Genetic Dissection of the Impact of miR-33a and miR-33b during the Progression of Atherosclerosis.

Genetic Dissection of the Impact of miR-33a and miR-33b during the Progression of Atherosclerosis.
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DOI:
10.1016/j.celrep.2017.10.023
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发表时间:
2017-10-31
期刊:
影响因子:
8.8
通讯作者:
Fernández-Hernando C
Fernández-Hernando C
中科院分区:
生物学1区
文献类型:
--
作者:
Price NL;Rotllan N;Canfrán-Duque A;Zhang X;Pati P;Arias N;Moen J;Mayr M;Ford DA;Baldán Á;Suárez Y;Fernández-Hernando C

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作为巨噬细胞胆固醇流出和HDL生物合成的重要调节剂,miR-33是治疗动脉粥样硬化的有希望的靶标,并且许多研究表明miR-33的抑制增加HDL水平并降低斑块负荷。然而,关于miR-33如何影响动脉粥样硬化形成的重要问题仍然存在,包括这种保护是否主要是由于对斑块巨噬细胞的直接影响,或肝脏中脂质代谢的调节。我们证明,Ldlr−/−小鼠中的miR-33缺乏会促进肥胖、胰岛素抵抗和高脂血症,但不会影响斑块的发展。我们进一步评估了巨噬细胞和其他造血细胞中miR-33的缺失或miR-33 b的添加如何影响动脉粥样硬化的发生。miR-33的巨噬细胞特异性损失减少了高脂血症条件下的脂质积累和炎症,导致斑块负荷减少。因此,在miR-33缺陷小鼠中观察到的促动脉粥样硬化作用可能被巨噬细胞中的保护作用抵消,这可能是抗miR-33疗法减少动脉粥样硬化的主要机制。
As an important regulator of macrophage cholesterol efflux and HDL biogenesis, miR-33 is a promising target for treatment of atherosclerosis, and numerous studies demonstrate that inhibition of miR-33 increases HDL levels and reduces plaque burden. However, important questions remain about how miR-33 impacts atherogenesis, including whether this protection is primarily due to direct effects on plaque macrophages, or regulation of lipid metabolism in the liver. We demonstrate that miR-33 deficiency in Ldlr−/− mice promotes obesity, insulin-resistance and hyperlipidemia, but does not impact plaque development. We further assess how loss of miR-33 or addition of miR-33b in macrophages and other hematopoietic cells impact atherogenesis. Macrophage-specific loss of miR-33 decreases lipid accumulation and inflammation under hyperlipidemic conditions, leading to reduced plaque burden. Therefore, the pro-atherogenic effects observed in miR-33 deficient mice are likely counterbalanced by protective effects in macrophages, which may be the primary mechanism through which anti-miR-33 therapies reduce atherosclerosis.
巨噬细胞线粒体能量状态调节胆固醇外排,并在动脉粥样硬化中通过抗MIR33增强。
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