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Related Experiment Videos

Central and peripheral cocaine receptors.

D O Calligaro1, M E Eldefrawi

  • 1Department of Pharmacology and Experimental Therapeutics, University of Maryland School of Medicine, Baltimore.

The Journal of Pharmacology and Experimental Therapeutics
|October 1, 1987
PubMed
Summary

Researchers identified high-affinity [3H]cocaine binding sites in rat brain and liver membranes. Cocaine analogs affected neurotransmitter uptake, suggesting these sites are involved in dopamine and norepinephrine transport.

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Area of Science:

  • Neuropharmacology
  • Biochemistry

Background:

  • Cocaine is a potent psychostimulant known to interact with monoamine transporters.
  • Understanding the precise binding characteristics of cocaine is crucial for elucidating its neurobiological effects.

Purpose of the Study:

  • To characterize the high-affinity binding sites for [3H]cocaine in rat brain and liver membranes.
  • To investigate the relationship between cocaine binding and the uptake of neurotransmitters like dopamine and norepinephrine.

Main Methods:

  • Radioligand binding assays using [3H]cocaine on rat brain and liver membrane preparations.
  • Scatchard analysis to determine binding affinities (Kd) and densities (Bmax).
  • Inhibition studies with cocaine analogs on [3H]cocaine, [3H]norepinephrine, and [3H]dopamine uptake in synaptosomes.

Main Results:

  • Two high-affinity [3H]cocaine binding sites were identified in rat whole brain membranes (Kd = 16 nM and 660 nM).
  • The striatum exhibited a higher density of binding sites compared to cortical regions.
  • Liver membranes showed a single high-affinity site (Kd = 1.7 nM) with a high Bmax.
  • Cocaine analogs inhibited neurotransmitter uptake in a rank order consistent with their affinity for cocaine binding sites.

Conclusions:

  • Rat brain and liver possess distinct high-affinity cocaine binding sites.
  • These binding sites are likely associated with monoamine transporters, playing a role in dopamine and norepinephrine regulation.
  • The findings provide insights into the molecular targets of cocaine action.

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