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© 1985 Oxford University Press

research-article

Viscometric detection of liver DNA fragmentation in rats treated with ten aromatic amines. Discrepancies with results provided by the alkaline elution technique

Giovanni Brambilla 1, Pia Carlo, Renata Finollo and Anna Ledda

Institute of Pharmacology, University of Genoa Viale Benedetto XV 2, 1-16132 Genoa, Italy

1To whom all correspondence should be addressed at. Istituto di Farmacologia dell'Università, Viale Benedetto XV 2, 1-16132 Genoa, Italy

A new viscometric technique, capable of detecting DNA strand breaks and alkali-labile sites by monitoring time-dependent changes of DNA reduced viscosity, has been used to evaluate DNA fragmentation in liver of rats treated with single i.p. doses of ten aromatic amines. Persistent and dose-dependent changes of DNA viscometric parameters, which are considered indicative of DNA fragmentation, were produced by six hepatocarcinogenic aromatic amines: 2-naphthylamine, benzidine, 2,4-diaminotoluene, auramine O, 4-aminoazobenzene, and 4-dimethylaminoazobenzene. In contrast, changes of liver DNA viscometric parameters were minimal and transient or practically absent in rats treated with aniline, 1-naphthylamine, 4, 4'-oxydianiline and 2,4-diaminoanisole, all of which are devoid of hepatocarcinogenic activity. The comparison with data previously obtained with the alkaline elution technique demonstrates that the two methods can give different results, and that viscometrically-detected DNA damage is better correlated with carcinogenic activity than DNA damage detected by alkaline elution.


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