溶血磷脂酰胆碱对内皮细胞一氧化氮的生成的影响

目的：探讨溶血磷脂酰胆碱（Lysophosphatidylcholine,Lyso-PC)对培养的人脐静脉内皮细胞（human umbilical vein endothelial cells,HUVECs)一氧化氮（nitric oxide,NO)的生成的影响。方法：采用NO酶法测定内皮细胞NO生成的变化。结果：内皮细胞NO的生成对Lyso-PC具有时间和剂量依赖性,结论：Lyso-PC可能通过抑制内皮细胞NO的生成而导致动脉粥样硬化损伤的形成。     

切应力和溶血磷脂酰胆碱对内皮细胞表面黏附分子表达的影响

在体内 ,内皮细胞的功能不仅受化学因子的调节 ,而且还受力学因素的影响。为探讨流体切应力和溶血磷脂酰胆碱 ( L ysophosphatidylcholine,L yso- PC)的双重作用对培养的人脐静脉内皮细胞 ( Hum an um bilical veinendothelial cells,HU VECs)表面黏附分子 ICAM- 1、VCAM- 1、E- selectin表达的影响 ,采用流式细胞仪技术检测了L yso- PC( 3 0 μg/m l)和流体切应力 ( 2 .2 3、4.2 0 dyne/cm2 )的协同作用下内皮细胞黏附分子表达的变化。结果显示 :在受剪切作用之前 ,用 L yso- PC孵育激活内皮细胞 ,或预先剪切后再用 L yso- PC孵育 ,内皮细胞的 ICAM- 1和VCAM- 1表达与两种刺激同时作用相比 ,显著增加 ( P<0 .0 5 ) ;切应力或 L yso- PC的单独作用 ,以及两种刺激同时存在对 HU VEC的 E- selectin表达无显著影响。而在受剪切作用之前 ,用 L yso- PC孵育激活内皮细胞 ,或预先剪切后再用 L yso- PC孵育 ,内皮细胞的 E- selectin表达与两种刺激同时作用相比 ,显著增加 ( P<0 .0 5 )。结论认为 :即使在不利于细胞黏附的力学环境中 ,流体切应力与 L yso- PC的协同作用 ,也可能是在炎症部位单核细胞对内皮细胞募集增加的重要原因之一     

川芎嗪对脑血管内皮细胞粘附分子ICAM—1表达的影响

川芎嗪对脑血管内皮细胞粘附分子ＩＣＡＭ－１表达的影响△刘勇许彦钢（西安医科大学神经生物学研究中心，西安７１００６１）粘附分子与脑血管病的发生、发展及防治有关。我们曾报道细胞因子ＴＮＦ－α－和ＩＬ－１β刺激培养脑血管内皮细胞ＩＣＡＭ－１表达增加，但有关...     

哮喘大鼠血清刺激下内皮细胞表面粘附分子ICAM—1的表达

近十五年人们才发现炎症是哮喘发病的病理基础,它以白细胞浸润为主要特征,过程由白细胞与内皮细胞表面粘附分子介导,ICAM－1就是其中之一,我们在前期活体动物实验中证实了哮喘动物肺组织中内皮细胞一白细胞粘附现象显著,并且肺组织ICAM－1高表达,这有可能是发病过程中ICAM－1大量表达于内皮细胞表面,导致内皮细胞一白细胞粘附增加的结果。本实验采用肺组织机械分离法体外培养大鼠肺内皮细胞,将哮喘病理血清与内皮细胞共同孵育,用于细胞粘附的体外研究,借助间接免疫荧光标记技术及流式细胞分离法,我们首先研究了受哮喘病理血清刺激后肺微血管内皮细胞表面ICAM－1表达的情况,结果发现,血清孵育的内皮细胞ICAM－1表达比用DMEM培养基培养的内皮细胞表达量高;哮喘血清刺激4h后ICAM－1表达量达到峰值,长于4h则很快降低;正常血清或培养基处理的内皮细胞表达持续在一个低水平。     

溶血磷脂胆碱对缺血心室肌电生理的影响

心肌缺血诱导的心律失常是冠心病死亡的主要原因。虽然已有大量动物研究探讨缺血期间产生心律失常的一些因素，但由于代谢紊乱导致心肌膜离子电导变化和心律紊乱，只是近年才被电生理学家广泛重视。溶血磷脂胆碱（ｌｙｓｏｐｈｏｓｐｈａｔｉｄｙｌｃｈｏｌｉｎｅ，ＬＰ...     

