title: Sex differences in the diabetes-induced modulation of rat hepatic cytochrome P450 proteins.
abstract: Sex differences in the diabetes-induced changes in hepatic cytochrome P450 proteins were investigated in rats treated with streptozotocin. Changes in specific cytochrome P450 proteins were monitored using diagnostic substrates and immunologically utilizing specific polyclonal antibodies. When expressed in terms of nmoles of total cytochrome P450, ethoxyresorufin O-deethylase activity was increased by treatment with streptozotocin, the extent of induction being the same in the two sexes. In contrast, lauric acid hydroxylase and ethylmorphine N-demethylase activities were induced only in the male rat. Finally, p-nitrophenol hydroxylase and pentoxyresorufin O-dealkylase were enhanced by the same treatment in both sexes, the effect being more pronounced in the male. These findings indicate that sex-specific changes in certain cytochrome P450 proteins exist in response to insulin-dependent diabetes but these cannot, however, be ascribed to sex differences in the severity of diabetes induced by streptozotocin since the degrees of hyperketonaemia and hyperglycaemia were the same in the two sexes. These are likely to reflect sex-specific differences in growth hormone and triglyceride levels in the diabetic animals.
authors.affiliation: Division of Toxicology, School of Biological Sciences, University of Surrey, Guildford, U.K.
authors.forename: C R
authors.initials: CR
authors.lastname: Barnett
authors.forename: S
authors.initials: S
authors.lastname: Rudd
authors.forename: P R
authors.initials: PR
authors.lastname: Flatt
authors.forename: C
authors.initials: C
authors.lastname: Ioannides
mesh_terms: D000818:Animals; D019363:Cytochrome P-450 CYP1A1; D019362:Cytochrome P-450 CYP2B1; D019392:Cytochrome P-450 CYP2E1; D042926:Cytochrome P-450 CYP4A; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D003921:Diabetes Mellitus, Experimental / Q000201:enzymology*; D005037:Ethylmorphine-N-Demethylase / Q000378:metabolism; D005260:Female; D008099:Liver / Q000201:enzymology*; D008297:Male; D006899:Mixed Function Oxygenases / Q000378:metabolism; D010088:Oxidoreductases / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D012737:Sex Factors
chemical_list: D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D010088:Oxidoreductases; D019392:Cytochrome P-450 CYP2E1; D019363:Cytochrome P-450 CYP1A1; D019362:Cytochrome P-450 CYP2B1; D042926:Cytochrome P-450 CYP4A; D005037:Ethylmorphine-N-Demethylase