Genetic Ablation of Caveolin-1 Confers Protection Against Atherosclerosis

Philippe G. Frank, Hyangkyu Lee, David S. Park, Narendra N. Tandon, Phillip E. Scherer, Michael P. Lisanti

Research output: Contribution to journalArticle

157 Scopus citations

Abstract

Objective-The development of atherosclerosis is a process characterized by the accumulation of lipids in the form of modified lipoproteins in the subendothelial space. This initiating step is followed by the subsequent recruitment and proliferation of other cell types, including monocytes/macrophages and smooth muscle cells. Here, we evaluate the potential role of caveolae membrane domains in the pathogenesis of atherosclerosis by using apolipoprotein E-deficient (ApoE-/-) mice as a model system. Methods and Results-Caveolin-1 (Cav-1) is a principal structural protein component of caveolae membrane domains. To directly assess the in vivo role of caveolae and Cav-1 in atherosclerosis, we interbred Cav-1-/- mice with ApoE-/-mice. Interestingly, loss of Cav-1 resulted in a dramatic >2-fold increase in non-HDL plasma cholesterol levels in the ApoE-/- background. However, despite this hypercholesterolemia, we found that loss of Cav-1 gene expression was clearly protective against the development of aortic atheromas, with up to an ≈70% reduction in atherosclerotic lesion area. Mechanistically, we demonstrated that loss of Cav-1 resulted in the dramatic downregulation of certain proatherogenic molecules, namely, CD36 and vascular cell adhesion molecule-1. Conclusions-Taken together, our results indicate that loss of Cav-1 can counteract the detrimental effects of atherogenic lipoproteins. Thus, Cav-1 is a novel target for drug development in the pharmacologic prevention of atheroma formation. Our current data also provide the first molecular genetic evidence to support the hypothesis that caveolar transcytosis of modified lipoproteins (from the blood to the sub-endothelial space) is a critical initiating step in atherosclerosis.

Original languageEnglish (US)
Pages (from-to)98-105
Number of pages8
JournalArteriosclerosis, thrombosis, and vascular biology
Volume24
Issue number1
DOIs
StatePublished - Jan 1 2004

Keywords

  • Caveolin
  • Cholesterol
  • HDL
  • Lipoproteins

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

Fingerprint Dive into the research topics of 'Genetic Ablation of Caveolin-1 Confers Protection Against Atherosclerosis'. Together they form a unique fingerprint.

  • Cite this