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Mutagenesis vol. 1 no. 5 pp. 347-352, 1986
© 1986 UK Environmental Mutagen Society/Oxford University Press

other

The induction of DNA adducts in mammalian cells exposed to 1-nitropyrene and its nitro-reduced derivatives

Malcolm J. Edwards1, Shariar Batmanghelich2, Stephen Edwards, James M. Parry and Keith Smith2

School of Biological Sciences 2Chemistry Department, University College of Swansea Singleton Park, Swansea SA2 8PP, UK

1-Nitropyrene, 1-nitrosopyrene and 1-aminopyrene were investigated for their ability to induce covalently bound DNA adducts in calf thymus DNA and Chinese hamster lung fibroblasts. Xanthine oxidase catalysed the induction of one major and one minor DNA adduct in 1-nitropyrene- or 1-nitrosopyrene-treated calf thymus DNA, whilst 1-aminopyrene was inactive. These compounds did not form detectable DNA adducts in the absence of xanthine oxidase. The major DNA adduct produced by 1-nitropyrene and 1-nitrosopyrene in calf thymus DNA co-migrated on h.p.l.c., and the structure was consistent with that previously described by others as N-(deoxyguanosin-8-yl)-1-aminopyrene. The compounds were investigated for their ability to form DNA adducts in Chinese hamster lung fibroblasts. 1-Nitropyrene (5.2 pmol/mg DNA/h) and 1-nitrosopyrene (129 pmol/mg DNA/h) formed a single DNA adduct in Chinese hamster lung cells which co-eluted on h.p.l.c. with the C-8 deoxyguanosine adduct isolated from 1-nitropyrene-treated calf thymus DNA. 1-Nitrosopyrene was the most efficient compound investigated for the production of the C-8 guanine adducts. In contrast, 1-aminopyrene (14.7 pmol/mg DNA/h) induced the formation of a DNA adduct which did not co-elute with the C-8 guanine adduct. The data presented here suggest that 1-nitropyrene and 1-aminopyrene are metabolized to reactive intermediates which form different DNA adducts in Chinese hamster lung fibroblasts.

1To whom correspondence should be addressed


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