SIRT1 decreases Lox-1-mediated foam cell formation in atherogenesis.

SIRT1 decreases Lox-1-mediated foam cell formation in atherogenesis.
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DOI:
10.1093/eurheartj/ehq107
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发表时间:
2010-09
影响因子:
39.3
通讯作者:
Matter CM
Matter CM
中科院分区:
医学1区
文献类型:
--
作者:
Stein S;Lohmann C;Schäfer N;Hofmann J;Rohrer L;Besler C;Rothgiesser KM;Becher B;Hottiger MO;Borén J;McBurney MW;Landmesser U;Lüscher TF;Matter CM

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内皮细胞活化、巨噬细胞浸润和泡沫细胞形成是动脉粥样硬化形成的关键步骤。我们在这项研究中的目的是分析SIRT 1,一种具有重要代谢功能的III类脱乙酰酶,在斑块巨噬细胞和动脉粥样硬化形成中的作用。在动脉粥样硬化小鼠中使用部分SIRT 1缺失,我们证明SIRT 1通过减少巨噬细胞泡沫细胞形成来保护动脉粥样硬化。来自杂合SIRT 1小鼠的腹膜巨噬细胞积累更多的氧化低密度脂蛋白(oxLDL),从而促进泡沫细胞形成。骨髓限制性SIRT 1缺失证实巨噬细胞中的SIRT 1功能足以减少动脉粥样硬化形成。此外,我们发现SIRT 1通过抑制NF-κB信号通路减少凝集素样oxLDL受体-1(Lox-1)的表达,从而减少oxLDL的摄取。我们的研究结果表明SIRT 1在动脉粥样硬化形成中的保护作用,并建议药理学SIRT 1激活作为一种新的抗动脉粥样硬化的策略,通过减少巨噬细胞泡沫细胞的形成。
Endothelial activation, macrophage infiltration, and foam cell formation are pivotal steps in atherogenesis. Our aim in this study was to analyse the role of SIRT1, a class III deacetylase with important metabolic functions, in plaque macrophages and atherogenesis. Using partial SIRT1 deletion in atherosclerotic mice, we demonstrate that SIRT1 protects against atherosclerosis by reducing macrophage foam cell formation. Peritoneal macrophages from heterozygous SIRT1 mice accumulate more oxidized low-density lipoprotein (oxLDL), thereby promoting foam cell formation. Bone marrow-restricted SIRT1 deletion confirmed that SIRT1 function in macrophages is sufficient to decrease atherogenesis. Moreover, we show that SIRT1 reduces the uptake of oxLDL by diminishing the expression of lectin-like oxLDL receptor-1 (Lox-1) via suppression of the NF-κB signalling pathway. Our findings demonstrate protective effects of SIRT1 in atherogenesis and suggest pharmacological SIRT1 activation as a novel anti-atherosclerotic strategy by reducing macrophage foam cell formation.
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