活化蛋白C抑制血管内皮细胞凋亡的机制研究

目的 观察活化蛋白C(activated protein C,APC)对线粒体凋亡途径相关调节因子的影响,以阐述其抑制血管内皮细胞凋亡作用的可能机制.方法 人脐静脉血管内皮细胞与脂多糖(1μg/mL)孵育诱导细胞凋亡模型后,分别给予APC(10 ng/mL或50 ng/mL)建立药物治疗组,另设立对照和凋亡模型组,24 h后取材,RT-PCR和Western blotting检测Bcl-2,Bax,P53和Caspase 3 mRNA及蛋白表达.结果 不同剂量APC治疗组与凋亡模型组比较P53,Bax和Caspase 3 mRNA和蛋白表达下调,Bcl-2 mRNA和蛋白表达上调,尤以APC 50 ng/mL治疗组为显著(P<0.05).结论 APC可能参与调节Caspase 3依赖性的线粒体凋亡途径相关因子的表达,发挥抑制LPS诱导的血管内皮细胞凋亡,从而为APC制剂在感染性疾病中的使用提供了理论基础.

Study of the role of activated protein C in the apoptosis of endothelial cell

Objective To study the protective effects of activated protein C (AFC) on the apoptosis of endothelial cells induced by lipopolysaccharide (LPS) in order to clarify the mechanisms associated with the expression of some genes related to apoptosis. Method The human umbilical vein endothelial cells were incubated with LPS (1.0 μg/mL) for one hour to make the models of cell apoptosis, and then the different concentrations of AFC (10 ng/mL and 50 ng/mL) were added to the models of cell apoptosis as treatment group. Therefore, there were two groups, model group and APC treated group. The factors related with apoptosis such as P53, Bax, Bcl-2, and caspase-3 mRNA or protein level were measured by using RT-PCR and Western blotting. Results Compared with LPS stimulated cells, the expressions of P53, Bax and caspase-3 mRNA and levels of protein were decreased and the expression of Bcl-2 mRNA and protein level were increased in APC treated cells particularly in APC 50 ng/mL treated cells (P <0.05). Conclusions The APC inhibits the apoptosis of HUVECs induced by LPS via regulating the mitochondrial-dependent apoptosis pathway, and it may become a novel therapeutic agent for infection disease.