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Related Experiment Videos

Decrease in sensitivity to ethidium bromide by caffeine, dimethylsulfoxide or 3-aminobenzamide due to reduced

H Kimura1, T Aoyama

  • 1Department of Experimental Radiology, Shiga University of Medical Science, Japan.

Journal of Pharmacobio-Dynamics
|October 1, 1989
PubMed
Summary

Caffeine, dimethylsulfoxide (DMSO), and 3-aminobenzamide (3AB) reduce Chinese hamster ovary cell sensitivity to ethidium bromide by decreasing its intracellular uptake. This suggests the compounds interfere with the K+ transport system responsible for dye entry.

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Area of Science:

  • Cellular and Molecular Biology
  • Toxicology
  • Drug Resistance Mechanisms

Background:

  • Ethidium bromide is a DNA-intercalating dye used to study cellular responses.
  • Cellular sensitivity to drugs can be altered by various chemical agents.
  • Understanding mechanisms of drug resistance is crucial for therapeutic development.

Purpose of the Study:

  • To investigate how caffeine, DMSO, and 3AB affect cellular sensitivity to ethidium bromide.
  • To determine the impact of these chemicals on the intracellular accumulation of ethidium bromide.
  • To elucidate the role of dye uptake and DNA binding in reduced cellular sensitivity.

Main Methods:

  • Exposure of Chinese hamster ovary cells to ethidium bromide in the presence of caffeine, DMSO, or 3AB.

Related Experiment Videos

  • Measurement of intracellular ethidium bromide accumulation and efflux.
  • In vitro assessment of ethidium bromide binding to DNA.

    • Main Results:

    • Caffeine, DMSO, and 3AB significantly reduced cellular sensitivity to ethidium bromide.
    • These agents decreased intracellular ethidium bromide levels by inhibiting dye uptake, not affecting efflux.
    • Evidence suggests ethidium bromide uptake occurs via a K+ transport system, potentially targeted by these chemicals.
    • A strong correlation was observed between reduced intracellular dye dose and decreased cellular sensitivity.
    • While these chemicals reduced ethidium bromide-DNA binding in vitro, this effect was less correlated with reduced sensitivity compared to uptake inhibition.

    Conclusions:

    • Reduced intracellular accumulation of ethidium bromide, primarily due to inhibited dye uptake, is the main mechanism responsible for the decreased cellular sensitivity observed with caffeine, DMSO, and 3AB.
    • The K+ transport system is implicated in ethidium bromide uptake, and caffeine, DMSO, and 3AB may interfere with this system.
    • While ethidium bromide-DNA binding is affected, it appears to be a secondary factor in the observed reduction of cellular sensitivity to this dye.