摘要
目的研究血管紧张素(1-7)对血管紧张素Ⅱ诱导的脐静脉内皮细胞E-选择素和单核细胞趋化蛋白1表达的影响,并初步探讨血管紧张素(1-7)的作用机制,阐明血管紧张素(1-7)对血管紧张素Ⅱ在炎症方面的拮抗作用。方法经形态学及抗VⅢ因子抗体免疫荧光染色鉴定的人脐静脉内皮细胞,按以下分组加入不同干扰因素进行实验。实验分组:①对照组:不加干预因素;②血管紧张素Ⅱ组:加入血管紧张素Ⅱ100 nmol/L;③血管紧张素(1-7)组:加入血管紧张素(1-7)1000 nmol/L;④血管紧张素Ⅱ+血管紧张素(1-7)组:分别用血管紧张素(1-7)10、100、1000、10000 nmol/L预处理30 min后,再加入血管紧张素Ⅱ100 nmol/L;⑤血管紧张素Ⅱ+血管紧张素(1-7)+血管紧张素(1-7)受体拮抗剂A-779组:先用1000 nmol/L A-779预处理30 min后,再用终浓度为1000 nmol/L血管紧张素(1-7)预处理30 min,最后加入终浓度100 nmol/L血管紧张素Ⅱ。各组用酶联免疫吸附法和逆转录聚合酶链反应从蛋白和mRNA水平检测E-选择素和单核细胞趋化蛋白1的表达情况。结果正常细胞生长良好,呈鹅卵石样镶嵌排列,细胞透明度大,轮廓不清。荧光免疫组化染色法,可检测到培养的人脐静脉内皮细胞的VⅢ因子相关抗原为阳性。①与对照组比,血管紧张素Ⅱ(100 nmol/L)使E-选择素(25.39±1.97μg/L)和单核细胞趋化蛋白1(238.71±5.51 ng/L)的蛋白分泌量明显增加,E-选择素和单核细胞趋化蛋白1 mRNA的表达显著升高(均P〈0.01);②血管紧张素(1-7)(1 000 nmol/L)使E-选择素(3.72±0.95μg/L)和单核细胞趋化蛋白1(90.24±9.82 ng/L)的蛋白分泌量降低,E-选择素和单核细胞趋化蛋白1 mRNA表达亦降低(均P〈0.01);③混合刺激组中血管紧张素(1-7)(1010000 nmol/L)减少E-选择素蛋白合成,分别为21.15±1.31、17.41±1.94、12.71±1.84、9.46±1.40μg/L,均低于血管紧张素Ⅱ组(均P〈0.01);同时也减少单核细胞趋化蛋白1蛋白合成,分别为214.57±7.16、196.83±8.20、176.63±8.93、155.52±8.19 ng/L,均低于血管紧张素Ⅱ组(均P〈0.01);④混合刺激组中,与AngⅡ组比较,血管紧张素(1-7)(1010000 nmol/L)呈剂量依赖性的抑制AngⅡ刺激E-选择素、单核细胞趋化蛋白1 mRNA的表达(均P〈0.01);⑤加入血管紧张素(1-7)受体拮抗剂A-779后,血管紧张素(1-7)的作用消失。结论血管紧张素(1-7)通过其特异性受体Mas拮抗血管紧张素Ⅱ诱导的人脐静脉内皮细胞E-选择素和单核细胞趋化蛋白1的表达,并呈浓度依赖性。
Aim To explore the influence of angiotensin-(1-7) [Ang-(1-7)] on the secretion of E-selectin(E-sel) and monocyte chemotactic protein-1(MCP-1) in cultured human umbilical vein cells induced by angiotensin Ⅱ(AngⅡ),and to clarify the antagonism of Ang-(1-7) on the inflammation induced by AngⅡ. Methods The cultured human umbilical vein endothelial cells(HUVECs) were randomly divided into control group,AngⅡ group,Ang-(1-7) group,Ang-(1-7)+AngⅡ group,and A-779+Ang-(1-7)+AngⅡ group.The expressions of E-sel and MCP-1 inprotein level and mRNA level were detected by enzyme linked immunosorbent assay(ELISA) and reverse transcription polymerase chain reaction(RT-PCR). Results ①Compared with the control group,100 nmol/L AngⅡ distinctly increased the protein of E-sel(25.39±1.97 μg/L) and MCP-1(238.71±5.51 ng/L) in HUVECs(P〈0.01),and significantly increased mRNA expression of E-sel and MCP-1 in HUVECs(P〈0.01).②Compared with the AngⅡ group,Ang-(1-7)(1 000 nmol/L) decreased the protein of E-sel(3.72±0.95 μg/L) and MCP-1(90.24±9.82 ng/L)(P〈0.01),and the mRNA expression of E-sel and MCP-1(P〈0.01).③10~10 000 nmol/L Ang-(1-7) attenuated the protein of E-sel in HUVECs induced by AngⅡ in a concentration dependent manner(21.15±1.31 μg/L,17.41±1.94 μg/L,12.71±1.84 μg/L and 9.46±1.40 μg/L)(P〈0.01),and also inhibited the protein of MCP-1 in HUVECs induced by AngⅡ in a concentration dependent manner(214.57±7.16 ng/L,196.83±8.20 ng/L,176.63±8.93 ng/L and 155.52±8.19 ng/L)(P〈0.01).④Compared with the AngⅡ group,10~10 000 nmol/L Ang-(1-7) inhibited the mRNA expression of E-sel and MCP-1 in HUVECs induced by AngⅡ in a dose dependent manner(P〈0.01).⑤The A-779 group had no significant deviation than the AngⅡ group(P〉0.05). Conclusions Ang-(1-7) inhibited the secretion of E-sel and MCP-1 in cultured HUVECs induced by AngⅡ in a concentration dependent matter.The inhibition effect of Ang-(1-7) may be through its specific receptor.
出处
《中国动脉硬化杂志》
CAS
CSCD
北大核心
2009年第8期651-656,共6页
Chinese Journal of Arteriosclerosis