Metabolism of polycyclic aromatic hydrocarbon derivatives to ultimate carcinogens during lipid peroxidation

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Science  01 Jul 1983:
Vol. 221, Issue 4605, pp. 77-79
DOI: 10.1126/science.6304879


Lipid peroxidation triggered by ascorbate or reduced nicotinamide adenine dinucleotide in rat liver microsomes can initiate the epoxidation of 7,8-dihydroxy-7,8-dihydrobenzo[a]pyrene. The stereochemistry of epoxidation is indicative of a peroxide-dependent free radical process. Since the epoxides formed may be the most carcinogenic derivatives of benzo[a]pyrene yet identified, lipid peroxidation can effect the metabolic activation of proximate carcinogens to ultimate carcinogens.