OxLDL induces endothelial dysfunction and death via TRAF3IP2: inhibition by HDL3 and AMPK activators.

OxLDL induces endothelial dysfunction and death via TRAF3IP2: inhibition by HDL3 and AMPK activators.
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OXLDL通过TRAF3IP2诱导内皮功能障碍和死亡:HDL3和AMPK激活剂的抑制作用。

DOI:
10.1016/j.freeradbiomed.2014.02.014
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发表时间:
2014-05
影响因子:
7.4
通讯作者:
Chandrasekar, Bysani
Chandrasekar, Bysani
中科院分区:
医学1区
文献类型:
--
作者:
Valente, Anthony J.;Irimpen, Anand M.;Siebenlist, Ulrich;Chandrasekar, Bysani

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氧化低密度脂蛋白 (OxLDL) 通过激活 NF-κB 和 AP-1 通路诱导内皮细胞死亡。 TRAF3IP2 是一种氧化还原敏感的细胞质接头蛋白,也是 IKK/NF-κB 和 JNK/AP-1 的上游调节因子。在这里,我们发现,通过敲低 TRAF3IP2 或凝集素样 OxLDL 受体 1 (LOX-1),OxLDL 诱导的人原代冠状动脉内皮细胞 (EC) 死亡显着减弱。此外,OxLDL 诱导 Nox2/超氧化物依赖性 TRAF3IP2 表达、IKK/p65 和 JNK/c-Jun 激活以及 LOX-1 上调,表明存在强化机制。同样,oxLDL(16:0-LPC 和 18:0-LPC)和最低修饰 LDL 中的溶血脂也上调 TRAF3IP2 表达。值得注意的是,虽然天然 HDL3 逆转了 OxLDL 诱导的 TRAF3IP2 表达和细胞死亡,但 15-脂氧合酶修饰的 HDL3 增强了其促凋亡作用。 AMPK/Akt 途径的激活剂、脂联素、AICAR 和二甲双胍减弱了超氧化物的产生、TRAF3IP2 的表达以及 OxLDL/TRAF3IP2 介导的 EC 死亡。此外,HDL3 和脂联素均可在体外逆转 OxLDL/TRAF3IP2 依赖性单核细胞与内皮细胞的粘附。重要的是,TRAF3IP2 基因缺失和 AMPK 激活剂逆转了 OxLDL 诱导的离体血管舒张受损。这些结果表明 OxLDL 诱导的内皮细胞死亡和功能障碍是通过 TRAF3IP2 介导的,并且天然 HDL3 和 AMPK 激活剂抑制这种反应。靶向 TRAF3IP2 可能会抑制动脉粥样硬化性血管疾病的进展。
Oxidized low-density lipoprotein (OxLDL) induces endothelial cell death through the activation of NF-κB and AP-1 pathways. TRAF3IP2 is a redox-sensitive cytoplasmic adapter protein and an upstream regulator of IKK/NF-κB and JNK/AP-1. Here we show that OxLDL-induced death in human primary coronary artery endothelial cells (EC) was markedly attenuated by the knockdown of TRAF3IP2 or the lectin-like OxLDL receptor 1 (LOX-1). Further, OxLDL induced Nox2/superoxide-dependent TRAF3IP2 expression, IKK/p65 and JNK/c-Jun activation and LOX-1 upregulation, suggesting a reinforcing mechanism. Similarly, the lysolipids present in oxLDL (16:0-LPC and 18:0-LPC) and minimally modified LDL also upregulated TRAF3IP2 expression. Notably, while native HDL3 reversed OxLDL-induced TRAF3IP2 expression and cell death, 15-lipoxygenase-modified HDL3 potentiated its pro-apoptotic effects. The activators of the AMPK/Akt pathway, adiponectin, AICAR and metformin attenuated superoxide generation, TRAF3IP2 expression, and OxLDL/TRAF3IP2-mediated EC death. Further, both HDL3 and adiponectin reversed OxLDL/TRAF3IP2-dependent monocyte adhesion to endothelial cells in vitro. Importantly, TRAF3IP2 gene deletion and the AMPK activators reversed OxLDL-induced impaired vasorelaxation ex-vivo. These results indicate that OxLDL-induced endothelial cell death and dysfunction are mediated via TRAF3IP2, and that native HDL3 and the AMPK activators inhibit this response. Targeting TRAF3IP2 could potentially inhibit progression of atherosclerotic vascular diseases.
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