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Quinidine-induced decrease of intracellular esterase activity in a hepatoma cell line.

O T Markovic1, D S Young, N S Markovic

  • 1Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia 19104.

Clinical Chemistry
|March 1, 1988
PubMed
Summary
This summary is machine-generated.

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Quinidine drug exposure reduced esterase enzyme activity in Hep G2 liver cells, even without visible cell damage. This finding suggests a new method for studying drug-induced liver toxicity in vitro.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Toxicology

Background:

  • Hepatoma cell lines are valuable models for studying liver cell function and drug effects.
  • Assessing drug-induced toxicity often involves animal studies, which have ethical and practical limitations.

Purpose of the Study:

  • To investigate the effects of quinidine on specific enzyme activities and cell morphology in a human hepatoma cell line.
  • To evaluate a novel in vitro system for studying drug-induced hepatotoxicity as an alternative to animal testing.

Main Methods:

  • Human Hep G2 hepatoma cells were exposed to varying concentrations of quinidine.
  • Image-analyzing equipment was used to measure the activity of naphthol AS-D chloroacetate esterase, alpha-naphthyl butyrate esterase, alpha-naphthyl acetate esterase, and acid phosphatase.

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  • Cell morphology was also observed under different drug concentrations.

    • Main Results:

    • Quinidine exposure led to decreased esterase activity, with effects correlating to drug concentration and exposure duration.
    • Some quinidine concentrations reduced esterase activity without causing apparent changes in cell morphology.
    • Acid phosphatase activity remained unaffected, indicating the observed esterase inhibition was specific and not due to general cell membrane damage.

    Conclusions:

    • The study demonstrates that quinidine specifically inhibits esterase activity in Hep G2 cells.
    • The observed enzyme inhibition can occur independently of significant morphological changes, highlighting a sensitive indicator of drug toxicity.
    • This cell-based assay system shows potential as a non-animal alternative for evaluating drug-induced hepatotoxicity.