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- W1489428344 abstract "Oxidative metabolism of the carcinogen 6-fluorobenzo[c]phenanthrene (6-FB[c]Ph) was compared with that of benzo[c]phenanthrene (B[c]Ph) to elucidate the enhancement of carcinogenicity of B[c]Ph by the 6-fluoro substituent. Liver microsomes from untreated (control), phenobarbital-treated, and 3-methylcholanthrene-treated rats metabolized 6-FB[c]Ph at rates of 3.5, 1.5, and 7.7 nmol of products/nmol of cytochrome P-450/min, respectively. The rates of metabolism of B[c]Ph by the same microsomes were 2.9, 1.6, and 5.5 nmol of products/nmol of cytochrome P-450/min, respectively. Whereas the K-region 5,6-dihydrodiol was the major metabolite of B[c]Ph, the major metabolite of 6-FB[c]Ph was the K-region 7,8-oxide, which underwent slow rearrangement to an oxepin. Thus, the 6-fluoro substituent blocks oxidation at the 5,6-double bond and inhibits hydration of the K-region 7,8-oxide by epoxide hydrolase. Substitution with fluorine at C-6 caused an almost 2.5-fold increase in the percentages of the putative proximate carcinogens, i.e. benzo-ring dihydrodiols with bay-region double bonds, when liver microsomes from 3-methylcholanthrene-treated rats were used. Little or no increase was observed in their formation by liver microsomes from control or phenobarbital-treated rats. Interestingly, liver microsomes from control rats formed almost 3-fold as much 3,4-dihydrodiol as isosteric 9,10-dihydrodiol. The R,R-enantiomers of the 3,4- and 9,10-dihydrodiols and the S,S-enantiomer of the 7,8-dihydrodiol were predominantly formed by all three microsomal preparations." @default.
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- W1489428344 title "Oxidative metabolism of the carcinogen 6-fluorobenzo[c]phenanthrene. Effect of a K-region fluoro substituent on the regioselectivity of cytochromes P-450 in liver microsomes from control and induced rats." @default.
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- W1489428344 doi "https://doi.org/10.1016/s0021-9258(18)68978-1" @default.
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