流体切应力对内皮细胞粘附分子表达的影响

在动脉粥样硬化(Atherosclerosis,As)的发生发展中各种白细胞,包括单核细胞对内皮细胞的粘附可能起着较为重要的作用。在体内,血流切应力对内皮细胞的形态和功能有重要影响。为了阐明流体切应力对内皮细胞表面粘附分子表达的影响,本文研究了流体切应力(2.23～6.08dyne/cm     

维生素C对抗外源性溶血磷脂酰胆碱所致的离体大鼠工作心脏类缺血再灌注损伤作用

目的 :观察维生素C的对抗外源性溶血磷脂酰胆碱(LPC)所致的离体大鼠工作心脏类缺血再灌注损伤作用。方法 :利用麻醉SD大鼠 ,制备离体大鼠工作心脏模型。C组 :用正常K H液连续灌注 35min ;L组 :用含 5 μmolLPC的K H液灌注 5min ,正常K H液再灌注 30min ;V组 :先用含 10 0 μmol维生素C的K H液灌注 5min ,再用含 5μmolLPC的K H液灌注 5min ,用含 15 0 μmol维生素C的K H液再灌注 30min。结果 :与C组相比 ,再灌后L组心功能指标均明显下降 ,室颤发生率提高 ,灌注液中乳酸脱氢酶(LDH)和丙二醛 (MDA)含量明显升高 ,心肌组织中超氧化物歧化酶 (SOD)活力明显降低。L组相比 ,V组心功能指标均明显升高 ,无室颤发生 ,灌注液中LDH和MDA含量明显降低 ,心肌组织中SOD活力变化不明显。结论 :维生素C对LPC所致的心肌类缺血再灌注损伤有明显的对抗作用。     

磷脂酰胆碱抗氧化效应及对遗传损伤的保护作用

磷脂酰胆碱５００ｍｇ／ｋｇ灌胃２０日可使Ｏ_３环境中的小鼠超氧化物歧化酶（ＳＯＤ）活性显著增强，血浆丙二醛（ＭＤＡ）含量及外周血正染红细胞（ＮＣＥ）微核率明显下降。结果提示：磷脂酰胆碱具有抗氧化作用及拮抗自由基造成遗传的损伤。进一步证实了自由基在微核形成中具有重要意义。     

流体切应力和Ox—LDL地内皮细胞表面ICAM—1表达的影响

目的研究动脉粥样硬化(AS)的危险因素高脂血症、流体切应力及二者共同作用对血管内皮细胞细胞间粘附分子-1(ICAM-1)表达的影响。方法以人脐静脉内皮细胞(HUVECs)为研究对象,应用免疫组化ACB方法,观测Ox-LDL、流体切应力及二者共同作用对HUVECs的粘附分子ICAM-1表达的影响。结果与对照组相比,(1)Ox-LDL显著增加HUVECs表面ICAM-1表达;(2)流体切应力使HUVECs表面ICAM-1表达增加,但ICAM-1的表达随时间依赖性增加的趋势不明显;(3)共同作用后,HUVECsICAM-1的表达较基础表达显著增加。结论Ox-LDL、流体切应力的改变及二者共同作用显著增加H-UVECs表面ICAM-1表达。     

NADPH氧化酶介导溶血性磷脂酰胆碱诱发的非对称二甲基精氨酸升高

目的:研究溶血性磷脂酰胆碱(LPC)诱导内源性一氧化氮合酶抑制物非对称二甲基精氨酸(ADMA)升高的机制。方法:LPC处理人脐静脉内皮细胞(HUVEC),检测活性氧、NO和ADMA水平,以及ADMA代谢酶甲基化蛋白转移酶(PRMT)的表达和二甲基精氨酸-二甲胺水解酶(DDAH)的活性。结果:LPC能显著升高活性氧和降低细胞活性;降低NO和升高ADMA水平;上调PRMT蛋白的表达和降低DDAH活性。NADPH氧化酶抑制剂di-phenyliodonium能抑制LPC的作用。结论:LPC诱发ADMA水平增高与其升高NADPH氧化酶活性,进而上调PRMT表达及降低DDAH活性有关。     

