四环素抑制活化的内皮细胞表达粘附分子

目的　研究四环素对肿瘤坏死因子 α(TNF α)或细菌内毒素 (LPS)活化的内皮细胞表达粘附分子E 选择素和细胞间粘附分子 1(ICAM 1)的影响 ,为探讨四环素类药物的抗炎作用提供新的实验依据。方法　用TNF α(0 5～ 5 0 μg·L-1)或LPS(0 5～ 5 0mg·L-1)孵育培养的人脐静脉内皮细胞使其活化 ;用四环素 (10 -6～ 10 -4 mol·L-1)预孵育内皮细胞 1h再与TNF α(1μg·L-1)或LPS(5mg·L-1)共同孵育4h或 18h ;应用细胞 酶联免疫吸附分析方法检测E 选择素和ICAM 1的表达。结果　TNF α或LPS孵育内皮细胞 4h明显诱导E 选择素的表达 ,TNF α或LPS孵育内皮细胞 18h明显增加ICAM 1的构成表达 (P <0 0 1) ;用四环素处理后则明显抑制TNF α或LPS诱导的E 选择素和ICAM 1的表达 (P <0 0 1) ,并呈现剂量依赖性。结论　四环素可抑制TNF α或LPS活化的人脐静脉内皮细胞表达粘附分子E 选择素和细胞间粘附分子 1。     

丹参素对CD11b、P-selectin、ICAM-1、VCAM-1、E-selectin表达的影响

目的　考察丹参素对血小板、白细胞和血管内皮细胞表达细胞粘附分子CD11b、P selectin、ICAM 1、VCAM 1、E selectin的影响 ,以期探明其抗血栓形成作用的机制。方法　用流式细胞仪测定由TNFα、fMLP和凝血酶诱导细胞表面细胞粘附分子的表达。结果　人粒细胞受到fMLP刺激后 ,细胞表面CD11b表达明显增加。丹参素与粒细胞预孵30min后 ,则剂量依赖性地抑制CD11b的表达。血小板与凝血酶 (1× 10 3U·L-1)共孵 2 0min ,可明显增加血小板表面P selectin的表达。丹参素 (10 0～ 30 0mg·L-1)与血小板预孵 30min ,对凝血酶诱导的血小板表面P selectin的表达未见明显抑制作用。人脐静脉内皮细胞 (HUVEC)经TNFα处理后 ,明显增加细胞表面ICAM 1、VCAM 1和E selectin的表达 ,不同浓度的丹参素与HUVEC预孵 2h ,对TNFα诱导HUVEC表面ICAM 1的表达未见明显抑制作用 ,对TNFα诱导的VCAM 1、E selectin表达则可产生明显的抑制作用。结论　丹参素可抑制血管内皮细胞和粒细胞表达细胞粘附分子。这可能是丹参素发挥抗血栓形成作用的机制之一。     

阿魏酸对活化内皮细胞E-选择素表达及内皮与白细胞粘附的影响

目的研究阿魏酸对脂多糖活化的人脐静脉内皮细胞E-选择素表达及内皮与白细胞粘附的影响.方法用逆转录-多聚酶链反应及流式细胞术检测阿魏酸对E-选择素转录及翻译的影响,用虎红染色法检测阿魏酸对HL60细胞与内皮细胞粘附的影响.结果阿魏酸(0.41及0.62 mmol·L-1)能下调E-选择素及E-选择素mRNA表达水平,对HL60细胞与内皮细胞粘附也有抑制作用.结论阿魏酸能够抑制活化内皮细胞E-选择素和E-选择素mRNA表达及HL60与内皮细胞粘附.阿魏酸对缺血再灌注损伤的保护作用可能与此有关.     

血脂康对血管紧张素Ⅱ诱导内皮细胞E-选择素表达的影响

目的观察血管紧张素Ⅱ（AngⅡ）对人脐静脉内皮细胞（简称内皮细胞）E-选择素表达的影响以及血脂康对AngⅡ此诱导作用的干预。方法用ELISA法检测AngⅡ对内皮细胞E-选择素表达的影响，用RT—PCR检测AngⅡ对内皮细胞E-选择素mRNA表达的影响，用细胞计数法观察经AngⅡ作用的内皮细胞与单核细胞的粘附率，同时检测血脂康的干预效应。结果四种不同浓度的AngⅡ（10^-8、10^-8、10^-7、10^-6mol／L）能诱导内皮细胞E-选择素及其mRNA的表达，增加内皮细胞与单核细胞的粘附率，且作用呈剂量依赖关系；而血脂康（500ng／ml）能抑制AngⅡ诱导的内皮细胞E-选择素及其mRNA的表达，降低内皮细胞与单核细胞的粘附率。结论血脂康能发挥抗动脉粥样硬化作用，抑制动脉粥样硬化的进程。     

