title: Chronic toxicity and carcinogenicity studies of 1-methylnaphthalene in B6C3F1 mice.
abstract: The carcinogenic potential of 1-methylnaphthalene (1-MN), a compound which exists widely in the environment, was investigated in B6C3F1 mice. Groups of 50 male and 50 female mice were given diets containing 0, 0.075, or 0.15% 1-MN for 81 weeks. Both treatment groups developed pulmonary alveolar proteinosis at high incidence, with 46.0 and 34.7% of females and 46.0 and 38.0% of males, respectively, being affected. Total lipid and phospholipid levels in sera and monocytes in peripheral blood were also significantly increased in 1-MN-treated female and male mice in contrast with control values. The incidences of bronchiolar/alveolar adenomas in the lungs of male mice given both 0.075 or 0.15% 1-MN were 26.0 and 24.0%, respectively, in both cases significantly increased in contrast with the 4.1% observed for control males. However, neither dose dependence nor significant difference in the incidences of bronchiolar/alveolar carcinomas between 1-MN-treated and control male mice was observed. The incidences of other tumors also were similar in both 1-MN-treated and control groups. The results of the present experiment thus suggested a possible weak carcinogenic potential of 1-MN to the lung of male but not female B6C3F1 mice.
authors.affiliation: Department of Oncological Pathology, Nara Medical College, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Murata
authors.forename: A
authors.initials: A
authors.lastname: Denda
authors.forename: H
authors.initials: H
authors.lastname: Maruyama
authors.forename: Y
authors.initials: Y
authors.lastname: Konishi
mesh_terms: D000284:Administration, Oral; D000818:Animals; D001769:Blood; D001835:Body Weight / Q000187:drug effects; D015197:Carcinogenicity Tests; D002273:Carcinogens / Q000633:toxicity*; D005247:Feeding Behavior / Q000187:drug effects; D005260:Female; D008297:Male; D051379:Mice; D009281:Naphthalenes / Q000633:toxicity*; D009374:Neoplasms, Experimental / Q000139:chemically induced; D009929:Organ Size / Q000187:drug effects
chemical_list: D002273:Carcinogens; D009281:Naphthalenes; C025968:1-methylnaphthalene