血管内皮生长因子、细胞间黏附分子1在糖尿病大鼠肾小球的表达

目的 探讨血管内皮生长因子(VEGF)和细胞间黏附分子1(1CAM-1)在糖尿病肾病(DN)发生机理中的作用。方法 采用链脲佐菌素(STZ)诱发糖尿病(DM)大鼠模型，观察大鼠肾小球肥大、肾功能和24h尿蛋白改变以及用免疫组织化学和计算机图像分析技术定位、半定量检测VEGF和ICAM—1在DM大鼠肾小球的表达。结果 VEGF和ICAM—1在糖尿病大鼠肾小球中均有不同程度表达，VEGF主要分布于肾小球脏层上皮细胞的脑浆之中，ICAM—1主要分布于肾小球内皮细胞和系膜细胞的脑浆中。VEGF、ICAM-1水平与蛋白尿和肾小球肥大呈正相关关系。结论 DM大鼠肾小球VEGF和ICAM-1的升高可能参与了DN的疾病发展过程，估计是糖尿病肾病发生机理之一。     

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。     

香烟烟雾提取物通过活化NF-κB上调小鼠巨噬细胞ICAM-1表达

目的:探讨核因子-κB(NF-κB)对香烟诱导的小鼠巨噬细胞细胞间粘附分子-1(ICAM-1)表达的调控机制,以及地塞米松的抑制作用。方法:分别用香烟烟雾提取物(CSE)、CSE 二硫基氨基甲酸吡咯烷(PDTC)、CSE 地塞米松(DEX)与小鼠巨噬细胞共同孵育1、4和12h,采用免疫细胞化学染色和逆转录聚合酶链式反应(RT-PCR)法检测巨噬细胞NF-κB和ICAM-1的表达。结果:(1)CSE组巨噬细胞NF-κB核染色阳性细胞百分比(41.50%±1.30%)明显高于对照组(10.40%±1.57%),P<0.01;CSE PDTC组和CSE DEX组阳性细胞百分比(17.89%±2.62%,12.72%±1.10%)明显低于CSE组,均P<0.01;(2)CSE组巨噬细胞ICAM-1mRNA水平(1.34±0.05)及其蛋白表达阳性细胞百分比(43.02%±2.37%)明显高于对照组(0.49±0.03,10.58%±0.88%),均P<0.01;CSE PDTC组和CSE DEX组巨噬细胞ICAM-1mRNA水平(0.98±0.05,1.07±0.04)及其蛋白表达阳性细胞百分比(18.42%±1.06%,27.76%±2.06%)明显低于CSE组,均P<0.01;(3)巨噬细胞NF-κB核染色阳性细胞百分比与ICAM-1mRNA水平及其蛋白表达阳性细胞百分比均呈显著正相关(分别为r=0.789和r=0.833,均P<0.01)。结论:香烟可通过诱导巨噬细胞NF-κB的活化在转录水平上上调ICAM-1的表达,地塞米松可抑制香烟诱导的NF-κB活化和ICAM-1的表达。     

The role of endothelial cell adhesion molecules P-selectin, E-selectin and intercellular adhesion molecule-1 in leucocyte recruitment induced by exogenous methylglyoxal

Methylglyoxal (MG) is a reactive dicarbonyl metabolite formed during glucose, protein and fatty acid metabolism. In hyperglycaemic conditions, increased MG level has been linked to the development of diabetes and its vascular complications at the macrovascular and microvascular levels where inflammation plays a role. To study the mechanism of MG‐induced inflammation in vivo, we applied MG locally to healthy mice and used intravital microscopy to investigate the role of endothelial cell adhesion molecules in MG‐induced leucocyte recruitment in cremasteric microvasculature. Administration of MG (25 and 50 mg/kg) to the tissue dose‐dependently induced leucocyte recruitment at 4·0–5·5 hr, with 84–92% recruited cells being neutrophils. Such MG treatment up‐regulated the expression of endothelial cell adhesion molecules P‐selectin, E‐selectin, intercellular adhesion molecule‐1, but not vascular cell adhesion molecule‐1. Activation of the nuclear factor‐κB signalling pathway contributed to MG‐induced up‐regulation of these adhesion molecules and leucocyte recruitment. The role of the up‐regulated endothelial cell adhesion molecules in MG‐induced leucocyte recruitment was determined by applying specific functional blocking antibodies to MG‐treated animals and observing changes in leucocyte recruitment parameters. Our data demonstrate that the up‐regulation of P‐selectin, E‐selectin and intercellular adhesion molecule‐1 contributes to the increased leucocyte rolling flux, reduced leucocyte rolling velocity, and increased leucocyte adhesion, respectively. Our results reveal the role of endothelial cell adhesion molecules in MG‐induced leucocyte recruitment in microvasculature, an inflammatory condition related to diabetic vascular complications.     