人脐带内皮细胞受到血流剪切应力刺激后表达凋亡蛋白X连锁抑制物(英文)

目的　生理水平的血流剪切应力有抑制内皮细胞凋亡等作用 ,进而发挥抗动脉粥样硬化作用 ,本研究的目的是阐明血流剪切应力抑制血管内皮细胞凋亡的分子机制。方法　人脐静脉内皮细胞培养于DMEM培养液 ,当细胞融合时将细胞暴露于 2 0dyne·cm-2 的剪切应力 ,分别用免疫印迹杂交及实时聚合酶链反应法检测凋亡蛋白X连锁抑制物 (X linkedinhibitorofapoptosisprotein ,XIAP)mRNA及蛋白的表达。结果　 2 0dyne·cm-2 的剪切应力刺激 1～ 4h ,可诱导内皮细胞产生XIAPmRNA ,4h时表达最多。 2 0dyne·cm-2 剪切应力刺激 6,1 2和 2 4h ,XI AP蛋白表达明显增加。结论　生理水平的剪切应力明显诱导内皮细胞XIAPmRNA和蛋白的表达 ,这可能是剪切应力抑制内皮细胞凋亡 ,发挥抗动脉粥样硬化作用的机制之一     

西洛他唑对磷脂多糖诱导的粘附及粘附分子释放的影响

目的　研究磷酸二酯酶 3型抑制剂西洛他唑对磷脂多糖 (LPS)诱导的粘附及血管内皮细胞 (ECs)释放可溶性细胞粘附分子 (sCAMs)的影响。方法　体外培养第 4～ 6代人脐静脉血管内皮细胞 (HUVECs) ,以LPS(5mg·L- 1)刺激 ,并与西洛他唑 (1～ 10 μmol·L- 1)共培养 2 4h ,观察西洛他唑对由LPS诱导的HUVECs与中性粒细胞之间的粘附的影响 ;另取培养上清 ,以ELISA法测定HUVECs释放可溶性血管细胞粘附分子 1(sVCAM 1)、细胞间粘附分子 1(sICAM 1)以及E 选择素 (sE selectin ,sELAM 1)。结果　西洛他唑抑制由LPS诱导的HUVECs与中性粒细胞之间的粘附以及HUVECs释放sVCAM 1,而对sICAM 1和sE 选择素无影响。并且 ,该药对于sVCAM 1的抑制作用被蛋白激酶A(PKA)抑制剂H 89所阻断。结论　西洛他唑对由细胞因子LPS诱导的粘附反应以及ECs释放sVCAM 1有抑制作用 ,后者可能与PKA依赖性通路相关     

丙丁酚抑制体外氧化低密度脂蛋白诱导的单核细胞对内皮细胞的粘附

目的:研究丙丁酚抑制体外氧化低密度脂蛋白诱导的单核细胞对内皮细胞的粘附机制.方法:采用酶联免疫法检测丙丁酚对内皮细胞粘附分子、细胞间粘附分子1(ICAM-1)、血管细胞粘附分子1 (VCAM-1)、P-选择素和E-选择素表达的影响,对比分析丙丁酚和上述粘附分子单克隆抗体抑制氧化低密度脂蛋白诱导的单核细胞对内皮细胞的粘附作用.结果:丙丁酚呈浓度依赖性抑制氧化低密度脂蛋白诱导的单核细胞对内皮细胞的粘附,丙丁酚浓度从10μmol/L增加到80μmol/L,单核细胞对内皮细胞的粘附从16.7％降低至7.0％(P<0.01),同时ICAM-1和P-选择素表达分别被抑制75％和72％(P相似文献   

阿托伐他汀对内皮细胞微粒诱导人脐静脉内皮细胞VCAM-1和ICAM-1表达的影响

目的:探讨阿托伐他汀对内皮细胞微粒(EMPs)诱导的人脐静脉内皮细胞(HUVECs)表达血管细胞粘附分子(VCAM)-1和细胞间粘附分子(ICAM)-1的影响。方法:取生长良好的第4,5代人脐静脉内皮细胞,将细胞分为3大组:对照组、EMPs组、EMPs+阿托伐他汀组。对照组加入培养基,EMPs组以不同浓度的EMPs(0/mL,1×102/mL,1×103/mL,1×104/mL,1×105/mL)与HUVECs共同孵育24 h,EMPs+阿托伐他汀组以不同浓度的阿托伐他汀(0.05,0.1,1.0,10μmol.L-1)与HUVECs作用1 h后,加入105/mL EMPs共同孵育24 h。分别采用实时荧光定量聚合酶链反应和蛋白免疫印迹方法检测VCAM-1和ICAM-1 mRNA和蛋白的表达。结果:HUVECs受EMPs刺激后,VCAM-1和ICAM-1 mRNA及蛋白表达呈浓度依赖性增加,阿托伐他汀可不同程度上抑制EMPs的作用。结论:阿托伐他汀抗动脉粥样硬化作用可能部分与抑制EMPs诱导的内皮细胞VCAM-1和ICAM-1的表达有关。     

