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The Nuclear Pregnane X Receptor: A Key Regulator of Xenobiotic Metabolism

Kliewer, Steven A., Goodwin, Bryan, Willson, Timothy M.·2002·Endocrine Reviews

Abstract

The nuclear pregnane X receptor (PXR; NR1I2) is an important component of the body's adaptive defense mechanism against toxic substances including foreign chemicals (xenobiotics). PXR is activated by a large number of endogenous and exogenous chemicals including steroids, antibiotics, antimycotics, bile acids, and the herbal antidepressant St. John's wort. Elucidation of the three-dimensional structure of the PXR ligand binding domain revealed that it has a large, spherical ligand binding cavity that allows it to interact with a wide range of hydrophobic chemicals. Thus, unlike other nuclear receptors that interact selectively with their physiological ligands, PXR serves as a generalized sensor of hydrophobic toxins. PXR binds as a heterodimer with the 9-cis retinoic acid receptor (NR2B) to DNA response elements in the regulatory regions of cytochrome P450 3A monooxygenase genes and a number of other genes involved in the metabolism and elimination of xenobiotics from the body. Although PXR evolved to protect the body, its activation by a variety of prescription drugs represents the molecular basis for an important class of harmful drug-drug interactions. Thus, assays that detect PXR activity will be useful in developing safer prescription drugs.

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Metadata

Authors
Kliewer, S. A., Goodwin, B., & Willson, T. M.
Venue
Endocrine Reviews
Published
2002-10-01
Volume
23
Issue
5
Pages
687-702
ISSN
  • 0163-769X (ISSN-L)
  • 1945-7189
OpenAlex
W2032693719
Cited by
921
References
5
FWCI
16.64
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: The Nuclear Pregnane X Receptor: A Key Regulator of Xenobiotic Metabolism. https://app.cochat.ai/papers/10.1210/er.2001-0038
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Kliewer, S. A., Goodwin, B., & Willson, T. M. (2002). The Nuclear Pregnane X Receptor: A Key Regulator of Xenobiotic Metabolism. Endocrine Reviews. https://doi.org/10.1210/er.2001-0038

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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