title: Synergistic effect of diethylstilbestrol on the mutagenicity of 2-acetylaminofluorene and N-hydroxy-acetylaminofluorene in the Salmonella assay system.
abstract: Salmonella typhimurium, TA-1538, was used to investigate the mutagenic potential of N-2-acetylaminofluorene (2-AAF), N-hydroxy-N-2-acetylaminofluorene (N-OH-2-AAF) and diethylstilbestrol (DES) individual and in combination. In the presence of an induced or uninduced rat liver metabolizing system (S-9), the histidine requiring strain of bacteria was reverted to prototrophy by the aromatic amines but not by the synthetic estrogen. However, when DES was combined with 2-AAF or N-OH-I-AAF in the presence of the induced S-9 fraction, the number of revertant colonies was increased 2- to 4-fold above the levels obtained with the aromatic amines alone. The synergistic effect of DES, a non-mutagen, on the mutagenicity of these aromatic amines was observed only when a 3-methylcholanthrene induced rat liver S-9 fraction was used as the source of mammalian enzymes. When uninduced mouse or rat liver S-9 fractions were used in this test system, an inhibitory effect rather than an enhancing effect was observed.
mesh_terms: D015073:2-Acetylaminofluorene / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology*; D000818:Animals; D001711:Biotransformation / Q000187:drug effects; D004054:Diethylstilbestrol / Q000494:pharmacology*; D004353:Drug Evaluation, Preclinical; D004357:Drug Synergism; D005260:Female; D006881:Hydroxyacetylaminofluorene / Q000378:metabolism / Q000494:pharmacology*; D066298:In Vitro Techniques; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008297:Male; D008748:Methylcholanthrene / Q000494:pharmacology; D051379:Mice; D009153:Mutagens; D051381:Rats
chemical_list: D009153:Mutagens; D006881:Hydroxyacetylaminofluorene; D008748:Methylcholanthrene; D004054:Diethylstilbestrol; D015073:2-Acetylaminofluorene