PMID: 9434848Jan 22, 1998Paper

Metabolic methylation is a possible genotoxicity-enhancing process of inorganic arsenics

Mutation Research
K YamanakaS Okada

Abstract

To elucidate if the metabolic methylation participates in the induction of inorganic arsenic-responsible genetic damage, arsenite (ARS) and its methylated metabolites, methanearsonic acid (MMAA) and dimethylarsinic acid (DMAA), were comparatively assayed for the induction of DNA damage by determining DNA repair synthesis using polymerization inhibitors such as aphidicolin (aph) and hydroxyurea (HU). When human alveolar epithelial type II (L-132) cells in culture were exposed to either one of these three arsenic compounds, DNA single-strand breaks resulting from the inhibition of repair polymerization were remarkably produced by exposure to DMAA at 5 to 100 microM, while not by that to ARS and MMAA even at 100 microM. Furthermore, a bromodeoxyuridine (BrdrU)-photolysis assay indicated that the induction of DNA repair synthesis was observed only in the case of exposure to DMAA. When L-132 cells were exposed to 100 microM MMAA in the presence of 10 mM S-adenosyl-L-methionine (SAM), which is a well-known methyl-group donor in metabolic methylation of arsenics, DNA repair synthesis was induced along with an increase in the amount of dimethylarsenic in the cells. These results indicate that metabolic methylation of inorganic arsenics...Continue Reading

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Citations

Jun 15, 2001·Teratogenesis, Carcinogenesis, and Mutagenesis·M SordoE Rojas
Jan 17, 2008·Archives of Toxicology·Prasenjit MannaParames C Sil
Dec 4, 2003·Mutation Research·Toby G Rossman
Jul 28, 2004·Toxicology and Applied Pharmacology·David J ThomasMiroslav Styblo
Jul 3, 2010·Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan·Shinichi Miyashita, Toshikazu Kaise
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Sep 21, 2010·Experimental and Toxicologic Pathology : Official Journal of the Gesellschaft Für Toxikologische Pathologie·Mahfoud MessarahAbdelfattah El Feki
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Jun 6, 2003·Environmental Toxicology and Chemistry·Reiji KubotaShinsuke Tanabe
Aug 4, 2004·Free Radical Biology & Medicine·Honglian ShiKe Jian Liu
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