Effects of angiotensin Ⅱ on human umbilical vein endothelial cells senescence and the telomerase activity

目的 观察血管紧张素Ⅱ(angiotensinⅡ,AngⅡ)对人脐静脉内皮细胞(human umbilical vein endothelial cell,HUVECs)衰老的诱导作用及对端粒酶活性的影响.方法 体外培养HUVECs,采用CCK-8法检测细胞存活率,用AngⅡ(终浓度10-6 mol/L)干预,分为对照组和AngⅡ诱导组.β-半乳糖苷酶活性采用免疫化学染色方法,流式细胞术检测细胞周期来反映细胞的增殖能力;用聚合酶链反应-酶联免疫吸附法(PCR-ELISA)检测端粒酶活性.结果 与对照组比较,10-6 mol/L AngⅡ诱导组存活的细胞数为对照组的(77.15±6.83)%;(71.10±6.81)%的细胞呈现β-半乳糖苷酶阳性染色,流式细胞仪检测细胞周期多停滞于G0/G1期[(84.11±7.92)%],证实细胞衰老;与对照组相比,10-6 mol/L AngⅡ诱导组端粒酶活性明显下降(P<0.01).结论 AngⅡ可以诱导HUVECs衰老,其机制可能与抑制衰老细胞端粒酶活性有关.     

Effect of surfactant protein A on lipopolysaccharide-induced tumor necrosis factor-α expression in human proximal tubular epithelial cells

Background Surfactant protein A （SP-A） contributes to the regulation of sepsis-induced acute lung injury.In a previous study,we demonstrated the expression and localization of SP-A in the kidneys.The present study evaluated the effect of SP-A on lipopolysaccharide （LPS）-induced tumor necrosis factor-α （TNF-α） expression and its underlying mechanisms in the human renal tubular epithelial （HK-2） cells.Methods Indirect immunofiuorescence assay was used to detect SP-A distribution and expression in HK-2 cells.HK-2 cells were treated with various concentrations of LPS （0,0.1,1,2,5,and 10 mg/L） for 8 hours and with 5 mg/L LPS for different times （0,2,4,8,16,and 24 hours） to determine the effects of LPS on SP-A and TNF-α expression.Then,HK-2 cells were transfected with SP-A siRNA to analyze nuclear factor κB （NF-κB） P65 and TNF-α expression of HK-2 cells after LPS-treatment.Results Indirect immunofluorescence assay revealed that SP-A is localized to the membrane and cytoplasm of HK-2 cells.Interestingly,SP-A1/SP-A2 and TNF-α expression were found to be significantly increased in HK-2 cells upon LPS treatment.Transfection of LPS-treated HK-2 cells with SP-A siRNA resulted in significant increases in the levels of NF-κB P65 protein and TNF-α mRNA and protein compared to those in non-transfected LPS-treated HK-2 cells.Conclusion SP-A plays an important role in protecting cells against sepsis-induced acute kidney injury by inhibiting NF-κB activity to modulate LPS-induced increase in TNF-α expression.     

Interleukin-13 inhibits cytokines synthesis by blocking nuclear factor-κB and c-Jun N-terminal kinase in human mesangial cells

Objective： Monocytes/macrophages, proinflammatory cytokines and chemokines are important in the pathogenesis of glomerulonephritis. Interleukin （IL） -13 has been shown to exert potent anti-inflammatory properties. This study was designed to investigate the effect of IL-13 on the expression of proinflammatory cytokines, chemokines and profibrogenic cytokines and the involved molecular mechanism in cultured human mesangial cells （HMCs）. Methods： The expressions of proinflammatory cytokines, chemokines and profibrogenic cytokines were determined by ribonuclease protection assay （RPA）. Activity of nuclear factor-kappa B （NF-κB） and activa- tor protein-1 （AP-1） was examined by electrophoretic mobility shift assay （EMSA）. NF-κB subunit p65 nuclear transportation and c-Jun N-terminal kinase （JNK） activity were assayed by immunoblot. Results： Recombinant IL-13 inhibited tumor necrosis factor-α （TNF-u）, IL-1α, IL-1β, monocyte chemoattractant protein-1 （MCP-1）, IL-8, and transforming growth factor-β1 （TGF-β1） mRNA expressions in a dose-dependent manner. Lipopoly- sacchorides （LPS） dramatically increased NF-κB DNA binding activity of HMCs, which was inhibited by IL-13 in a dose-dependent manner. LPS-activated NF-κB contained p50 and p65 dimers, but not c-Rel subunit. IL-13 blocked LPS-induced NF-κB subunit p65. LPS stimulated JNK/AP-1 activation, which was inhibited by IL-13 in a dose-dependent manner. Conclusion： IL-13 inhibits proinflammatory cytokines, chemokines, and profibrogenic cytokines synthesis by blocking NF-κB and JNK/AP-1 activation. These observations point to the importance of IL-13 in the modulation of inflammatory processes in the renal glomerulus.     

