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• W2056985000 abstract "The sister chromatid exchange (SCE) induction of mutagens with different mechanisms of action was comparatively investigated on permanent cell lines of the Chinese hamster (CHO, V-79, and DON) with and without exogenous metabolic activation and with the use of various experimental protocols. CHO and V-79 cells were treated with ethylmethanesulfonate (EMS), a direct mutagen; with the two indirect mutagens cyclophosphamide (CP) and benzo[a]pyrene (BP); as well as with the radical former hydrogen peroxide (H2O2) and hydroxyurea (HU), an inhibitor of DNA synthesis. Aside from an increased basal SCE level and a higher bromodeoxyuridine (Brdurd) sensitivity, there was no decisive difference betwen CHO and V-79 cells. However, there was a distinct relationship between SCE induction and the experimental protocol used, which was most pronounced after HU treatment. Neither cell line was able to metabolize the indirect mutagen BP. Only in CHO cells did CP lead to increased SCE frequencies. However, in all cases, the simultaneous application of S9 mix produced a distinct SCE induction. In contrast, BP caused SCE induction in DON cells, whereas CP was not metabolized. The reason for these findings must obviously be sought in the metabolization of CP and BP via different monooxygenase systems, whose activity can differ in these permanent cell lines. One notable finding was that the number of SCE induced by H2O2 could be distinctly reduced by the simultaneous application of S9 mix. This effect can be explained by the fact that S9 mix contains H2O2-degrading enzymes. The results indicate that closely related cell lines differ in their capability for inducing SCE and that investigations of SCE inductions performed on only one cell line do not necessarily produce a representative response." @default.
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• W2056985000 date "1984-01-01" @default.
• W2056985000 modified "2023-09-24" @default.
• W2056985000 title "Different effects of mutagens on sister chromatid exchange induction in three chinese hamster cell lines" @default.
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• W2056985000 doi "https://doi.org/10.1002/em.2860060410" @default.
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