title: Enhancement and inhibition of mutation by o-vanillin in Escherichia coli.
abstract: 2-Hydroxy-3-methoxybenzaldehyde (omicron-vanillin), the antimutagenic effect of which has been reported on mutagenesis induced by 4-nitroquinoline 1-oxide (4NQO) in Escherichia coli WP2s, enhanced N-methyl-N'-nitro-N-nitrosoguanidine (MNNG)-induced mutagenesis in the same strain. A remarkable enhancement of mutagenesis provoked by N-methyl-N-nitrosourea (MNU) was also observed by the addition of omicron-vanillin. No enhancing effect was observed on mutagenesis induced by other mutagens such as methyl methanesulfonate (MMS), dimethylsulfate, N-ethyl-N'-nitro-N-nitrosoguanidine (ENNG), N-ethyl-N-nitrosourea (ENU), ethyl methanesulfonate, diethylsulfate, 4NQO and furylfuramide (AF-2). On the contrary, omicron-vanillin greatly suppressed AF-2- and 4NQO-induced mutagenesis and showed a slight suppressing effect against mutagenesis induced by MMS, ENNG and ENU. One possible explanation for the enhancing effect of omicron-vanillin on the mutagenesis induced by MNNG or MNU in E. coli WP2s may be inhibition of an inducible adaptive response. Among 7 derivatives of omicron-vanillin, 2-hydroxy-3-ethoxy-benzaldehyde, omicron-hydroxybenzaldehyde and m-methoxybenzaldehyde showed an enhancing effect on MNNG-induced mutagenesis.
authors.affiliation: Institute of Environmental Toxicology, Tokyo, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Watanabe
authors.forename: T
authors.initials: T
authors.lastname: Ohta
authors.forename: Y
authors.initials: Y
authors.lastname: Shirasu
mesh_terms: D001547:Benzaldehydes / Q000494:pharmacology*; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics*; D008769:Methylnitronitrosoguanidine / Q000494:pharmacology*; D009153:Mutagens / Q000494:pharmacology*; D009154:Mutation; D013329:Structure-Activity Relationship
chemical_list: D001547:Benzaldehydes; D009153:Mutagens; C060843:2-vanillin; D008769:Methylnitronitrosoguanidine