Cocaine and dopamine differentially protect [3H]mazindol binding sites from alkylation by N-ethylmaleimide

Kenneth M. Johnson, John S. Bergmann, Alan P. Kozikowski

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


The binding of cocaine, d-amphetamine and dopamine to the site on the dopamine transporter labeled by [3H]mazindol was investigated in rat striatal membranes. N-Ethylmalcimide inhibited about 95% of the specific binding of 5 nM [3H]mazindol in a concentration-dependent manner. The effect of 10 mM N-ethylmaleimide was completely prevented by cocaine (EC50 of 3 μM). but neither 300 μM dopamine nor d-amphetamine afforded any significant protection. On the other hand, high concentrations of cocaine, d-amphetamine and dopamine provided similar protection against inhibition by 0.1 mM N-ethylmalcimide. Taken together these data support the hypothesis that a significant portion of the cocaine binding domain on the transporter is distinct from that of either dopamine or amphetamine. This distinction may be sufficient to allow properly designed drugs to prevent cocaine binding without inhibiting DA transport.

Original languageEnglish (US)
Pages (from-to)411-415
Number of pages5
JournalEuropean Journal of Pharmacology: Molecular Pharmacology
Issue number4
StatePublished - Dec 1 1992


  • Cocaine
  • Dopamine transport
  • N-Ethylmalcimide alkylation
  • [H]Mazindol binding
  • d-Amphetamine

ASJC Scopus subject areas

  • Pharmacology


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