OX-LDL诱导内皮细胞条件培养液对内皮细胞VCAM-1和ICAM-1的影响

目的探讨受损内皮细胞的自分泌和旁分泌对内皮细胞自身的影响。方法利用正常内皮细胞条件培养液和用氧化型低密度脂蛋白(OX-LDL)诱导内皮细胞的条件培养液分别作用于正常内皮细胞和受损内皮细胞,用酶联免疫细胞化学法检测血管内皮细胞黏附分子-1(VCAM-1)和细胞间黏附分子-1(ICAM-1)表达的变化。结果正常内皮细胞的条件培养液和OX-LDL诱导的内皮细胞条件培养液对正常内皮细胞VCAM-1和ICAM-1的表达作用不明显(P>0.05),而对受损内皮细胞VCAM-1和ICAM-1的表达具有明显的下调作用(P<0.01)。结论正常和受到氧化损伤的内皮细胞的自分泌和旁分泌作用对正常内皮细胞黏附分子没有影响,而对受损内皮细胞黏附分子有下调作用,说明内皮细胞可通过下调黏附分子的表达来实现自身的抗损伤作用。     

血管生长素-1基因修饰骨髓间充质干细胞对黏附因子表达的影响

目的探讨血管生长素1(Ang1)基因转导的骨髓间充质干细胞(Ang1-rMSC)对内皮细胞黏附因子表达的影响。方法经慢病毒载体介导构建Ang1-rMSC,观察VEGF刺激下不同时间点人脐静脉血管内皮细胞(HUVEC)黏附分子VCAM-1和ICAM-1表达的动态改变。采用RT-PCR及Western blot技术检测黏附分子mRNA及蛋白质水平的表达变化。结果HUVEC在20μg/L VEGF刺激下,ICAM-1和VCAM-1 mRNA水平显著升高,8h达到峰值,与对照组相比分别增加4.2倍及3.2倍。不同浓度上清液孵育的HUVEC在VEGF刺激后,ICAM-1和VCAM-1 mRNA表达均较对照组下降;含70%Ang1-rMSC上清液孵育的HUVEC,VCAM-1与ICAM-1表达较单纯VEGF组显著下降。结论Ang1-rMSC上清液可抑制VEGF诱导的HUVEC黏附分子表达,通过Ang1基因修饰Ang1-rMSC用于抑制干细胞移植伴发的炎症反应具有可行性。     

MCP—1对培养的人肾小球内皮细胞表达ICAM—1的影响

目的研究单核细胞趋化蛋白 - 1(MCP- 1)对培养的人肾小球内皮细胞 (HU GEC)表达细胞间粘附分子 - 1(ICAM- 1)的影响。方法采用细胞 EL ISA法。结果 1培养的 HU GEC表面有少量 ICAM- 1表达 ,在 10 ng/ m L MCP- 1刺激后 ICAM- 1表达量增多 (P<0 .0 5 ) ,6 h即有 ICAM- 1表达增强 ,12 h达高峰 ,不同浓度的 MCP- 1(10、2 0、40 ng/ m L)刺激HU GEC18h后 ,ICAM- 1表达与对照组比较差异显著 (P<0 .0 1) ;2加入抗 MCP- 1抗体后 ,ICAM- 1表达量下降 ,与对照组比较无差异 (P>0 .0 5 )。结论 MCP- 1可刺激 HU GEC表达 ICAM- 1增加。     

