Skip Navigation
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

National Institute of Environmental Health Sciences

Use this QR code to view the newest version of this document
Use this QR code to view the newest version of this document

Your Environment. Your Health.

Publication Detail

Title: Species difference in the regulation of cytochrome P450 2S1: lack of induction in rats by the aryl hydrocarbon receptor agonist PCB126.

Authors: Wang, Bingxuan; Robertson, Larry W; Wang, Kai; Ludewig, Gabriele

Published In Xenobiotica, (2011 Dec)

Abstract: CYP2S1 is an evolutionarily conserved, mainly extra-hepatic member of the CYP2 family and proposed to be regulated by the aryl hydrocarbon receptor (AhR). The present study explores AhR's regulation of CYP2S1 in male Sprague Dawley rats using PCB126 (3,3',4,4',5-pentachlorobiphenyl), the most potent AhR agonist among the PCBs. Additionally, CYP2S1 expression was examined after treatments with the classic CYP-inducers β-naphthoflavone (β-NF, AhR activator), phenobarbital (PB, CAR activator) and dexamethasone (Dex, PXR activator). CYP2S1 and CYP1A1/2, CYP1B1, CYP2B and CYP3A mRNAs were measured in liver, lung, spleen, stomach, kidney, and thymus at different time points. Constitutive CYP2S1 was expressed at comparable levels to other CYPs with the highest expression levels in stomach, kidney and lung. CYP2S1 mRNA was only non-significantly elevated by β-NF in liver tissues. PCB126 did not increase CYP2S1 mRNA in any organ and at any time point examined despite a significant induction of CYP1 genes. PCB126 reduced CYP2S1 mRNA by 40% (not significant) from the 7th post-exposure day in thymus. PB and Dex had no effect on CYP2S1 mRNA levels. These observations show that in this model CYP2S1 is not, or only weakly, regulated by AhR and not induced by CAR or PXR activators.

PubMed ID: 21970748 Exiting the NIEHS site

MeSH Terms: Animals; Body Weight/drug effects; Cytochrome P-450 Enzyme System/biosynthesis*; Cytochrome P-450 Enzyme System/genetics*; Enzyme Induction/drug effects; Gene Expression Regulation, Enzymologic/drug effects; Liver/drug effects; Liver/enzymology; Lung/drug effects; Lung/enzymology; Male; Organ Size/drug effects; Organ Specificity/drug effects; Organ Specificity/genetics; Polychlorinated Biphenyls/pharmacology*; RNA, Messenger/genetics; RNA, Messenger/metabolism; Rats; Rats, Sprague-Dawley; Receptors, Aryl Hydrocarbon/agonists*; Receptors, Aryl Hydrocarbon/metabolism; Species Specificity; Thymus Gland/drug effects; Thymus Gland/metabolism; Time Factors

Back
to Top