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      Induction of rat hepatic mixed-function oxidases by acetone and other physiological ketones: Their role in diabetes-induced changes in cytochrome P450 proteins

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      Xenobiotica
      Informa UK Limited

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          Dealkylation of pentoxyresorufin: a rapid and sensitive assay for measuring induction of cytochrome(s) P-450 by phenobarbital and other xenobiotics in the rat.

          The O-dealkylation of pentoxyresorufin (7-pentoxyphenoxazone) by rat liver microsomes was examined. The reaction appeared highly specific for certain phenobarbital inducible forms of cytochrome P-450 and was increased 95- to 140-fold by animal pretreatment with phenobarbital (75 mg/kg/day, four ip injections) and approximately 50-fold by Aroclor 1254 (500 mg/kg, one ip injection) while animal pretreatment with 3-methylcholanthrene (50 mg/kg/day, three ip injections) resulted in less than a 2-fold increase over the rate detected in control microsomes. It was observed that this activity, in microsomes for Aroclor-pretreated rats, was dependent on O2 and was inhibited by metyrapone and SKF 525-A, indicative of cytochrome(s) P-450 mediation in the reaction. When antibodies directed against purified cytochrome(s) P-450s were employed to inhibit the pentoxyresorufin O-dealkylation reaction, antibodies to P-450PB-B greatly inhibited the reaction (greater than 90%), while antibodies to P-450PB-C or P-450PB/PCN-E had minimal effects. Assay of hepatic microsomes from rats which were pretreated with varying doses of phenobarbital (0.9-75 mg/kg/day, four ip injections) indicated that while aminopyrine-N-demethylase activity was induced only 2-fold at the maximum dose (75 mg/kg/day), pentoxyresorufin O-dealkylase activity was induced approximately 140-fold at this dose and approximately 4-fold by a dose of phenobarbital as low as 0.9 mg/kg.
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            Identification of the cytochrome P-450 induced by macrolide antibiotics in rat liver as the glucocorticoid responsive cytochrome P-450p

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              Multiple forms of hepatic cytochrome P-450. Purification, characterisation and comparison of a novel clofibrate-induced isozyme with other major forms of cytochrome P-450

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                Author and article information

                Journal
                Xenobiotica
                Xenobiotica
                Informa UK Limited
                0049-8254
                1366-5928
                September 22 2008
                September 22 2008
                : 22
                : 12
                : 1441-1450
                Article
                10.3109/00498259209056694
                4ec91b08-bfab-4477-b016-cc8b8b9d386b
                © 2008
                History

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