通心络对血管紧张素Ⅱ诱导的血管内皮细胞活力及组织因子的影响

目的:研究通心络对血管紧张素Ⅱ(AngⅡ)诱导的人脐静脉内皮细胞(human umbilical vein endothelial cells,HUVECs)细胞活力(cell viability)及组织因子(tissue factor,TF)的影响和其作用机制.方法:分别用5%,10%,20%的通心络含药血浆预处理内皮细胞30 min后加入AngⅡ 10-6 mol/L孵育HUVECs 24 h,观察细胞活力变化的量效关系.选择一个最佳浓度的通心络含药血浆预处理内皮细胞30 min后加入AngⅡ 10-6 mol/L孵育HUVECs 24 h观察TF,AngⅡ1型受体(AT1)mRNA水平,一氧化氮合酶(NOS)活性及一氧化氮浓度(NO),并予NOS抑制剂(L-NAME)预处理内皮细胞30 min后,再加入通心络含药血浆和AngⅡ,观察孵育24 h细胞活力,TF,AT1,NOS及NO变化.结果:通心络能显著提高AngⅡ诱导的血管内皮细胞活力,以10%浓度作用最明显,通心络能降低TF及AT1水平及提高NOS活性和NO浓度;L-NAME可明显抑制通心络对血管内皮的作用.结论:通心络可能通过上调NOS-NO通路提高AngⅡ诱导的内皮细胞活力及抗血栓能力.

Effects of Tongxinluo on cell viability and tissue factor in Ang Ⅱ induced vascular endothelial cells

OBJECTIVE: To determine the effects of Tongxinluo on cell viability and tissue factor (TF) in AngII induced vascular endothelial cells and to investigate its mechanism. METHODS: AngII(10(-6)mol/L) was added to human vascular endothelial cells (HUVECs) culture media alone or with various concentration of Tongxinluo drug containing plasma (5%,10%, and 20%) added 30 minutes before AngII. Cell viability was evaluated after 24-hour incubation with AngII in a dose manner. TF, AngII type 1 receptor (AT(1)) mRNA, NO synthase (NOS) and NO were observed after 24-hour incubation with AngII. In addition, NOS inhibitor nomega-nitro-larginine (L-NAME) was added 30 minutes before Tongxinluo and AngII. Cell viability, TF, AT(1)mRNA, the level of NOS and NO were evaluated after 24-hour incubation with Tongxinluo and AngII. RESULTS: Tongxinluo significantly improved AngII induced endothelial cell viability and the effect was the most obvious at 10%. Tongxinluo (10%) decreased the TF and AT(1) mRNA while increased the NOS and NO levels. L-NAME obviously inhibited the effects of Tongxinluo on cell viability, TF, AT(1) mRNA, and NOS and NO levels. CONCLUSION: Up-regulating NOS-NO signaling may be the mechanism of Tongxinluo on cell viability and TF in AngII induced vacular endothelial cells.