Hepatic caveolin-1 is enhanced in Cyp27A1/ApoE double knockout mice

Zurkinden, Line, Mansour, Yosef, Rohrbach, Beatrice, Vogt, Bruno, Mistry, Hiten D. and Escher, Genevieve (2016) Hepatic caveolin-1 is enhanced in Cyp27A1/ApoE double knockout mice. FEBS Open Bio, 6 (10). pp. 1025-1035. ISSN 2211-5463

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Sterol 27-hydroxylase (CYP27A1) is involved in bile acid synthesis and cholesterol homoeostasis. Cyp27a1(−/−)/Apolipoprotein E(−/−) double knockout mice (DKO) fed a western diet failed to develop atherosclerosis. Caveolin-1 (CAV-1), the main component of caveolae, is associated with lipid homoeostasis and has regulatory roles in vascular diseases. We hypothesized that liver CAV-1 would contribute to the athero-protective mechanism in DKO mice. Cyp27a1(+/+)/ApoE(−/−) (ApoE KO), Cyp27a1(+/−)/ApoE(−/−) (het), and DKO mice were fed a western diet for 2 months. Atherosclerotic plaque and CAV-1 protein were quantified in aortas. Hepatic Cav-1 mRNA was assessed using qPCR, CAV-1 protein by immunohistochemistry and western blotting. Total hepatic and plasma cholesterol was measured using chemiluminescence. Cholesterol efflux was performed in RAW264.7 cells, using mice plasma as acceptor. CAV-1 protein expression in aortas was increased in endothelial cells of DKO mice and negatively correlated with plaque surface (P < 0.05). In the liver, both CAV-1 protein and mRNA expression doubled in DKO, compared to ApoE KO and het mice (P < 0.001 for both) and was negatively correlated with total hepatic cholesterol (P < 0.05). Plasma from DKO, ApoE KO and het mice had the same efflux capacity. In the absence of CYP27A1, CAV-1 overexpression might have an additional athero-protective role by partly overcoming the defect in CYP27A1-mediated cholesterol efflux.

Item Type: Article
RIS ID: https://nottingham-repository.worktribe.com/output/974930
Schools/Departments: University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Medicine > Division of Child Health, Obstetrics and Gynaecology
Identification Number: https://doi.org/10.1002/2211-5463.12123
Depositing User: Mistry, Hiten
Date Deposited: 21 Jul 2017 10:56
Last Modified: 04 May 2020 20:00
URI: https://eprints.nottingham.ac.uk/id/eprint/44335

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