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Quantitative correlations amongst alkaline DNA fragmentation, DNA covalent binding, mutagenicity in the Ames test and

S Parodi, M Taningher, P Boero

    Mutation Research
    |March 1, 1982
    PubMed

    Insights

    Predicting chemical carcinogenicity is improved by using multiple short-term tests. DNA covalent binding in vivo shows a stronger correlation with carcinogenicity than Ames test mutagenicity, suggesting its enhanced predictive value.

    Area of Science:

    • Toxicology
    • Molecular Biology
    • Biochemistry

    Background:

    • Carcinogenic potency assessment is crucial for risk evaluation.
    • Quantitative comparison of diverse chemical compounds is challenging.
    • Short-term tests aim to predict long-term carcinogenicity.

    Purpose of the Study:

    • To quantitatively compare carcinogenic potency using four distinct parameters.
    • To evaluate the predictive value of in vivo DNA adducts, DNA fragmentation, acute toxicity, and Ames test mutagenicity.
    • To determine the optimal combination of short-term tests for improved carcinogenicity prediction.

    Main Methods:

    • Quantitative comparison of 21 compounds across four parameters.
    • Statistical analysis to correlate parameters with carcinogenic potency.
    • Multivariate analysis to assess the combined predictive power of multiple tests.

    Main Results:

    • All tested parameters (DNA binding, DNA fragmentation, acute toxicity, mutagenicity) correlated with carcinogenic potency.
    • In vivo DNA covalent binding showed a stronger correlation with carcinogenicity than Ames test mutagenicity (3:1 ratio).
    • In vivo DNA adducts and DNA fragmentation were highly correlated.
    • Multivariate analysis indicated significant improvement in quantitative predictability using a battery of tests.

    Conclusions:

    • A combination of short-term tests offers improved quantitative prediction of carcinogenicity.
    • Selecting relatively independent yet carcinogen-correlated tests maximizes predictive improvement.
    • In vivo DNA covalent binding and fragmentation are valuable biomarkers for carcinogenicity assessment.

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