西洛他唑对人脐静脉内皮细胞血管细胞黏附分子1和细胞间黏附分子1mRNA表达的影响

目的观察西洛他唑对人脐静脉内皮细胞（HUVECs）血管细胞黏附分子1（VCAM-1）和细胞间黏附分子1（ICAM-1）mRNA表达的影响,探讨西洛他唑可能的抗动脉粥样硬化作用机制。方法将HUVECs用不同浓度的西洛他唑（0μg/L、0.05μg/L、0.1μg/L、1.0μg/L、10μg/L）溶液处理1小时后,用肿瘤坏死因子α（TNF-α）10μg/L诱导24小时。半定量复合逆转录聚合酶链反应（RT-PCR）测定黏附分子VCAM-1和ICAM-1mRNA的表达。结果 TNF-α能上调VCAM-1和ICAM-1的表达,西洛他唑在一定程度上可抑制上述作用,随着西洛他唑浓度的增加,ICAM-1mRNA表达水平逐步下降,分别为0.239±0.012、0.205±0.012、0.166±0.010、0.136±0.008,VCAM-1mRNA表达水平也逐步下降,分别为0.114±0.048、0.093±0.051、0.083±0.045、0.068±0.039。结论西洛他唑可抑制TNF-α诱导的HUVECs的黏附分子VCAM-1和ICAM-1mRNA表达,提示西洛他唑的抗动脉粥样硬化作用可能是通过阻止血单核细胞向血管内皮细胞聚集和黏附实现的。     

Increased binding of synovial T lymphocytes from rheumatoid arthritis to endothelial-leukocyte adhesion molecule-1 (ELAM-1) and vascular cell adhesion molecule-1 (VCAM-1).

The infiltration of the synovial membrane (SM) by mononuclear cells, mostly T cells, is a typical histopathological feature associated with rheumatoid arthritis (RA). The entry of T lymphocytes into the SM is believed to be mediated by a number of molecules in the endothelium that are induced in response to a series of inflammatory mediators. In this study, we have investigated the adhesion of synovial T cells from RA patients to two endothelial ligands: endothelial-leukocyte adhesion molecule-1 (ELAM-1), the only selectin known to function as a vascular addressin for T cells, and vascular cell adhesion molecule-1 (VCAM-1), the cellular ligand of VLA-4. Our results clearly demonstrate that synovial T cells isolated from both SM and synovial fluid (SF), bearing an activated and memory phenotype, displayed an enhanced capacity to interact with these two endothelial molecules as compared with T cells from peripheral blood (PB) either of the same RA patients or healthy donors. A further enhancement of VLA-4-mediated T cell binding to VCAM-1 and fibronectin could be observed when already in vivo-activated synovial T cells were stimulated in vitro with phorbol esters, suggesting the existence of several cellular affinity levels for both very late activation-4 (VLA-4) ligands. Moreover, both PB and synovial T cells from RA patients exhibited strong proliferative responses when they were cultured with either fibronectin or VCAM-1 in combination with submitogenic doses of anti-CD3 mAb. This increased endothelial binding ability of synovial T lymphocytes together with their proliferation in response to the interaction with VCAM-1 and fibronectin may represent important mechanisms in the regulation of T cell penetration and persistence in the chronically inflamed SM of RA.     

Carcinoembryonic antigen-related cell adhesion molecule 1 modulates vascular remodeling in vitro and in vivo

Carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1), a cellular adhesion molecule of the Ig superfamily, is associated with early stages of angiogenesis. In vitro, CEACAM1 regulates proliferation, migration, and differentiation of murine endothelial cells. To prove that CEACAM1 is functionally involved in the regulation of vascular remodeling in vivo, we analyzed 2 different genetic models: in Ceacam1-/- mice, the Ceacam1 gene was deleted systemically, and in CEACAM1(endo+) mice, CEACAM1 was overexpressed under the control of the endothelial cell-specific promoter of the Tie2 receptor tyrosine kinase. In Matrigel plug assays, Ceacam1-/- mice failed to establish new capillaries whereas in CEACAM1(endo+) mice the implants were vascularized extensively. After induction of hind limb ischemia by femoral artery ligation, Ceacam1-/- mice showed significantly reduced growth of arterioles and collateral blood flow compared with their WT littermates. In agreement with a causal role of CEACAM1 in vascular remodeling, CEACAM1(endo+) mice exhibited an increase in revascularization and collateral blood flow after arterial occlusion. Our findings indicate that CEACAM1 expression is important for the establishment of newly formed vessels in vivo. Hence CEACAM1 could be a future target for therapeutic manipulation of angiogenesis in disease.     

