title: Utility of long-term cultured human hepatocytes as an in vitro model for cytochrome p450 induction.
abstract: Cytochrome P450 (P450) induction may have considerable implications for drug therapy. Therefore, understanding the induction potential of a new chemical entity at an early stage in discovery is crucial to reduce the risk of failure in the clinic and help the identification of noninducing chemical structures. Availability of human viable tissue often limits evaluation of induction potential in human hepatocytes. A solution is to increase the time period during which the hepatocytes remain viable. In this study we have investigated the induction of several P450 isozymes in long-term cultured hepatocytes compared with short-term cultured hepatocytes from the same individuals. Short- and long-term cultured primary hepatocytes isolated from each individual were cultured in a 96-well format and treated for 24 h with a range of prototypical P450 inducers and Merck Research Laboratories compounds. CYP3A4, 1A1, 1A2, 2B6, and 2C9 mRNA levels were measured using quantitative real-time reverse transcriptase-polymerase chain reaction (TaqMan) from the same cultured hepatocyte wells. CYP3A4, 1A1, 1A2, 2B6, and 2C9 were shown to be inducible in long-term cultured hepatocytes. The -fold induction varied between donors, and between short- and long-term cultured hepatocytes from the same donor. However, this variability can be controlled by normalizing data from each hepatocyte preparation to a positive control. The use of long-term cultured hepatocytes on 96-well plates has proven to be sensitive, robust, and convenient for assessing P450 induction potential of new compound entities during the drug discovery process.
authors.affiliation: Department of Medicinal Chemistry (Drug Metabolism Section), Merck Sharp and Dohme Research Laboratories, Harlow, Essex, United Kingdom. georgina.meneses-lorente@roche.com
authors.forename: Georgina
authors.initials: G
authors.lastname: Meneses-Lorente
authors.forename: Christine
authors.initials: C
authors.lastname: Pattison
authors.forename: Claire
authors.initials: C
authors.lastname: Guyomard
authors.forename: Christophe
authors.initials: C
authors.lastname: Chesné
authors.forename: Robert
authors.initials: R
authors.lastname: Heavens
authors.forename: Alan P
authors.initials: AP
authors.lastname: Watt
authors.forename: Bindi
authors.initials: B
authors.lastname: Sohal
mesh_terms: D001189:Aryl Hydrocarbon Hydroxylases / Q000096:biosynthesis; D002478:Cells, Cultured; D019363:Cytochrome P-450 CYP1A1 / Q000096:biosynthesis; D019388:Cytochrome P-450 CYP1A2 / Q000096:biosynthesis; D065702:Cytochrome P-450 CYP2B6; D065729:Cytochrome P-450 CYP2C9; D051544:Cytochrome P-450 CYP3A; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis* / Q000235:genetics; D004790:Enzyme Induction; D022781:Hepatocytes / Q000201:enzymology*; D006801:Humans; D010089:Oxidoreductases, N-Demethylating / Q000096:biosynthesis; D012333:RNA, Messenger / Q000032:analysis
chemical_list: D012333:RNA, Messenger; D003577:Cytochrome P-450 Enzyme System; C450260:CYP2C9 protein, human; D065729:Cytochrome P-450 CYP2C9; D001189:Aryl Hydrocarbon Hydroxylases; C504573:CYP1A2 protein, human; C585599:CYP2B6 protein, human; D019363:Cytochrome P-450 CYP1A1; D019388:Cytochrome P-450 CYP1A2; D065702:Cytochrome P-450 CYP2B6; D051544:Cytochrome P-450 CYP3A; C510163:CYP3A4 protein, human; D010089:Oxidoreductases, N-Demethylating