Effect of ginkgolide B on junctional proteins in oxidized LDL-stimulated human umbilical vein endothelial cells / 中国药理学通报

ABSTRACT

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.