细胞间黏附分子-1与血管生成的研究进展

实体肿瘤的生长、浸润和转移均依赖于血管生成这一进程,而血管生成是在一系列生长因子调控下实现的。有资料显示,细胞间黏附分子-1与血管生成有关,它通过与内皮细胞表面上的特异性受体结合而发挥其生物学活性,在某些疾病过程中的血管生成及发生发展过程中起着重要作用。现就细胞间黏附分子-1的生物学特性及与血管生成的关系研究进展概述如下。     

Interleukin-10 inhibits B7 and intercellular adhesion molecule-1 expression on human monocytes

There is evidence that interleukin ?10(IL-10) interferes with the costimulatory properties of antigen-presenting cells and, thereby, inhibits their ability to induce T cell activation. To determine whether this effect might involve modulation of the expression of accessory molecules, we analyzed by flow cytometry the influence of human IL-10 on the basal expression of intercellular adhesion molecule 1 (ICAM-1) as well as on the interferon γ(IFN-γ)-induced up-regulation of ICAM-1 and B7 at the surface of human monocytes. IL-10 inhibited both the basal expression and the IFN-γ-induced ICAM-1 up-regulation. IL-10 also reduced B7 up-regulation on IFN-γ-stimulated monocytes. The inhibitory effect of IL-10 both on ICAM-1 and B7 expression was shown to be dose dependent. We conclude that the ability of IL-10 to decrease both ICAM-1 and B7 expression on monocytes might contribute to its immunosuppressive properties.     

Peroxisome proliferator-activated receptor-gamma agonists inhibit respiratory syncytial virus-induced expression of intercellular adhesion molecule-1 in human lung epithelial cells

Respiratory syncytial virus (RSV) is the major causative agent of severe lower respiratory tract disease and death in infants worldwide. The epithelial cells of the airways are the target cells for RSV infection and the site of the majority of the inflammation associated with the disease. However, despite five decades of intensive RSV research there exist neither an effective active vaccine nor a promising antiviral and anti-inflammatory therapy. Recently, peroxisome proliferator-activated receptor-gamma (PPAR-gamma), a member of the nuclear hormone receptor superfamily, has been shown to possess anti-inflammatory properties. Therefore, we hypothesized whether the detrimental increase of intercellular adhesion molecule-1 (ICAM-1) on RSV-infected lung epithelial cells (A549 and primary normal human bronchial epithelial cells (NHBE)) might be modulated by natural and synthetic PPAR-gamma agonists (15d-PGJ2, ciglitazone, troglitazone, Fmoc-Leu). Our data show that all PPAR-gamma agonists under study significantly down-regulated the RSV-induced expression of ICAM-1 on A549- and NHBE cells in a dose-dependent manner resulting in a reduced beta2 integrin-mediated adhesion of monocytic effector cells (U937) to RSV-infected A549 cell monolayers. In contrast, the PPAR-alpha agonist bezafibrate had no impact on the RSV-induced ICAM-1 expression. The reduced ICAM-1 expression was associated with a diminished ICAM-1 mRNA level and binding activity of nuclear factor-kappaB (p65/p50) in A549 cells. These findings suggest that PPARgamma agonists have beneficial effects in the suppression of the inflammatory response during RSV infection and therefore might have clinical efficacy in the course of severe RSV-infection.     

