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首页> 中文期刊> 《中国药理学通报》 >银杏内酯B对内皮细胞连接蛋白的影响及其分子机制研究

银杏内酯B对内皮细胞连接蛋白的影响及其分子机制研究

         
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Aim To investigate the effect of ginkgolide B on junctional proteins in ox-LDL-stimulated human umbilical vein endothelial cells ( HUVECs) . Methods After incubation with ginkgolide B ( 0 . 2 ,0 . 4 ,0 . 6 g · L-1 ) for 1 h, HUVECs were treated with ox-LDL (0. 1 g·L-1 ) for 4 h. The expressions of JAM-A and Cx43 were analyzed with Western blot and immunofluo-rescence. The effect of ginkgolide B on vascular per-meability was analyzed by Transwell experiments. Re-sults JAM-A and Cx43 expressions increased by 22%and 24% in ox-LDL-treated HUVECs, respectively. Whereas ginkgolide B significantly decreased JAM-A and Cx43 expressions. LY294002, a specific inhibitor of PI3K, suppressed JAM-A and Cx43 expressions in ox-LDL-stimulated cells. Ginkgolide B potently re-duced monocyte migration in ox-LDL-treated cells. Conclusion Ginkgolide B significantly suppresses JAM-A and Cx43 expressions, and reduces monocyte migration in ox-LDL-stimulated cells. This demon-strates that ginkgolide B can improve vascular permea-bility. The mechanism might be associated with the in-hibition of PI3K/Akt signaling pathway.%目的：探讨银杏内酯B对人脐静脉内皮细胞连接蛋白以及血管渗透性的影响。方法用银杏内酯 B (0．2、0．4、0．6 g·L-1)孵育人脐静脉内皮细胞1 h,再用ox-LDL刺激细胞4 h,用Western blot及免疫荧光法检测JAM-A、Cx43的表达。用白细胞迁移实验观察ox-LDL损伤内皮细胞以及银杏内酯B对单核细胞向内皮细胞下迁移的影响。结果①ox-LDL刺激内皮细胞4 h,JAM-A表达增加了22%,Cx43表达增加了24%,银杏内酯B处理的细胞JAM-A、Cx43表达明显降低。免疫荧光检测获得了同样的结果。② PI3K特异性抑制剂 LY294002同样抑制了 ox-LDL刺激的 JAM-A、Cx43表达,表明银杏内酯B降低JAM-A、Cx43表达与抑制Akt磷酸化相关。③白细胞迁移实验表明,银杏内酯B明显减少ox-LDL诱导的单核细胞向内皮细胞下迁移。结论银杏内酯B能抑制ox-LDL刺激的内皮细胞连接蛋白JAM-A、Cx43表达,从而改善血管渗透性,减少白细胞迁移,分子机制可能与抑制PI3K/Akt信号通路活化有关。

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