肿瘤坏死因子α对人脐静脉内皮样细胞增殖及syndecan-4蛋白表达的影响

目的 观察肿瘤坏死因子α(TNF-α)对体外培养的人脐静脉内皮样细胞株ECV304增殖及syndecan-4蛋白表达的影响.方法 体外培养人脐静脉内皮样细胞株ECV304,分别应用1、10、20、100 ng/ml的TNF-α作用24 h及36 h并设立对照组进行比较,采用MTS/PES法确定人脐静脉内皮样细胞的增殖状态.利用Western blotting蛋白免疫印迹法测定细胞syndecan-4蛋白的表达情况.结果 24 h各组细胞增殖率分别为对照组(1.956±0.214),TNF-α100 ng/ml组(2.154±0.250),TNF-α20 ng/ml组(2.26±0.151),TNF-α10 ng/ml组(2.118±0.205),TNF-α1 ng/ml组(2.106±0.136).统计分析显示低至1 ng/ml的TNF-α仍能明显刺激人脐静脉内皮样细胞的增殖(P＜0.05),其中以TNF-α 20 ng/ml组细胞增殖最显著P＜0.05).36 h各剂量组的细胞增殖率均明显低于24 h的细胞增殖率(P＜0.05).TNF-α对人脐静脉内皮样细胞的syndecan-4蛋白表达有显著的增强作用(P＜0.05).结论 TNF-α对体外培养的人脐静脉内皮样细胞的增殖及syndecan-4蛋白表达均有明显的促进作用,但随着时间的改变,这种作用有所变化.     

The influence of Paeoniflorin and recombinant human type Ⅱ tumor necrosis factor receptor-antibody fusion protein on human synovial cells and part mechanism

目的 观察重组人Ⅱ型肿瘤坏死因子受体-抗体融合蛋白(rhTNFR:Fc)与芍药苷(Pae)联合应用对人成纤维样滑膜细胞(FLS)增殖的影响,探讨其对肿瘤坏死因子受体(TNFR)信号通路的调节作用.方法 经知情同意,收集行髋关节置换术患者正常滑膜组织,采用组织块培养法对人滑膜细胞进行培养.取第3代人FLS,用肿瘤坏死因子α(TNF-α,20 μg/L)刺激,分别用rhTNFR:Fc(10 mg/L)、Pae(10-5 mol/L)及二者联合干预.MTT法检测人FLS的增殖反应,免疫组化法半定量分析肿瘤坏死因子受体1(TNFR1)、肿瘤坏死因子受体相关因子2(TRAF2)、肿瘤坏死因子受体相关死亡结构蛋白(TRADD)在FLS中的表达情况.结果 rhTNFR:Fc与Pae联合用药对FLS增殖的抑制作用优于rhTNFR:Fc和Pae单独给药组.rhTNFR:Fc、Pae及联合用药均能明显下调FLS 中TNFR1和TRAF2表达,上调TRADD表达;与单独用药相比,联合用药能进一步上调TRADD表达,而对TNFR1和TRAF2的表达无明显影响.结论 rhTNFR:Fc和Pae联合用药对人FLS增殖的抑制作用优于单独给药,其作用机制可能与调节TRADD有关.     

