NDLI: Identification of 7,12-dimethylbenz[a]anthracene metabolites that lead to mutagenesis in mammalian cells.

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Identification of 7,12-dimethylbenz[a]anthracene metabolites that lead to mutagenesis in mammalian cells.

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Identification of 7,12-dimethylbenz[a]anthracene metabolites that lead to mutagenesis in mammalian cells.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Yang, S. K. Chou, M. W. Huberman, E.
Abstract	The mutagenicity of 7,12-dimethylbenz[a]-anthracene (DMBA) and 11 of its enzymatically derived metabolites was tested with Chinese hamster V79 cells for identification of mutagenic metabolites. The metabolites consisted of 7-hydroxymethyl-12-methylbenz[a]anthracene, 7-methyl-12-hydroxymethylbenz[a]anthracene, 7,12-dihydroxymethylbenz[a]anthracene, three trans-3,4-diols, two trans-5,6-diols, and three trans-8,9-diols, all of which derived from DMBA or from the hydroxymethyl derivatives. Mutations were characterized by resistance to ouabain and 6-thioguanine. None of the tested metabolites were mutagenic in V79 cells, which do not metabolize polycyclic aromatic hydrocarbons. Therefore, mutagenesis in the V79 cells was tested in the presence of golden hamster cells capable of metabolizing polycyclic aromatic hydrocarbons (cell-mediated assay). In this assay, DMBA, 7-hydroxymethyl-12-methylbenz[a]anthracene, 7-methyl-12-hydroxymethylbenz[a]anthracene, and their trans3,4-diols were mutagenic for both genetic markers, and the mutagenic response increased as a function of the hydrocarbon dose. All other metabolites were either inactive or showed up to a 4-fold higher mutation frequency than the untreated V79 cells for ouabain and 6-thioguanine resistance. The DMBA-trans-3,4-diol was the only metabolite that was more active than DMBA itself; at 0.05 muM it was 6-8 times more active than DMBA itself; at 0.05 muM it was 6-8 times more active than DMBA in inducing both ouabain and 6-thioguanine resistance. This diol was mutagenic at a dose as low as 0.01 muM. Mutagenesis by DMBA and the trans-3,4-diols was inhibited by 7,8-benzoflavone, an inhibitor of mixed-function oxidases. Analysis of DMBA metabolism in intact golden hamster cells indicated that DMBA-trans-3,4-diol is one of the major metabolites produced. Our results therefore suggest that DMBA-trans-3,4-diol may be metabolized to a diol-epoxide, presumably the trans-3,4-diol-1,2-epoxide, which may be a major reactive metabolite responsible for DMBA mutagenicity in mammalian cells.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	2
Volume Number	76
Language	English
Publisher	National Academy of Sciences
Publisher Date	1979-05-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	9,10-Dimethyl-1,2-benzanthracene Metabolism Benz(a)Anthracenes Mutagens Analogs & Derivatives Animals Benzopyrenes Cell Line Chromatography, High Pressure Liquid Cricetinae Structure-Activity Relationship Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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