title: An in vivo and in vitro comparison of CYP gene induction in mice using liver slices and quantitative RT-PCR.
abstract: The scope of this study was to compare in vitro and in vivo cytochrome P450 (CYP) gene induction in mice, using liver slices as an in vitro model. We have chosen to study mice to be able to better interpret CYP induction during long-term safety studies in this species. Mouse liver slices were incubated with beta-naphthoflavone (betaNF), phenobarbital (PB) or dexamethasone (DEX) for 24 h. In addition, in an in vivo study, mice were treated with the same compounds for three days. The mRNA expression of cyp1a1, cyp1a2, cyp2b10 and cyp3a11, which are important for drug metabolism and inducible by xenobiotics, were investigated in vivo and in vitro by real-time quantitative reverse transcription-polymerase chain reaction (RT-PCR). Both in mouse liver slices and in vivo, betaNF was found to be a potent inducer of cyp1a1 and to a lesser extent of cyp1a2. All three compounds induced cyp2b10 mRNA levels, while the cyp3a11 mRNA level was induced only by DEX. Overall, these data demonstrated a good predictive in vitro-in vivo correlation of CYP induction.
authors.affiliation: Preclinical Development, Nerviano Medical Sciences, Viale Pasteur 10, 20014 Nerviano (MI), Italy. marcella.martignoni@nervianoms.com
authors.forename: Marcella
authors.initials: M
authors.lastname: Martignoni
authors.forename: Ruben
authors.initials: R
authors.lastname: de Kanter
authors.forename: Pietro
authors.initials: P
authors.lastname: Grossi
authors.forename: Grazia
authors.initials: G
authors.lastname: Saturno
authors.forename: Elena
authors.initials: E
authors.lastname: Barbaria
authors.forename: Mario
authors.initials: M
authors.lastname: Monshouwer
mesh_terms: D000818:Animals; D001681:Biological Assay; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics / Q000378:metabolism*; D003907:Dexamethasone / Q000494:pharmacology; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D066298:In Vitro Techniques; D008099:Liver / Q000201:enzymology*; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D010634:Phenobarbital / Q000494:pharmacology; D012333:RNA, Messenger / Q000378:metabolism; D015533:Transcriptional Activation; D019324:beta-Naphthoflavone / Q000494:pharmacology
chemical_list: D012333:RNA, Messenger; D019324:beta-Naphthoflavone; D003907:Dexamethasone; D003577:Cytochrome P-450 Enzyme System; D010634:Phenobarbital