Variations of tumor necrosis factor-α, leptin and adiponectin in mid-trimester of gestational diabetes mellitus

Background Many cytokines have been found to increase the insulin resistance during pregnancy complicated by glucose metabolism disorder. This study aimed to investigate which comes first, the changes of some cytokines or the abnormal glucose metabolism.
Methods This nested case-control study was undertaken from January 2004 to March 2005. Twenty-two women with gestational diabetes mellitus （GDM）, 10 with gestational impaired glucose tolerance （GIGT）, and 20 healthy pregnant women were chosen from the women who had visited the antenatal clinics and had blood samples prospectively taken and kept during their visit. The levels of tumor necrosis factor-α （TNF-α）, leptin and adiponectin were determined. One-way ANOVA analysis and bivariate correlation analysis were used to assess the laboratory results and their relationship with body mass index （BMI）. Results Women with GDM have the highest values of TNF-α and leptin and the lowest value of adiponectin compared with those with GIGT and the healthy controls （P 〈0.01） at 14-20 weeks of gestation. This was also found when these women progressed to 24-32 weeks. The significantly increased levels of TNF-α and leptin and the decreased level of adiponectin were found at the different periods of gestation within the same group. Positive correlation was shown between the levels of TNF-α and leptin at the two periods of gestation with the BMI at 14-20 weeks, while adiponectin was negatively correlated （P 〈0.05）.
Conclusions The concentrations of TNF-α, leptin and adiponectin may change before the appearance of the abnormal glucose level during pregnancy. Further studies are required to verify the mechanism of this alteration and whether the three cytokines can be predictors for GDM at an early staqe of preqnancy.     

Cardiotrophin-1 induces intercellular adhesion molecule-1 expression by nuclear factor κB activation in human umbilical vein endothelial cells

Background In addition to elevated concentrations of cytokines, patients with congestive endothelial dysfunction and increased plasma concentrations of adhesion molecules heart failure （CHF） show ke intercellular adhesion molecule-1 （ICAM-1）. Furthermore, the concentration of cardiotrophin-1 （CT-1） - a cytokine of the interleukin-6 superfamily - is increased in CHF. We tested the hypothesis whether CT-1 is able to induce ICAM-1 in human umbilical vein endothelial cells （HUVEC）. Furthermore we examined the signalling mechanisms of CT-1 mediated ICAM-1 expression. Methods Confluent layers of HUVEC were incubated with increasing concentrations of CT-1 （5 to 100 ng/ml） for different periods. ICAM-1 mRNA was determined by real-time polymerase chain reaction （PCR） and ICAM-1 surface expression by fluorescence-activated cell sorter （FACS） analysis and soluble ICAM-1 （slCAM-1） in the culture supernatant by enzyme linked immunosorbent assay （ELISA）. To clarify the signalling pathway of CT-1 induced ICAM-1 expression we used various inhibitors of possible signal transducing molecules, electromobility shift assay （EMSA） and Western blot analysis. Results CT-1 induced ICAM-1 mRNA （1.8±0.8 fold increase compared to unstimulated cells after 6 hours） and protein （1.4±0.2 fold increase compared to unstimulated cells after 48 hours） in HUVEC in a time- and concentration-dependent manner. EMSA experiments show that CT-1 causes nuclear factor （NF） κB activation. Because parthenolide could inhibit CT-1 induced ICAM-1 expression NFκB activation is required in this pathway. CT-1 did not activate extracellular signal regulated kinases （ERK）, c-Jun N-terminal kinase （JNK） and p38. Conclusion CT-1 is able to induce ICAM-1 in endothelial cells by NFκB activation. These results may explain in part elevated ICAM-1 concentrations in patients with CHF and endothelial dysfunction.     

