Characterization of ligand-dependent activation of bovine and pig constitutive androstane (CAR) and pregnane X receptors (PXR) with interspecies comparisons

被引:9
作者
Kublbeck, Jenni [1 ,2 ]
Zancanella, Vanessa [3 ]
Prantner, Viktoria [1 ,2 ]
Molnar, Ferdinand [1 ,2 ]
Squires, E. James [4 ]
Dacasto, Mauro [3 ]
Honkakoski, Paavo [1 ,2 ]
Giantin, Mery [3 ]
机构
[1] Univ Eastern Finland, Fac Hlth Sci, Sch Pharm, POB 1627, FI-70211 Kuopio, Finland
[2] Bioctr Kuopio, POB 1627, FI-70211 Kuopio, Finland
[3] Univ Padua, Div Vet Pharmacol & Toxicol, Dept Comparat Biomed & Food Sci, Padua, Italy
[4] Univ Guelph, Dept Anim & Poultry Sci, Guelph, ON N1G 2W1, Canada
基金
芬兰科学院;
关键词
Bovine; cytochrome P450; human; induction; ligand-binding domain; mouse; nuclear receptors; pig; AMINO-ACIDS; STRUCTURAL DETERMINANTS; NUCLEAR RECEPTORS; GENE; MOUSE; IDENTIFICATION; INHIBITION; COMPLEX; TRANSACTIVATION; DEXAMETHASONE;
D O I
10.3109/00498254.2015.1060374
中图分类号
R9 [药学];
学科分类号
1007 ;
摘要
1.Nuclear receptors CAR (NR1I3) and PXR (NR1I2) are major ligand-activated transcriptional regulators of xenobiotic metabolism and disposition and modulators of endobiotic metabolism. Differences in xenobiotic selectivity between the human and rodent receptors are well recognized but there is lack of such information on properties of CAR and PXR in important domestic animals.2.The pig and bovine receptors were cloned and their ligand profiles were systematically compared to corresponding human and mouse forms utilizing a panel of xenobiotics and structural analysis.3.Pig CAR and PXR resemble their human counterparts which can be rationalized by only modest amino acid changes between critical residues of the human ligand-binding pockets (H203Q for CAR, L210V and M243I for PXR).4.In contrast, bovine CAR shows a blunted response to CAR agonists and inverse agonists. These changes are likely due to disruptive mutations at or near critical hydrogen bond-forming residues (N165I, Y326F). The unresponsiveness of bovine PXR to human- and mouse-selective agonists may be related to substitutions at important ligand-contacting residues R410Q and F305V, respectively.5.Our findings have implications for regulation of drug-metabolizing enzymes and transporters and pharmacokinetics in cattle and pigs.
引用
收藏
页码:200 / 210
页数:11
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