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银杏叶提取物通过SIRT6调控NF-κB和CHOP信号通路改善氧糖剥夺/复氧诱导的心脏微血管内皮细胞损伤

Ginkgo biloba extract alleviates oxygen and glucose deprivation/reperfusion injury in cardiac microvascular endothelial cells by regulating NF-κB and CHOP signaling pathways through SIRT6

  • 摘要:
    目的 探讨银杏叶提取物(Ginkgo biloba extract,GBE)对氧糖剥夺/复氧(oxygen and glucose deprivation/reperfusion,OGD/R)条件下心脏微血管内皮细胞(cardiac microvascular endothelial cells,CMECs)的作用及其分子机制。
    方法 建立OGD/R诱导的CMECs损伤模型,根据不同处理分为4组:常氧空白对照组(WT组)、WT+GBE组、OGD/R组和OGD/R+GBE组。采用流式细胞术检测各组细胞凋亡水平,MitoSox染色检测细胞氧化应激水平,划痕实验检测细胞迁移能力,Western印迹法检测PERK/eIF2α/CHOP、核转录因子κB(nuclear factor kappa B,NF-κB)及内皮细胞功能相关蛋白标志物的表达水平。
    结果 与WT组相比,OGD/R组的内皮细胞凋亡水平显著上升,细胞功能损伤明显加重,p-NF-κB、血管细胞黏附分子1(vascular cell adhesion molecule-1,VCAM-1)、细胞间黏附分子1(intercellular cell adhesion molecule-1,ICAM-1)蛋白表达显著上调(P<0.05),CHOP信号通路激活明显增强(P<0.05);经GBE干预后,受损内皮细胞的凋亡明显减少,氧化应激和炎症水平明显下调,p-NF-κB蛋白表达显著减少(P<0.05),CHOP信号通路明显抑制(P<0.05)。进一步分析发现,GBE通过促进SIRT6表达来调控上述分子,进而减轻OGD/R条件下CMECs损伤;敲低SIRT6后,GBE减轻损伤的程度明显下降。
    结论 GBE通过促进SIRT6蛋白表达来调控NF-κB炎症分子及CHOP信号通路,改善OGD/R损伤造成的内皮细胞功能障碍、内质网应激和内皮细胞凋亡。

     

    Abstract:
    Objective To explore the effects of Ginkgo biloba extract (GBE) on cardiac microvascular endothelial cells (CMECs) under oxygen and glucose deprivation/reperfusion (OGD/R) condition and its molecular mechanisms.
    Methods An OGD/R-induced injury model was established in CMECs. According to different intervention, CMECs were divided into four groups: normoxia blank control group (WT group), WT + GBE group, OGD/R group, and OGD/R + GBE group. Cell apoptosis was detected by flow cytometry technology in each group. The oxidative stress was examined by MitoSox staining. The migration abilities were measured by scratch assay. The expressions of PERK/eIF2α/CHOP, nuclear factor kappa B (NF-κB), and endothelial cell function markers were detected by Western blotting.
    Results Compared with the WT group, the endothelial cell apoptosis level in the OGD/R group significantly increased, with markedly aggravated cellular dysfunction. The expressions of p-NF-κB, vascular cell adhesion molecule-1 (VCAM-1), and intercellular cell adhesion molecule-1 (ICAM-1) were significantly upregulated (P<0.05), and the activation of the CHOP signaling pathway was notably enhanced (P<0.05). After intervention with GBE, endothelial cell apoptosis caused by OGD/R injury was significantly reduced, oxidative stress and inflammation levels were markedly downregulated, and the expression of p-NF-κB was considerably decreased (P<0.05), while the CHOP signaling pathway was notably inhibited (P<0.05). Furthermore, it was found that GBE could promote expression of SIRT6 to regulate the above molecules, thereby alleviating cardiac microvascular endothelial cell injury under OGD/R condition. On the contrary, when SIRT6 was knocked down, the protective effects were significantly reduced.
    Conclusions GBE improves endothelial cell dysfunction, endoplasmic reticulum stress, and endothelial cell apoptosis caused by OGD/R injury by promoting the expression of SIRT6 protein, thus regulating the NF-κB inflammatory pathway and CHOP signaling pathway.

     

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