PGA1对缺氧再给氧大鼠心脏微血管内皮细胞ICAM-1表达的影响

目的　研究前列腺素A1(PGA1)对缺氧再给氧大鼠心脏微血管内皮细胞ICAM 1表达的影响。方法　培养大鼠心脏微血管内皮细胞,建立细胞缺氧再给氧模型,通过凝胶电泳迁移率(EMSA)测定内皮细胞NF κB的活性,采用酶联免疫吸附试验(ELISA)测定内皮细胞粘附分子ICAM 1的蛋白表达,Northernblot分析测定ICAM 1mRNA的表达。结果　大鼠心脏微血管内皮细胞在缺氧刺激后NF κB活性显著增加,ICAM 1的蛋白和ICAM 1mRNA的表达明显增加,再给氧后升高更明显;PGA1处理组NF κB活性较缺氧再给氧组明显下降(P<0 01),ICAM 1的蛋白和ICAM 1mRNA表达明显下降(P<0 01),呈剂量依赖效应。结论　前列腺素A1通过NF κB介导,下调内皮细胞ICAM 1的蛋白和mRNA表达。     

葛根素对缺氧复氧心脏微血管内皮细胞的保护作用

目的:探讨葛根素在心脏微血管内皮细胞(cardiac microvascular endothelial cell,CMEC)缺氧复氧损伤中的作用。方法:将CMEC随机分为空白组、模型组、葛根素低、中、高剂量(25,50,100 mg·L^-1)共3组。四甲基偶氮唑(methylthiazolyl tetrazolium,MTT)法检测细胞活力,流式细胞仪检测细胞凋亡,比色法检测乳酸脱氢酶(lactate dehydrogenase,LDH)活性、丙二醛(malondialdehyde,MDA)含量及超氧化物歧化酶(superoxide dismutase,SOD)活性,Western blot法检测Caspase-3和Bcl-2蛋白表达。结果:葛根素预处理后,缺氧复氧CMEC细胞活力增强,细胞凋亡率、LDH活性及MDA含量降低,SOD活性增强,Caspase-3蛋白表达减少,Bcl-2蛋白表达增加。结论:葛根素可拮抗缺氧复氧所致的CMEC损伤,可能与其抗氧化及抗凋亡活性相关。     

白细胞介素—1α诱导脑血管内皮细胞与单核细胞的粘附和迁移及 …

研究细胞因子ＩＬ－１α影响单核细胞与体外培养的牛脑微血管内皮细胞粘 ,迁移的动力学过程及药物的保护作用。方法 利用培养在胶原层上的内皮细胞单层,对粘附于内皮细胞单层上的ＭＮＣ及胶原层中的ＭＮＣ计数,计算ＭＮＣ粘附率及迁移率。结果 ＩＬ－１α可促进ＭＮＣ与ＢＣＭＥＣ的粘附与迁移,其促粘附与迁移作用具明显的时效关系。     

银杏提取物对培养的脑微血管内皮细胞与单核细胞和中性粒细胞 …

AIM: To study the action of Ginkgo biloba extract (GbE) on tumor necrosis factor (TNF-alpha)-induced adhesion of monocytes (Mon) and neutrophils (Neu) to cultured cerebral microvascular endothelial cells. METHODS: TNF-alpha-induced endothelial adhesivity toward Mon and Neu was studied using bovine cerebral microvascular endothelial cells (BCMEC) in vitro. The number of Mon and Neu adhering to the BCMEC monolayers was determined by flow cytometry. RESULTS: Pretreatment of BCMEC with TNF-alpha increased Mon and Neu adhesion to BCMEC from 12.5% +/- 0.2% to 31.3% +/- 0.5% and from 13.8% +/- 0.4% to 32.1% +/- 0.5%, respectively. GbE (1-100 mg.L-1) inhibited the effect of TNF-alpha in a concentration-dependent manner. E-selectin mAb (1 mg.L-1) blocked Mon and Neu adhesion to BCMEC induced by TNF-alpha. CONCLUSION: The inhibition of GbE on Mon and Neu adhesion to BCMEC was mediated through the suppression of E-selection expression.     

