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SR-B1 drives endothelial cell LDL transcytosis via DOCK4 to promote atherosclerosis

机译:SR-B1通过Dock4驱动内皮细胞LDL转红菌病,以促进动脉粥样硬化

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摘要

Atherosclerosis, which underlies life-threatening cardiovascular disorders such as myocardial infarction and stroke(1), is initiated by passage of low-density lipoprotein (LDL) cholesterol into the artery wall and its engulfment by macrophages, which leads to foam cell formation and lesion development(2,3). It is unclear how circulating LDL enters the artery wall to instigate atherosclerosis. Here we show in mice that scavenger receptor class B type 1 (SR-B1) in endothelial cells mediates the delivery of LDL into arteries and its accumulation by artery wall macrophages, thereby promoting atherosclerosis. LDL particles are colocalized with SR-B1 in endothelial cell intracellular vesicles in vivo, and transcytosis of LDL across endothelial monolayers requires its direct binding to SR-B1 and an eight-amino-acid cytoplasmic domain of the receptor that recruits the guanine nucleotide exchange factor dedicator of cytokinesis 4 (DOCK4)(4). DOCK4 promotes internalization of SR-B1 and transport of LDL by coupling the binding of LDL to SR-B1 with activation of RAC1. The expression of SR-B1 and DOCK4 is increased in atherosclerosis-prone regions of the mouse aorta before lesion formation, and in human atherosclerotic arteries when compared with normal arteries. These findings challenge the long-held concept that atherogenesis involves passive movement of LDL across a compromised endothelial barrier. Interventions that inhibit the endothelial delivery of LDL into artery walls may represent a new therapeutic category in the battle against cardiovascular disease.
机译:通过将低密度脂蛋白(LDL)胆固醇进入动脉壁并通过巨噬细胞吞噬,引发威胁危及危及心肌梗死和中风(1)的植击性心血管障碍的血管粥样硬化,这导致泡沫细胞形成和病变导致泡沫细胞形成和病变发展(2,3)。目前尚不清楚循环LDL如何进入动脉壁以溶解动脉粥样硬化。在这里,在内皮细胞中的清除剂受体B类(SR-B1)的小鼠中显示出在内皮细胞中的1型(SR-B1)介导LDL的递送到动脉膜中的积累,从而促进动脉粥样硬化。 LDL颗粒与体内内皮细胞细胞内皮细胞内皮细胞内皮细胞的SR-B1颗粒分泌物,并且对内皮单层的LDL的转红菌症需要其直接结合对SR-B1和促进鸟嘌呤核苷酸交换因子的受体的八氨基酸细胞质结构域细胞因子4(Dock4)(4)的特点。 Dock4促进SR-B1的内化,通过偶联LDL与SR-B1的结合随着RAC1的激活来传输LDL。在与正常动脉相比,在病变形成之前,在病变形成之前,SR-B1和Dock4的表达增加了小鼠主动脉的动脉粥样硬化,并且在人动脉粥样硬化动脉中增加。这些发现挑战了αsthergesesis涉及LDL在受损内皮屏障中的被动运动的长期概念。抑制LDL内皮递送到动脉壁的干预措施可以代表抗心血管疾病的战斗中的新治疗类别。

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  • 来源
    《Nature》 |2019年第7757期|565-569|共5页
  • 作者单位

    Univ Texas Southwestern Med Ctr Dallas Dept Pediat Ctr Pulm & Vasc Biol Dallas TX USA;

    Univ Texas Southwestern Med Ctr Dallas Dept Pediat Ctr Pulm & Vasc Biol Dallas TX USA;

    Univ Texas Southwestern Med Ctr Dallas Childrens Res Inst Dallas TX 75390 USA|Univ Texas Southwestern Med Ctr Dallas Dept Pediat Dallas TX USA|Univ Texas Southwestern Med Ctr Dallas Dept Neurosci Dallas TX 75390 USA|Univ Texas Southwestern Med Ctr Dallas Dept Neurol & Neurotherapeut Dallas TX 75390 USA;

    Univ Texas Southwestern Med Ctr Dallas Dept Pediat Ctr Pulm & Vasc Biol Dallas TX USA;

    Univ Texas Southwestern Med Ctr Dallas Dept Pediat Ctr Pulm & Vasc Biol Dallas TX USA|Cornell Univ Coll Vet Med Dept Populat Med & Diagnost Sci Ithaca NY 14853 USA;

    NYU Sch Med Dept Med New York NY USA|NYU Sch Med Leon H Charney Div Cardiol New York NY USA|NYU Sch Med Marc & Ruti Bell Program Vasc Biol New York NY USA;

    Univ Texas Southwestern Med Ctr Dallas Dept Pediat Ctr Pulm & Vasc Biol Dallas TX USA;

    Univ Texas Southwestern Med Ctr Dallas Dept Cell Biol Dallas TX 75390 USA;

    Univ Texas Southwestern Med Ctr Dallas Dept Cell Biol Dallas TX 75390 USA;

    Univ Texas Southwestern Med Ctr Dallas Dept Cell Biol Dallas TX 75390 USA;

    Univ Texas Southwestern Med Ctr Dallas Quantitat Biomed Res Ctr Dallas TX 75390 USA|Univ Texas Southwestern Med Ctr Dallas Dept Clin Sci Dallas TX 75390 USA;

    NYU Sch Med Dept Med New York NY USA|NYU Sch Med Leon H Charney Div Cardiol New York NY USA|NYU Sch Med Marc & Ruti Bell Program Vasc Biol New York NY USA;

    Univ Texas Southwestern Med Ctr Dallas Childrens Res Inst Dallas TX 75390 USA|Univ Texas Southwestern Med Ctr Dallas Dept Pediat Dallas TX USA|Univ Texas Southwestern Med Ctr Dallas Dept Neurosci Dallas TX 75390 USA|Univ Texas Southwestern Med Ctr Dallas Dept Neurol & Neurotherapeut Dallas TX 75390 USA;

    Univ Texas Southwestern Med Ctr Dallas Dept Pediat Ctr Pulm & Vasc Biol Dallas TX USA|Univ Texas Southwestern Med Ctr Dallas Dept Cell Biol Dallas TX 75390 USA;

    Univ Texas Southwestern Med Ctr Dallas Dept Pediat Ctr Pulm & Vasc Biol Dallas TX USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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