芪丹通脉片对动脉粥样硬化大鼠单个核细胞中细胞间黏附分子1及血管细胞黏附分子1 mRNA表达的影响

目的黏附分子的表达与动脉粥样硬化的发生发展有关.观察芪丹通脉片对实验性动脉粥样硬化大鼠外周血单个核细胞中细胞间黏附分子1和血管细胞黏附分子1 mRNA表达的影响. 方法模型构建、样品采集与分析分别于2003-03/06,2003-06/09在解放军第四军医大学实验动物中心、西京医院检验科分生实验中心完成.将健康雄性SD大鼠72只随机分为6组模型组、空白对照组、阳性对照辛伐他汀组、芪丹通脉片低剂量组、芪丹通脉片中剂量组、芪丹通脉片高剂量组,每组12只.采用高脂饮食配合口服维生素D3建立大鼠动脉粥样硬化模型,各组动物灌胃给药.采用半定量反转录聚合酶链反应的方法检测各组动物外周血单个核细胞中细胞间黏附分子1和血管细胞黏附分子1 mRNA的表达,分析造模及各药物组细胞间黏附分子1和血管细胞黏附分子1 mRNA表达的变化.结果72只大鼠均纳入实验结果分析.细胞间黏附分子1和血管细胞黏附分子1基因的表达模型组比空白对照组明显增加(1.37±0.08,1.40±0.06,P=0.000);辛伐他汀组及各中药组均明显低于模型组(P=0.000),且芪丹通脉片高剂量组的作用明显优于芪丹通脉片低剂量组(0.40±0.06,0.40±0.05;0.61±0.07,0.67±0.05,P=0.003,0.007). 结论高脂饮食能使细胞间黏附分子1和血管细胞黏附分子1的表达明显增加,而芪丹通脉片各剂量组可以不同程度地下调血管壁内细胞间黏附分子1和血管细胞黏附分子1的表达.而且芪丹通脉片高剂量组的作用效果明显优于低剂量组.     

芪丹通脉片对动脉粥样硬化大鼠单个核细胞中细胞间黏附分子1及血管细胞黏附分子1 mRNA表达的影响

目的：黏附分子的表达与动脉粥样硬化的发生发展有关。观察芪丹通脉片对实验性动脉粥样硬化大鼠外周血单个核细胞中细胞间黏附分子1和血管细胞黏附分子1 mRNA表达的影响。方法：模型构建、样品采集与分析分别于2003—03／06，2003—06／09在解放军第四军医大学实验动物中心、西京医院检验科分生实验中心完成。将健康雄性SD大鼠72只随机分为6组：模型组、空白对照组、阳性对照辛伐他汀组、芪丹通脉片低剂量组、芪丹通脉片中剂量组、芪丹通脉片高剂量组，每组12只。采用高脂饮食配合口服维生素耽建立大鼠动脉粥样硬化模型，各组动物灌胃给药。采用半定量反转录聚合酶链反应的方法检测各组动物外周血单个核细胞中细胞间黏附分子1和血管细胞黏附分子1 mRNA的表达，分析造模及各药物组细胞间黏附分子1和血管细胞黏附分子1 mRNA表达的变化。结果：72只大鼠均纳入实验结果分析。细胞间黏附分子1和血管细胞黏附分子1基因的表达：模型组比空白对照组明显增加（1．37&;#177;0．08，1．40&;#177;0．06,P=0．000）；辛伐他汀组及各中药组均明显低于模型组（P=0．000），且芪丹通脉片高剂量组的作用明显优于芪丹通脉片低剂量组（0．40&;#177;0．06，0．40&;#177;0．05；0．61&;#177;0．07，0．67&;#177;0．05。P=0．003．0．007）。结论：高脂饮食能使细胞间黏附分子1和血管细胞黏附分子1的表达明显增加，而芪丹通脉片各剂量组可以不同程度地下调血管壁内细胞间黏附分子1和血管细胞黏附分子1的表达。而且芪丹通脉片高剂量组的作用效果明显优于低剂量组。     