犀角地黄汤合银翘散对流感病毒感染的小鼠肺组织及大鼠肺微血管内皮细胞ICAM-1和VCAM-1表达的影响

 目的：研究中医经典合方犀角地黄汤合银翘散(XDY)对流感病毒性肺炎小鼠肺组织及对流感病毒感染的大鼠肺微血管内皮细胞(RPMVECs)中细胞间黏附分子1（ICAM-1）和血管细胞黏附分子1（VCAM-1）表达的影响,探讨其治疗病毒性肺炎的机制。方法：54只雄性BALB/c小鼠随机分为正常组、模型组和XDY组,每组18只,后2组以流感病毒滴鼻感染,XDY组灌胃给予XDY;在感染后的2、4和6 d分别取材,免疫组化法观察肺组织中ICAM-1和VCAM-1表达。从雄性Wistar大鼠中分离并原代培养RPMVECs,设置正常组、病毒组、病毒+XDY含药血清组、肿瘤坏死因子α（TNF-α）组和TNF-α+XDY含药血清组;刺激因素作用24 h后,real-time PCR检测ICAM-1和VCAM-1 mRNA水平,流式细胞术检测ICAM-1和VCAM-1蛋白表达。结果：与正常组比较,模型组肺组织中ICAM-1和VCAM-1表达持续增多(P<0.01),而XDY组的表达均低于模型组 (P<0.01);与正常组比较,流感病毒和TNF-α作用的RPMVECs中 ICAM-1和VCAM-1 mRNA及蛋白表达明显升高(P<0.01),XDY能下调ICAM-1和VCAM-1 mRNA及蛋白表达 (P<0.01)。结论：抑制流感病毒感染导致的RPMVECs黏附分子的表达从而抑制机体的炎症级联反应可能是XDY治疗流感病毒性肺炎的作用机制之一。     

药物对C反应蛋白诱导脑微血管内皮细胞黏附分子表达的作用

目的探讨一些药物对C反应蛋白（CRP）诱导脑微血管内皮细胞黏附分子表达的作用，为缺血性脑损伤机制及防治策略的进一步研究提供理论依据。方法培养脑微血管内皮细胞（bEnd．3），经辛伐他汀、吡格列酮、Heroin和AG490预处理后与CRP共孵育，采用免疫蛋白印迹（Westernblot-ting）检测细胞黏附分子表达。结果CRP能显著诱导bEnd．3细胞表达细胞间黏附分子（ICAM-1）、血管细胞黏附分子（VCAM-1），信号转导子及转录激活子-3（STA33）酪氨酸残基快速磷酸化。辛伐他汀、吡格列酮和AG490均能显著减少ICAM-1、VCAM-1的表达。结论CRP上调黏附分子表达的作用可能与JAK／STAT信号转导通路有关。辛伐他汀、吡格列酮均能抑制CRP诱导的脑内皮细胞ICAM-1、VCAM-1表达，可能是它们对缺血性脑损伤的保护机制之一。     

抗炎药物对溃疡性结肠炎患者肠黏膜组织NF-κB的活化和细胞黏附分子表达的影响

探讨抗炎药物柳氮磺胺吡啶 (SASP)和糖皮质激素对溃疡性结肠炎 (Ulcerative colitis,UC)患者肠黏膜活检组织细胞间黏附分子 (Intercellular adhesion molecule- 1,ICAM- 1)与血管细胞黏附分子 (Vascular cell adhes-ion molecule- 1,VCAM- 1) m RNA和蛋白表达的影响 ,以及黏附分子 m RNA的表达与 NF- κB活化的关系。2 7例来自四川大学华西医院的 U C患者 (符合 1993年太原会议溃疡性结肠炎诊断标准 )被纳入本研究。其中 15例使用过药物 (SASP或 SASP 糖皮质激素 )治疗 ,12例未用过任何与 U C治疗相关的药物 ,9例同期结肠癌患者 (取其癌旁正常组织 )被作为对照。采用逆转录聚合酶链反应 (RT- PCR)检测 ICAM- 1与 VCAM- 1m RNA的表达 ;酶联免疫吸附试验 (EL ISA)测定 ICAM- 1与 VCAM- 1蛋白水平。凝胶电泳迁移率改变分析 (EMSA)检测 NF-κB DNA结合活性。结果显示 :与对照组相比 ,UC患者肠黏膜活检组织 ICAM- 1与 VCAM- 1m RNA和蛋白表达以及 NF-κBDNA结合活性明显升高 (P<0 .0 5 ) ;糖皮质激素和 SASP明显抑制 U C患者 NF-κB DNA结合活性 ,降低 ICAM- 1与 VCAM- 1m RNA和蛋白的表达 (P<0 .0 5 ) ;ICAM- 1和 VCAM- 1基因激活与 NF-κB DNA结合活性呈显著正相关 (ICAM- 1:r=0 .86 5 2 ,P<0 .0 5 ;VCAM-     