金雀异黄素对低密度脂蛋白诱导的内皮细胞c-myc mRNA表达的影响(英文)

目的 :研究金雀异黄素对氧化型低密度脂蛋白诱导的人血管内皮细胞c mycmRNA表达的影响。方法 :低密度脂蛋白采用密度梯度超速离心法从健康人血浆中提取 ,经铜离子氧化制备成氧化型低密度脂蛋白。培养的人血管内皮细胞给予氧化型低密度脂蛋白 2 0 0mg·L- 1或同时给予金雀异黄素 10 0 μmol·L- 1诱导不同时间 (1,2 ,4h) ,提取细胞总RNA进行Northernblot杂交。结果 :2 0 0mg·L- 1氧化型低密度脂蛋白刺激内皮细胞c mycmR NA在 1h增加为对照水平的 3倍 ,2h增加为对照水平的 3.3倍 ,4h降到对照水平以下 ;给予氧化型低密度脂蛋白诱导的同时给予金雀异黄素 10 0 μmol·L- 1其c mycmRNA表达量在 1h为单独给予氧化型低密度脂蛋白诱导的 80 % ,2h为 6 0 %。结论 :金雀异黄素能有效抑制氧化型低密度脂蛋白诱导的人血管内皮细胞c mycmRNA表达增高     

金粉蕨素拮抗血管内皮细胞氧化应激损伤及机制

目的 :研究金粉蕨素 (onychin ,Ony)对血管内皮细胞氧化应激损伤的影响及可能机制。方法 :培养人脐静脉血管内皮细胞株 (ECV30 4 ) ,经Ony处理后 ,用过氧化氢 (H2 O2 )对其损伤 ;用MTT比色法和乳酸脱氢酶测定法分别检测损伤组和处理组细胞增殖活性和功能状态 ;用Western Blot法检测磷酸化ERK1 2和p38、P90RSK蛋白的表达。结果 :不同浓度的Ony(0 .3、1、3、10 μmol·L-1)促进H2 O2 损伤的内皮细胞增殖 ,减少LDH释放 ,并呈浓度依赖性。Ony(3μmol·L-1)抑制H2 O2 诱导的磷酸化p38表达 ,30min时最明显 ,但并不影响H2 O2 对ERK的激活以及ERK下游蛋白激酶P90RSK的表达。而阳性对照药genistein虽可增加内皮细胞增殖活性和减少功能损伤 ,但明显抑制H2 O2 诱导的磷酸化ERK表达及其下游蛋白激酶P90RSK。结论 :Ony拮抗血管内皮细胞氧化应激损伤可能与抑制p38磷酸化有关。     

采用重组人源CYP酶研究艾瑞昔布的体外羟基化代谢

目的 探讨新型抗炎镇痛药艾瑞昔布在人体内的羟基化代谢酶。方法 用体外重组的人源细胞色素P450（CYP）进行孵育代谢实验，液相色谱多级质谱法分析代谢产物和残留的母体药物，利用整体归一化法对4种CYP酶的代谢作用大小进行评估。结果 艾瑞昔布羟基化代谢可由CYP2C9，CYP2D6和CYP3A4催化，其各自作用大小分别为62.5%，21.1%和46.4%。结论 CYP2C9为艾瑞昔布羟基化的主要代谢酶。     

Effects of protein tyrosine kinase inhibitors on cytokine-induced adhesion molecule expression by human umbilical vein endothelial cells.