肿瘤坏死因子α作用后脐静脉内皮细胞质内钙离子的变化

目的 :观察不同浓度肿瘤坏死因子α(TNF α)对培养人脐静脉内皮细胞质内钙离子变化的影响。　方法 :用Fluo 3作为钙指示剂 ,用激光共聚焦显微镜观察测定不同浓度TNF α作用后脐静脉内皮细胞质内钙离子 [Ca2 ]i的变化。　结果 :① 10 5U/mlTNF α刺激后 ,脐静脉内皮细胞内 [Ca2 ]i水平迅速升高。随着TNF α刺激浓度的下降 ,内皮细胞内 [Ca2 ]i升高波峰亦逐渐下降 ,10 2 U/mlTNF α作用后内皮细胞内 [Ca2 ]i水平无显著变化。②用D Hanks液平衡后 ,10 5U/mlTNF α刺激后脐静脉内皮细胞内 [Ca2 ]i的水平迅速下降 ,随着TNF α刺激浓度的下降 ,内皮细胞内 [Ca2 ]i下降波峰亦逐渐减缓 ;与此同时 ,细胞外液中Ca2 水平逐渐升高。③用EGTA预处理后 ,不同浓度TNF α作用后脐静脉内皮细胞质内外Ca2 水平无显著变化。　结论 :TNF α可使内皮细胞膜钙离子通透性增高 ,可能与其致凋亡或细胞毒功能有关     

肿瘤坏死因子-α对人脐静脉内皮细胞中组织蛋白酶K表达的影响

目的：观察不同浓度肿瘤坏死因子-α（ TNF-α）和不同TNF-α作用时间对人脐静脉内皮细胞（ HUVEC ）中组织蛋白酶K（Cat K）表达的影响。方法取对数生长期HUVEC进行实验。将HUVEC分为正常对照组、0．1 ng／ml TNF-α组、1 ng／ml TNF-α组、10 ng／ml TNF-α组、100 ng／ml TNF-α组,分别采用DMEM培养基、0．1 ng／ml TNF-α、1 ng／ml TNF-α、10 ng／ml TNF-α、100 ng／ml TNF-α作用24 h。另取HUVEC分为对照组、TNF-α6 h组、TNF-α12 h组、TNF-α24 h组、TNF-α48 h组,对照组DMEM培养基作用24 h,其他组采用10 ng／ml TNF-α作用相应时间。检测各组HUVEC 中的Cat K mRNA和蛋白的表达情况。结果与正常对照组比较,不同TNF-α浓度组的Cat K mRNA和Cat K蛋白表达水平均升高（P＜0．05）。0．1 ng／ml TNF-α组、1 ng／ml TNF-α组、10 ng／ml TNF-α组 Cat K mRNA 和 Cat K 蛋白的表达水平依次增高（P＜0．05）,100 ng／ml TNF-α组Cat K mRNA和Cat K蛋白表达水平较10 ng／ml TNF-α组下降（P＜0．05）。与对照组比较,TNF-α各作用时间组Cat K mRNA和Cat K蛋白的表达水平增高（P＜0．05）;TNF-α6 h组、TNF-α12 h组、TNF-α24 h组Cat K mRNA和Cat K蛋白的表达水平依次增高（P＜0．05）;TNF-α48 h组Cat K mRNA和Cat K蛋白的表达水平较TNF-α24 h组明显下降（P＜0．05）。结论在一定作用浓度及作用时间内,TNF-α可以呈剂量和时间依赖性刺激HUVEC中Cat K表达。 TNF-α可能通过促进Cat K的表达促进动脉硬化的发生。     

细胞因子通过P-38信号通路对内皮细胞蛋白C受体的调节

目的观察肿瘤坏死因子-（TNF-）、白介素-1（IL-1）、干扰素-（IFN-）及白介素-4（IL-4）培养的人脐静脉内皮细胞（HUVEC）内皮细胞蛋白C受体（EPCR）和磷酸化P38（P-P38）的表达。方法分别采用逆转录聚合酶链反应（RT-PCR）、WESTERNBLOT技术测定正常对照组、TNF-组、IL-1组、IFN-组及IL-4组培养的EPCR mRNA、蛋白及P-P38蛋白的表达。结果TNF-组、IL-1组EPCR mRNA含量均较正常对照组低（P〈0.01）。IL-1组、TNF-组EPCR蛋白含量较正常对照组低（P〈0.01或P〈0.05）。TNF-组、IL-1组磷酸化P38蛋白含量均较正常对照组高（P〈0.01）。结论细胞因子TNF-、IL-1可以从基因、蛋白水平减少HUVEC上EPCR的表达,其调节机制可能是通过P38丝裂原活化蛋白激酶途径实现的。     