Increased adhesion to vascular cell adhesion molecule-1 and intercellular adhesion molecule-1 of eosinophils from patients with asthma

Adhesion of peripheral blood eosinophil and neutrophil granulocytes to the endothelial cell adherence receptors E-selectin, vascular cell adhesion molecule-1, and intercellular adhesion molecule-1 has been measured. The study included patients with allergic rhinitis, patients with mild allergic and nonallergic asthma, and healthy individuals; 10 persons were in each group. In addition, assay of eosinophil and neutrophil cell surface expression of the receptor complex CD11b/CD18 was performed. Increased eosinophil adhesion to vascular cell adhesion molecule-1 (p < 0.05) and intercellular adhesion molecule-1 (p < 0.05) was demonstrated in the patients with a more labile asthma, that is, a peak expiratory flow rate variability of more than 10%, suggesting a relationship to the degree of ongoing inflammation in the airways of the patients. The increased eosinophil adhesion was most probably due to a functional upregulation of the CD11b/CD18 and very late activation antigen-4 receptors, because the number of receptors measured as cell surface expression was unaltered. The increased eosinophil adhesion in the patients with high peak expiratory flow rate variability appeared independent of atopy. The increased adhesion was not entirely specific to the eosinophils, because neutrophils from patients with a peak expiratory flow rate variability of more than 10% also demonstrated increased adhesion to intercellular adhesion molecule-1 (p < 0.05) when compared with neutrophils from the patients with low peak expiratory flow rate variability. In conclusion, the demonstrated priming of eosinophil adhesion to vascular cell adhesion molecule-1 and intercellular adhesion molecule-1 might be one contributing mechanism behind the selective accumulation of eosinophils in the lung tissue of patients with asthma. (J ALLERGY CLIN IMMUNOL 1995;96:941-50.)     

灯盏花素对大鼠脑缺血后细胞间粘附分子-1及其mRNA表达的影响

目的:灯盏花素对大鼠脑缺血后细胞间粘附分子-1(ICAM-1)及其mRNA表达的影响。方法:复制大鼠大脑中动脉闭塞/再灌注模型,应用RT-PCR及免疫组织化学的方法,观察各组大鼠脑缺血后细胞间粘附分子-1 mRNA及其蛋白的表达。结果:ICAM-1在假手术组大鼠脑组织呈低表达;单纯缺血组(缺血90 min)ICAM-1表达上调(P＜0.05);缺血再灌注组(缺血90 min再灌24 h)脑组织ICAM-1表达显著高于假手术组和单纯缺血组(P＜0.01);灯盏花素治疗组于相同时限ICAM-1表达与单纯缺血、缺血再灌注组相比显著下调(P＜0.01)。大鼠脑组织ICAM-1 mRNA在假手术组呈低表达;单纯缺血组ICAM-1 mRNA水平显著上调(P＜0.01);药物治疗组于相同时限ICAM-1 mRNA水平显著低于单纯缺血组及缺血再灌注组(P＜0.01)。结论:灯盏花素下调细胞间粘附分子-1mRNA及其蛋白的表达,减轻缺血后再灌注损伤,从而发挥脑保护作用。     

Expression of interferon-gamma receptors and interferon-gamma-induced up-regulation of intercellular adhesion molecule-1 in basal cell carcinoma; decreased expression of IFN-γR and shedding of ICAM-1 as a means to escape immune surveillance

The peritumoural inflammatory infiltrate in basal cell carcinoma (BCC) of the skin consists mainly of T lymphocytes which hardly invade the tumour nests. The absence of intercellular adhesion molecule-1 (ICAM-1) on BCC cells may explain the lack of tumour-infiltrating cells and the lack of an active cell-mediated immune response in this tumour. In this study, the induction of ICAM-1 was investigated in BCC biopsies using recombinant human interferon-gamma (rHuIFN-γ). The expression of interferon-gamma receptors (IFN-γR) in the biopsies was also investigated. The results showed that BCC cells expressed ICAM-1 after incubation with rHuIFN-γ, but to a lesser degree than normal epidermal cells. The levels of shed ICAM-1 were significantly increased in the culture supernatants of tumour biopsies compared with those from normal skin biopsies, after culturing in the presence of rHuIFN-γ. The expression of IFN-γR was significantly decreased on the tumour cells compared with the overlying epidermis. The decreased expression of IFN-γR on the tumour cells and the shedding of ICAM-1 into the peritumoural stroma may be a plausible mechanism by which the tumour cells are protected against an active cell-mediated immune response. © 1998 John Wiley & Sons, Ltd.     

