title: Upregulation of CYP2e1 and CYP3a activities in histamine-deficient histidine decarboxylase gene targeted mice.
abstract: Histamine is a biogenic amine with multiple physiological functions. Its importance in allergic inflammation is well characterized; moreover, it plays a role in the regulation of gastric acid production, various hypothalamic functions, such as food uptake, and enhancing TH2 balance during immune responses. Using histidine decarboxylase gene targeted (HDC(-/-)) BALB/c mice, we studied the effect of the absence of histamine on four cytochrome p450 enzyme activities. Their selective substrates were measured: ethoxyresorufin O-dealkylase activity of CYP1A, pentoxyresorufin O-dealkylase activity of CYP2B, chlorzoxazone 6-hydroxylase activity of CYP2E1 and ethylmorphine N-demethylase activity of CYP3A. The results indicate a significant elevation of CYP2E1 and CYP3A activities, however, no change in CYP1A and CYP2B activities was seen in HDC targeted mice compared to wild type controls with identical genetic backgrounds.
authors.affiliation: Department of Genetics, Cell and Immunobiology, Semmelweis University 1089, Nagyvárad tér 4, Budapest 1089, Hungary.
authors.forename: Viola
authors.initials: V
authors.lastname: Tamási
authors.forename: A Kristóf
authors.initials: AK
authors.lastname: Fülöp
authors.forename: Krisztina
authors.initials: K
authors.lastname: Hegyi
authors.forename: Katalin
authors.initials: K
authors.lastname: Monostory
authors.forename: András
authors.initials: A
authors.lastname: Falus
mesh_terms: D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases / Q000096:biosynthesis*; D019392:Cytochrome P-450 CYP2E1 / Q000096:biosynthesis*; D051544:Cytochrome P-450 CYP3A; D018014:Gene Transfer Techniques; D006632:Histamine / Q000378:metabolism*; D006640:Histidine Decarboxylase / Q000235:genetics*; D007249:Inflammation; D008099:Liver / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D010089:Oxidoreductases, N-Demethylating / Q000096:biosynthesis*; D015854:Up-Regulation
chemical_list: D006632:Histamine; D019392:Cytochrome P-450 CYP2E1; D001189:Aryl Hydrocarbon Hydroxylases; D051544:Cytochrome P-450 CYP3A; D010089:Oxidoreductases, N-Demethylating; D006640:Histidine Decarboxylase