TNF-α对人脐静脉内皮细胞中NO和eNOS的影响

目的 讨论肿瘤坏死因子-α（TNF—α）对内皮细胞一氧化氮（NO）产生及内皮型一氧化氮合酶（eNOS）活性的影响。方法 以人脐静脉内皮细胞（HUVEC）为实验材料，检测与不同浓度TNF—α作用不同时间后．细胞培养上清液和细胞中NO水平的变化，以及细胞eNOS活性的改变。结果 （1）随着TNF—α浓度的升高，eNOS的活性减弱，而细胞和上清液中NO的含量增加；（2）随着干预时间的延长，eNOS的活性减弱；而细胞和上清液中NO的含量在作用24h后升高，且明显高于对照组；（3）L一单甲基精氨酸（L—NMMA）和地塞米松（DXM）均能阻断TNF-α引起的细胞和细胞上清中NO的表达增加。结论 TNF-α降低eNOS活性，却在高浓度和长时间作用后增加NO的合成，可能与激活诱导型一氧化氮合酶有关，因为NO的变化可以被L—NMMA和DXM阻断。     

姜黄素对TNF-α诱导的HUVEC表达ICAM-1的调节作用

目的 :细胞间黏附分子(intercellular adhesion molecule,ICAM)-1在炎症性肠病患者肠道炎症的发生中起着十分重要的作用。肿瘤坏死因子(tumor necrosis factor,TNF)-α可诱导内皮细胞ICAM-1的过度表达。本研究通过姜黄素干预人脐静脉内皮细胞(human umbilical vein endothelial cells,HUVEC),观察姜黄素是否能够影响TNF-α诱导ICAM-1的表达。方法:从新生儿脐带中获取HUVEC进行原代培养,取第3~5代的细胞,并将其分成3个实验组:空白对照组,不做处理;TNF-α组,加入10 ng/ml TNF-α干预3 h;姜黄素组,先加入10μmol/L姜黄素干预2 h,再加入10 ng/ml TNF-α干预3 h。通过流式细胞仪检测3组HUVEC细胞表面ICAM-1的表达量;同时通过免疫荧光技术观察3组细胞表达ICAM-1的荧光强度;Real-time PCR技术检测3组细胞中ICAM-1 m RNA的表达。结果:1流式细胞检测发现,TNF-α组中HUVEC表面ICAM-1的表达较空白对照组明显增加[(88.69±3.14)%vs(9.82±1.21)%,P<0.01];姜黄素组中ICAM-1表达[(41.85±8.39)%]较TNF-α组明显下降(P<0.01),但高于空白对照组(P<0.01);2免疫荧光检测也显示,TNF-α组中HUVEC细胞表面ICAM-1的表达强度明显高于空白对照组,而姜黄素组ICAM-1的表达强度较TNF-α组减弱。3Real-time PCR显示,TNF-α组中ICAM-1 m RNA的表达较空白对照组增加(34.70±14.99 vs 1.03±0.26,P<0.05);姜黄素组中ICAM-1 m RNA表达(15.34±8.42)较TNF-α组下降(P<0.01),比空白对照组增加(P<0.05)。结论:姜黄素可抑制TNF-α诱导的HUVEC表面ICAM-1蛋白的表达,这与其能够抑制细胞内ICAM-1 m RNA的表达有关。     

姜黄素减弱TNF-α刺激的人脐静脉内皮细胞的炎症反应

炎症和内皮细胞机能障碍是动脉粥样硬化的关键早期事件。研究了姜黄素对肿瘤坏死因子(TNF)-α刺激的人脐静脉内皮细胞(HUVEC)的保护作用,以了解姜黄素对内皮细胞的抗炎作用的途径,为防治细胞因子诱导的内皮细胞机能障碍提供新方法。以 MTT 法检测了姜黄素对 HUVEC 的细胞毒     

Expression of interleukin-15 and its receptor on the surface of stimulated human umbilical vein endothelial cells

