title: New Screening Criteria Setting on Evaluation of Cytochrome P450 Induction Using HepaRG Cells with Multiplex Branched DNA Technologies in Early Drug Discovery.
abstract: Cytochrome P450 (CYP) enzymes are induced by some therapeutic drugs, leading to interactions reducing drug plasma concentrations. Recently, an assessment of CYP induction using messenger RNA (mRNA) levels has shown advantages over measurement of enzymatic activity; it has a larger dynamic range of induction and enables us to measure the intrinsic induction potential of time-dependent CYP inhibitors. In order to minimize the late-stage attrition of new chemical entities (NCE), it is important to evaluate CYP induction potency at mRNA levels in the early stage of drug development.
  
  
  
  The aim of this study is to establish a new screening method to evaluate induction potency of CYP1A2, CYP2B6, and CYP3A4 at mRNA levels.
  
  
  
  QuantiGene Plex 2.0 Assay using HepaRG cells.
  
  
  
  The results from our new CYP induction assay system corresponded well to the already reported results obtained by using human hepatocytes. The induction potency was evaluated by calculating the concentration of test compounds that gives 10% of positive control response (R10), which is measurable even when full dose-response curves cannot be obtained. Compared with the evaluation of CYP induction in human hepatocytes, the response at R10 in HepaRG cells suggested the possibility of exhibiting induction potency for corresponding CYPs. Interestingly, the results with our in-house 109 compounds showed that several compounds induced CYP1A2 or CYP2B6 expression without upregulation of CYP3A4.
  
  
  
  Our developed assay system, as well as the R10 value, is useful for evaluating the CYP induction potency of NCE in early drug discovery.
authors.affiliation: Advanced Drug Research Laboratories, Sohyaku Innovative Research Division, Mitsubishi Tanabe Pharma Corporation, 2-2-50 Kawagishi, Toda-shi, Saitama 335-8505, Japan;.
authors.forename: Akira
authors.initials: A
authors.lastname: Ogasawara
authors.forename: Nao
authors.initials: N
authors.lastname: Torimoto
authors.forename: Naoki
authors.initials: N
authors.lastname: Tsuda
authors.forename: Fumika
authors.initials: F
authors.lastname: Aohara
authors.forename: Rikiya
authors.initials: R
authors.lastname: Ohashi
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Yamada
authors.forename: Hideki
authors.initials: H
authors.lastname: Taniguchi
mesh_terms: D002460:Cell Line; D019388:Cytochrome P-450 CYP1A2 / Q000096:biosynthesis / Q000235:genetics; D065702:Cytochrome P-450 CYP2B6 / Q000096:biosynthesis / Q000235:genetics; D051544:Cytochrome P-450 CYP3A / Q000096:biosynthesis / Q000235:genetics; D065693:Cytochrome P-450 Enzyme Inducers / Q000494:pharmacology; D015195:Drug Design; D055808:Drug Discovery / Q000379:methods; D004790:Enzyme Induction / Q000187:drug effects*; D022781:Hepatocytes / Q000187:drug effects* / Q000201:enzymology; D006801:Humans; D008099:Liver / Q000187:drug effects* / Q000201:enzymology; D012333:RNA, Messenger / Q000378:metabolism; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D065693:Cytochrome P-450 Enzyme Inducers; D012333:RNA, Messenger; D019388:Cytochrome P-450 CYP1A2; D065702:Cytochrome P-450 CYP2B6; D051544:Cytochrome P-450 CYP3A