title: Expression and activity of CYP2E1 in circulating lymphocytes are not altered in diabetic individuals.
abstract: Cytochrome P4502E1 (CYP2E1) plays an important role in ROS production thus favouring accelerated membrane lipid peroxidation. This isoform is strongly expressed in the liver but it can be also found in lymphocytes. As such, lymphocyte may provide a non-invasive accessible pool for screening CYP2E1 expression in man. We have, therefore, analysed CYP2E1 expression and activity in lymphocyte microsomes from 12 healthy controls, 11 type 1 and 12 type 2 diabetic subjects by using Western blot and enzymatic activities. Immunoblotting did not show difference among CYP2E1 protein bands in controls, type 1 and type 2 diabetics. To assess CYP2E1 activity we used the 7-ethoxy-4-trifluoromethylcoumarin (7-EFC), as a fluorescent substrate. The rate of deethylation of 7-EFC from controls did not differ from type 1 and type 2 diabetic subjects. The lack of any difference in CYP2E1 activity also was confirmed by the NADPH-dependent microsomal lipid peroxidation CCL4-induced assay showing similar peroxidation rates among controls and diabetic subjects. The results show that CYP2E1 expression/activity in lymphocytes is not enhanced in diabetes.
authors.affiliation: Department of Endocrinology and Metabolism, Unit of Diabetes and Metabolism, University of Pisa, Italy.
authors.forename: Laura
authors.initials: L
authors.lastname: Pucci
authors.forename: Vera
authors.initials: V
authors.lastname: Chirulli
authors.forename: Sandra
authors.initials: S
authors.lastname: Marini
authors.forename: Daniela
authors.initials: D
authors.lastname: Lucchesi
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Penno
authors.forename: Pier Giovanni
authors.initials: PG
authors.lastname: Gervasi
authors.forename: Stefano
authors.initials: S
authors.lastname: Del Prato
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Longo
mesh_terms: D000328:Adult; D000368:Aged; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis* / Q000235:genetics; D000072467:Cytochrome P450 Family 2; D003920:Diabetes Mellitus / Q000201:enzymology* / Q000235:genetics; D005260:Female; D015971:Gene Expression Regulation, Enzymologic / Q000502:physiology*; D006801:Humans; D008214:Lymphocytes / Q000201:enzymology*; D008297:Male; D008875:Middle Aged
chemical_list: D003577:Cytochrome P-450 Enzyme System; C110332:CYP2F1 protein, human; D000072467:Cytochrome P450 Family 2