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Nuclear receptors orchestrate detoxification pathways
Jayanta Roy-Chowdhury1, Joseph Locker, Namita Roy-Chowdhury
1Albert Einstein College of Medicine, Bronx, NY 10461, USA.
Developmental Cell
|May 10, 2003
Abstract:
Two nuclear receptors of xenobiotic drugs, PXR and CAR, are central regulators of detoxification enzymes. New studies extend the role of these receptors to a natural detoxification process. They coordinate induction of proteins for storage, glucuronidation, and canalicular transport of bilirubin.
Insights
New research reveals that pregnane X receptor (PXR) and constitutive androstane receptor (CAR) regulate natural detoxification. These nuclear receptors coordinate bilirubin processing, including storage, glucuronidation, and transport.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- Nuclear receptors pregnane X receptor (PXR) and constitutive androstane receptor (CAR) are established regulators of xenobiotic detoxification enzymes.
- Their precise roles in natural endogenous detoxification pathways are less understood.
Purpose of the Study:
- To investigate the involvement of PXR and CAR in the natural detoxification process of bilirubin.
- To elucidate the mechanisms by which these receptors coordinate bilirubin metabolism and transport.
Main Methods:
- The study likely involved molecular biology techniques to analyze gene and protein expression.
- Assays to measure bilirubin levels and transport activity in cellular or animal models were probably employed.
Main Results:
- PXR and CAR were found to extend their regulatory roles beyond xenobiotics to natural detoxification processes.
- These receptors were shown to coordinate the induction of key proteins involved in bilirubin storage, glucuronidation, and canalicular transport.
Conclusions:
- PXR and CAR are critical regulators of endogenous bilirubin detoxification.
- These findings expand the known physiological functions of PXR and CAR in maintaining metabolic homeostasis.