Humanin preserves endothelial function and prevents atherosclerotic plaque progression in hypercholesterolemic ApoE deficient mice.

Humanin preserves endothelial function and prevents atherosclerotic plaque progression in hypercholesterolemic ApoE deficient mice.
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DOI:
10.1016/j.atherosclerosis.2011.06.038
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发表时间:
2011-11
期刊:
影响因子:
5.3
通讯作者:
Lerman, Amir
Lerman, Amir
中科院分区:
医学2区
文献类型:
--
作者:
Oh, Yun K.;Bachar, Adi R.;Zacharias, David G.;Kim, Sung Gyun;Wan, Junxiang;Cobb, Laura J.;Lerman, Lilach O.;Cohen, Pinchas;Lerman, Amir

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护脑素(HN)是一种源自内源性线粒体的细胞保护肽,在人体血管内皮层中表达,但其在体内动脉粥样硬化形成中的作用尚不清楚。然而,在体外研究中,HN 减少了氧化低密度脂蛋白诱导的活性氧的形成和细胞凋亡。本研究验证了以下假设:长期使用 HN 治疗将对体内内皮功能障碍和动脉粥样硬化进展具有保护作用。每天腹膜内注射 HN 类似物 HNGF6A 16 周,可预防高胆固醇饮食的 ApoE 缺陷小鼠的内皮功能障碍,并减少近端主动脉的动脉粥样硬化斑块大小,但没有显示出直接的血管活性作用或降低胆固醇的作用。 HN 在主动脉斑块的内皮层中表达。 HNGF6A 治疗减少了主动脉斑块中的细胞凋亡和硝基酪氨酸免疫反应性,而不影响全身细胞因子谱。 HNGF6A 还保留了主动脉内皮一氧化氮合酶的表达。 HN 可能通过调节正在形成的斑块中的氧化应激和细胞凋亡,对内皮功能和动脉粥样硬化的进展产生保护作用。
Humanin (HN) is a cytoprotective peptide derived from endogenous mitochondria, expressed in the endothelial layer of human vessels, but its role in atherogenesis in vivo is not known. In vitro study, however, HN reduced oxidized low-density lipoprotein induced formation of reactive oxygen species and apoptosis. The present study tested the hypothesis that long term treatment with HN will have a protective role against endothelial dysfunction and progression of atherosclerosis in vivo. Daily intraperitonial injection of the HN analogue HNGF6A for 16 weeks prevented endothelial dysfunction and decreased atherosclerotic plaque size in the proximal aorta of ApoE-deficient mice fed on a high cholesterol diet, without showing direct vasoactive effects or cholesterol-reducing effects. HN was expressed in the endothelial layer on the aortic plaques. HNGF6A treatment reduced apoptosis and nitrotyrosine immunoreactivity in the aortic plaques without affecting the systemic cytokine profile. HNGF6A also preserved expression of endothelial nitric oxide synthase in aorta. HN may have a protective effect on endothelial function and progression of atherosclerosis by modulating oxidative stress and apoptosis in the developing plaque.
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