title: Antimutagenicity of sodium selenite in Chinese hamster V79 cells exposed to azoxymethane, methylmethansulphonate and hydrogen peroxide.
abstract: In the last 10 years, there is an increasing interest in selenium (Se) because of its environmental, biological, and toxicological importance, and in particular, because of its antioxidant properties. However, inspite of extensive studies, the optimal concentration of Se to be used for its beneficial effects in not yet known. In addition, the mechanisms of Se antioxidant property require further study. We report on the effects of various mutagens/carcinogens such as azoxymethane, methylmethanesulphonate, and hydrogen peroxide on Chinese V79 hamster cells, in presence of sodium selenite in the concentration of 0.5 microM. We found that Se reduced the genotoxic effect of these mutagens/carcinogens. We also investigated enzymatic activities of glutathione peroxidase, catalase, superoxide dismutase, and glutathione S-transferase, in order to understand the Se involvement in the detoxification of free radicals. Sodium selenite increased the activities of glutathione peroxidase and catalase.
authors.affiliation: Institute of Mutagenesis and Differentiation, CNR Research Area, Via Moruzzi, Pisa 56124, Italy. g.brozetti@imd.pi.cnr.it
authors.forename: Giorgio
authors.initials: G
authors.lastname: Bronzetti
authors.forename: Marco
authors.initials: M
authors.lastname: Cini
authors.forename: Leonardo
authors.initials: L
authors.lastname: Caltavuturo
authors.forename: Roberto
authors.initials: R
authors.lastname: Fiorio
authors.forename: Clara Della
authors.initials: CD
authors.lastname: Croce
mesh_terms: D000818:Animals; D016587:Antimutagenic Agents / Q000494:pharmacology*; D001397:Azoxymethane / Q000633:toxicity*; D002374:Catalase / Q000378:metabolism; D002460:Cell Line; D002869:Chromosome Aberrations; D006224:Cricetinae; D003412:Cricetulus; D004305:Dose-Response Relationship, Drug; D005978:Glutathione / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D005982:Glutathione Transferase / Q000187:drug effects / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000633:toxicity*; D008741:Methyl Methanesulfonate / Q000633:toxicity*; D009152:Mutagenicity Tests; D009153:Mutagens / Q000633:toxicity; D018038:Sodium Selenite / Q000494:pharmacology*; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D016587:Antimutagenic Agents; D009153:Mutagens; D008741:Methyl Methanesulfonate; D006861:Hydrogen Peroxide; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D005982:Glutathione Transferase; D005978:Glutathione; D018038:Sodium Selenite; D001397:Azoxymethane