Regular articles

Examination of in vivo mutagenicity of sodium arsenite and dimethylarsinic acid in gpt delta rats

Masaki Fujioka , Min Gi , Satoko Kawachi , Kumiko Tatsumi , Naomi Ishii , Kenichiro Doi , Anna Kakehashi , Hideki Wanibuchi


Received May 11, 2016,Revised July 19, 2016, Accepted July 21, 2016, Available online July 30, 2016

Volume 28,2016,Pages 125-130

Arsenic is a well-known human bladder and liver carcinogen, but its exact mechanism of carcinogenicity is not fully understood. Dimethylarsinic acid (DMAV) is a major urinary metabolite of sodium arsenite (iAsIII) and induces urinary bladder cancers in rats. DMAV and iAsIII are negative in in vitro mutagenicity tests. However, their in vivo mutagenicities have not been determined. The purpose of present study is to evaluate the in vivo mutagenicities of DMAV and iAsIII in rat urinary bladder epithelium and liver using gpt delta F344 rats. Ten-week old male gpt delta F344 rats were randomized into 3 groups and administered 0, 92 mg/L DMAV, or 87 mg/L iAsIII (each 50 mg/L As) for 13 weeks in the drinking water. In the mutation assay, point mutations are detected in the gpt gene by 6-thioguanine selection (gpt assay) and deletion mutations are identified in the red/gam genes by Spi selection (Spi assay). Results of the gpt and Spi assays showed that DMAV and iAsIII had no effects on the mutant frequencies or mutation spectrum in urinary bladder epithelium or liver. These findings indicate that DMAV and iAsIII are not mutagenic in urinary bladder epithelium or liver in rats.

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