Journal Article

Quantification of DNA and hemoglobin adducts of 3,4-epoxy-1,2-butanediol in rodents exposed to 3-butene-1,2-diol

M.W. Powley, Y. Li, P.B. Upton, V.E. Walker and J.A. Swenberg

in Carcinogenesis

Volume 26, issue 9, pages 1573-1580
Published in print September 2005 | ISSN: 0143-3334
Published online May 2005 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/bgi119
Quantification of DNA and hemoglobin adducts of 3,4-epoxy-1,2-butanediol in rodents exposed to 3-butene-1,2-diol

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1,3-Butadiene (BD) is a confirmed rodent carcinogen and a suspect human carcinogen that forms mutagenic epoxide metabolites during biotransformation. Species differences in the roles of individual DNA reactive intermediates in BD mutagenicity and carcinogenicity are not completely understood. Evidence suggests that 1,2:3,4-diepoxybutane (DEB) is responsible for the mutagenic effect induced by exposures to low concentrations of BD in mice and that metabolites of 3-butene-1,2-diol (BD-diol) are involved in the mutagenicity at high exposures in both mice and rats. Two reactive metabolites, 3,4-epoxy-1,2-butanediol (EB-diol) and hydroxymethylvinyl ketone (HMVK), are formed during the biotransformation of BD-diol and could potentially be involved in BD-diol associated mutagenicity. To examine the role of EB-diol in BD-diol mutagenicity we have evaluated the dosimetry of N7-(2,3,4-trihydroxybutyl)guanine (THB-Gua) and N-(2,3,4-trihydroxybutyl)valine (THB-Val) in female B6C3F1 mice and female F344 rats exposed by inhalation to 0, 6, 18 and 36 p.p.m. BD-diol for 4 weeks (6 h/day × 5 days/week). Results showed higher levels of both THB-Gua and THB-Val in mice than in rats. An evaluation of THB-Gua adducts showed virtually no differences between liver and lung for either species, suggesting that EB-diol is stable and is freely circulated. The data also indicated that THB adduct formation began to plateau around 18 p.p.m. in both species. Most importantly, the shape of the dose–response curve for THB adduct formation mimicked the one observed for hypoxanthine-guanine phosphoribosyltransferase (Hprt) mutation frequency. This showed that THB adducts, which are not thought to be responsible for causing the mutations, are good quantitative indicators of mutagenicity in rodents exposed to BD-diol. Although the potential contribution of HMVK still needs to be evaluated, the data suggest that EB-diol is responsible, at least in part, for BD-diol associated mutagenicity in rodents.

Keywords: AAG, alkyladenine glycosylase; ADH, alcohol dehydrogenase; BD, 1,3-butadiene; BD-diol, 3-butene-1,2-diol; CYP450, cytochrome P450; DEB, 1,2:3,4-diepoxybutane; EB, 1,2-epoxy-3-butene; EB-diol, 3,4-epoxy-1,2-butanediol; EH, epoxide hydrolase; GC, gas chromatography; GC-MS/MS, gas chromatography–tandem mass spectrometry; GST, glutathione-S-transferase; HBAL, 2-hydroxy-3-butenal; HMVK, hydroxymethylvinyl ketone; Hprt, hypoxanthine-guanine phosphoribosyltransferase; LC-MS/MS, liquid chromatography–tandem mass spectrometry; MI, 1,2-dihydroxy-4-(N-acetylcysteinyl)butane; PFPITC, pentafluorophenylisothiocyanate; SRM, selected reaction monitoring; THB-Gua, N7-(2,3,4-trihydroxybutyl)guanine; THB-Val, N-(2,3,4-trihydroxybutyl)valine

Journal Article.  6197 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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