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Related Experiment Videos

Microbial mutagenicity studies with (Z)-1,3-dichloropropene.

W P Watson, T M Brooks, K R Huckle

    Chemico-Biological Interactions
    |January 1, 1987
    PubMed
    Summary

    Trace impurities, not (Z)-1,3-dichloropropene (DCP), caused mutagenicity in bacterial assays. Adjusting glutathione levels in these assays eliminated the mutagenic effect, suggesting bacterial mutation tests are only qualitative indicators of mammalian genotoxicity.

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    Area of Science:

    • Toxicology
    • Mutagenesis
    • Chemical Safety

    Background:

    • Previous studies indicated direct mutagenicity of (Z)-1,3-dichloropropene (DCP) in S. typhimurium TA100.
    • Concerns were raised regarding the genotoxicity of DCP and its implications for human health.

    Purpose of the Study:

    • To identify the causative agents of previously observed direct mutagenicity of (Z)-1,3-DCP.
    • To investigate the metabolic activation and detoxification pathways of (Z)-1,3-DCP in bacterial and mammalian systems.
    • To evaluate the reliability of bacterial mutation assays as predictors of mammalian genotoxicity.

    Main Methods:

    • Autoxidation of (Z)-1,3-DCP and identification of resulting impurities using analytical techniques.
    • Purification of (Z)-1,3-DCP via adsorption chromatography on silicic acid.

    Related Experiment Videos

  • Bacterial mutagenicity assays (S. typhimurium TA100) with and without S9 fraction and varying glutathione concentrations.
  • Investigation of mono-oxygenase-catalysed activation and glutathione S-alkyl transferase-mediated detoxification.

    • Main Results:

    • Trace impurities, identified as (Z)- and (E)-2-chloro-3-(chloromethyl)oxiranes (DCP oxides), were responsible for the direct mutagenicity.
    • Purified (Z)-1,3-DCP showed no direct mutagenicity.
    • (Z)-1,3-DCP was indirectly mutagenic via mono-oxygenase activation, but this was efficiently detoxified by mammalian glutathione systems.
    • Elevated glutathione levels in bacterial assays mimicked mammalian detoxification, eliminating indirect mutagenicity.

    Conclusions:

    • The direct mutagenicity of (Z)-1,3-DCP is attributed to autoxidation impurities, not the parent compound.
    • Mammalian detoxification pathways, particularly glutathione conjugation, effectively mitigate the indirect mutagenic potential of (Z)-1,3-DCP.
    • Standard bacterial mutagenicity assays may overestimate the genotoxic risk of (Z)-1,3-DCP due to insufficient detoxification capacity, highlighting their role as qualitative indicators.