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首页> 外文期刊>Biochimica et biophysica acta. Molecular basis of disease: BBA >Dihomo-gamma-linolenic acid inhibits several key cellular processes associated with atherosclerosis
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Dihomo-gamma-linolenic acid inhibits several key cellular processes associated with atherosclerosis

机译:Dihomo-Gamma-亚麻酸抑制与动脉粥样硬化相关的几种关键细胞过程

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Atherosclerosis and its complications are responsible for one in three global deaths. Nutraceuticals show promise in the prevention and treatment of atherosclerosis but require an indepth understanding of the mechanisms underlying their actions. A previous study showed that the omega-6 fatty acid, dihomo-gamma-linolenic acid (DGLA), attenuated atherosclerosis in the apolipoprotein E deficient mouse model system. However, the mechanisms underlying such protective effects of DGLA are poorly understood and were therefore investigated. We show that DGLA attenuates chemokine-driven monocytic migration together with foam cell formation and the expression of key pro-atherogenic genes induced by three pro-inflammatory cytokines in human macrophages. The effect of DGLA on interferon-gamma signaling was mediated via inhibition of signal transducer and activator of transcription-1 phosphorylation on serine 727. In relation to anti-foam cell action, DGLA inhibits modified LDL uptake by both macropinocytosis and receptor-mediated endocytosis, the latter by reduction in expression of two key scavenger receptors (SR-A and CD36), and stimulates cholesterol efflux from foam cells. DGLA also improves macrophage mitochondrial bioenergetic profile by decreasing proton leak. Gamma-linolenic acid and prostaglandin El, upstream precursor and key metabolite respectively of DGLA, also acted in an anti-atherogenic manner. The actions of DGLA extended to other key atherosclerosis-associated cell types with attenuation of endothelial cell proliferation and migration of smooth muscle cells in response to platelet-derived growth factor. This study provides novel insights into the molecular mechanisms underlying the anti-atherogenic actions of DGLA and supports further assessments on its protective effects on plaque regression in vivo and in human trials.
机译:动脉粥样硬化及其并发症是三个全球死亡人员的责任。 Nutraceuticals展示了在动脉粥样硬化的预防和治疗中的承诺,但需要深入了解其行为的机制。先前的研究表明,欧米茄-6脂肪酸,Dihomo-γ-亚麻酸(DgLa),脂蛋白E缺乏小鼠模型系统中减毒的动脉粥样硬化。然而,DGLA的这种保护作用的基础理解得很差,因此研究了。我们表明DGLA将趋化因子驱动的单核细胞迁移在一起,与泡沫细胞形成以及由人巨噬细胞中的三种促炎细胞因子诱导的关键促致细胞生成基因的表达。通过抑制丝氨酸727的信号传感器和转录-1磷酸化活化剂的抑制介导的Dgla对干扰素-γ信号传导的影响。关于抗泡沫细胞作用,DGLA抑制了通过癌细胞增生和受体介导的内吞作用的改性的LDL吸收,后者通过减少两种关键清除剂(SR-A和CD36)的表达,并刺激泡沫细胞的胆固醇渗透。通过减少质子泄漏,DGLA还通过降低质子泄漏来改善巨噬细胞线粒体生物能谱。 γ-亚麻酸和前列腺素EL,分别是DGLA的上游前体和键代谢物,也以抗动脉粥样硬化方式作用。 DGLA的作用延伸到其他关键的动脉粥样硬化相关细胞类型,响应于血小板衍生的生长因子而衰减内皮细胞增殖和平滑肌细胞的迁移。本研究提供了对DGLA抗动致动作的分子机制的新颖见解,并支持进一步评估其对体内斑块回归和人类试验的保护作用。

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