牙龈卟啉单胞菌在单核细胞对内皮细胞黏附作用中的影响

目的 观察牙龈卟啉单胞菌(P.gingivalis)W83和ATCC33277株侵入在单核细胞对内皮细胞黏附作用中的影响,及在内皮细胞细胞间黏附分子l(ICAM-1)转录和翻译中的作用. 方法 建立体外P.gingivalis侵入内皮细胞模型,孟加拉玫瑰红活细胞染色法测定P.gingivalis侵入前后单核细胞对内皮细胞黏附的变化;RT-PCR和mRNA比色定量法检测内皮细胞ICAM-1基因表达;West-ern blot检测ICAM-1蛋白水平的变化. 结果 P.gingivalis W83和ATCC33277株侵入可增加单核细胞对内皮细胞的黏附,抗ICAM-1抗体部分抑制P.gingivalis侵入介导的单核细胞对内皮细胞黏附增加;P.gingivalis侵入上调内皮细胞ICAM-l基因和蛋白的表达,W83诱导单核细胞对内皮细胞黏附增强及内皮细胞ICAM-1表达的能力强于ATCC33277. 结论 ICAM-1在P.gingivalis介导的单核细胞对内皮细胞黏附增强过程中起部分作用,P.gingivalis侵入内皮细胞诱导ICAM-1表达可能是其诱发动脉粥样硬化疾病的机制之一.     

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。     

人参皂苷Rb1减轻人脐静脉内皮细胞氧化损伤

目的探讨人参皂苷Rb1(gRb1)对过氧化氢(H_2O_2)致人脐静脉内皮细胞(HUVECs)氧化损伤的影响。方法将HUVECs分为对照组、H_2O_2(20、40、80和160μmol/L)组、gRb1(10、20和40μmol/L)干预组。MTT法测定细胞存活率;annexin V-FITC/PI双染法检测凋亡;黄嘌呤氧化酶法测定SOD1活性;硫代巴比妥比色法计算MDA含量;Western blot测定细胞间黏附分子-1(ICAM-1)和血管细胞黏附分子-1(VCAM-1)蛋白表达。结果与对照组相比,H_2O_2呈浓度依赖性抑制细胞存活率(P0.05),增加细胞凋亡(P0.05),抑制SOD1活性(P0.05),增加MDA含量(P0.05),促进ICAM-1和VCAM-1蛋白表达(P0.05)。gRb1干预能够显著缓解上述指标的变化。结论 gRb1通过抑制细胞凋亡、改善氧化应激水平和抑制ICAM-1及VCAM-1蛋白表达减轻HUVECs氧化损伤。     

IL-35对sCD40L刺激后的人脐静脉血管内皮细胞黏附功能的影响

目的 探讨白细胞介素(IL)-35对可溶性CD40配体(sCD40L)刺激后血管内皮细胞黏附功能的影响。方法 选取2020年1月至12月于滨海县人民医院诊治的30例下肢深静脉血栓急性期患者(DVT组)和30例健康体检者(HC组)。采集外周静脉血，ELISA检测血清IL-35、sCD40L、血管细胞间黏附分子(VCAM-1)、细胞间黏附分子(ICAM-1)、P-选择素和血管性血友病因子(vWF)的水平。体外培养人脐静脉血管内皮细胞(HUVECs),分为对照组、sCD40L组和IL-35组。ELISA检测细胞培养上清液中VCAM-1、ICAM-1、P-选择素和vWF的水平；Western blot检测细胞VCAM-1、ICAM-1、P-选择素和vWF蛋白的表达；免疫荧光法检测血小板和外周血单个核细胞对HUVECs的黏附。结果 DVT组血清中IL-35表达显著低于对照组(P<0.05),sCD40L、VCAM-1、ICAM-1、P-选择素和vWF的表达显著高于对照组(P<0.05)。体外实验表明，IL-35能显著抑制sCD40L刺激后HUVECs VCAM-1、ICAM-1、P-...     

