Genetic evidence supporting a critical role of endothelial caveolin-1 during the progression of atherosclerosis.

Genetic evidence supporting a critical role of endothelial caveolin-1 during the progression of atherosclerosis.
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DOI:
10.1016/j.cmet.2009.06.003
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发表时间:
2009-07
期刊:
影响因子:
29
通讯作者:
Sessa WC
Sessa WC
中科院分区:
生物学1区
文献类型:
--
作者:
Fernández-Hernando C;Yu J;Suárez Y;Rahner C;Dávalos A;Lasunción MA;Sessa WC

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LDL衍生的胆固醇在动脉壁中的积累是导致动脉粥样硬化的起始事件。然而,导致动脉粥样硬化起始的机制仍然知之甚少。在这里,通过使用内皮细胞特异性转基因的小窝蛋白-1(Cav-1)在小鼠中,我们显示的关键作用,Cav-1在促进动脉粥样硬化。产生缺乏Cav-1和apoE但在双敲除背景中表达内皮特异性Cav-1的小鼠。在apoE基因敲除背景下对Cav-1进行基因消融可抑制动脉粥样硬化的进展,而Cav-1在内皮中的重新表达可促进病变扩展。从机制上讲,Cav-1的缺失减少了LDL向动脉壁的浸润,促进了一氧化氮的产生并减少了白细胞粘附分子的表达,在转基因小鼠中效果完全逆转。总之,这种独特的模型提供了支持内皮Cav-1表达在调节LDL进入血管壁和动脉粥样硬化起始中的重要作用的生理学证据。
The accumulation of LDL-derived cholesterol in the artery wall is the initiating event that causes atherosclerosis. However, the mechanisms that lead to the initiation of atherosclerosis are still poorly understood. Here, by using endothelial cell-specific transgenesis of the caveolin-1 (Cav-1) gene in mice, we show the critical role of Cav-1 in promoting atherogenesis. Mice were generated lacking Cav-1 and apoE but expressing endothelial-specific Cav-1 in the double knockout background. Genetic ablation of Cav-1 on an apoE knockout background inhibits the progression of atherosclerosis while re-expression of Cav-1 in the endothelium promotes lesion expansion. Mechanistically, the loss of Cav-1 reduces LDL infiltration into the artery wall, promotes nitric oxide production and reduces the expression of leukocyte adhesion molecules, effects completely reversed in transgenic mice. In summary, this unique model provides physiological evidence supporting the important role of endothelial Cav-1 expression in regulating the entry of LDL into the vessel wall and the initiation of atherosclerosis.
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