阿司匹林抑制ox-LDL诱导内皮细胞炎症分子表达的研究

目的评价阿司匹林对ox-LDL刺激内皮细胞炎症蛋白表达的影响。方法使用培养人脐带内皮细胞,用氧化型低密度脂蛋白刺激内皮细胞16h,终止反应后用SDS-PAGE分离蛋白,使用Western Blot分析蛋白表达的变化。ROS测定使用DCFH-DA荧光标记,用流式细胞仪测定荧光强度。结果①阿司匹林抑制ox-LDL诱导内皮细胞COX-2表达。使用ox-LDL刺激内皮细胞16h,COX-2表达增加,分别用2.5mmol·L-1和5mmol·L-1阿司匹林处理内皮细胞30min后,COX-2表达明显降低。②阿司匹林降低ox-LDL诱导的内皮细胞ICAM-1表达。ox-LDL刺激内皮细胞16h后,Western Blot结果显示ICAM-1内皮细胞表达明显增加。用免疫荧光染色的方法观察细胞获得了同样的结果,ox-LDL刺激后ICAM-1在内皮细胞膜上表达明显增加,阿司匹林处理后减少了ICAM-1在膜上的表达。③阿司匹林轻度抑制ox-LDL诱导内皮细胞ROS产生。0.3g·L-1ox-LDL刺激内皮细胞16h后细胞内ROS明显增高,但阿司匹林仅部分阻止ROS的产生。结论非甾体类抗炎药物阿司匹林对ox-LDL诱导COX-2、ICAM-1有明显的抑制作用,但不能完全阻止ox-LDL诱导的ROS产生。这些结果表明阿司匹林能够减轻氧化脂质诱导的内皮细胞炎症损伤反应。

Aspirin inhibition of expression of inflammatory proteins induced by oxidized low-density lipoprotein in HUVECs

Aim To evaluate the effects of aspirin on the expression of inflammatory proteins induced by oxidized low-density lipoprotein(ox-LDL) in human vascular endothelial cells (HUVECs). Methods HUVECs were stimulated with different concentrations of ox-LDL. The expression of inflammatory proteins was detected by Western blot.Intracellular ROS generation was measured by flow cytometry using perexide-sensitive flurscent probe 2′, 7′-dichrofluorescein diacetate(DCFH-DA).Results ① Aspirin inhibited COX-2 expression induced by ox-LDL. Cells were preincubated with 2.5 mmol·L-1, 5 mmol·L-1 of aspirin or without any treatment for 30 min and then stimulated by 0.3 g·L-1 ox-LDL for 16 h, COX-2 expression was reduced by treating of aspirin.COX-2 expression was enhanced after the stimulation with ox-LDL, and aspirin inhibited the increasing.② Aspirin suppressed ICAM-1 expression induced by ox-LDL in HUVECs. ICAM-1 expression was increased by ox-LDL stimulation for 16 h, and aspirin significantly down-regulated the expression. Similar results were obtained by immunofluorescence.③ Aspirin partially reduced ROS production induced by ox-LDL in HUVECs. After stimulation with 0.3 g·L-1 ox-LDL for 16 h, the intracellular level of ROS was increased, however, aspirin failed to fully inhibit the phenomenon.Conclusion Nonsteroidal anti-inflammatory drugs (NSAID) aspirin significantly down-regulated the expression of COX-2 and ICAM-1 induced by ox-LDL.The results suggested that aspirin could reduce the inflammation responses mediated by ox-LDL on HUVECs in atherosclerosis.