Journal Article

Mouse Arsenic (+3 Oxidation State) Methyltransferase Genotype Affects Metabolism and Tissue Dosimetry of Arsenicals after Arsenite Administration in Drinking Water

Baowei Chen, Lora L. Arnold, Samuel M. Cohen, David J. Thomas and X. Chris Le

in Toxicological Sciences

Volume 124, issue 2, pages 320-326
Published in print December 2011 | ISSN: 1096-6080
Published online September 2011 | e-ISSN: 1096-0929 | DOI: http://dx.doi.org/10.1093/toxsci/kfr246
Mouse Arsenic (+3 Oxidation State) Methyltransferase Genotype Affects Metabolism and Tissue Dosimetry of Arsenicals after Arsenite Administration in Drinking Water

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Arsenic (+3 oxidation state) methyltransferase (As3mt) catalyzes methylation of inorganic arsenic (iAs) producing a number of methylated arsenic metabolites. Although methylation has been commonly considered a pathway for detoxification of arsenic, some highly reactive methylated arsenicals may contribute to toxicity associated with exposure to inorganic arsenic. Here, adult female wild-type (WT) C57BL/6 mice and female As3mt knockout (KO) mice received drinking water that contained 1, 10, or 25 ppm (mg/l) of arsenite for 33 days and blood, liver, kidney, and lung were taken for arsenic speciation. Genotype markedly affected concentrations of arsenicals in tissues. Summed concentrations of arsenicals in plasma were higher in WT than in KO mice; in red blood cells, summed concentrations of arsenicals were higher in KO than in WT mice. In liver, kidney, and lung, summed concentrations of arsenicals were greater in KO than in WT mice. Although capacity for arsenic methylation is much reduced in KO mice, some mono-, di-, and tri-methylated arsenicals were found in tissues of KO mice, likely reflecting the activity of other tissue methyltransferases or preabsorptive metabolism by the microbiota of the gastrointestinal tract. These results show that the genotype for arsenic methylation determines the phenotypes of arsenic retention and distribution and affects the dose- and organ-dependent toxicity associated with exposure to inorganic arsenic.

Keywords: inorganic arsenic; methylation; arsenic(III) methyltransferase; As3mt; mouse; metabolism; biotransformation and toxicokinetics; knockouts; dosimetry; risk assessment

Journal Article.  4926 words.  Illustrated.

Subjects: Medical Toxicology ; Toxicology (Non-medical)

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