 2)

Abstract

Dopamine-receptor blockade seems to be a prominent effect of neuroleptics. Blockade of other receptors might, however, contribute to the therapeutic effect. A series of neuroleptics have been tested for affinity to DA D-1 and D-2 receptors, serotonin receptors (S2), α-adrenoceptors (α1), histamine receptors (H1, and muscarinic cholinergic receptors.

According to the affinity to DA D-1 and D-2 receptors, neuroleptics can be divided into different groups. Thioxanthenes have affinity for both D-1 and D-2 receptors; phenothiazines have affinity for D-2 receptors and considerably lower affinity for D-1 receptors; and butyrophenones, diphenylbutylpiperidines, and benzamides have affinity only for D-2 receptors.

Concerning affinity to other receptors the only consistent finding is affinity for S2 receptors.

The clinical significance of these findings is speculative. In several behavioral tests the D-1/D-2 classification is also observed, and it is suggested that D-1-receptor activation is responsible for dyskinesia, and that thioxanthenes — due to their D-1 receptor blocking effect — induce less dyskinesia than other neuroleptics.

Keywords

Dopamine Schizophrenia Clozapine Amphetamine Methylphenidate 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1985

Authors and Affiliations

  • J. Hyttel
  • J.-J. Larsen
  • A. V. Christensen
  • J. Arnt
    • 1
  1. 1.H. Lundbeck A/SCopenhagen-ValbyDenmark

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