通心络对大鼠脑缺血再灌注模型微血管细胞间黏附分子1和血管细胞黏附分子1表达的影响

背景:现代医学发现通心络制剂除了具有抗凝和抑制血小板聚集作用外,对血管内皮细胞有一定的保护作用。目的:观察中药复方制剂通心络是否影响脑缺血再灌注动物模型黏附分子的表达。设计:随机对照实验。单位:解放军第二军医大学长征医院神经内科。材料:实验于2002-10/2003-01在解放军第二军医大学长征医院神经内科实验室完成。选择雄性SD大鼠25只,随机分为假手术组5只、模型组10只和通心络组10只。方法:线栓法制备大鼠大脑中动脉脑局灶性脑缺血再灌注模型,假手术组除将尼龙线插在颈外动脉接近颈内动脉分叉处外,其余同模型组。通心络组大鼠在缺血再灌注前给予通心络粉剂1.0g/(kg·d),溶在生理盐水中灌胃1周。模型组和假手术组灌胃等剂量生理盐水。各组大鼠麻醉后取脑制备切片,行常规苏木精-伊红染色、免疫组化及原位杂交染色。主要观察指标:①缺血再灌注后细胞间黏附分子1和血管细胞黏附分子1阳性微血管表达数目。②缺血再灌注后细胞间黏附分子1mRNA阳性微血管表达数目。结果:①假手术组手术侧大脑半球皮质和基底节区未见细胞间黏附分子1、血管细胞黏附分子1蛋白和细胞间黏附分子1mRNA阳性微血管表达。②模型组大鼠缺血2h再灌注6h后,缺血侧大脑细胞间黏附分子1、血管细胞黏附分子-1蛋白表达水平和细胞间黏附分子1mRNA表达水平显著升高。③通心络组缺血侧大脑半球皮质和基底节区蛋白和mRNA阳性微血管数较模型组显著降低犤(10.42±1.98),(12.42±2.14)/高倍视野;(8.54±2.00),(11.12±1.56)/高倍视野犦(P<0.05),血管细胞黏附分子1蛋白阳性微血管表达数目无显著变化(P>0.05)。结论:通心络可以降低大鼠脑缺血再灌注后细胞间黏附分子1的转录和翻译过程,有助于减轻脑缺血后的炎症性损伤过程。     

通心络对大鼠脑缺血再灌注模型微血管细胞间黏附分子1和血管细胞黏附分子1表达的影响

背景：现代医学发现通心络制剂除了具有抗凝和抑制血小板聚集作用外，对血管内皮细胞有一定的保护作用。目的：观察中药复方制剂通心络是否影响脑缺血再灌注动物模型黏附分子的表达。设计：随机对照实验。单位：解放军第二军医大学长征医院神经内科。材料：实验于2002—10／2003—01在解放军第二军医大学长征医院神经内科实验室完成。选择雄性SD大鼠25只，随机分为假手术组5只、模型组10只和通心络组10只。方法：线栓法制备大鼠大脑中动脉脑局灶性脑缺血再灌注模型，假手术组除将尼龙线插在颈外动脉接近颈内动脉分叉处外，其余同模型组。通心络组大鼠在缺血再灌注前给予通-15,络粉剂1．0g／（kg-d），溶在生理盐水中灌胃1周。模型组和假手术组灌胃等剂量生理盐水。各组大鼠麻醉后取脑制备切片．行常规苏木精-伊红染色、免疫组化及原位杂交染色。主要观察指标：①缺血再灌注后细胞间黏附分子1和血管细胞黏附分子1阳性微血管表达数目。②缺血再灌注后细胞间黏附分子1mRNA阳性微血管表达数目。结果：①假手术组手术侧大脑半球皮质和基底节区未见细胞间黏附分子1、血管细胞黏附分子1蛋白和细胞间黏附分子1mRNA阳性微血管表达。②模型组大鼠缺血2h再灌注6h后，缺血侧大脑细胞间黏附分子1、血管细胞黏附分子-1蛋白表达水平和细胞间黏附分子1mRNA表达水平显著升高。③通心络组缺血侧大脑半球皮质和基底节区蛋白和mRNA阳性微血管数较模型组显著降低[（10．42&;#177;1．98），（12．42&;#177;2．14）／高倍视野；（8．54&;#177;2．00），（11．12&;#177;1．56）／高倍视野]（P〈0．05），血管细胞黏附分子1蛋白阳性微血管表达数目无显著变化（P〉0．05）。结论：通心络可以降低大鼠脑缺血再灌注后细胞间黏附分子1的转录和翻译过程，有助于减轻脑缺血后的炎症性损伤过程。     

