Constitutive androstane receptor activation stimulates faecal bile acid excretion and reverse cholesterol transport in mice. J Hepatol 2011 Jul;55(1):154-61
Date
12/15/2010Pubmed ID
21145854DOI
10.1016/j.jhep.2010.10.029Scopus ID
2-s2.0-79958786379 (requires institutional sign-in at Scopus site) 39 CitationsAbstract
BACKGROUND & AIMS: The constitutive androstane receptor (CAR) is a nuclear receptor expressed in the liver and involved in xenobiotic metabolism. The aim of this study was to assess whether pharmacological CAR activation could affect neutral sterol and bile acid elimination under conditions of cholesterol overload.
METHODS: Wild type, Car-/-, ApoE-/-, and low-density lipoprotein receptor (Ldlr)-/- mice fed a western-type diet were treated with the CAR agonist TCPOBOP.
RESULTS: CAR activation was associated with a decrease in faecal cholesterol output related to the repression of the Abcg5/g8 cholesterol transporters. In contrast, TCPOBOP treatment induced a marked increase (up to three fold, p<0.01) in the elimination of faecal bile acids. In the liver, it was related to the coordinated induction of genes involved in synthesis, sulfo-conjugation, and excretion of bile acids as well as the repression of the ileal apical sodium-dependent bile acid transporter. Importantly, cholesterol accumulation was reduced in the liver of TCPOBOP-treated animals. In all cases, TCPOBOP had no effect in Car-/- mice. To determine directly whether CAR activation could affect the elimination of endogenous cholesterol, kinetic studies were performed with high-density lipoproteins (HDL) labelled with (3)H-cholesteryl esters. We observed that TCPOBOP-treated mice excreted more HDL cholesterol-derived bile acids in their faeces. Finally, long-term CAR activation was associated with decreases in cholesterol content of the whole body and atherosclerosis susceptibility.
CONCLUSIONS: CAR is involved in the control of cholesterol and bile acid homeostasis, increasing reverse cholesterol transport under hyperlipidemic conditions.
Author List
Sberna AL, Assem M, Gautier T, Grober J, Guiu B, Jeannin A, Pais de Barros JP, Athias A, Lagrost L, Masson DAuthor
Mahfoud Assem PharmD Associate Professor in the School of Pharmacy Administration department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
ATP-Binding Cassette TransportersAnimals
Apolipoproteins E
Atherosclerosis
Bile Acids and Salts
Biological Transport, Active
Cholesterol
Cholesterol, HDL
Feces
Gene Expression
Homeostasis
Hyperlipidemias
Lipoproteins
Liver
Mice
Mice, Inbred C57BL
Mice, Knockout
Pyridines
Receptors, Cytoplasmic and Nuclear
Receptors, LDL
