Oleanolic acid ameliorates high glucose-induced endothelial dysfunction via PPARδ activation.

Oleanolic acid ameliorates high glucose-induced endothelial dysfunction via PPARδ activation.
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齐墩果酸通过 PPARδ 激活改善高葡萄糖诱导的内皮功能障碍

DOI:
10.1038/srep40237
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发表时间:
2017-01-09
期刊:
影响因子:
4.6
通讯作者:
Wang N
Wang N
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhang Z;Jiang M;Xie X;Yang H;Wang X;Xiao L;Wang N

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齐墩果酸(3β-羟基齐墩果酸-12-en-28-oic Acid,OA)是一种五环三萜类化合物,广泛分布于食品、药用植物和营养补充剂中。 OA 具有多种药理特性,例如保肝和抗肿瘤作用。在本研究中,我们分析了 OA 对高糖诱导的人血管内皮细胞 (EC) 内皮功能障碍的影响。蛋白质印迹显示,OA 减弱了培养的人脐静脉 EC (HUVEC) 中高葡萄糖还原的一氧化氮 (NO) 以及 Akt-Ser473 和 eNOS-Ser1177 的磷酸化。接下来,荧光素酶报告基因检测显示 OA 激活了过氧化物酶体增殖物激活受体 δ (PPARδ) 活性。定量逆转录酶 PCR (qRT-PCR) 表明,OA 增加了 EC 中 PPARδ 靶基因(PDK4、ADRP 和 ANGPTL4)的表达。同时,OA诱导的PDK4、ADRP和ANGPTL4的表达被PPARδ特异性拮抗剂GSK0660抑制。此外,抑制 PPARδ 可以消除 OA 诱导的 Akt-Ser473 和 eNOS-Ser1177 磷酸化以及 NO 产生。最后,通过使用多肌动描记器系统,我们证明 OA 可以预防高血糖受损的血管舒张。在用 GSK0660 预处理的主动脉环中,这种对血管舒张的保护作用受到抑制。总的来说,我们证明 OA 通过 PPARδ 介导的机制和 eNOS/Akt/NO 途径改善高糖损伤的内皮功能。
Oleanolic acid (3β-hydroxyolean-12-en-28-oic acid, OA) is a pentacyclic triterpenes widely distributed in food, medicinal plants and nutritional supplements. OA exhibits various pharmacological properties, such as hepatoprotective and anti-tumor effects. In this study, we analyzed the effect of OA on endothelial dysfunction induced by high glucose in human vascular endothelial cells (ECs). Western blotting showed that OA attenuated high glucose-reduced nitric production oxide (NO) as well as Akt-Ser473and eNOS-Ser1177phosphorylation in cultured human umbilical vein ECs (HUVECs). Next, luciferase reporter assay showed that OA activated peroxisome proliferators-activated receptor δ (PPARδ) activity. Quantitative reverse transcriptase PCR (qRT-PCR) demonstrated that OA increased the expressions of PPARδ target genes (PDK4, ADRP and ANGPTL4) in ECs. Meanwhile, the induced expressions of PDK4, ADRP and ANGPTL4 by OA were inhibited by GSK0660, a specific antagonist of PPARδ. In addition, inhibition of PPARδ abolished OA-induced the Akt-Ser473and eNOS-Ser1177phosphorylation, and NO production. Finally, by using Multi Myograph System, we showed that OA prevented high glucose-impaired vasodilation. This protective effect on vasodilation was inhibited in aortic rings pretreated with GSK0660. Collectively, we demonstrated that OA improved high glucose-impaired endothelial function via a PPARδ-mediated mechanism and through eNOS/Akt/NO pathway.
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