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Effect of CAR activation on selected metabolic pathways in normal and hyperlipidemic mouse liverRežen, Tadeja ...BACKGROUND: Detoxification in the liver involves activation of nuclear receptors, such as the constitutive androstane receptor (CAR), which regulate downstream genes of xenobiotic metabolism. ... Frequently, the metabolism of endobiotics is also modulated, resulting in potentially harmful effects. We therefore used 1,4-Bisš2-(3,5-dichloropyridyloxy)đ benzene (TCPOBOP) to study the effect of CAR activation on mouse hepatic transcriptome and lipid metabolome under conditions of diet-induced hyperlipidemia. RESULTS: Using gene expression profiling with a dedicated microarray, we show that xenobioticmetabolism, PPAR alpha and adipocytokine signaling, and steroid synthesis are the pathways most affected by TCPOBOP in normal and hyperlipidemic mice. TCPOBOP-induced CAR activation prevented the increased hepatic and serum cholesterol caused by feeding mice a diet containing 1% cholesterol. We show that this is due to increased bile acid metabolism and up-regulated removal of LDL, even though TCPOBOP increased cholesterol synthesis under conditions of hyperlipidemia. Up-regulation of cholesterol synthesis was not accompanied by an increase in mature SREBP2 protein. As determined by studies in CAR -/- mice, up-regulation of cholesterol synthesis is however CAR-dependent; and no obvious CAR binding sites were detected in promoters of cholesterogenic genes. TCPOBOP also affected serum glucose and triglyceride levels and other metabolic processes in the liver, irrespective of the diet. CONCLUSIONS: Our data show that CAR activation modulates hepatic metabolism by lowering cholesterol and glucose levels, through effects on PPAR alpha and adiponectin signaling pathways, and by compromising liver adaptations to hyperlipidemia.Source: BMC genomics [Elektronski vir]. - ISSN 1471-2164 (članek 384, Vol. 10, no. 1, 2009, 15 str.)Type of material - article, component part ; adult, seriousPublish date - 2009Language - englishCOBISS.SI-ID - 25838041
Author
Režen, Tadeja |
Tamasi, V. |
Lovgren, A. Sandblom |
Bjorkhem, Ingemar |
Meyer, Urs |
Rozman, Damjana, 1960-
Topics
Liver |
Metabolism |
Androstanes |
Hyperlipidemia |
Metabolism |
Dietary Fats |
Benzene Derivatives |
Mice |
Gene Expression |
Cholesterol |
Binding Sites |
Promoter Regions (Genetics) |
Jetra |
Hiperlipidemija |
Benzolski derivati |
Androstani |
Dietne maščobe |
Holesterol |
Gensko izražanje |
Miši |
Mesta vezave |
Promoterska področja (genetika)
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Database name | Field | Year |
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Režen, Tadeja | 22459 |
Tamasi, V. | ![]() |
Lovgren, A. Sandblom | ![]() |
Bjorkhem, Ingemar | ![]() |
Meyer, Urs | ![]() |
Rozman, Damjana, 1960- | 06013 |
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