PMID: 2109655May 1, 1990Paper

Metabolic activation of aflatoxin B1 and 2-amino-3-methylimidazo[4,5-f]-quinoline by human adult and fetal livers

Cancer Research
M KitadaT Kamataki

Abstract

The mutagenic activation of promutagens by human adult and fetal livers was investigated using the umu test system. Among the promutagens studied, aflatoxin B1 (AFB1) and 2-amino-3-methyl-imidazo[4,5-f] quinoline (IQ) were efficiently activated to mutagens by both adult and fetal livers. 7,8-Benzoflavone inhibited the activation of IQ by fetal livers, but the inhibition observed in fetal livers was much less than that observed in adult livers. Antibodies to P450HM1 (P450111A4) and P450HFLa markedly inhibited the activation of AFB1 by adult and fetal livers, respectively. The formation of genotoxic product(s) from IQ in human adult livers was almost completely inhibited by anti-P448H (P4501A2) antibodies but not by anti-P450HM1 antibodies, whereas that in fetal livers was inhibited by both anti-P450HFLa and anti-P450IA2 antibodies. P450HFLa catalyzed the mutagenic activation of both AFB1 and IQ in a reconstituted system. On the contrary, P450HM1 catalyzed the mutagenic activation of AFB1 but not IQ. A preparation of cytochrome P450 partially purified from human fetal livers and cross-reactive with anti-P450IA2 antibodies was found to be active for mutagenic activation of IQ in a reconstituted system. These results indicate that ...Continue Reading

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