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

Zurkinden, Line; Mansour, Yosef; Rohrbach, Beatrice; Vogt, Bruno; Mistry, Hiten D.; Escher, Genevieve

Authors

Line Zurkinden

Yosef Mansour

Beatrice Rohrbach

Bruno Vogt

Hiten D. Mistry hiten.mistry@nottingham.ac.uk

Genevieve Escher



Abstract

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.

Citation

Zurkinden, L., Mansour, Y., Rohrbach, B., Vogt, B., Mistry, H. D., & Escher, G. (2016). Hepatic caveolin-1 is enhanced in Cyp27A1/ApoE double knockout mice. FEBS Open Bio, 6(10), https://doi.org/10.1002/2211-5463.12123

Journal Article Type Article
Acceptance Date Aug 29, 2016
Online Publication Date Sep 26, 2016
Publication Date Oct 1, 2016
Deposit Date Jul 21, 2017
Publicly Available Date Jul 21, 2017
Journal FEBS Open Bio
Electronic ISSN 2211-5463
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 6
Issue 10
DOI https://doi.org/10.1002/2211-5463.12123
Public URL http://eprints.nottingham.ac.uk/id/eprint/44335
Publisher URL http://onlinelibrary.wiley.com/doi/10.1002/2211-5463.12123/full
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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