阻塞性睡眠呼吸暂停低通气综合征患者细胞粘附分子水平的研究

目的探讨细胞粘附分子在阻塞性睡眠呼吸暂停低通气综合症(OS-AHS)发病中的作用。方法应用酶联免疫吸附法(ELISA)检测30例老年OSAHS患者及30例老年健康对照者血清可溶性细胞间粘附分子-1(ICAM-1)、血管细胞粘附分子-1(VCAM-1)和E-选择素的含量。结果OSAHS组血清ICAM-1、VCAM-1、E-选择素含量分别为245.22±71.19ng/ml、24.01±4.79ng/ml、和86.58±48.02ng/ml,均明显高于健康对照组(P<0.01),且随OSAHS程度的加重而明显升高。ICAM-1、E-选择素水平与睡眠呼吸暂停低通气指数(AHI)呈明显正相关(P<0.01);I-CAM-1水平与最低血氧饱和度(SaO2min)呈明显负相关(P<0.01)。结论OSAHS患者血清中可溶性粘附分子ICAM-1、VCAM-1和E-选择素水平可作为反映OSAHS严重程度的敏感指标。     

sICAM-1和sVCAM-1与乙肝病毒标志物关系的研究

目的探讨可溶性血管内皮细胞问黏附分子1(sVCAM-1)和可溶性细胞问黏附分子1(sICAM-1)的水平与乙肝病毒标志物之间的关系。方法用ELISA法测定乙肝病毒标志物、sVCAM-1、sICAM-1，用PER法定量测定HBV-DNA的含量。结果HBVM阳性者，除HBsAb阳性者外，其血清sVCAM-1、sICAM-1水平较全阴性者均有较明显的升高，但升高的各组间无明显差异；sICAM-1与ALT呈正相关(r=0．652)，与HBA-DNA呈负相关(r=-0．498)；sVCAM-1与ALT、HBV-DNA的相关系数r分别为0．191、-0．027。结论1、乙肝病毒感染者血清sVCAM-1、sICAM-1有明显的升高，各组间无明显差异。2、sICAM-1的水平可以反应肝脏的损害程度和HBV-DNA的复制情况。     

Inhibition of endothelial cell adhesion molecule expression with SJC13, an azaindolidine derivative,in vitro

Stimulation of cultured human umbilical vein endothelial cells (HUVEC) with lipopolysaccharide (LPS) induces adherences for human promyelocytic cell line HL60. Adherence of HL60 cells to HUVEC stimulated with LPS for 4h was completely inhibited by pretreatment with SJC13, an azaindolidine derivative. The mechanism whereby SJC13 inhibits the adhesiveness of HUVEC was investigated. Pretreatment of SJC13 inhibited LPS-induced expression of E-selectin and vascular cell adhesion molecule-1 (VCAM-1), but not intercellular adhesion molecule-1 (ICAM-1), in HUVEC, determined by flow cytometry and cellular enzyme-linked immunosorbent assay (cell-ELISA). The inhibitory activity was concentration dependent between 62.5 and 1,000 g/ml. SJC13 also selectively inhibited LPS-induced increases in E-selectin and VACM-1 mRNAs, indicating that the action of SJC13 is to inhibit synthesis of these molecules. These data demonstrate that SJC13 is capable of selectively inhibiting the expression of E-selectin and VCAM-1, but not ICAM-1, in endothelial cells.accepted by I. Ahnfelt-Rønne     

Genetic and Environmental Determinants of Variation of Soluble Adhesion Molecules

In our research we examined the contribution of putative genetic sources on interindividual variation and cross-sectional correlations of several adhesion molecules, including intracellular (ICAM-1) and vascular cell adhesion molecules (VCAM-1) and E-selectin, in a population-based sample of ethnically homogeneous families of European origin. The plasma levels of these molecules were measured in 947 apparently healthy individuals from 217 nuclear families. Quantitative statistical-genetic analysis implementing the model fitting technique revealed significant parent/offspring and sibling correlations (p < 0.01) for all three molecules. The putative genetic effects explained 55.2 ± 7.2% (VCAM-1), 63.3 ± 7.5% (ICAM) and 63.8 ± 8.1% (E-selectin) of the variation. Common family environmental factors also significantly influenced the variation of E-selectin (13%) and VCAM-1 (28.6%). The main results of our bivariate analysis showed that the observed phenotypic correlations between ICAM-1 and VCAM-1, and between ICAM-1 and E-selectin, were mostly attributable to shared environmental factors (  r_E= 0.896  and 0.737, respectively; p < 0.01). However, the correlation between VCAM-1 and E-selectin was likely caused by common genetic effects  (r_G= 0.334, p < 0.05)  . Our results show that familial clustering of adhesion molecules is likely due to strong genetic effects, supplemented with shared environmental factors.     

