title: Desmutagenic and bio-antimutagenic activity of docosahexaenoic acid and eicosapentaenoic acid in cultured Chinese hamster V79 cells.
abstract: The antimutagenic activities of docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) were examined by studying their effects on induction of 6-thioguanine (6TG)-resistant mutations by ethyl methanesulfonate (EMS) in cultured Chinese hamster V79 cells. DRA had a remarkable inhibitory effect against the cytotoxicity of EMS, when cells were simultaneously-treated with EMS, showing a blocking or scavenging activity of DHA in reduction of surviving fraction of cells. DHA had not so significant effect, when cells were treated before and after treatment with EMS. On the other hand, EPA had marked inhibiting effects against cytotoxicity of EMS, when cells were treated with EPA, before, simultaneous and after treatment with EMS. Against the induction of mutations by EMS, an antimutagenic activity of DHA was found when cells were pre-treated, simultaneously-treated or post-treated with DHA. EPA was also effective in reducing EMS-induced 6TG-resistant mutations when the cells were treated using the three different treatment procedures described above. The results suggest that in cultured Chinese hamster V79 cells, DHA and EPA may have both desmutagenic activity, which inactivates EMS chemically and/or enzymatically and bio-antimutagenic activity which suppresses mutation fixation after DNA is damaged by EMS.
authors.affiliation: National Institute of Genetics, Mishima, 411-8540, Shizuoka, Japan. ytakada@lab.nig.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Kuroda
authors.forename: N
authors.initials: N
authors.lastname: Shima
authors.forename: K
authors.initials: K
authors.lastname: Yazawa
authors.forename: K
authors.initials: K
authors.lastname: Kaji
mesh_terms: D000818:Animals; D016587:Antimutagenic Agents / Q000494:pharmacology*; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D003114:Colony-Forming Units Assay; D006224:Cricetinae; D004281:Docosahexaenoic Acids / Q000494:pharmacology*; D015118:Eicosapentaenoic Acid / Q000494:pharmacology*; D005020:Ethyl Methanesulfonate / Q000037:antagonists & inhibitors / Q000633:toxicity; D009152:Mutagenicity Tests; D013866:Thioguanine / Q000494:pharmacology
chemical_list: D016587:Antimutagenic Agents; D004281:Docosahexaenoic Acids; D005020:Ethyl Methanesulfonate; D015118:Eicosapentaenoic Acid; D013866:Thioguanine