溶血磷脂酰胆碱对内皮细胞表面粘附分子表达的影响

大量的单核细胞募集是动脉粥样损伤形成的早期表现之一,相关的内皮细胞粘附分子在其中具有积极作用。本文研究了溶血磷脂酰胆碱（Ｌｙｓｏｐｈｏｓｐｈａｔｉｄｙｌｃｈｏｌｉｎｅ,Ｌｙｓｏ－ＰＣ）对培养的人脐静脉内皮细胞（ＨＵＶＥＣｓ）膜上细胞间粘附分子－（Ｉｎｔｅｒｃｅｌｌｕｌａｒ ａｄｈｅｓｉｏｎ ｍｏｌｅｃｕｌｅ－１,ＩＣＡＭ－１）、Ｅ选择素（Ｅｎｄｏｔｈｅｌｉａｌ－ｌｅｕｋｏｃｙｔｅ ａｄｈｅｓｉｏｎ     

Shear stress-mediated changes in the expression of leukocyte adhesion receptors on human umbilical vein endothelial cellsin vitro

Extensive monocyte recruitment is an early phenomenon associated with the development of atherosclerotic lesions, suggesting an active role for the involvement of adhesion receptors expressed by endothelial cells. In this study we describe the contribution of hemodynamic shear forces in regulating the expression of a few of the monocyte adhesion receptors, including intercellular adhesion molecule (ICAM-1), vascular cell adhesion molecule (VCAM-1), and E-selectin on endothelial cells. A parallel plate flow chamber and recirculating flow loop device was used to expose human umbilical vein endothelial cells (HUVECs) to different levels of shear (2–25 dyn/cm²). Subsequently the cells were analyzed either for shear induced changes in the mRNA levels of adhesion receptors by Northern blot analyses or for changes in the surface expression of ICAM-1 using flow cytometry. Results from the fluorescence analysis showed a transient increase in the surface expression of ICAM-1, 12 hr after exposure to 25 dyn/cm² shear, returning to basal levels within 24 hr. This was quite different from the time dependent response of ICAM-1 to lipopolysaccharide (LPS), where ICAM-1 expression was maximally induced 18–24 hr poststimulus. ICAM-1 mRNA level appeared slightly elevated after exposure to shear for 1 hr, compared to basal values, but dropped below basal levels within 6 hr. This biphasic response was seen irrespective of the magnitude of applied shear stress. VCAM-1 mRNA expression, in contrast, decreased below the baseline expression within an hour after onset of flow, and appeared to be considerably down-regulated within 6 hr. After exposure to shear for 24 hr no increase in mRNA levels could be detected for either molecule, at any shear magnitude. E-selectin mRNA was less responsive to shear stress, especially at the lower magnitudes of shear. After an hour of exposure to flow E-selectin mRNA level appeared slightly reduced compared with control levels, but it remained at this level even after 6 hr of flow. These results indicate that the expression of adhesion receptors is sensitive to local shear stresses in a manner that is molecule specific in the short term even though prolonged exposure to flow results in similar down-regulation for both ICAM-1 and VCAM-1.     

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     

Fimbria-Dependent Activation of Cell Adhesion Molecule Expression in Porphyromonas gingivalis-Infected Endothelial Cells

Porphyromonas gingivalis is an oral pathogen that has recently been associated with chronic inflammatory diseases such as atherosclerosis. The strength of the epidemiological associations of P. gingivalis with atherosclerosis can be increased by the demonstration that P. gingivalis can initiate and sustain growth in human vascular cells. We previously established that P. gingivalis can invade aortic, heart, and human umbilical vein endothelial cells (HUVEC), that fimbriae are required for invasion of endothelial cells, and that fimbrillin peptides can induce the expression of the chemokines interleukin 8 and monocyte chemotactic protein. In this study, we examined the expression of surface-associated cell adhesion molecules on endothelial cells in response to P. gingivalis infection by fluorescence-activated cell sorting FACS analysis and confocal microscopy. Coculture of HUVEC with P. gingivalis strain 381 or A7436 resulted in the induction in the expression of intercellular adhesion molecule 1 (ICAM-1), vascular cell adhesion molecule 1 (VCAM-1) and P- and E-selectins, which was maximal at 48 h postinfection. In contrast, we did not observe induction of ICAM-1, VCAM-1, or P- or E-selectin expression in HUVEC cultured with the noninvasive P. gingivalis fimA mutant DPG3 or when P. gingivalis was incubated with fimbrillin peptide-specific anti-sera prior to the addition to HUVEC. Furthermore, the addition of a peptide corresponding to the N-terminal domain of fimbrillin to HUVEC resulted in an increase in ICAM-1, VCAM-1, and P- and E-selectins, which was maximal at 48 h and similar to that observed for live P. gingivalis. Treatment of P. gingivalis-infected HUVEC with cytochalsin D, which prevented P. gingivalis invasion, also resulted in the inhibition of ICAM-1, VCAM-1, or P- and E-selectin expression. Taken together, these results indicate that active P. gingivalis invasion of HUVEC mediated via the major fimbriae stimulates surface-associated cell adhesion molecule expression. Stimulation of adhesion molecules involved in the recruitment of leukocytes to sites of inflammation by P. gingivalis may play a role in the pathogenesis of systemic inflammatory diseases associated with this microorganism, including atherosclerosis.     

