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Tissue Distribution and Urinary Excretion of Dimethylated Arsenic and Its Metabolites in Dimethylarsinic acid- or Arsenate-treated Rats - MCEARD
Citation:
Adair, B. M., T. MOORE, S. CONKLIN, JOHN T. CREED, D. C. WOLF, AND D. J. THOMAS. Tissue Distribution and Urinary Excretion of Dimethylated Arsenic and Its Metabolites in Dimethylarsinic acid- or Arsenate-treated Rats - MCEARD. TOXICOLOGY AND APPLIED PHARMACOLOGY. Academic Press Incorporated, Orlando, FL, 222(2):235-242, (2007).
Impact/Purpose:
This manuscript describes the distribution of arsenic-containing metabolites in rats that received inorganic arsenic (as arsenate) or dimethylarsinic acid in drinking water for 14 days. The distribution of metabolites was examined in tissues of these rats and in urine. In addition to the usual methylated metabolites, this study also quantified the levels of novel thioarsenical metabolites in urine.
Description:
Adult female Fisher 344 rats received drinking water containing 0, 4, 40, 100, or 200 parts per million of dimethylarsinic acid or 100 parts per million of arsenate for 14 days. Urine was collected during the last 24 h of exposure. Tissues were then taken for analysis of dimethylated and trimethylated arsenicals; urines were analyzed for these arsenicals and their thiolated derivatives. In dimethylarsinic acid-treated rats, highest concentrations of dimethylated arsenic were found in blood. In lung, liver, and kidney, concentrations of dimethylated arsenic exceeded those of trimethylated species; in urinary bladder and urine, trimethylated arsenic predominated. Dimethylthioarsinic acid and trimethylarsine sulfide were present in urine of dimethylarsinic acid-treated rats. Concentrations of dimethylated arsenicals were similar in most tissues of dimethylarsinic acidand arsenate-treated rats, including urinary bladder which is the target for dimethylarsinic acid-induced carcinogenesis in the rat. Mean concentration of dimethylated arsenic was significantly higher (Pb0.05) in urine of dimethylarsinic acid-treated rats than in arsenate-treated rats, suggesting a difference between treatment groups in the flux of dimethylated arsenic through urinary bladder. Concentrations of trimethylated arsenic concentrations were consistently higher in dimethylarsinic acid-treated rats than in arsenate-treated rats; these differences were significant (Pb0.05) in liver, urinary bladder, and urine. Concentrations of dimethylthioarsinic acid and trimethylarsine sulfide were higher in urine from dimethylarsinic acid-treated rats than from arsenate-treated rats. Dimethylarsinic acid is extensively metabolized in the rat, yielding significant concentrations of trimethylated species and of thiolated derivatives. One or more of these metabolites could be the species causing alterations of cellular function that lead to tumors in the urinary bladder.