Early up-regulation of intercellular adhesion molecule-1 and vascular cell adhesion molecule-1 expression in rats with hemorrhagic shock and resuscitation.

This study evaluated the effect of resuscitation fluids on intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1). Sprague-Dawley rats (n = 36) were subjected to a 27 mL/kg hemorrhage over 5 min followed by a 1 h shock and 1 h resuscitation. Animals groups included: 1) cannulation only (Sham); 2) hemorrhage only (NR); 3) resuscitation with 1:1 shed blood (Blood); 4) resuscitation with 3:1 lactated Ringer's (81 mL/kg, 3LR+); 5) no hemorrhage but infusion with 3:1 lactated Ringer's (3LR); and 6) resuscitation with .36:1 hypertonic saline (7.5%, 9.7 mL/kg, HTS). At the end of resuscitation, the spleen and lung were harvested for detection of adhesion molecule mRNA and protein by RT-PCR and immunostaining. ICAM-1 and VCAM-1 expression exhibited the following pattern: 3LR+ > HTS approximate to 3LR > Blood approximate to NR approximate to Sham. VCAM-1 mRNA in the lung of the 3LR+ group was 2 or more times more than the groups of Sham, NR, Blood, and 3LR (p < .05). ICAM-1 and VCAM-1 mRNA in the spleen was significantly increased in the 3LR+ group compared with the groups of Sham, NR, and Blood (p < .05). Animals in the 3LR+ group showed enhanced staining for ICAM-1 in the pulmonary microvessels and in the marginal and trabecular areas of the spleen. Pulmonary edema and inflammatory cell infiltration were observed only in the 3LR+ group. In summary, resuscitation with LR following hemorrhagic shock induced immediate up-regulation of ICAM-1 and VCAM-1, which was associated with tissue injury. Thus, the type of resuscitation fluid used affected resuscitation injury.     

血清可溶性血管细胞黏附分子-1和可溶性细胞间黏附分子-1与2型糖尿病血管病变的相关性

目的 探讨血清可溶性血管细胞黏附分子-1（sVCAM-1）和可溶性细胞间黏附分子-1（siCAM-1）在2型糖尿病大、小血管病变中的作用。方法 应用酶联免疫吸附试验（ELISA）法检测了62例2型糖尿病患者血浆sVCAM-1和siCAM-1水平,并与20例健康人作对照。结果 糖尿病各组血清sVCAM-1和siCAM-1水平明显高于健康对照组（P〈0．01）,无血管病变组、微血管病变组和大血管病变组的含量逐步升高（P〈0．01）;逐步多元回归分析表明sICAM-1水平与血浆假性血友病因子（vWF）、甘油三酯（TG）、收缩压（SBP）、舒张压（DBP）呈正相关（r=0．43、0．45、0．52、0．62,均P〈0．01）;sVCAM-1水平与TG、胆固醇（TC）及尿白蛋白／肌酐（Alb／Cr）呈正相关（r=0．59、0．46、0．73,均P〈0．01）;多因素logistic回归分析表明sVCAM-1与是否惠有微血管病变显著相关（β=2．48,P〈0．05）,sICAM-1与是否惠有大血管病变显著相关（β=2．46,P〈0．05）。结论 sICAM-1和sVCAM-1参与了2型糖尿病血管病变的发生和发展,可作为早期2型糖尿病患者慢性血管并发症发生的预测及监测指标。     

Intercellular adhesion molecule-1 and vascular cell adhesion molecule-1 are increased in the plasma of children with sepsis-induced multiple organ failure

