title: Modulation of CYP1A2 and CYP3A6 catalytic activities by serum from rabbits with a turpentine-induced inflammatory reaction and interleukin 6.
abstract: Inflammatory reactions reduce the activity of cytochrome P450 isoforms. The aim of the study was to determine the mechanisms underlying the decrease in CYP1A2 and CYP3A6 catalytic activities produced by serum from rabbits with a turpentine-induced inflammatory reaction (S(TIIR)) and interleukin 6 (IL-6). S(TIIR) and IL-6 were incubated with cultured primary hepatocytes from control rabbits (H(CONT)), and from rabbits with a turpentine-induced inflammatory reaction (H(TIIR)) in the absence or presence of pyrrolidine dithiocarbamate (PDTC), an antioxidant and inhibitor of nuclear factor kappaB transcription; 2'-amino-3'-methoxyflavone (PD98059), an inhibitor of extracellular signal-related kinase (Erk1/2); 4-(4-fluorophenyl)-2-(4-methylsulfinylphenyl)-5-(4-pyridyl)1H-imidazole (SB203580), an inhibitor of p38MAPK; Nomega-nitro-L-arginine methyl ester, an inhibitor of nitric-oxide synthase 2 (NOS2); the combination of PDTC, PD98059, and SB203580; and genistein, an inhibitor of Janus-associated protein tyrosine kinase (JAK). After 4 and 24 h of incubation of H(CONT) with S(TIIR) and IL-6, CYP1A2 activity was reduced without changes in expression; the reduction in activity was partially prevented by the inhibition of JAK, Erk1/2, and NOS2. In H(CONT), S(TIIR) and IL-6 did not affect CYP3A6 activity; however, PDTC reduced CYP3A6 activity by 40 and 80% after 4 and 24 h of incubation. In H(TIIR), S(TIIR) and IL-6 reduced both CYP1A2 and CYP3A6 activities; this decrease is partially prevented by inhibitors of protein tyrosine kinases, Erk1/2, and NOS2. In H(TIIR), SB203580 increased CYP3A6 activity in a dose-dependent manner without changes in protein expression. These results show that the signal transduction pathways mediating the decrease in CYP1A2 and 3A6 activity, produced by S(TIIR) and IL-6, involve JAK, Erk1/2, and NOS2.
authors.affiliation: Département de pharmacologie, Local R-412, Faculté de médecine, Université de Montréal, Québec, Canada, H3C 3J7.
authors.forename: Oksana
authors.initials: O
authors.lastname: Kourylko
authors.forename: Caroline
authors.initials: C
authors.lastname: Fradette
authors.forename: Mathieu
authors.initials: M
authors.lastname: Arcand
authors.forename: Patrick
authors.initials: P
authors.lastname: du Souich
mesh_terms: D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases / Q000037:antagonists & inhibitors* / Q000378:metabolism; D002384:Catalysis / Q000187:drug effects; D002478:Cells, Cultured; D019388:Cytochrome P-450 CYP1A2 / Q000378:metabolism; D065609:Cytochrome P-450 CYP1A2 Inhibitors; D004305:Dose-Response Relationship, Drug; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005419:Flavonoids / Q000494:pharmacology; D019833:Genistein / Q000494:pharmacology; D022781:Hepatocytes / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D007093:Imidazoles / Q000494:pharmacology; D007106:Immune Sera / Q000494:pharmacology*; D007249:Inflammation / Q000097:blood* / Q000139:chemically induced / Q000276:immunology; D015850:Interleukin-6 / Q000494:pharmacology*; D008297:Male; D019950:Mitogen-Activated Protein Kinase 1 / Q000037:antagonists & inhibitors; D019331:NG-Nitroarginine Methyl Ester / Q000494:pharmacology; D019001:Nitric Oxide Synthase / Q000037:antagonists & inhibitors; D011725:Pyridines / Q000494:pharmacology; D011817:Rabbits; D015398:Signal Transduction / Q000187:drug effects; D014425:Turpentine / Q000008:administration & dosage / Q000633:toxicity
chemical_list: D065609:Cytochrome P-450 CYP1A2 Inhibitors; D004791:Enzyme Inhibitors; D005419:Flavonoids; D007093:Imidazoles; D007106:Immune Sera; D015850:Interleukin-6; D011725:Pyridines; C120960:pyridine-2,6-bis(thiocarboxylic acid); D019833:Genistein; D019001:Nitric Oxide Synthase; D001189:Aryl Hydrocarbon Hydroxylases; D019388:Cytochrome P-450 CYP1A2; C100638:cytochrome P-450 CYP3A6 (rabbit); D019950:Mitogen-Activated Protein Kinase 1; C093642:SB 203580; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one; D019331:NG-Nitroarginine Methyl Ester; D014425:Turpentine