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Statins Increase Plasminogen Activator Inhibitor Type 1 Gene Transcription through a Pregnane X Receptor Regulated
Frederick M Stanley1, Kathryn M Linder2, Timothy J Cardozo1
1Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, New York, United States of America; Laura and Isaac Perlmutter Cancer Center, NYU Langone Medical Center, New York, New York, United States of America.
Statins like atorvastatin activate the PAI-1 promoter by binding to the pregnane X receptor (PXR). This interaction, involving PXR-RXR heterodimers, influences PAI-1 gene expression and has implications for cardiovascular disease.
Area of Science:
- Molecular Biology
- Pharmacology
- Genetics
Background:
- Plasminogen activator inhibitor type 1 (PAI-1) is crucial for inflammation and wound healing, with dysregulation linked to heart disease.
- The PAI-1 promoter is influenced by various factors, including cytokines, growth factors, steroids, and oxidative stress.
Purpose of the Study:
- To characterize the statin-responsive nuclear hormone response element in the PAI-1 promoter.
- To investigate the role of the pregnane X receptor (PXR) in statin-mediated PAI-1 expression.
Main Methods:
- Deletion and directed mutagenesis of the PAI-1 promoter region.
- Computational molecular docking of statins with PXR.
- Gal4 DNA binding domain fusion protein experiments.
- Chromatin immunoprecipitation (ChIP) assays.
Main Results:
- A direct repeat (DR) element at -269/-255 was identified as a repressor of basal PAI-1 transcription.
- Statins (atorvastatin, mevastatin, rosuvastatin) activated PXR and enhanced PAI-1 promoter activity.
- PXR and RXR heterodimers were shown to bind to the identified PAI-1 promoter region.
Conclusions:
- The characterized DR element is a PXR-responsive element that mediates statin effects on PAI-1.
- Statins activate PAI-1 expression through PXR, highlighting a novel mechanism in cardiovascular regulation.
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