Summary： Human interleukin-15 （hIL-15） is an important cytokine to activate endothelial cells and can be regulated by many other cytokines. The aim of this study is to examine the ability of interferon-γ （IFN-γ）, and tumor necrosis factor-or （TNF-α to induce the production of human interleukin-15 （hIL-15） and IL-15 receptor （IL-15Rα by human umbilical vein endothelial cells （HUVECs）. The data are summarized as follows： 1. Northern blot revealed that IL-15 mRNA was up-regulated by IFN-γ and TNF-α 2. Intracellular IL-15 protein was visualized by fluorescence microscopy, whereas the expression of IL-15 on the surface of HUVECs was detected by fluorescence activated cell sorting （FACS）, and no detectable IL-15 in the medium was verified by ELISA. 3. IL-15Rα was detected on the surface of HUVECs by FACS after IFN-α and TNF-α stimulation, whereas Western blotting revealed that the elevated expression on surface IL-15Rα was not due to the increased protein expression. The conclusion demonstrated from our results is that IFN-α and TNF-α play an important role in regulating the expression of IL-15 and IL-15Rα on the surface of HUVECs.     

炎症因子对人脐静脉内皮细胞表达血管内皮生长因子及妊娠相关血浆蛋白-A的影响

目的 探讨炎症因子白细胞介素-1β(IL-1β)、肿瘤坏死因子-α（TNF-α）对人脐静脉内皮细胞(HUVEC) 血管内皮生长因子（VEGF）、妊娠相关血浆蛋白-A（PAPP-A）表达的影响。方法 采用酶联免疫吸附法(ELISA法)测定正常对照组、IL-1β刺激组、TNF-α刺激组、IL-1β+VEGF受体拮抗剂（SU5416）组、TNF-α+VEGF受体拮抗剂（SU5416）组细胞上清液中VEGF、PAPP-A浓度。结果 ELISA结果显示培养的人脐静脉内皮细胞能低水平地表达VEGF、PAPP-A。IL-1β刺激组VEGF、PAPP-A的浓度均明显高于对照组[(VEGF( 279.09±6.341)pg/mlVS (41.124±0.918) pg/ml, P＜0.01;PAPP-A(8.842±0.426)ng/mlVS (6.049±0.729) ng/ml, P＜0.01)];TNF-α刺激组VEGF、PAPP-A的浓度均明显高于对照组[(VEGF(135.379±11.684) pg/mlVS (41.124±0.918) pg/ml, P＜0.01;PAPP-A (8.063±0.426) ng/mlVS (6.049±0.729) ng/ml, P＜0.01)];且IL-1β与TNF-α引起的增强效应不同,在炎症因子中加入SU5416,VEGF和PAPP-A的表达均显著减少,差异均有统计学意义（P＜0.01)。结论 静息状态下HUVEC表达极少量的VEGF、PAPP-A,炎性刺激可诱发VEGF、PAPP-A高表达,且VEGF与PAPP-A的表达有一定的相关性,VEGF的减少引起相应PAPP-A的减少,说明炎症和新生血管的形成在动脉粥样硬化形成过程中具有相互的作用。     

黄连素对肿瘤坏死因子TNF-α介导的炎症作用机理研究

[目的]探讨黄连素抑制HUVEC中TNF-α引起的细胞炎症的发生。[方法]分别培养HUVEC和A7r5细胞,不同药物浓度处理后,提取HUVEC mRNA,用实时荧光定量PCR测定VCAM-1表达水平;用虎红染色法检测HUVEC和人单核细胞（THP-1）的黏附性;用细胞迁移和MTT增殖实验分别检测黄连素对A7r5迁移和增殖作用的影响。[结果]黄连素预处理能有效阻止TNF-α诱导的VCAM-1mRNA增高,并减弱由其导致的THP-1对HUVEC的黏附性增加,同时抑制由TNF-α诱导的平滑肌细胞的迁移和增值作用。[结论]黄连素对炎症及心血管疾病有潜在的治疗作用。     

