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Related Experiment Videos

A cocaine-sensitive active dopamine transport in human lymphocytes

B A Faraj1, Z L Olkowski, R T Jackson

  • 1Department of Radiology (Division of Nuclear Medicine), Emory University School of Medicine, Atlanta, GA 30322, USA.

Biochemical Pharmacology
|September 28, 1995
PubMed
Summary

Human lymphocytes have a dopamine transporter sensitive to cocaine. Dopamine uptake in lymphocytes may be linked to chronic cocaine abuse.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Cell Biology

Background:

  • Lymphocytes express dopamine transporters.
  • Dopamine transport systems are crucial in neurological functions.
  • Cocaine's mechanism of action involves dopamine reuptake inhibition.

Purpose of the Study:

  • To characterize the dopamine transporter in human lymphocytes.
  • To investigate the kinetic properties of dopamine uptake.
  • To explore the potential link between lymphocyte dopamine uptake and cocaine abuse.

Main Methods:

  • Utilized radiolabeled dopamine ([3H]dopamine) for uptake studies.
  • Assessed dopamine uptake under varying substrate concentrations and conditions (temperature, ions).
  • Examined the effects of cocaine and related compounds on dopamine uptake.

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Main Results:

  • Identified a high-affinity, cocaine-sensitive dopamine transport system in human lymphocytes.
  • Dopamine uptake exhibited Michaelis-Menten kinetics and was dependent on temperature, sodium, and chloride.
  • Cocaine and its congeners significantly inhibited dopamine uptake in a concentration-dependent manner.
  • Preliminary data suggest a potential inverse correlation between lymphocyte dopamine uptake and chronic cocaine abuse.

Conclusions:

  • Human lymphocytes possess a functional, cocaine-sensitive dopamine transporter.
  • Lymphocyte dopamine uptake characteristics are consistent with neuronal dopamine transporters.
  • Lymphocyte [3H]dopamine uptake may serve as a potential biomarker for chronic cocaine abuse.