Expression of E-selectin, intercellular adhesion molecule (ICAM)-1 and vascular cell adhesion molecule (VCAM)-1 in non-small-cell lung carcinoma

Vascular cell adhesion molecules (VCAM) play an important part in the regulation of inflammation and are considered to be important in the process of malignant tumour growth. The present study describes the immunohistochemical staining patterns of E-selectin, intercellular adhesion molecule (ICAM)-1 and VCAM-1 on endothelial cells of the vessels in tumour stroma and other cell types in non-small-cell lung carcinoma (NSCLC; n=43) in association with inflammatory cells. Expression of E-selectin was dominant on endothelial cells in the stromal areas of the tumour, especially at the borders, and was confined to endothelial cells. Moderate to strong staining for ICAM-1 was demonstrated on endothelial cells irrespective of size or localization of the vessels. Compared with ICAM-1, fewer vessels were positive for VCAM-1, and stained with lesser intensity. ICAM-1 expression was demonstrated on NSCLC cells, the basal cells of bronchial epithelium, type II pneumocytes, lymphocytes and fibroblasts. VCAM-1 was clearly expressed on NSCLC cells in 4 of the 43 cases and on lymphocytes and fibroblasts. The staining patterns observed on endothelial cells support the idea of an active status of NSCLC vessels. This phenotypic pattern looks similar to the vascular component of inflammation. The presence of ICAM-1 and VCAM-1 on NSCLC cells suggests a functional role in the process of chemotaxis for tumour cells.     

流体切应力对血管内皮细胞粘附分子ICAM-1的影响

目的 :探讨血液流动产生的切应力对白细胞 血管内皮细胞 (VEC)相互粘附所产生的影响及其在炎症、免疫反应、动脉粥样硬化发生发展中所起的重要作用。方法 :将已汇合的人脐静脉内皮细胞玻片放于平板流动腔中 ,以层流不同切应力 0 .6、1.2、2 .4Pa剪切不同时间 (2、8、12h) ,用免疫细胞化学方法检测VEC表面ICAM 1表达 ,以显微镜下计数阳性细胞率表示。结果 :稳层流切应力能上调HUVECICAM 1表达 ,切应力是内皮细胞粘附分子表达的调节因素之一。     

Renal Expression of Adhesion Molecules in Anca-Associated Disease

INTRODUCTION: Anti-neutrophil cytoplasmic autoantibodies (ANCA)-associated disease among other manifestations can underlie rapidly progressive glomerulonephritis (RPGN), with crescentic and necrotizing GN. Differences in pathogenic immune mechanisms in RPGN may provide differences in the renal expression of adhesion molecules mediating these lesions. METHODS: Renal intercellular adhesion molecule 1 (ICAM-1; CD54) and vascular cell adhesion molecule 1 (VCAM-1; CD106) were assessed in 40 patients with type I RPGN (anti-glomerular basement membrane antibodies, n = 4), type II (immune complexes, n = 17), and type III (ANCA, n = 19). Enzyme-linked immunosorbent assay (ELISA) for detection of immunoglobulin G antibodies against the Goodpasture's antigen and indirect immunofluorescence and ELISA for myeloperoxidase (MPO) and proteinase 3 (PR3) were performed for ANCA testing. Ten normal renal tissues were used as controls. Relationships between ICAM-1 and VCAM-1, histopathologic features, and CD18, CD14, and CD3 cells were analyzed. RESULTS: Abnormal ICAM-1 and VCAM-1 in tubule was seen in >80% of biopsies with RPGN. Abnormal VCAM-1 in glomerular tuft was seen in >60% of biopsies with RPGN. Glomerular ICAM-1 was associated with less glomerulosclerosis (chi (2) = 6.719, p = 0.01), less interstitial fibrosis (chi (2) = 4.322, p < 0.05), and less tubular atrophy (chi (2) = 8.547, p < 0.005). Glomerular VCAM-1 was associated with glomerular leukocyte infiltration (chi (2) = 4.698, p < 0.05). Glomerular tuft stains of ++/+++ for VCAM-1 was observed in 10% from MPO-ANCA-GN patients but in 60% from PR3-ANCA-GN (Fi = 8.538, p = 0.03). CONCLUSIONS: The following conclusions can be made from this study. (1) The renal expression of ICAM-1 and VCAM-1 is upregulated in RPGN, and this is associated with the histological activity. (2) De novo expression of VCAM-1 on glomerular tuft suggests that endothelial cells play a role in RPGN. (3) De novo tubular expression of ICAM-1 and VCAM-1 suggests that epithelial cells may participate in adhesive interactions in RPGN. (4) De novo expression of VCAM-1 at the glomerular tuft in PR3-ANCA positive patients seems greater than in MPO-ANCA positive patients, which suggests that testing specific immune activation mechanisms may play a role in ANCA-associated GN.