丹酚酸B与三七总皂苷配伍对缺氧复氧内皮细胞粘附分子-1表达及对中性粒细胞与内皮细胞粘附率的影响研究

目的研究丹酚酸B与三七总皂苷配伍对缺氧复氧内皮细胞粘附分子-1(ICAM-1)表达及对中性粒细胞与内皮细胞粘附率的影响。方法体外建立大鼠心脏微血管内皮细胞缺氧再给氧模型,采用流式细胞仪(FCM)检测内皮细胞ICAM-1阳性细胞百分比及平均荧光强度;龙胆紫染色法检测中性粒细胞与血管内皮细胞粘附率。结果内皮细胞缺氧复氧后ICAM-1阳性细胞比例显著增加,ICAM-1平均荧光强度显著升高;150、450μg/L剂量组显著抑制ICAM-1表达和中性粒细胞与内皮细胞粘附率。结论丹酚酸B与三七总皂苷配伍对缺氧复氧内皮细胞ICAM-1表达具有抑制作用,可降低中性粒细胞与内皮细胞粘附率,对内皮细胞损伤具有一定的保护作用。     

重组人白介素-1对大鼠微血管白细胞滚动与粘附的作用

目的：研究重组人白介素－１α（ＩＬ－１）对大鼠微血管白细胞的滚动与粘附作用。方法：采用高倍显微电视放大技术观察大鼠脊斜肌微循环标本白细胞的变化。结果：ＩＬ－１（０．１２５～０．７５ｍｇ·ｋｇ－１）ｉｐ后显著促进微血管中白细胞的滚动与粘附，有明显的量效关系。白细胞的滚动在给药（０．５ｍｇ·ｋｇ－１）３ｍｉｎ后从正常４±１增至７８±９．０个·ｍｉｎ－１。粘附于微血管壁的白细胞在ＩＬ－１给药３０ｍｉｎ后，从正常每８０μｍ血管１．０±１．０增至１４．０±３．０个。结论：ＩＬ－１促进大鼠脊斜肌微循环中的白细胞滚动与粘附。     

Effects of hypoxia/reoxygenation and cytokines on adhesion of leukocytes to cerebral microvascular endothelial cells 1

目的：研究缺氧／再给氧（Ｈ／Ｒ）对中性粒细胞（Ｎｅｕ）和单核细胞（Ｍｏｎ）与诱导的培养牛脑微血管细胞粘附作用的影响．方法：牛脑微血管内皮细胞（ＣＭＥＣ）和平滑肌细胞（ＣＭＳＭＣ）经Ｈ／Ｒ处理或经ＴＮＦα和ＩＬ１α刺激,Ｍｏｎ和Ｎｅｕ与ＣＭＥＣ和ＣＭＳＭＣ粘附的细胞数目用流式细胞仪测定．结果：ＣＭＥＣ先缺氧２ｈ再经复氧与ＴＮＦα（２μｇ·Ｌ－１）作用２ｈ,Ｍｏｎ和Ｎｅｕ与ＣＭＥＣ的粘附率分别提高到３５０％±０９％和３６０％±０６％（ＴＮＦα处理组分别是２８９％±１１％和２８８％±１３％）．ＣＭＳＭＣ也按上述处理,Ｍｏｎ和Ｎｅｕ的粘附率分别显著提高为４９９％±０４％和４３９％±１４％（ＴＮＦα处理组分别为３４０％±１９％和３４０％±１３％）．ＣＭＥＣ和ＣＭＳＭＣ经ＩＬ１α刺激,可得到类似结果．结论：Ｈ／Ｒ提高Ｍｏｎ和Ｎｅｕ与ＴＮＦα和ＩＬ１α诱导的ＣＭＥＣ和ＣＭＳＭＣ的粘附作用．     