The role of amniotic fluid interleukin-6, and cell adhesion molecules, intercellular adhesion molecule-1 and leukocyte adhesion molecule-1, in intra-amniotic infection

PROBLEM: To determine amniotic fluid concentrations and correlations of interleukin-6 (IL-6), intercellular adhesion molecule-1 (ICAM-1), and leukocyte adhesion molecule-1 (LAM-1) in patients with and without intra-amniotic infection. METHOD OF STUDY: Fourteen specimens with intra-amniotic infection and 45 without intra-amniotic infection were studied. Intra-amniotic infection was defined as the presence of a positive amniotic fluid culture. Amniotic fluid IL-6, ICAM-1, and LAM-1 levels were determined by an enzyme-linked immunoassay, and normalized by amniotic fluid creatinine levels. RESULTS: Amniotic fluid concentrations of IL-6 and LAM-1 were significantly higher in patients with than without intra-amniotic infection. However, amniotic fluid ICAM-1 concentrations were not significantly different between two groups. Amniotic fluid IL-6, LAM-1, and ICAM-1 were positively correlated. CONCLUSIONS: Our data indicate that amniotic fluid IL-6 is significantly associated with an increased adhesion molecule expression in intra-amniotic infection. However, LAM-1 plays a more important role than ICAM-1 in intra-amniotic infection.     

Immunohistochemical analysis of intercellular adhesion molecule-1 expression in human gastric adenoma and adenocarcinoma

In this study, we examined the distribution of intercellular adhesion molecule-1 (ICAM-1) in gastric adenomas and carcinomas immunohistochemically at the light and electron microscopic levels. ICAM-1 was expressed on tumour cells in 12 of 28 gastric carcinomas and in 3 of 11 adenomas but not on most normal gastric epithelial cells. ICAM-1 was localized on luminal sites of neoplastic glands in adenomas and in intestinal-type carcinomas, and rarely on the surface of tumour cells of diffuse carcinomas. Expression of ICAM-1 on the tumour cells was more frequent in intestinal-type than diffuse carcinomas (P<0.005). At the ultrastructural level, ICAM-1 was present prominently on the apical membrane and weakly on the lateral surface of the tumour cells of the intestinal-type carcinoma and also localized on the perinuclear membrane and the membrane of the endoplasmic reticulum of cancer cells. There was no significant association between. ICAM-1 expression and HLA antigen expression or the number of infiltrating lymphocyte subsets. These results may implicate the synthesis of ICAM-1 by gastric cancer cells, but the expression is infrequent and may not be sufficient for host immune surveillance of the tumour cell.     

Expression of adhesion molecules on cord-blood-derived, cultured human mast cells and effect of dexamethasone on intercellular adhesion molecule-1 expression on the mast cells treated by phorbol myristate acetate

