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Effect of glutathione and uridine 5'-diphosphoglucuronic acid on mutagenesis by benzo[a]pyrene and aflatoxin B1 in the Salmonella/microsome assay



Effect of glutathione and uridine 5'-diphosphoglucuronic acid on mutagenesis by benzo[a]pyrene and aflatoxin B1 in the Salmonella/microsome assay



Mutation Research 83(1): 15-24



In the Salmonella/microsome plate or liquid assay, the addition of glutathione (GSH) and uridine 5'-diphosphoglucuronic acid (UDPGA), both cofactors for GSH-S-transferases or UDPGA-transferases, altered the rat-liver microsome-mediated mutagenesis of benzo[a]pyrene (BP) and aflatoxin B1 (AFB). With either BP or AFB, an increased, unchanged or decreased number of revertant colonies of S. typhimurium was observed, depending on the substrate concentration, the source of rat-liver 9000 X g supernatant (S9), the time of incubation and the type of mutagenicity test (liquid or plate assay). Several factors responsible for quantitative changes in the pattern of BP and AFB metabolites under various assay conditions in vitro, which alter the overall mutagenic activity of the parent compound, are discussed.

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Accession: 042909524

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PMID: 6268971


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