OBJECTIVES: To determine concentrations of circulating adhesion molecules endothelial (E)-selectin, intercellular adhesion molecule (ICAM)-1, and vascular cell adhesion molecule (VCAM)-1 in children with sepsis-induced multiple organ failure (MOF), and to determine associations among increased concentrations of these circulating adhesion molecules and important outcome measures. DESIGN: Prospective study. SETTING: University pediatric intensive care unit. PATIENTS: A total of 77 consecutive children with sepsis and 14 acutely ill children without sepsis. INTERVENTIONS: Plasma E-selectin, ICAM-1, and VCAM-1 concentrations and organ failure index (indicating number of failed organ systems) were determined in 77 children on days 1 and 3 of sepsis, and in 14 control children on pediatric intensive care unit day 1. Multivariate logistic regression analysis was used to determine associations between adhesion molecule concentrations and clinically relevant outcome measures. MEASUREMENTS AND RESULTS: Plasma concentrations of E-selectin, ICAM-1, and VCAM-1 were increased in children with sepsis vs. control on day 1 (p < .05). Plasma VCAM-1 (but not ICAM-1 or E-selectin) was increased in children with more than three organ failures vs. children with less than three organ failures (p < .05). Plasma ICAM-1 and VCAM-1 (but not E-selectin) concentrations independently predicted number of organs failed and development of more than three organ failures. Plasma ICAM-1 and VCAM-1 also predicted mortality and development of sequential (pulmonary/hepatic/renal) MOF (p < .05). CONCLUSIONS: The pronounced and persistent increase in plasma VCAM-1 and ICAM-1 that occurs in children with sepsis and persistent MOF may indicate a phenotypic change in endothelium toward a more proinflammatory state. Alternatively, the source for these adhesion molecules may be activated leukocytes and other cell types. Future studies are required to determine the role of ICAM-1 and VCAM-1 in the pathogenesis of sepsis-induced MOF.     

冠心病可溶性细胞间粘附分子-1的检测及其意义

目的 检测冠心病患者可溶性细胞间粘附分子－１（ｓＩＣＡＭ－１）的变化,探讨其在冠心病发病机理、病情监测中的意义。方法 用酶联免疫吸附法检测５０例急性心肌梗死（ＡＭＩ）、５０例不稳定性心绞痛（ＵＡ）、３０例稳定性心绞痛（ＳＡ）、３０例健康者血浆ｓＩＣＡＭ－１水平。结果 （１）ＡＭＩ、ＵＡ、ＳＡ患者ｓＩＣＡＭ－１水平均较正常对照组高,且三组间亦有显著差异。（２）ＡＭＩ患者按心功能分组,各组间亦有显著差     

Influence of single low-density lipoprotein apheresis on the adhesion molecules soluble vascular cellular adhesion molecule-1, soluble intercellular adhesion molecule-1, and P-selectin.

The aim of our study was to investigate the influence of single low-density lipoprotein apheresis (heparin extracorporeal low-density lipoprotein precipitation [HELP]procedure) on plasma concentrations of soluble adhesion molecules (sAMs) such as soluble vascular cellular adhesion molecule-1 (sVCAM-1), soluble intercellular adhesion molecule-1 (sICAM-1), and P-selectin in patients with familial heterozygous hypercholesterolemia and documented coronary artery disease enrolled in a chronic weekly HELP apheresis. Before HELP apheresis, the mean plasma concentration of sVCAM-1 was 515 +/- 119 ng/ml, 204 +/- 58 ng/ml for sICAM-1, and 112 +/- 45 ng/ml for P-selectin. After single HELP apheresis, plasma concentrations of sAM declined significantly by 32 +/- 7%, 18 +/- 15%, and 33 +/- 25% for sVCAM- 1,sICAM-1 and P-selectin, respectively. After a 1 week interval, sAM concentrations rose to approximately the initial values. The concentrations of all sAMs studied were significantly lower in the plasma leaving than entering the filter. Due to filtration, the decline in plasma level of sVCAM-1, sICAM-1, and P-selectin was 62 +/- 19%, 51 +/- 39%, and 67 +/- 22%, respectively. In addition to lipid reduction, single HELP apheresis significantly lowers plasma concentrations of sVCAM-1, sICAM-1, and P-selectin.     