BACKGROUND: Increase in mast-cell number at sites of allergic inflammation has been observed, and glucocorticoids applied to the sites have been shown to result in a significant reduction in mast cells. However, the expression of adhesion molecules on cultured human mast cells and their regulation by glucocorticoids is poorly understood. METHODS: Cultured human mast cells were raised from human umbilical cord-blood cells, and the expression of adhesion molecules on the mast cells was analyzed by flow cytometry. The cells were also incubated with 10 ng/ml phorbol myristate acetate (PMA) for the indicated time, and the effect of dexamethasone on adhesion molecule expression on PMA-treated, cultured human mast cells was examined. RESULTS: Cord-blood-derived, cultured human mast cells constitutively expressed intercellular adhesion molecule-1 (ICAM-1), very late antigen-4 (VLA-4), and macrophage-1 antigen (Mac-1). Weak expression of lymphocyte function-associated antigen-1 (LFA-1) was observed on the cells, whereas they failed to express vascular cell adhesion molecule-1 (VCAM-1). Kinetic studies showed that after a transient downregulation reaching a minimum at 8 h, the expression of ICAM-1 was markedly upregulated on PMA-treated mast cells after a 24-h incubation. In contrast, the expression of VLA-4 and Mac-1 was decreased after the incubation with PMA for 24 h. The PMA-induced upregulation of ICAM-1 was inhibited by dexamethasone in a concentration-dependent manner. CONCLUSION: Our results indicate that cord-blood-derived, cultured human mast cells constitutively express integrins and ICAM-1, but not VCAM-1, and demonstrate for the first time that dexamethasone inhibits the upregulation of ICAM-1 on PMA-treated, cultured human mast cells.     

Inhibition of intercellular adhesion molecule-1 (ICAM-1), soluble ICAM-1 and interleukin-4 by nitric oxide expression in migraine patients

 The mechanisms of the postulated ”sterile” inflammation in migraine were studied utilizing flow cytometry (intercellular adhesion molecule 1, ICAM-1; interleukin-1 receptor, IL-1R) and enzyme-linked immunosorbent assay (soluble intercellular adhesion molecule 1, sICAM-1; interleukin-4, IL-4). Twenty patients suffering from migraine without aura, 20 healthy subjects, and 10 patients suffering from episodic tension headache were selected. All of the migraine patients were studied during a migraine crisis experimentally induced by the administration of isosorbide dinitrate (a nitric oxide donor), and 10 out the 20 were also studied during a spontaneous migraine attack. A sharp decrease in the expression of ICAM-1 (F=5.09, p<0.001 and F=2.46, p<0.05, respectively), sICAM-1 1 (F=6.21, p<0.0001 and F=3.99, p<0.007, respectively) and serum IL-4 (F=6.23, p<0.001 and F=3.64, p<0.01, respectively) were observed in experimentally induced and spontaneous migraine attacks. There was no change with respect to IL-IR 1 receptor expression values. The two control groups, tested with the same experimental procedure, showed no changes in ICAM-1 and IL-1R or in in sICAM-1 and IL-4. Our data suggest that migraine patients are more sensitive to exogenous NO than controls. In addition, our results indicate that experimental migraine crisis, induced by an NO donor, is mediated by the inhibition of IL-4 and subsequently of ICAM-1. It is likely that the described ICAM-1 downregulation inhibits during a migraine attack the critical step of transendothelial migration into the cerebral tissues of activated leukocytes, as proposed in the ”sterile inflammation” hypothesis. Received: 17 April 1996 / Accepted: 30 December 1996     

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.     

巨噬细胞浸润及细胞间粘附分子-1表达在油酸致大鼠急性肺损伤发病中的作用

目的:探讨巨噬细胞浸润及细胞间粘附分子-1(ICAM-1)表达在油酸诱导的大鼠急性肺损伤(ALI)中的作用。方法:雄性Wistar大鼠静脉注射油酸复制ALI为油酸组,静脉注射生理盐水为对照组。静注后4h,测定血气(左心PaO₂)、肺泡通透指数等肺损伤指标。支气管肺泡灌洗液(BALF)中巨噬细胞比和可溶性细胞间粘附分子-1(sICAM-1)水平。用原位杂交检测ICAM-1mRNA表达水平和免疫组化双重套染方法检测巨噬细胞浸润程度与ICAM-1表达的关系。结果:油酸组PaO₂低于对照组、肺泡通透性指数高于对照组(P＜0.01),BALF中巨噬细胞比例,sICAM-1水平显著高于对照组(P＜0.01)。油酸组肺组织ICAM-1表达明显高于对照组,且肺组织中巨噬细胞浸润数、ICAM-1表达水平和肺损伤指标呈显著正相关。结论:巨噬细胞浸润在油酸致急性肺损伤中起重要作用,ICAM-1参与介导了巨噬细胞对组织的粘附、浸润和ALI的发生发展。