Synthesis, in vitro metabolism, mutagenicity, and DNA-adduction of naphtho[1,2-e]pyrene

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Abstract

Literature data, although limited, underscore the contribution of C24H14 polycyclic aromatic hydrocarbons to the biological activity of the extracts of complex environmental samples. However, little attention has been given to naphthopyrene (NP) isomers due to lack of synthetic standards and, therefore, lack of studies aimed at unequivocal identification of C24H14 isomers in environmental samples. We hypothesize that naphtho[1,2-e]pyrene (N[1,2-e]P), having a fjord region and a bay region might be a potent mutagen. To test our hypothesis, we synthesized N[1,2-e]P by Suzuki reaction and examined its in vitro metabolism with the S9 fraction from phenobarbital/β-naphthoflavone-induced rat liver homogenates. We have tentatively identified its K-region diol as the major metabolite and a fjord region dihydrodiol as minor metabolite. Contrary to our hypothesis, N[1,2-e]P was not mutagenic in S. typhimurium strain TA 100 and did not induce morphological cell transformation in mammalian cells. Its metabolite, 11,12-dihydroxy-11,12-dihydro-N[1,2-e]P was a weak mutagen. The reaction of calf thymus DNA with N[1,2-e]P-11,12-diol13,14-epoxide showed that it reacts predominately with the exocyclic amino group of adenine.

Original languageEnglish (US)
Pages (from-to)267-276
Number of pages10
JournalPolycyclic Aromatic Compounds
Volume22
Issue number3-4
DOIs
StatePublished - Jan 1 2002

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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