Procainamide in vivo modulates suppressor T lymphocyte activity

Autoantibodies to histone and denatured DNA have been found in 80% of patients treated with procainamide. Of these 10 to 20% will eventually develop a Systemic Lupus Erythematosus-like syndrome. Although the mechanism by which procainamide exerts its effect is unknown, in vitro studies suggest that procainamide may inhibit suppressor T cell activity. We have studied the immune function of 18 patients receiving a two hour infusion of procainamide during transvenous catheter electrophysiologic studies. There was no difference between pre and post infusion samples with respect to T and B cell mitogenesis or pokeweed mitogen-induced immunoglobulin secretion. However, in seventeen of eighteen patients, there was a marked decrease in Concanavalin A-inducible suppressor cell activity. This decrease appeared to be related to the amount of procainamide infused as high dose samples showed less suppressor activity than low dose samples. Thus the data show that procainamide, when given in vivo, leads to a rapid and dose dependent decrease in suppressor cell activity.     

Priming effect of homocysteine on inducible vascular cell adhesion molecule-1 expression in endothelial cells

Hyperhomocysteinemia is an independent risk factor for the development of atherosclerosis, as well as for arterial and venous thrombosis. However, the mechanisms through which elevated circulating levels of homocysteine cause vascular injury and promote thrombosis remain unclear. Here, we tested the hypothesis that homocysteine (Hcy) sensitizes endothelial cells to the effect of inflammatory mediators. Human umbilical vein endothelial cells (HUVEC) were incubated with Hcy 1.0 mM for varying time points, and then treated in the absence or presence of 1.5 U/ml thrombin or 10 mg/ml lipopolysaccharide (LPS). Hcy alone had no effect on the expression of vascular cell adhesion molecule (VCAM)-1. However, Hcy enhanced thrombin- and LPS-mediated induction of VCAM-1 mRNA and protein levels. Consistent with these results, pretreatment of HUVEC with Hcy resulted in a two-fold increase in LSP-mediated induction of leukocyte adhesion. The latter effect was significantly inhibited by anti-VCAM-1 antibodies. Together, these findings suggest that Hcy sensitizes HUVEC to the effect of inflammatory mediators thrombin and LPS, at least in part through VCAM-1 expression and function.     

Intercellular adhesion molecule-1 is upregulated on peripheral blood T lymphocyte subsets in dual asthmatic responders.

To examine the role of adhesion molecules in T cell recruitment and activation during allergen-induced late asthmatic response (LAR), we evaluated the expression of lymphocyte function-associated antigen-1 alpha (LFA-1 alpha) and intercellular adhesion molecule-1 (ICAM-1) on peripheral blood T lymphocyte subsets from atopic asthmatic patients and their changes following allergen inhalation challenge. 12 atopic asthmatic patients were studied. Six patients showed only a single early response after allergen challenge, and six developed a dual response. At baseline, dual responders (DR) had a significantly higher expression of ICAM-1 on CD4+ and CD8+ T lymphocytes as compared with both single early responders (P < 0.005 and P < 0.02, respectively) and controls (P < 0.001, both comparisons). Allergen challenge was followed by a decrease of CD8+ ICAM-1+ T lymphocytes in all DR (P < 0.05) and of CD4+ ICAM-1+ T lymphocytes in four out of six DR, at the time of the LAR. At the same time, a significant rise in serum levels of the soluble form of ICAM-1 was observed in DR. These results suggest that peripheral blood immunoregulatory T lymphocytes are in a higher state of activation in DR as compared with early responders. The upregulation of ICAM-1 on these cells may be important in enhancing airway inflammation in patients with LAR.     

细胞间黏附分子1与移植肾急性排斥反应

目的:检测移植肾组织内细胞间黏附分子1的表达水平,分析其与移植肾急性排斥反应的关系.方法:选择解放军南京军区福州总医院全军器官移植研究所在2002/2005进行的72例尸体肾移植的移植肾穿刺活检标本72份,其中移植肾急性排斥反应54份,环孢素A中毒标本18份;并取8份正常肾组织作对照.采用免疫组化技术检测细胞间黏附分子1在移植肾内的表达,分析其与病理形态结构的关系.结果:发生急性排斥反应的受者肾小管上皮细胞间黏附分子1表达显著高于正常者及环孢素A中毒受者(P<0.05),且随移植肾排斥程度加重,细胞间黏附分子1表达明显增多(P<0.05).结论:细胞间黏附分子1的表达与移植肾急性排斥反应病理分级密切相关,移植肾组织内细胞间黏附分子1的检测对于肾移植后急性排斥反应的诊断具有参考价值.     