钙拮抗剂调节钙非依赖磷脂酶A_2拮抗心脏微血管内皮细胞缺氧/复氧损伤的研究

目的探讨经典钙拮抗剂维拉帕米(Ver)、硝苯地平(Nif)、地尔硫(Dil)及本课题组合成的新型钙拮抗剂-碘化N-正丁基氟哌啶醇(F_2)通过调节钙非依赖磷脂酶A_2(iPLA_2)抗心脏微血管内皮细胞(CMECs)缺氧/复氧(H/R)损伤的作用与机制。方法培养大鼠原代CMECs,制作H/R模型,在H/R的基础上,用不同浓度梯度的钙拮抗剂及F_2处理细胞,比色法测定细胞培养上清液中乳酸脱氢酶(LDH)的漏出反映细胞损伤程度;酶联免疫吸附法(ELISA)测定白介素-6(IL-6)和花生四烯酸(AA)的含量;TUNEL法检测细胞晚期凋亡水平;Real-time PCR检测iPLA_2mRNA表达,Western blot检测iPLA_2蛋白表达。结果钙拮抗剂F_2、Ver和Nif均可量效-依赖性地减少H/R过程中LDH漏出(P<0.05),降低IL-6和AA含量(P<0.05),减少细胞凋亡(P<0.05),而Dil对上述指标均无作用;同时,F_2和Ver均可量效-依赖性地降低iPLA_2mRNA和蛋白表达水平,Nif和Dil对H/R过程中iPLA_2mRNA和蛋白表达水平并无影响。结论H/R可导致CMECs损伤,钙拮抗剂F_2、Ver、Nif能保护CMECs抗H/R损伤,Dil无抗H/R损伤的作用;而F_2和Ver是部分通过调节iPLA_2抗H/R损伤作用的。     

Adenovirus viral interleukin-10 inhibits adhesion molecule expressions induced by hypoxia/reoxygenation in cerebrovascular endothelial cells

AIM: To investigate the effects of recombinant adenovirus encoding viral interleukin-10 (vIL-10), a potent anti-inflammatory cytokine, on adhesion molecule expressions and the adhesion rates of leukocytes to endothelial cells in cerebrovascular endothelial cells injured by hypoxia/reoxygenation (H/R). METHODS: A recombinant adenovirus expressing vIL-10 (Ad/vIL-10 (or the green fluorescent protein (Ad/GFP) gene was constructed. A cerebrovascular endothelial cell line bEnd.3 was pretreated with a different multiplicity of infection (MOI) of Ad/vIL-10 or Ad/GFP and then exposed to hypoxia for 9 h followed by reoxygenation for 12 h. The culture supernatants were tested for the expression of vIL-10 and endogenous murine IL-10 (mIL-10) by ELISA. The effects of Ad/vIL-10 on monocyte-endothelial cell adhesion were represented as the adhesion rate. Subsequently, the expressions of intercellular adhesion molecule 1(ICAM-1) and vascular cell adhesion molecule 1( VCAM-1) in the endothelial cells after treatment with Ad/vIL-10 and H/R were analyzed by Western blotting and real-time PCR. RESULTS: vIL-10 was expressed in cultured bEnd.3 after Ad/vIL-10 transfection and was significantly increased by H/R. Ad/vIL-10 or Ad/GFP did not affect the mIL-10 level. H/R increased the mIL-10 expression, but insignificantly. Monocyte- endothelial cell adhesion induced by H/R was significantly inhibited by pretreatment with Ad/vIL-10(MOI:80). ICAM-1, and VCAM-1 in bEnd.3 and were significantly increased after H/R, while pretreatment with Ad/vIL-10 (MOI: 80) significantly inhibited their expressions. Ad/GFP did not markedly affect monocyte- endothelial adhesion and the expressions of ICAM-1 and VCAM-1 induced by H/R. CONCLUSION: Ad/vIL-10 significantly inhibits the upregulation of endothelial adhesion molecule expressions and the increase of adhesion of monocytes- endothelial cells induced by H/R, indicating that vIL-10 gene transfer is of farreaching significance in the therapy of cerebrovascular inflammatory diseases, and anti-adhesion treatment may reduce H/R injury.     

丹酚酸B对缺氧损伤心脏微血管内皮细胞细胞间粘附分子表达的影响

目的 :探讨丹参有效成分丹酚酸B在心脏微血管内皮细胞 (CMEC)缺氧 /复氧损伤中的保护作用。方法 :通过心脏微血管内皮细胞体外培养技术 ,建立缺氧预适应 (HPC)模型并给予丹酚酸B ,应用酶联免疫方法检测细胞间粘附分子 1(ICAM 1)表达。结果 :在CMEC缺氧 3h ,复氧 6h后ICAM 1表达升高 ;缺氧预适应和应用丹酚酸B对CMEC进行预处理则能有效降低CMECICAM 1的表达。结论 :丹酚酸B在CMEC缺氧 /复氧损伤中可产生与缺氧预适应类似的保护效果。     

