title: Strain differences in hepatic cytochrome P450 1A and 3A expression between Sprague-Dawley and Wistar rats.
abstract: Expression of hepatic cytochrome P450 (CYP) isoforms was compared in Sprague-Dawley (SD) and Wistar (WI) rats, which are commonly used strains in preclinical studies. Basal CYP1A1, CYP1A2, and CYP3A2 mRNA levels were higher in WI rats than in SD rats (by 8-, 3- and 2-fold, respectively). Treatment with phenobarbital, a potent CYP inducer, increased the predominance of expression of these three mRNAs in WI rats (by 26-, 4-, and 2-fold, respectively) along with the predominance of increased microsomal total P450 contents and smooth-surface endoplasmic reticulum in the centrilobular hepatocytes. CYP1A enzymatic activity was also higher in WI rats than in SD rats. No strain differences were observed in phenobarbital induction of CYP2B1/2, CYP2C6, or CYP3A1. CYP3A2 mRNA was more strongly induced by dexamethasone, a typical inducer of CYP3A, together with CYP3A1 mRNA, in WI rats than in SD rats (by 2-fold), whereas the CYP1A1 and CYP1A2 mRNA expression induced by beta-naphtoflavone, a typical inducer of CYP1A, did not differ between the two strains. Furthermore, WI rats exhibited predominantly arylhydrocarbon receptor, pregnane X receptor, and constitutive androstane receptor mRNAs, responsible for CYP1A or CYP3A induction, with phenobarbital or dexamethasone induction. In conclusion, significant, predominant expression of hepatic CYP1A and CYP3A mRNAs in WI rats was observed, possibly related to nuclear receptor-mediated induction. Considering the pharmacokinetic and toxicological importance of CYP1A and CYP3A, different outcomes might arise depending on the rat strains used in preclinical studies of drugs metabolized typically or mainly by both isoforms.
authors.affiliation: Toxicology Research Laboratory, R & D, Kissei Pharmaceutical Co., Ltd, Nagano, Japan. tomoyuki_kishida@pharm.kissei.co.jp
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Kishida
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Muto
authors.forename: Morimichi
authors.initials: M
authors.lastname: Hayashi
authors.forename: Masaru
authors.initials: M
authors.lastname: Tsutsui
authors.forename: Satoru
authors.initials: S
authors.lastname: Tanaka
authors.forename: Makoto
authors.initials: M
authors.lastname: Murakami
authors.forename: Junji
authors.initials: J
authors.lastname: Kuroda
mesh_terms: D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D019363:Cytochrome P-450 CYP1A1 / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D019388:Cytochrome P-450 CYP1A2 / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D051544:Cytochrome P-450 CYP3A; D003580:Cytochromes; D003907:Dexamethasone / Q000494:pharmacology; D015971:Gene Expression Regulation, Enzymologic; D022781:Hepatocytes / Q000187:drug effects / Q000648:ultrastructure; D008099:Liver / Q000201:enzymology*; D008297:Male; D008565:Membrane Proteins / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D008862:Microsomes, Liver / Q000201:enzymology; D010634:Phenobarbital / Q000494:pharmacology; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D017208:Rats, Wistar; D013045:Species Specificity; D019324:beta-Naphthoflavone / Q000494:pharmacology
chemical_list: D003580:Cytochromes; D008565:Membrane Proteins; D012333:RNA, Messenger; D019324:beta-Naphthoflavone; D003907:Dexamethasone; D001189:Aryl Hydrocarbon Hydroxylases; C017170:Cyp1a2 protein, rat; C465260:Cyp3a2 protein, rat; D019363:Cytochrome P-450 CYP1A1; D019388:Cytochrome P-450 CYP1A2; D051544:Cytochrome P-450 CYP3A; D010634:Phenobarbital