Abstract
A WIDE variety of chemical mutagen/carcinogens induce sister chromatid exchanges (SCE) in cultured Chinese hamster cells and can thus be studied at the chromosomal level1,2. Certain polycyclic hydrocarbons, such as benzo(a)-pyrene, 3-methylcholanthrene, dimethylbenzanthracene and others are important in the aetiology of human bronchial carcinoma3. The substances are not themselves carcinogenic, but are converted to carcinogenic epoxides by the enzyme arylhydrocarbonhydroxylase.4 Epoxides bind non-enzy-matically to DNA, unless they are converted enzymatically to inert water-soluble metabolites by epoxide hydratase5 and glutathione-S-transferase6. The carcinogenic effect of poly-cyclic hydrocarbons is closely connected with the regulation of the enzyme activities and genetic variability can thus be expected. It has been observed at the population level by family studies7 and at the cellular level by biochemical differences in the hydrocarbon-degrading enzyme system8. We have investigated the possible induction of sister chromatid exchanges by benzo(a)pyrene and show that the rate of SCE does not correlate with different rates of benzpyrene metabolism. We therefore suggest that genetic differences in benzpyrene metabolism are unrelated to genetic variation in the predisposition to bronchial carcinomas.
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RÜDIGER, H., KOHL, F., MANGELS, W. et al. Benzpyrene induces sister chromatid exchanges in cultured human lymphocytes. Nature 262, 290–292 (1976). https://doi.org/10.1038/262290a0
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DOI: https://doi.org/10.1038/262290a0
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