1. Endothelial cells can be stimulated by the pro-inflammatory cytokines interleukin (IL)-1 alpha and tumour necrosis factor (TNF) alpha to express the leukocyte adhesion molecules E-selectin, vascular cell adhesion molecule (VCAM)-1 and intercellular adhesion molecule (ICAM)-1 but the intracellular signalling mechanisms leading to this expression are incompletely understood. We have investigated the role of protein tyrosine kinases (PTK) in adhesion molecule expression by cytokine-activated human umbilical vein endothelial cells (HUVEC) using the PTK inhibitors genistein and herbimycin A, and the protein tyrosine phosphatase (PTP) inhibitor sodium orthovanadate. 2. Maximal E-selectin expression induced by incubation of HUVEC for 4 h with IL-1 alpha (100 u ml-1) and TNF alpha (100 u ml-1) was dose-dependently inhibited by genistein and herbimycin A. Although similar effects were seen on phorbol 12-myristate, 13-acetate (PMA)-induced expression, this was not due to inhibition of protein kinase C (PKC) activity as the selective inhibitors of PKC, bisindolylmaleimide (BIM), Ro31-7549 or Ro31-8220 did not affect IL-1 alpha- or TNF alpha-induced E-selectin expression at concentrations which maximally inhibited PMA-induced expression. 3. Genistein inhibited VCAM-1 expression induced by incubation of HUVEC for 24 h with TNF alpha or IL-1 alpha whereas it did not affect ICAM-1 expression induced by 24 h incubation with either of these cytokines. Herbimycin A inhibited both VCAM-1 and ICAM-1 expression induced by TNF alpha. 4. Basal expression of E-selectin, VCAM-1 and ICAM-1 was dose-dependently enhanced by sodium orthovanadate. In contrast, vanadate differentially affected TNF alpha-induced expression of these molecules with maximal E-selectin and ICAM-1 expression being slightly enhanced and VCAM-1 expression dose-dependently reduced. 5. We also studied the effects of PTK and PTP inhibitors on adhesion of the human pre-myeloid cell line U937 to TNF alpha-stimulated HUVEC. Adhesion of U937 cells to HUVEC pretreated for 4 or 24 h with TNF alpha was dose-dependently inhibited by genistein and herbimycin A but unaffected by daidzein. Adhesion of U937 cells after 4 h was partially inhibited by blocking antibodies against both E-selectin and VCAM-1 but after 24 h was only inhibited by anti-VCAM-1. 6. Sodium orthovanadate had no effect on TNF alpha-induced U937 adhesion but dose-dependently enhanced adhesion to unstimulated HUVEC. Vanadate-induced adhesion was inhibited by an antibody against VCAM-1. 7. These results demonstrate that PTK-mediated phosphorylation events are important for the regulation of adhesion molecule expression by human endothelial cells, and additionally show that PTK inhibitors differentially affect upregulation of different adhesion molecules, implicating divergent regulatory pathways for cytokine-induced adhesion molecule expression.     

Manassantin a and b isolated fromSaururus chinensis inhibit TNF-α-induced Cell adhesion molecule expression of human umbilical vein endothelial cells

Leukocyte adhesion to the vascular endothelium is a critical initiating step in inflammation and atherosclerosis. We have herein studied the effect of manassantin A (1) and B (2), dineolignans, on interaction of THP-1 monocytic cells and human umbilical vein endothelial cells (HUVEC) and expression of intercellular adhesion molecule-1 (ICAM-1), vascular cell adhesion molecule-1 (VCAM-1), and E-selectin in HUVEC. When HUVEC were pretreated with 1 and 2 followed by stimulation with TNF-alpha, adhesion of THP-1 cells to HUVEC decreased in dose-dependent manner with IC50 values of 5 ng/mL and 7 ng/mL, respectively, without cytotoxicity. Also, 1 and 2 inhibited TNF-alpha-induced up-regulation of ICAM-1, VCAM-1 and E-selectin. The present findings suggest that 1 and 2 prevent monocyte adhesion to HUVEC through the inhibition of ICAM-1, VCAM-1 and E-selectin expression stimulated by TNF-alpha, and may imply their usefulness for the prevention of atherosclerosis relevant to endothelial activation.     

槲皮素抑制血管生成作用的实验研究

目的　研究槲皮素 (Quercetin)对血管生成和培养的人脐静脉内皮细胞 (HUVEC)的影响。方法　采用生长因子 (血管内皮细胞生长因子VEGF、碱性成纤维细胞生长因子bFGF)诱导的鸡胚绒毛尿囊膜 (CAM)血管增生模型观察槲皮素对血管生成的影响 ;利用培养的HUVEC ,用MTT法观察槲皮素抑制内皮细胞增殖的作用 ;流式细胞仪观察槲皮素对HUVEC细胞周期的影响。结果　槲皮素 (0 1、0 0 5和 0 0 2 5mmol·L-1)能明显抑制VEGF诱导的CAM小血管生成 ;槲皮素 (0 1和 0 0 5mmol·L-1)能明显抑制bFGF诱导的CAM小血管生成 ;槲皮素 (2 4 0、12 0 μmol·L-1和 6 0 μmol·L-1)对内皮细胞增殖有抑制作用 ,抑制率分别为 6 7 0 %、5 8 1%和39 7% ;槲皮素 (2 4 0、12 0 μmol·L-1)能显著导致HUVEC的S、G2 期阻滞。结论　槲皮素能抑制VEGF和bFGF诱导的血管生成 ,且对内皮细胞增殖具有抑制作用。     

