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- W2077100959 abstract "Methylazoxymethanol (MAM) is the short-lived toxic and carcinogenic aglycone of cycasin, a natural component of the cycad plant. In the present study, the stable acetate ester of MAM, MAM acetate, was tested in combination with porcine liver esterase and Salmonella typhimurium His G46 to study the comparative mutagenicity of this compound in the presence of rat hepatic alcohol dehydrogenase (ADH), aldehyde dehydrogenase (ALDH), and rat liver microsomes. In the presence of rat liver microsomes and an NADPH-generating system, mutagenicity of MAM acetate was not significantly altered. However, addition of rat liver 105,000g supernatant fraction and/or NAD+ significantly increased the number of his+ revertants above control. A concentration-dependent increase in mutagenicity of MAM acetate was observed for NAD+ from 50 to 200 microM, while NADP+ caused a decrease in mutagenicity of MAM acetate in this same concentration range. Pyrazole (100-500 microM) had no significant effect on mutagenicity of MAM acetate in the presence of rat liver 105,000g supernatant, while disulfiram at 500 microM resulted in a significant decrease in mutagenicity of MAM acetate. The results of this study implicate ALDH as essential in activation of MAM acetate to a mutagenic species in this system, while the role of ADH and microsomes appears to be minimal." @default.
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- W2077100959 date "1991-01-01" @default.
- W2077100959 modified "2023-10-16" @default.
- W2077100959 title "Mutagenicity of methylazoxymethanol acetate in the presence of alcohol dehydrogenase, aldehyde dehydrogenase, and rat liver microsomes inSalmonella typhimurium his G46" @default.
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- W2077100959 doi "https://doi.org/10.1002/em.2850180302" @default.
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