title: Cytochrome P450 in highly purified suspension of nonparenchymal liver cells.
abstract: Rat liver nonparenchymal cells (NPC) were prepared by pronase digestion and purified on discontinuous gradients on Nycodenz. Morphological and biochemical characterization of cell suspensions showed that they were free of contamination by hepatocytes. We have confirmed the usefulness of pyruvate kinase activity in monitoring the degree of hepatocyte contamination of NPC and we have derived an equation which allows this carry-over to be calculated. Using highly purified suspensions of NPC we have shown that they contain glucose-6-phosphatase in low but detectable levels. Spectrophotometric studies showed that they contain cytochrome P450, with a specific content of 24 +/- 5 pmole mg-1 cell protein. A potential source of error in previous studies was recognized; namely that peroxidase, present in NPC in high concentration, is able to mask the absorption due to cytochrome P450. Both the presence and inducibility of this enzyme in NPC prepared from rats pretreated with phenobarbital or 3-methylcholanthrene have been confirmed using Western blot analysis.
authors.affiliation: Biological Laboratory, University of Kent, Canterbury, UK.
authors.forename: K
authors.initials: K
authors.lastname: Rich
authors.forename: A
authors.initials: A
authors.lastname: Lodola
mesh_terms: D000818:Animals; D015153:Blotting, Western; D003577:Cytochrome P-450 Enzyme System / Q000032:analysis* / Q000096:biosynthesis; D008099:Liver / Q000166:cytology / Q000201:enzymology*; D008297:Male; D008862:Microsomes, Liver / Q000201:enzymology; D051381:Rats
chemical_list: D003577:Cytochrome P-450 Enzyme System