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- W2039040810 abstract "The in vitro effects of α-naphthoflavone on four hepatic mono-oxygenase activities associated with aromatic hydrocarbon responsiveness in the mouse (aryl hydrocarbon hydroxylase, 2-acetylamino-fluorene N-hydroxylase, biphenyl 2-hydroxylase, and biphenyl 4-hydroxylase) were investigated before and after methylcholanthrene treatment of C57BL/6N and DBA/2N mice, rats, hamsters, guinea pigs and rabbits. The electrophoretic pattern of cytochrome P-450 subunits and reduced CO-hemoprotein difference spectra of the microsomal fractions were also studied. Pretreatment of animals with methylcholanthrene caused: (1) a 1.5 to 2 mm hypsochromic shift in the Soret peak of the reduced hemoprotein-CO complexes in liver microsomes from a C57BL/6N mouse, rat, hamster and rabbit; a 0.5-nm hypsochromic shift in the guinea pig and no shift in the DBA/2N mouse; and (2) an increase in cytochrome P-450 apoproteins of the following molecular weights on sodium dodecyl sulfate-polyaerylamide gel electrophoresis: 54,000 and 55,000 in the C57BL/6N mouse; 48,000, 54,000 and 55,000 in the rat; 49,000 and 54,000 in the hamster; and 54,000 and 57,000 in the rabbit; a small increase in the 54,000 band was seen in the DBA/2N mouse and no increase in the guinea pig. In vitro addition of α-naphthoflavone selectively inhibited all four mono-oxygenase activities from the methylcholanthrene-treated C57BL/6N mouse, rat and hamster; 2-acetylaminofluorene N-hydroxylase and biphenyl 4-hydroxylase activities in the rabbit; and aryl hydrocarbon hydroxylase, 2-acetylaminofluorene N-hydroxylase and biphenyl 4-hydroxylase activities in the guinea pig. The addition of α-naphthoflavone enhanced the activities of aryl hydrocarbon hydroxylase and biphenyl 2-hydroxylase in liver microsomes from both control and methylcholanthrenetreated rabbits, but only biphenyl 2-hydroxylase activity was increased in the guinea pig: the activitity of 2-acetylaminofluorene N-hydroxylase was increased in both control and methylcholan-threne-treated DBA/2M mice, but only in the control C57BL/6N mouse. These data indicate that hepatic cytochrome P-448 is composed of multiple cytochromes, which differ among animal species, each catalyzing different mono-oxygenase activities." @default.
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- W2039040810 title "Species differences in the substrate specificity of hepatic cytochrome P-448 From polycyclic hydrocarbon-treated animals" @default.
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- W2039040810 doi "https://doi.org/10.1016/0006-2952(79)90507-0" @default.
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