Tannic acid as a plant-derived polyphenol exerts vasoprotection via enhancing KLF2 expression in endothelial cells.

Tannic acid as a plant-derived polyphenol exerts vasoprotection via enhancing KLF2 expression in endothelial cells.
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DOI:
10.1038/s41598-017-06803-x
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发表时间:
2017-07-27
期刊:
影响因子:
4.6
通讯作者:
Jin ZG
Jin ZG
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Xu Y;Liu P;Xu S;Koroleva M;Zhang S;Si S;Jin ZG

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转录因子 Kruppel 样因子 2 (KLF2) 是血管内皮细胞中重要的抗炎和抗动脉粥样硬化分子。增强 KLF2 表达和活性可改善内皮功能并预防动脉粥样硬化。然而,KLF2 的药理学和分子调节剂很少。使用高通量荧光素酶报告基因测定来筛选 KLF2 激活剂,我们发现单宁酸 (TA)(一种多酚化合物)是一种有效的 KLF2 激活剂,可减轻内皮炎症。机制研究表明,TA 部分通过 ERK5/MEF2 途径诱导 KLF2 表达。从功能上讲,TA 通过降低粘附分子 VCAM1 的表达,显着降低单核细胞对 EC 的粘附。使用从 Klf2 +/+ 和 Klf2 +/- 小鼠中分离的肺 EC,我们发现 TA 的抗炎作用依赖于 KLF2。总的来说,我们的结果表明 TA 是一种有效的 KLF2 激活剂,并且 TA 通过上调 KLF2 减轻内皮炎症。我们的研究结果为 TA 既定的有益心血管作用提供了一种新机制,并表明 KLF2 可能成为动脉粥样硬化性血管疾病的新治疗靶点。
The transcription factor Kruppel-like factor 2 (KLF2) is a critical anti-inflammatory and anti-atherogenic molecule in vascular endothelium. Enhancing KLF2 expression and activity improves endothelial function and prevents atherosclerosis. However, the pharmacological and molecular regulators for KLF2 are scarce. Using high-throughput luciferase reporter assay to screen for KLF2 activators, we have identified tannic acid (TA), a polyphenolic compound, as a potent KLF2 activator that attenuates endothelial inflammation. Mechanistic studies suggested that TA induced KLF2 expression in part through the ERK5/MEF2 pathway. Functionally, TA markedly decreased monocyte adhesion to ECs by reducing expression of adhesion molecule VCAM1. Using lung ECs isolated from Klf2 +/+ and Klf2 +/− mice, we showed that the anti-inflammatory effect of TA is dependent on KLF2. Collectively, our results demonstrate that TA is a potent KLF2 activator and TA attenuated endothelial inflammation through upregulation of KLF2. Our findings provide a novel mechanism for the well-established beneficial cardiovascular effects of TA and suggest that KLF2 could be a novel therapeutic target for atherosclerotic vascular disease.
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