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Noscapine-induced polyploidy in vitro.

I D Mitchell1, J B Carlton, M Y Chan

  • 1SmithKline Beecham Pharmaceuticals, Welwyn, Hertfordshire, UK.

Mutagenesis
|November 1, 1991
PubMed
Summary
This summary is machine-generated.

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Noscapine can induce polyploidy in human cells under specific laboratory conditions. However, its use in cough medicine is unlikely to pose a significant genotoxic hazard to humans due to exposure levels and metabolism.

Area of Science:

  • Toxicology
  • Cell Biology
  • Pharmacology

Background:

  • Noscapine is an antitussive agent.
  • Polyploidy induction in vitro requires investigation for genotoxic risk assessment.

Purpose of the Study:

  • To investigate the conditions for noscapine-induced polyploidy in human lymphocytes.
  • To assess the genotoxic hazard potential of noscapine as an antitussive.

Main Methods:

  • In vitro study using human lymphocytes.
  • Varied treatment durations, media (RPMI 1640, Iscove's modified Dulbecco's), and noscapine concentrations.
  • Assessed polyploidy induction and effect of microsomal metabolism (S9 mix).

Main Results:

  • A threshold for polyploidy induction was observed between 15.0-30.0 µg/ml and a maximum between 100.0-150.0 µg/ml.

Related Experiment Videos

  • High polyploidy levels required specific conditions: Iscove's medium and 24h treatments.
  • Metabolic activity (S9 mix) significantly reduced noscapine-induced polyploidy.

    • Conclusions:

    • Prolonged exposure and specific media are needed for significant in vitro polyploidy.
    • Short exposure in the upper GI tract is unlikely to be hazardous.
    • Low systemic exposure is likely safe due to metabolism and a defined threshold.