Progress in computer-generated three-dimensional reconstruction

The expression of PECAM, ICAM-1, VCAM-1, and E-selectin was studied in 64 samples of human coronary arteries taken from 15 explanted hearts obtained within 5 min of transplantation. Normal artery (n=12), predominantly fibrous plaques (n=23), and plaques containing extracellular lipid (n=26) and three segments showing recanalization channels were studied. All endothelial cells strongly and equally expressed PECAM; positive staining was used to check that artefactual denudation of the endothelial surface had not occurred. PECAM was also present in some lipid-filled macrophages. Normal arteries showed no VCAM-1 staining but focal segments of the endothelium were positive for ICAM-1 and E-selectin. ICAM-1 was strongly and constantly expressed by the endothelium over all types of plaques and in macrophages. E-selectin expression was confined to endothelial cells and occurred on the surface in 35 per cent of fibrous and 22 per cent of lipid-containing plaques. VCAM-1 staining of surface endothelium occurred in 39 per cent of fibrous and 20 per cent of lipid-containing plaques. A population of spindle-shaped cells of macrophage type (positive for EMB11 antigen) expressed VCAM-1 in lipid-containing plaques. Adventitial vessels adjacent to plaques showed endothelial expression of ICAM-1 and E-selectin. VCAM-1 staining of adventitial vessel endothelium was associated with local lymphoid aggregation. In conclusion, the expression of cell adhesion molecules is an important element in the inflammatory component of atherosclerosis and contributes to both monocyte and lymphocyte activation and recruitment from advential vessels and the arterial lumen.     

Human papillomavirus-16-E7 oncoprotein enhances the expression of adhesion molecules in cervical endothelial cells but not in human umbilical vein endothelial cells.

OBJECTIVES: E7 is one of the oncoproteins encoded by human papillomavirus-16 (HPV-16), the major etiologic factor responsible for cervical cancer. Human papillomavirus-16-E7 expressed by human uterine cervix carcinoma cells is also released in the extracellular compartment where it induces immune suppression. We investigated whether E7 was also responsible for the enhanced endothelial adhesiveness required in cancer progression. STUDY DESIGN/METHODS: We treated cervical microvascular endothelial cells (CrMVEn) and human umbilical vein endothelial cells (HUVEC) with E7, tumor necrosis factor-alpha (TNF-alpha), and hydrogen peroxide (H2O2) and measured the expression of E-selectin, intercellular adhesion molecule-1 (ICAM-1), and vascular cell adhesion molecule-1 (VCAM-1) by fluorescent-activated cell sorter analysis. RESULTS: E7 strongly induced the expression of E-selectin, ICAM-1, and VCAM-1 in CrMVEn, but not in HUVEC. Tumor necrosis factor-alpha further increased the endothelial expression of adhesion molecules in CrMVEn. Hydrogen peroxide pre-treatment resulted in an enhanced ICAM-1 and a decreased E-selectin and VCAM-1 expression. We also show indirect effects when endothelial cells were stimulated with the supernatant of E7-pretreated macrophages. CONCLUSIONS: These results show that HPV-16-E7 oncoprotein strongly induces adhesion molecules expression in organ-specific endothelial cells.     

