The impact of pregnane X receptor activation on liver fibrosis.
@article{Wright2006TheIO,
title={The impact of pregnane X receptor activation on liver fibrosis.},
author={Matthew C. Wright},
journal={Biochemical Society transactions},
year={2006},
volume={34 Pt 6},
pages={
1119-23
}
}The PXR (pregnane X receptor) is a nuclear receptor transcription factor that is activated by a range of endobiotics and xenobiotics. The activated PXR modulates the transcription of genes in hepatocytes (the main functional cell of the liver) associated with endobiotic and xenobiotic uptake, metabolism and excretion. However, activation of the PXR also inhibits a deleterious response of the liver to chronic damage--that of fibrosis. The antifibrogenic mode of action is mediated through changes…
25 Citations
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References
SHOWING 1-10 OF 19 REFERENCES
The nuclear receptor PXR is a lithocholic acid sensor that protects against liver toxicity
- BiologyProceedings of the National Academy of Sciences of the United States of America
- 2001
It is proposed that PXR serves as a physiological sensor of LCA, and coordinately regulates gene expression to reduce the concentrations of this toxic bile acid, and suggest that PxR agonists may prove useful in the treatment of human cholestatic liver disease.
Pregnane X receptor activators inhibit human hepatic stellate cell transdifferentiation in vitro.
- Biology, MedicineGastroenterology
- 2006
The pregnane X receptor is transcriptionally functional in human hepatic stellate cells and activators inhibit transdifferentiation and proliferation and may be an effective target for antifibrotic therapy.
An Orphan Nuclear Receptor Activated by Pregnanes Defines a Novel Steroid Signaling Pathway
- Biology, ChemistryCell
- 1998
Pregnenolone-16alpha-carbonitrile inhibits rodent liver fibrogenesis via PXR (pregnane X receptor)-dependent and PXR-independent mechanisms.
- Biology, MedicineThe Biochemical journal
- 2005
The data suggest that the PXR is antifibrogenic in rodents in vivo and that a P XR-independent target for PX R activators exists in hepatic stellate cells that also functions to inhibit fibrosis.
The human orphan nuclear receptor PXR is activated by compounds that regulate CYP3A4 gene expression and cause drug interactions.
- BiologyThe Journal of clinical investigation
- 1998
The identification of a human (h) orphan nuclear receptor, termed the pregnane X receptor (PXR), that binds to a response element in the CYP3A4 promoter and is activated by a range of drugs known to induce CYP 3A4 expression is reported.
Humanized xenobiotic response in mice expressing nuclear receptor SXR
- Biology, ChemistryNature
- 2000
It is shown that targeted disruption of the mouse PXR gene abolishes induction of CYP3A by prototypic inducers such as dexamethasone or pregnenolone-16α-carbonitrile, and that SXR/PXR genes encode the primary species-specific xeno-sensors that mediate the adaptive hepatic response, and may represent the critical biochemical mechanism of human xenoprotection.
Mechanism of action of the antifibrogenic compound gliotoxin in rat liver cells
- Biology, MedicineHepatology
- 2004
Data suggest that gliotoxin stimulates the apoptosis of HSCs through a specific thiol redox‐dependent interaction with the ANT, and further understanding of this mechanism of cell death will aid in finding therapeutics that specifically stimulate HSC apoptosis in the liver, a promising approach to antifibrotic therapy.
Effect of the adrenal 11-beta-hydroxylase inhibitor metyrapone on human hepatic cytochrome P-450 expression: induction of cytochrome P-450 3A4.
- Biology, MedicineDrug metabolism and disposition: the biological fate of chemicals
- 2000
Metyrapone treatment is unlikely to result in the induction of CyP1A1 but may induce the expression of CYP3A4 in humans.
Glucocorticoid receptor-independent transcriptional induction of cytochrome P450 3A1 by metyrapone and its potentiation by glucocorticoid.
- Biology, MedicineMolecular pharmacology
- 1996
Examination of membrane-bound dexamethasone binding activity indicates that binding activity is detectable in 90- but not 21-day-old rat liver microsomes, which suggests that membranes-bound glucocorticoid binding site activity is not involved in the transcriptional activation of CYP3A1 expression.
Fibrogenic effect of oxidative stress on rat hepatic stellate cells
- Biology, MedicineHepatology
- 1998
H hepatocytes undergoing oxidative stress release factors which are fibrogenic for HSC, thereby, confirming what has been only hypothesized in vivo and providing a useful target for the evaluation of inhibitors of this pathway for the treatment of hepatic fibrosis.


