title: Effects of serum testosterone level with buserelin on the activities of drug and testosterone hydroxylase and on the content of a male-specific form of cytochrome P-450 in male rats.
abstract: The effects of administration of buserelin, a synthetic agonist of lutenizing hormone-releasing hormone (LH-RH), on the content of P-450-male, a male specific form of cytochrome P-450, and the activities of drug and testosterone hydroxylases were examined in liver microsomes of male rats. Administration of buserelin resulted in a decrease in the serum level of testosterone in a dose-dependent manner. Similar decreases were seen in the activities of aminopyrine N-demethylase, 7-propoxycoumarin O-depropylase and testosterone 2 alpha- and 16 alpha-hydroxylases, but not in the activity of aniline p-hydroxylase. Thus, correlations were observed between the serum level of testosterone and the activities of drug and testosterone hydroxylases except for aniline p-hydroxylase. These results indicate that the drug and testosterone hydroxylases are affected sensitively and sequentially by the changes in the testosterone levels in the body.
authors.affiliation: Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Ohi
authors.forename: M
authors.initials: M
authors.lastname: Iwasaki
authors.forename: M
authors.initials: M
authors.lastname: Komori
authors.forename: T
authors.initials: T
authors.lastname: Miura
authors.forename: M
authors.initials: M
authors.lastname: Kitada
authors.forename: S
authors.initials: S
authors.lastname: Hayashi
authors.forename: T
authors.initials: T
authors.lastname: Kamataki
mesh_terms: D000633:Aminopyrine N-Demethylase / Q000032:analysis; D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases; D002064:Buserelin / Q000494:pharmacology*; D003577:Cytochrome P-450 Enzyme System / Q000032:analysis*; D004305:Dose-Response Relationship, Drug; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D012737:Sex Factors; D013250:Steroid Hydroxylases / Q000032:analysis*; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone; D003577:Cytochrome P-450 Enzyme System; D013250:Steroid Hydroxylases; D001189:Aryl Hydrocarbon Hydroxylases; C022724:testosterone 7-alpha-hydroxylase, hamster; D000633:Aminopyrine N-Demethylase; D002064:Buserelin