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Caveolin-1 regulates the anti-atherogenic properties of macrophages
Stephanos Pavlides1, Jorge L Gutierrez-Pajares, Sanjay Katiyar
1Manchester Breast Centre & Breakthrough Breast Cancer Research Unit, Paterson Institute for Cancer Research, School of Cancer, Enabling Sciences and Technology, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK.
Insights
Caveolin-1 (Cav-1) absence in macrophages worsens atherosclerosis by increasing inflammation and lesion size. However, its absence in endothelial cells offers protection, highlighting cell-specific roles in this complex vascular disease.
Area of Science:
- Cardiovascular Biology
- Cellular Metabolism
- Immunology
Background:
- Atherosclerosis involves lipoprotein accumulation and monocyte infiltration.
- Caveolin-1 (Cav-1) regulates cholesterol metabolism and signaling pathways.
- Understanding cell-specific roles of Cav-1 is crucial for atherosclerosis research.
Purpose of the Study:
- To investigate the specific role of macrophage Caveolin-1 (Cav-1) in atherosclerosis development.
- To determine the impact of Cav-1 absence in macrophages versus endothelial cells on atherosclerotic lesion formation.
Main Methods:
- Utilized bone marrow transplantation in Cav-1 (-/-) Apoe (-/-) mice.
- Transplanted bone marrow cells from Cav-1 (+/+) Apoe (-/-) and Cav-1 (-/-) Apoe (-/-) donors into recipient mice, and vice versa.
- Analyzed atherosclerotic lesion size, macrophage apoptosis, and inflammatory markers.
Main Results:
- Mice with Cav-1 (-/-) bone marrow-derived macrophages developed significantly larger atherosclerotic lesions.
- Absence of Cav-1 in macrophages increased susceptibility to apoptosis and inflammation.
- Absence of Cav-1 in endothelial cells was found to be protective against lesion formation.
Conclusions:
- Macrophage Caveolin-1 (Cav-1) absence is pro-atherogenic, promoting inflammation and lesion growth.
- Endothelial cell Cav-1 absence is protective against atherosclerosis.
- Cav-1 exhibits cell-specific functions in the pathogenesis of atherosclerosis.
Abstract:
Atherosclerosis is a complex disease initiated by the vascular accumulation of lipoproteins in the sub-endothelial space, followed by the infiltration of monocytes into the arterial intima. Caveolin-1 (Cav-1) plays an essential role in the regulation of cellular cholesterol metabolism and of various signaling pathways. In order to study specifically the role of macrophage Cav-1 in atherosclerosis, we used Cav-1 (-/-) Apoe (-/-) mice and transplanted them with bone marrow (BM) cells obtained from Cav-1 (+/+) Apoe (-/-) or Cav-1 (-/-) Apoe (-/-) mice and vice versa. We found that Cav-1 (+/+) mice harboring Cav-1 (-/-) BM-derived macrophages developed significantly larger lesions than Cav-1 (+/+) mice harboring Cav-1 (+/+) BM-derived macrophages. Cav-1 (-/-) macrophages were more susceptible to apoptosis and more prone to induce inflammation. The present study provides clear evidence that the absence of Cav-1 in macrophage is pro-atherogenic, whereas its absence in endothelial cells protects against atherosclerotic lesion formation. These findings demonstrate the cell-specific role of Cav-1 during the development of this disease.
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