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     

IL-6 acts on endothelial cells to preferentially increase their adherence for lymphocytes

Using a quantitative monolayer adhesion assay, the current report shows that treatment of human umbilical vein endothelial cells (HUVEC) with IL-6 increases their adhesiveness for blood lymphocytes, particularly CD4⁺ cells, but not for polymorphonuclear cells and monocytes. This effect, which was most pronounced when using low concentrations of the cytokine (0.1–1.0 U/ml) and a short incubation period (4 h), was also apparent with microvascular endothelial cells and a hybrid endothelial cell line. Skin lesions from patients with mycosis fungoides contain high levels of IL-6, and blood lymphocytes from patients with this disorder also exhibited an enhanced adhesion to IL-6-treated HUVEC. The cytokine enhanced intercellular adhesion molecule-1 (ICAM-1) expression and induced the expression of vascular cell adhesion molecule-1 (VCAM-1) and E-selectin on endothelial cells. Antibody blocking studies demonstrated that the vascular adhesion molecules ICAM-1, VCAM-1 and E-selectin and the leucocyte integrin LFA-1 all contributed to lymphocyte binding to endothelium activated by IL-6. It is proposed that IL-6 may be involved in the recruitment of lymphocytes into non-lymphoid tissue.     

Cyclic-strain-induced endothelial cell expression of adhesion molecules and their roles in monocyte-endothelial interaction.

Vascular endothelial cells (ECs) are constantly subjected to hemodynamic forces that may regulate monocyte-endothelial interaction in vivo. To examine the effects of cyclic strain on endothelial expression of monocyte adhesion molecules, E-selectin, intercellular adhesion molecule-1 (ICAM-1), and vascular cell adhesion molecule-1 (VCAM-1) ECs were exposed to physiologically relevant levels of cyclic strain. When ECs were under 25% maximal strain at 30 cycles/min for 24 h, the expression of E-selectin significantly (p<0.05) increased, by 83%, compared to control ECs under static conditions. Similarly, monocyte adhesion to ECs under strain (maximum of 15 or 25% at 30 and 60 cycles/min for 24 h) also significantly (p<0.05) increased, by >82%. This cyclic-strain-induced monocyte adhesion was substantially inhibited (83.5%) by anti-E-selectin antibody. ICAM-1 expression also significantly increased, by 62%, when ECs were under 25% maximal strain at 30 cycles/min for 3 h whereas VCAM-1 expression by ECs under strain (for 0.5, 3, and 24 h) did not change compared to static ECs. When ECs were treated with anti-ICAM-1 antibody and monocytes with anti-VLA-4 antibody, an increase in monocyte adhesion to ECs under cyclic strain was reduced significantly. These results demonstrate that cyclic strain can induce EC expression of monocyte adhesion molecules E-selectin, ICAM-1, and VCAM-1 in a time-dependent manner and thus can mediate monocyte adhesion.     

The immunosuppressive drug mycophenolate mofetil impairs the adhesion capacity of gastrointestinal tumour cells

Immunosuppression correlates with the development and recurrence of cancer. Mycophenolate mofetil (MMF) has been shown to reduce adhesion molecule expression and leucocyte recruitment into the donor organ. We have hypothesized that MMF might also prevent receptor-dependent tumour dissemination. Therefore, we have investigated the effects of MMF on tumour cell adhesion to human umbilical vein endothelial cells (HUVEC) and compared them with the effects on T cell-endothelial cell interactions. Influence of MMF on cellular adhesion to HUVEC was analysed using isolated CD4+ and CD8+ T cells, or WiDr colon adenocarcinoma cells as the model tumour. HUVEC receptors ICAM-1, VCAM-1, E-selectin and P-selectin were detected by flow cytometry, Western blot or Northern blot analysis. Binding activity of T cells or WiDr cells in the presence of MMF were measured using immobilized receptor globulin chimeras. MMF potently blocked both T cell and WiDr cell binding to endothelium by 80%. Surface expression of the endothelial cell receptors was reduced by MMF in a dose-dependent manner. E-selectin mRNA was concurrently reduced with a maximum effect at 1 microm. Interestingly, MMF acted differently on T cells and WiDr cells. Maximum efficacy of MMF was reached at 10 and 1 microm, respectively. Furthermore, MMF specifically suppressed T cell attachment to ICAM-1, VCAM-1 and P-selectin. In contrast, MMF prevented WiDr cell attachment to E-selectin. In conclusion, our data reveal distinct effects of MMF on both T cell adhesion and tumour cell adhesion to endothelial cells. This suggests that MMF not only interferes with the invasion of alloactivated T cells, but might also be of value in managing post-transplantation malignancy.