二苯乙烯苷对H_2O_2诱导血管内皮细胞黏附分子表达的影响

目的研究二苯乙烯苷(TSG)对过氧化氢(H2O2)诱导损伤的人脐静脉内皮细胞P-selectin、E-selectin、ICAM-1、VCAM-1和MCP-1表达的影响。方法体外培养人脐静脉内皮细胞,实验分为空白对照组、H2O2组、辛伐他汀组、TSG组,运用逆转录聚合酶链式反应和酶联免疫吸附试验分别检测P-selectin、E-selectin、ICAM-1、VCAM-1和MCP-1 mRNA与蛋白的表达。结果 200μmol·L-1的H2O2作用内皮细胞24 h后,P-selectin、E-selectin、ICAM-1、VCAM-1和MCP-1的mRNA和蛋白表达水平均明显上调;经TSG预处理内皮细胞4 h后,再加200μmol·L-1的H2O2作用内皮细胞24 h,结果显示:TSG能抑制H2O2诱导的内皮细胞P-selnecti、E-se-lectin、ICAM-1、VCAM-1和MCP-1的mRNA和蛋白的表达。结论 TSG可抑制H2O2诱导的人脐静脉内皮细胞黏附分子的表达。     

Testosterone and estradiol modulate TNF-alpha-induced expression of adhesion molecules in endothelial cells

Cytokine-activated endothelial expression of adhesion molecules plays an important role in immune responses. In the present study, we investigated the influences of testosterone and 17 beta-estradiol on tumor necrosis factor-alpha (TNF-alpha)-induced expression of adhesion molecules in human umbilical vein endothelial cells (HUVEC). HUVEC were incubated with TNF-alpha, testosterone or 17 beta-estradiol separately, or in a combination of TNF-alpha plus testosterone or 17 beta-estradiol. The expression of E-selectin, vascular cell adhesion molecule-1 (VCAM-1) and intercellular adhesion molecule-1 (ICAM-1) was evaluated at 3, 6, 12 and 24 h following exposure by flow cytometric analysis. The results showed that although testosterone or 17 beta-estradiol did not affect the expression of these adhesion molecules in unstimulated HUVEC, both of them transiently increased the expression of E-selectin and VCAM-1 in TNF-alpha stimulated HUVEC. Neither testosterone nor 17 beta-estradiol affected the expression of ICAM-1 induced by TNF-alpha. It is concluded that both testosterone and 17 beta-estradiol increase TNF-alpha-induced expression of E-selectin and VCAM-1 in endothelial cells and these facts might indicate a mechanism by which gonadal hormones can indirectly enhance immune responses.     

脑心通胶囊药效成分对人脐静脉内皮细胞JAK/STAT信号通路、血管活性物质、黏附分子、炎症因子的影响

目的:研究脑心通胶囊主要药效成分对人脐静脉内皮细胞(HUVEC)JAK/STAT信号通路、血管活性物质、黏附分子、炎症因子的影响,以期阐明脑心通胶囊活血化瘀的作用机制.方法:采用CCK-8法检测不同浓度的12个脑心通胶囊药效成分[咖啡酸(1.56～200μmol/L)、阿魏酸(1.56～200μg/mL)、洋川芎内酯H...     

Inhibition of γ-irradiation induced adhesion molecules and NO production by alginate in human endothelial cells

Inflammation is a frequent radiation-induced reaction following therapeutic irradiation. Treatment of human umbilical endothelial cells (HUVEC) with gamma-irradiation (gammaIR) induces the expression of adhesion proteins such as intercellular adhesion molecule-1 (ICAM-1), vascular cell adhesion molecule-1 (VCAM-1), and E-selectin. Since the upregulation of these proteins on endothelial cell surface has been known to be associated with inflammation, interfering with the expression of adhesion molecules is an important therapeutic target. In the present study, we demonstrate that high mannuronic acid-containing alginate (HMA) inhibits gammaIR induced expression of ICAM-1, VCAM-1, and E-selectin on HUVEC in a dose dependent manner. HMA also inhibited gammaIR induced production of Nitric oxide (NO). These data suggest that HMA has therapeutic potential for the treatment of various inflammatory disorder associated with an increase of endothelial leukocyte adhesion molecules.