Abstract:
:The nuclear pregnane X receptor (PXR) and constitutive androstane receptor (CAR) play central roles in protecting the body against environmental chemicals (xenobiotics). PXR and CAR are activated by a wide range of xenobiotics and regulate cytochrome P450 and other genes whose products are involved in the detoxification of these chemicals. In this report, we have used receptor-selective agonists together with receptor-null mice to identify PXR and CAR target genes in the liver and small intestine. Our results demonstrate that PXR and CAR regulate overlapping but distinct sets of genes involved in all phases of xenobiotic metabolism, including oxidative metabolism, conjugation, and transport. Among the murine genes regulated by PXR were those encoding PXR and CAR. We provide evidence that PXR regulates a similar program of genes involved in xenobiotic metabolism in human liver. Among the genes regulated by PXR in primary human hepatocytes were the aryl hydrocarbon receptor and its target genes CYP1A1 and CYP1A2. These findings underscore the importance of these two nuclear receptors in defending the body against a broad array of potentially harmful xenobiotics.
journal_name
Mol Pharmacoljournal_title
Molecular pharmacologyauthors
Maglich JM,Stoltz CM,Goodwin B,Hawkins-Brown D,Moore JT,Kliewer SAdoi
10.1124/mol.62.3.638keywords:
subject
Has Abstractpub_date
2002-09-01 00:00:00pages
638-46issue
3eissn
0026-895Xissn
1521-0111journal_volume
62pub_type
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