Dopamine receptors in bovine retina: Characterization of the 3H-spiroperidol binding and its use for screening dopamine receptor affinity of drugs

Pierre Magistretti*, Michael Schorderet

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


3H-spiroperidol bound in a saturable, stereospecifically displaceable manner to homogenates of bovine retina. Scatchard analysis of saturation experiments showed a KD of 1.35 nM and a density of binding sites of 107 fmoles · mg protein-1. Stereospecifically displaceable binding was pH and temperature dependent and linear with tissue concentration. Spiroperidol, pimozide, haloperidol and d-butaclamol were the most potent compounds in drug displacement curves (8.74 > pIC50 > 7.61 M). Other neuroleptics such as cisflupenthixol, fluphenazine, clozapine, chlorpromazine and pipamperone, were one order of magnitude less potent. Among dopamine agonists, apomorphine (pIC50 = 7.08 ± 0.19 M) was about 50 times more potent than dopamine itself, epinine and ADTN. Serotonin, α- and ß-adrenergic receptors agonists and antagonists were inactive. These results indicate that the sites labelled by 3H-spiroperidol in retina are dopaminergic; moreover the rank order of various antagonists and agonists observed in displacement curves suggests that this preparation could also provide a useful tool to reveal the selective affinity of drugs for the CNS dopamine receptor linked to the enzyme adenylylcyclase (D1-receptors).

Original languageEnglish (US)
Pages (from-to)1675-1685
Number of pages11
JournalLife Sciences
Issue number19
StatePublished - Nov 5 1979

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)


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