缺氧对人微血管内皮细胞HIF-VEGF-Notch信号通路的影响

目的：观察缺氧对人微血管内皮细胞(HMVEC)中HIF-VEGF-Notch信号通路相关分子表达的影响。方法常规方法培养HMVEC细胞,低氧培养箱制备HMVEC缺氧模型,正常细胞作为对照组。采用Western Blot法检测HMVEC中HIF-1α及Notch-1的蛋白表达,ELISA法检测细胞培养上清液中VEGF蛋白表达水平。结果缺氧组和对照组细胞中Notch1蛋白表达分别为2.07±0.16和0.91±0.04,两者差异有显著意义（P<0.05）;HIF-1α蛋白表达缺氧组为2.53±0.19,对照组为0.67±0.08,差异有统计学意义（P<0.05）。对照组上清液中VEGF表达量为50.04±5.92 ng/L,缺氧组上清液中VEGF表达量为238.04±19.29 ng/L,两者差异有统计学意义（P<0.05）。结论缺氧可上调HMVEC细胞中HIF-VEGF-Notch信号通路相关分子的表达,此可能与重要脏器缺血缺氧性损伤后诱导的血管新生有关。     

葛根素对外周血内皮祖细胞缺氧/复氧损伤的保护作用

目的：研究葛根素对外周血内皮祖细胞（EPCs）缺氧/复氧损伤的保护作用。方法：采用密度梯度离心法和贴壁培养法相结合,使用专用培养基EGM-2,成功分离纯化EPCs,通过形态学、细胞表面分子标志物检测、内皮祖细胞吞噬功能对其鉴定;采用Krebs液建立缺氧/复氧损伤模型,用葛根素干预后,采用MTT法测定细胞活力、2,4-二硝基苯肼显色法测定细胞外乳酸脱氢酶（LDH）释放量、黄嘌呤氧化酶法测定细胞内超氧化物歧化酶（SOD）活性、硫代巴比妥酸法测定丙二醛（MDA）含量、硝酸还原酶法测定一氧化氮（NO）含量;Western blot法考察胞核、胞质Nrf2和全细胞HO-1蛋白表达。结果：与模型组相比,葛根素20.8 mg·L^-1及41.6 mg·L^-1组显著提高细胞活力（P<0.05,P<0.01）;葛根素20.8 mg·L^-1及41.6 mg·L^-1能显著降低NO、MDA含量和LDH释放量（P<0.01）;葛根素20.8 mg·L^-1,41.6 mg·L^-1,83.2 mg·L^-1均显著提高缺氧/复氧后细胞SOD活性（P<0.01）,并上调细胞HO-1、胞核Nrf2蛋白表达（P<0.01）,显著降低胞浆Nrf2蛋白表达（P<0.01）。结论：葛根素可显著拮抗缺氧/复氧对EPCs的损伤,可能与其抑制细胞过氧化损伤,增强细胞抗氧化能力有关。     

银杏提取物对培养的脑微血管内皮细胞与单核细胞和中性粒细胞粘附的拮抗作用(英文)

目的:探讨银杏叶提取物(GbE)对培养的新生牛脑微血管细胞(BCMEC)和大鼠血单核细胞(Mon),中性粒细胞(Neu)粘附的影响及可能机制,方法:用流式细胞仪测定粘附到肿瘤坏死因子(TNF-α)诱导培养的BCMEC上的单核细胞,中性粒细胞数目.结果:BCMEC经TNF-α处理后,使Mon粘附到BCMEC的百分率从12.5％±0.2％增加到31.3％±0.5％,Neu粘附率也增加到32.1％±0.5％(对照组为13.8％±0.4％).用GbE(1-100 mg·L~(-1))预处理BCMEC后,再用TNF-α诱导,则GbE剂量依赖性地抑制TNF-α的作用,用抗E-选择素单克隆抗体与TNF-α共孵育BCMEC后,TNF-α的诱导作用被明显阻断,结论:GbE使脑微血管内皮细胞减少E-选择素表达,进而抑制Mon,Neu与BCMEC的粘附。     

C -reactive protein induced expression of adhesion molecules in cultured cerebral microvascular endothelial cells

AIM lsehemic stroke can trigger an acute phase response resulting in a rise of plasma concentration of C - reactive protein （CRP）. Clinical data about the relationship between CRP and prognosis suggest that CRP might be involved in the pathogenesis of cerebral ischemia. To determine the possible role of CRP in ischemic stroke, we performed a dose - dependent experiment in mouse brain microvascular endothelial cells （bEnd. 3 cells） with emphasis on its relation to cell adhesions molecules.