TNF-α对人脐静脉内皮细胞t-pA、pAI-1表达的研究

目的：观察肿瘤坏死因子-α（tumor necrosis factor-α,TNF-α）对人脐静脉内皮细胞（HUVECs）组织型纤溶酶原激活物（tissue plasminogen activitor,t-PA）及其抑制剂-1（plasminogen activitor inhibitor-1,PAI-1）表达的影响。方法：原代分离HUVECs细胞并进行传代培养,分别以6个TNF-α浓度组（0、1、10、20、50、100 ng·m L-1）处理不同时间（0、1、3、6、12、24 h）,酶联免疫吸附分析（ELISA）法测定t-PA、PAI-1抗原的表达;逆转-聚合酶链反应（RTPCR）检测t-PA、PAI-1基因的表达。结果：TNF-α促进PAI-1抗原的表达,并呈剂量和时间依赖关系,在TNF-α10 ng·m L-1作用6 h时最明显（P〈0.01）;TNF-α促进PAI-1 mRNA的表达,并呈剂量和时间依赖关系,在TNF-α10 ng·m L-1作用3 h时已非常明显（P〈0.01）,6 h时达到高峰（P〈0.01）;而TNF-α对HUVECs表达t-PA抗原、mRNA无明显影响。结论：炎症因子TNF-α可能通过上调PAI-1表达而诱发血栓相关疾病。     

DFMG对TNF-α诱导的人脐静脉内皮细胞CD40/CD40L相互作用的影响

目的:观察7-二氟甲氧基-5,4’-二甲氧基金雀异黄素(DFMG)对肿瘤坏死因子-α(TNF-α)诱导人脐静脉内皮细胞(HUVE-12)损伤模型的保护作用,探讨其保护作用的发挥是否与抑制CD40/CD40L相互作用相关。方法:体外培养人脐静脉内皮细胞(HUVE-12),20ng/mL TNF-α孵育诱导细胞损伤模型;加入不同浓度的DFMG,台盼蓝拒染法检测细胞活力、AnnexinⅤ-FITC/PI双染色流式细胞术检测细胞凋亡、流式细胞仪检测CD40/CD40L的表达。结果:DFMG呈浓度依赖性的升高TNF-α诱导的HUVEC-12细胞存活率;DFMG呈浓度依赖性的降低TNF-α诱导的HUVEC-12细胞凋亡;DFMG呈浓度依赖性降低CD40/CD40L表达。结论:DFMG保护TNF-α诱导的HUVEC-12细胞损伤,这种保护作用可能是通过抑制CD40/CD40L的表达发挥作用的。     

银杏叶提取物抗肿瘤坏死因子-α诱导的人肾小管上皮细胞凋亡及机制

目的 研究银杏叶提取物(extract of ginkgo biloba,EGB)抵抗肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)诱导的人肾小管上皮细胞凋亡及其作用机制.方法 将人肾小管上皮细胞分成4组:对照组,TNF-α组,EGB TNF-α组,EGB组,各组细胞培养至80%～90%汇合时加入相应药物干预. 采用MTT法检测TNF-α对细胞的毒性作用, 通过细胞形态学检测(AO/EB染色)和流式细胞仪计数测定细胞凋亡发生情况,Western blot法测定细胞凋亡相关蛋白Bcl-2、Bax的表达.结果 TNF-α对人肾小管上皮细胞的毒性作用呈剂量和时间依赖性;TNF-α(10 μg/ml)可显著诱导人肾小管上皮细胞凋亡,而EGB(50 mg/ml)可明显抑制它的作用, 同时Western blot测定显示EGB可显著上调Bcl-2的表达而下调Bax的表达.结论 EGB可以显著抑制TNF-α诱导的人肾小管上皮细胞凋亡,此作用可能与其上调抗凋亡蛋白Bcl-2的表达和下调促凋亡蛋白Bax的表达有关.     

氟伐他汀对内脏脂肪素诱导的内皮细胞间黏附因子-1表达的影响

目的 探讨不同浓度的氟伐他汀对内脏脂肪素(visfatin)诱导的人脐静脉内皮细胞(HUVECs)细胞间黏附因子-1(ICAM-1)mRNA表达的影响.方法 体外培养HUVECs,待细胞生长到融合状态时加入不同浓度的氟伐他汀(10-5～10-7 mol/L)孵育20 min,后加入visfatin(800 ng/ml)作用24 h,采用逆转录-聚合酶链反应(RT-PCR)技术测定ICAM-1mRNA的表达.结果 不同浓度的氟伐他汀可浓度依赖性的抑制visfatin诱导的ICAM-1mRNA的表达(P<0.05) .结论 氟伐他汀可有效阻止visfatin介导的炎症反应,具有抗炎作用,可预防动脉粥样硬化的发生.