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 journalArticle

55 Citations (Scopus)

Abstract

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
Volume227
Issue number4
DOIs
StatePublished - Dec 1 1992

Fingerprint

Mazindol
Ethylmaleimide
Alkylation
Cocaine
Dopamine
Binding Sites
Dextroamphetamine
Corpus Striatum
Dopamine Plasma Membrane Transport Proteins
Amphetamine
Membranes
Pharmaceutical Preparations

Keywords

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

ASJC Scopus subject areas

  • Pharmacology

Cite this

Cocaine and dopamine differentially protect [3H]mazindol binding sites from alkylation by N-ethylmaleimide. / Johnson, Kenneth M.; Bergmann, John S.; Kozikowski, Alan P.

In: European Journal of Pharmacology: Molecular Pharmacology, Vol. 227, No. 4, 01.12.1992, p. 411-415.

Research output: Contribution to journalArticle

Johnson, Kenneth M. ; Bergmann, John S. ; Kozikowski, Alan P. / Cocaine and dopamine differentially protect [3H]mazindol binding sites from alkylation by N-ethylmaleimide. In: European Journal of Pharmacology: Molecular Pharmacology. 1992 ; Vol. 227, No. 4. pp. 411-415.
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