Mutagenicity of polyaromatic hydrocarbons by chemical models for cytochrome P450 in Ames assay

Keiko Inami, Satoko Ishikawa, Masataka Mochizuki

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Abstract

DNA damage is an important step in carcinogenesis. The Ames assay is a short-term screening of carcinogens that induce DNA damage. Most carcinogens require enzymatic activation through oxidation by cytochrome P450 (CYP450) in the presence of S9 mix. A combination of iron (Fe)(III) porphyrin and an oxidant is also able to oxidize compounds as an alternative metabolic pathway to CYP450. Previously it was reported that a chemical model containing a water-soluble 5,10,15,20-tetrakis(1-methylpyridinium4-yl)porphyrinatoiron(III) chloride (4-MPy) and tert-butyl hydroperoxide (t-BuOOH) activated aromatic amines and amides. In this study, a chemical model composed of an Fe porphyrin, water-insoluble 5,10,15,20-tetrakis(pentafluorophenyl)porphyrinatoiron(III) chloride (F5P) or water-soluble 4-MPy was optimized with an oxidant - t-BuOOH, magnesium monoperoxyphthalate (MPPT), or iodosylbenzene (PhIO). Subsequently the mutagenicity of benzo[a]pyrene (B[a]P) and chrysene in Salmonella typhimurium TA strains was compared. B[a]P was activated by a combination of F5P or 4-MPy plus MPPT or PhIO in S. typhimurium TA1538. The B[a]P-induced mutagenicity with F5P plus oxidant was higher than 4-MPy plus oxidant. Mutagenicity of chrysene, a tetracyclic aromatic hydrocarbon, was not detected in the presence of F5P/PhIO in S. typhimurium TA98, but was activated in the presence of F5P/MPPT. The F5P/MPPT activated other polyaromatic hydrocarbons (PAH) in the S. typhimurium TA98 assay including dibenz[a,c]anthracene, dibenz[a,h]anthracene, 3-methylcholanthrene, and benzo[a]anthracene. The results indicated that the F5P/MPPT was the most efficient model for detecting PAH-induced mutagenicity in the Ames assay.

Original languageEnglish
Pages (from-to)1169-1176
Number of pages8
JournalToxicological and Environmental Chemistry
Volume92
Issue number6
DOIs
Publication statusPublished - 2010 Jul 1

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Keywords

  • Ames assay
  • Chemical model
  • Cytochrome P450
  • Metabolic activation
  • Polyaromatic hydrocarbon

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

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