title: Exposure of rats to exogenous endocrine disruptors 17alpha-ethinylestradiol and benzo(a)pyrene and an estrogenic hormone estradiol induces expression of cytochromes P450 involved in their metabolism.
abstract: OBJECTIVE
  The term "endocrine disruptor" (ED) is used for compounds that mimic or antagonize the effects of endogenous hormones. Synthetic estrogen 17α-ethinylestradiol (EE2) and a human carcinogen benzo[a]pyrene (BaP) are assigned as exogenous endocrine disruptors and an estrogenic hormone estradiol is a natural endogenous disruptor. Here, the potency of these three disruptors administered to rats individually and in combination to induce expression of cytochrome P450 (CYP) enzymes involved in their own metabolism (CYP1A1, 2C and 3A) in vivo was investigated.
  
  
  METHODS
  Changes in CYP protein expression after exposure of rats to BaP, EE2 or estradiol were analyzed by Western blotting. Using the HPLC method, CYP1A1, 2C and 3A specific activities in hepatic microsomes isolated from exposed rats were analyzed.
  
  
  RESULTS
  Whereas exposure to BaP induces expression of CYP1A1 protein and its marker activity (Sudan I oxidation) in liver, kidney and lung of rats, no significant induction of this CYP and its enzyme activity was produced by EE2 and estradiol. Treatment of BaP in combination with EE2 and/or estradiol decreased the BaP-mediated CYP1A1 induction in liver of exposed rats. BaP also induces CYP2C11 protein in rat liver and kidney, but does not increase its enzyme activity measured as testosterone 16α-hydroxylation. The enzyme activity of another enzyme of the 2C subfamily, CYP2C6, diclofenac 4'-hydroxylation, is even decreased by BaP. The CYP2C11 protein expression and/or its activity are also increased in liver of rats treated with EE2 and estradiol, but its expression is significantly decreased in lung. The CYP2C6 activity is also elevated by treatment of rats with EE2 and estradiol administered individually as well as in their combination. Whereas only a slight increase in CYP3A protein expression was found by BaP in rat liver, its enzyme activity, testosterone 6β-hydroxyalation, increased significantly in this organ. In contrast, no effect or even a decrease in CYP3A expression and its enzyme activity was produced by EE2 and estradiol in rats exposed to these compounds.
authors.affiliation: Department of Biochemistry, Faculty of Science, Charles University, Prague 2, Czech Republic.
authors.forename: Lucie
authors.initials: L
authors.lastname: Borek-Dohalska
authors.affiliation: Department of Biochemistry, Faculty of Science, Charles University, Prague 2, Czech Republic.
authors.forename: Zuzana
authors.initials: Z
authors.lastname: Klusonova
authors.affiliation: Department of Biochemistry, Faculty of Science, Charles University, Prague 2, Czech Republic.
authors.forename: Jana
authors.initials: J
authors.lastname: Holecova
authors.affiliation: Department of Biochemistry, Faculty of Science, Charles University, Prague 2, Czech Republic.
authors.forename: Marketa
authors.initials: M
authors.lastname: Martinkova
authors.affiliation: Department of Biochemistry, Faculty of Science, Charles University, Prague 2, Czech Republic.
authors.forename: Frantisek
authors.initials: F
authors.lastname: Barta
authors.affiliation: Department of Biochemistry, Faculty of Science, Charles University, Prague 2, Czech Republic.
authors.forename: Helena
authors.initials: H
authors.lastname: Dracinska
authors.affiliation: Institute of Microbiology, Academy of Science of the Czech Republic, Prague 4, Czech Republic.
authors.forename: Tomas
authors.initials: T
authors.lastname: Cajthaml
authors.affiliation: Department of Biochemistry, Faculty of Science, Charles University, Prague 2, Czech Republic.
authors.forename: Marie
authors.initials: M
authors.lastname: Stiborova
mesh_terms: D000818:Animals; D001564:Benzo(a)pyrene / Q000494:pharmacology*; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D052244:Endocrine Disruptors / Q000494:pharmacology*; D004958:Estradiol / Q000494:pharmacology*; D004967:Estrogens / Q000494:pharmacology*; D004997:Ethinyl Estradiol / Q000494:pharmacology*; D008297:Male; D008862:Microsomes, Liver / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar
chemical_list: D052244:Endocrine Disruptors; D004967:Estrogens; D001564:Benzo(a)pyrene; D004997:Ethinyl Estradiol; D004958:Estradiol; D003577:Cytochrome P-450 Enzyme System