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• W2000724014 abstract "Pre-treatment, co-treatment, and post-treatment procedures were comparatively used in order to assess the modulation of mutagenicity in S. typhimurium his- strains. Pre-treatment of bacteria with sodium selenite had no effect on sodium azide mutagenicity. Irrespective of the procedure used neither selenite nor caffeine had any influence on the S9-mediated mutagenicity of aflatoxin B1. In contrast, the mutagenicity of N-methyl-N-nitrosourea (MNU) and N-methyl-N'-nitro-N- nitrosoguanidine (MNNG) was variably affected, depending on the sequence of exposures of target bacterial cells to mutagens and modulators. In particular, pre-treatment of bacteria with either selenite or caffeine or their combination generally resulted in a potentiation of MNU and MNNG mutagenicity. However, co-incubation of these alkylating agents and test modulators with bacterial cells yielded an evident inhibition of mutagenicity, the methylxanthine being more effective in this case. Caffeine exhibited an an antimutagenic effect towards MNU also when assayed in a post-treatment procedure. Thus, in dependence on the test conditions, selenite and caffeine could act in the same mutagenicity assay as co-mutagens, antimutagens or agents without effect on mutagenesis. These opposite trends reflect the complexity of the mechanisms of action of both mutagens and modulators tested, and underscore the variable outcome of their interactions, also depending on topological and chronological factors. The data reported emphasize the need for a multiple methodological approach in studies investigating the modulation of mutagenicity." @default.
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• W2000724014 date "1992-10-01" @default.
• W2000724014 modified "2023-09-28" @default.
• W2000724014 title "Effects of sodium selenite and caffeine on mutagenesis induced by N-methyl-N-nitrosourea, N-methyl-N′-nitro-N-nitrosoguanidine and aflatoxin B1 in S. typhimurium" @default.
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• W2000724014 doi "https://doi.org/10.1016/0027-5107(92)90213-l" @default.
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