title: Dimethylarsinic acid, a main metabolite of inorganic arsenics, has tumorigenicity and progression effects in the pulmonary tumors of A/J mice.
abstract: The pulmonary tumorigenicity of dimethylarsinic acid (DMAA), a main metabolite of inorganic arsenics, was examined in A/J mice fed with drinking water containing DMAA for 25 and 50 weeks. Mice fed with 400 ppm DMAA for 50 weeks produced more pulmonary tumors than untreated mice (mean number per animal 1.36 versus 0.50; P < 0.05). Histological examination revealed that the number of mice which bore adenocarcinomas or papillary adenomas correlated with the concentration of DMAA given (untreated versus 400 ppm; P = 0.002), suggesting that DMAA could promote tumorigenic processes. These results are consistent with the epidemiological studies on the pulmonary carcinogenesis of arsenics and suggest that DMAA alone can act as a carcinogen in mice.
authors.affiliation: Department of Pathology, Yokohama City University School of Medicine, Yokohama, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Hayashi
authors.forename: M
authors.initials: M
authors.lastname: Kanisawa
authors.forename: K
authors.initials: K
authors.lastname: Yamanaka
authors.forename: T
authors.initials: T
authors.lastname: Ito
authors.forename: N
authors.initials: N
authors.lastname: Udaka
authors.forename: H
authors.initials: H
authors.lastname: Ohji
authors.forename: K
authors.initials: K
authors.lastname: Okudela
authors.forename: S
authors.initials: S
authors.lastname: Okada
authors.forename: H
authors.initials: H
authors.lastname: Kitamura
mesh_terms: D000818:Animals; D002101:Cacodylic Acid / Q000633:toxicity*; D002273:Carcinogens / Q000633:toxicity*; D011905:Genes, ras; D008175:Lung Neoplasms / Q000139:chemically induced* / Q000473:pathology; D008297:Male; D051379:Mice
chemical_list: D002273:Carcinogens; D002101:Cacodylic Acid