B7H costimulates clonal expansion of, and cognate destruction of tumor cells by, CD8(+) T lymphocytes in vivo.

B7H/B7RP (hereby called B7H) is a new member of the B7 family of costimulatory molecules and interacts with inducible costimulatory molecule (ICOS). Its function for CD8 T cells has not been reported. We report here that expression of B7H on the tumor cells reduced tumorigenicity and induced immunity to subsequent challenge with parental tumor cells. The immune protection correlates with an enhanced cytotoxic T lymphocyte (CTL) response against P1A, the major tumor antigen expressed in the J558 tumor. To understand the mechanism of immune protection, we adoptively transferred transgenic T cells specific for tumor antigen P1A into mice that bore P1A-expressing tumors. We found that while the transgenic T cells divided faster in mice bearing the B7H(+) tumors, optimal B7H-induced clonal expansion of P1CTL required costimulation by B7-1 and B7-2 on the endogenous host antigen-presenting cells (APCs). Interestingly, when B7H(+) and B7H(-) tumors were coinjected, P1CTL selectively eliminated the B7H(+) tumor cells. Moreover, B7H expressed on the tumor cells made them highly susceptible to destruction by CTL in vivo, even if the CTL was administrated into mice with large tumor burdens. Tumors that recurred in the P1CTL-treated mice lost transfected B7H and/or H-2L(d), the class I molecule that presents the P1A peptide. Taken together, our results reveal that B7H costimulates clonal expansion of, and cognate destruction by CD8(+) T lymphocytes in vivo.     

可溶性细胞间黏附分子-1与类风湿关节炎的相关性研究

目的进一步探讨可溶性细胞间黏附分子-1（sICAM-1）在类风湿关节炎（RA）中的作用。方法采用放射免疫测定法对34例RA患者及30例健康体检者血清、关节液中sICAM-1进行检测。结果所测静脉血清sICAM-1浓度,RA组显著高于健康对照组,差异有统计学意义（P〈0．001）;RA未治疗组显著高于治疗后未复发组,差异有统计学意义（P〈0．001）,但与治疗后复发组比较,差异无统计学意义（P〉0．05）;RA患者关节液中sICAM-1明显高于血清中的水平,二者差异有统计学意义（P〈0．05）,而未治疗组与治疗后复发组关节液中sICAM-1水平差异无统计学意义（P〉0．05）。结论sICAM-1在RA发病中起着重要作用,可作为判断病情严重性的指标用于监测RA的活动及疗效。     

Intercellular adhesion molecule-1 dimerization and its consequences for adhesion mediated by lymphocyte function associated-1

Intercellular adhesion molecule-1 (ICAM-1, CD54) is a ligand for the integrins lymphocyte function associated-1 (LFA-1, CD11a/CD18) and complement receptor-3 (Mac-1, CD11b/CD18) making it an important participant in many immune and inflammatory processes. Modified recombinant soluble ICAM-1 formed dimers. This result indicated that the ectodomain of ICAM-1 contains homophilic interaction sites. Soluble ICAM-1 dimers bind to solid-phase purified LFA-1 with high avidity (dissociation constant [Kd] = 8 nM) in contrast to soluble ICAM-1 monomers whose binding was not measurable. Cell surface ICAM-1 was found to be dimeric based on two distinct criteria. First, a monoclonal antibody specific for monomeric soluble ICAM-1, CA7, binds normal ICAM- 1 poorly at the cell surface; this antibody, however, binds strongly to two mutant forms of ICAM-1 when expressed at the cell surface, thus identifying elements required for dimer formation. Second, chemical cross-linking of cell surface ICAM-1 on transfected cells and tumor necrosis factor-activated endothelial cells results in conversion of a portion of ICAM-1 to a covalent dimer. Cell surface ICAM-1 dimers are more potent ligands for LFA-1-dependent adhesion than ICAM-1 monomers. While many extracellular matrix-associated ligands of integrins are multimeric, this is the first evidence of specific, functionally important homodimerization of a cell surface integrin ligand.