Interferon-gamma (IFN-γ) down-regulates the rhinovirus-induced expression of intercellular adhesion molecule-1 (ICAM-1) on human airway epithelial cells

Human rhinoviruses (HRV) are a major cause of upper respiratory tract infections in man, and can exacerbate existing pulmonary disease. The major group of HRV attach to ICAM-1, which is expressed on nasal and bronchial epithelial cells. To study the influence of biological mediators on ICAM-1 expression, and consequently HRV attachment and infection, we compared the effects of various cytokines, alone and in combination, on ICAM-1 expression by an uninfected and HRV-infected bronchial epithelial cell line H292. Cytokines known to be released soon after viral infection, such as tumour necrosis factor-alpha (TNF-α), IL-1β and the chemokine IL-8 increase ICAM-1 expression on uninfected cells. Epithelial cells infected with live HRV-14 displayed marked up-regulation of ICAM-1 compared with baseline. TNF-α further enhanced the HRV-induced increase in ICAM-1 expression on epithelial cells, peaking at day 4 after infection, whilst IL-8 exhibited a steady increase in ICAM-1 expression over 14 days. In contrast, IFN-γ, a known Th1 antiviral lymphokine, whilst increasing the level of ICAM-1 on uninfected cells, induced a significant persistent down-regulation of ICAM-1 expression on HRV-infected epithelial cells. With combinations of TNF-α and IFN-γ, ICAM-1 expression on HRV-infected cells was reduced to basal levels. The effects of IFN-γ were paralleled by a reduction in viral titres. Our in vitro model has provided useful insights into the early pathogenic events of HRV infection at the level of the host cell–v irus interaction. Our data confirm that biological mediators play a crucial role in the pathogenesis as well as the course of HRV infection which is modulated by the types, and time kinetics of inflammatory cytokines in the immediate microenvironment.     

肺炎衣原体对血管内皮细胞的感染及其对ICAM-1表达的影响

目的:观察肺炎衣原体对人脐静脉内皮细胞(HUVECs)的感染及其对细胞分泌和表达细胞间粘附分子1(ICAM-1)的影响,探讨C.pneumoniae感染在动脉粥样硬化形成中的作用及其可能机制。方法:用人喉表皮癌(HEP-2)细胞培养C.pneumoniae,以C.pneumoniae感染HUVE细胞,经透射电镜及PCR检测有无感染。用流式细胞仪检测感染前后HUVE细胞表面ICAM-1蛋白的表达的变化,用荧光定量RT-PCR检测ICAM-1mRNA的变化。结果:C.pneumoniae能感染体外培养的HUVE细胞;感染后12h,细胞表面ICAM-1蛋白的表达即增加,其峰值约在感染后24h;荧光定量RT-PCR结果显示其增加在mRNA水平。结论:C.pneumoniae能感染体外培养的人脐静脉内皮细胞并增加ICAM-1的表达,提示C.pneumoniae感染可能是动脉粥样硬化的始动因子之一,其致动脉粥样硬化机制可能与感染后血管内皮细胞粘附分子表达的增加有关。     

NF-κB及ICAM-1在脑出血大鼠及过氧化氢损伤大鼠脑微血管内皮细胞中的表达

目的： 探讨脑出血后炎症反应机制及核因子-κB(NF-κB)与细胞间粘附分子-1(ICAM-1)间表达的关系。方法： 建立大鼠脑出血模型及过氧化氢损伤大鼠脑微血管内皮细胞的模型，分别采用免疫组化、原位杂交、免疫细胞化学及Western blotting方法观察NF-κB和ICAM-1的表达。结果： 大鼠脑出血后NF-κB 及ICAM-1表达均增强，ICAM-1的表达高峰（1 d）先于NF-κB（4 d），但在体外实验中，过氧化氢损伤后即刻大鼠脑微血管内皮细胞中NF-κB表达即增加，2 h后ICAM-1表达也上调，NF-κB的抑制剂吡咯烷二硫氨基甲酸（PDTC)可下调NF-κB及ICAM-1表达。结论: 在活性氧损伤中NF-κB作为ICAM-1的活化因子，可上调ICAM-1表达，但在脑出血这一复杂的病理生理变化中，尚有其它因素参与对NF-κB 及ICAM-1表达的调控。     

MEK1/2在脂多糖诱导人脐静脉内皮细胞ICAM-1表达中的作用

目的：探讨MEK1/2在脂多糖诱导人脐静脉内皮细胞（HUVECs）ICAM-1表达中的作用。 方法： 用不同浓度LPS或LPS加MEK1/2特异性抑制剂PD98059和HUVECs孵育不同时间后，分别采用RT-PCR和Western blotting检测ICAM-1 mRNA和蛋白的表达。 结果： LPS呈时间-浓度依赖性地上调HUVECs ICAM-1 mRNA和蛋白的表达。LPS预处理后2 h，HUVECs ICAM-1 mRNA和蛋白的表达即开始升高，LPS(100 μg·L-1)作用后6 h,ICAM-1 mRNA和蛋白的表达基本达到高峰；PD98059(10 μg·L-1)可显著抑制LPS(100 μg·L-1)诱导6 h的ICAM-1 mRNA和蛋白的表达，抑制率分别为54.4%和44.9%（P<0.01 vs LPS）。 结论： 调控MEK1/2通路可能为内毒素休克诱导血管内皮损伤的防治提供新的策略。     

氟伐他汀单用及与安体舒通联用对兔相关炎症因子及基质金属蛋白酶-9的影响

目的探讨他汀类药物单用及联用醛固酮拮抗剂安体舒通对兔颈动脉组织ICAM-1、VCAM-1及MMP-9表达的影响。方法高脂饲养兔建立动物模型。96只新西兰兔分为对照组、高脂饮食组、氟伐他汀处理组（氟伐他汀组）以及氟伐他汀与安体舒通联合处理组（联合处理组）,每组24只。用免疫组织化学法检测ICAM-1、VCAM-1、MMP-9表达量。结果氟伐他汀组和联合处理组ICAM-1、VCAM-1及MMP-9的表达随时间的增加而逐渐降低（P〈0.05）,且在治疗8周和12周时降低较为显著（P〈0.05）。结论随着高脂饲养时间的延长,动脉组织中ICAM-1、VCAM-1及MMP-9表达量增加;他汀类药物可降低ICAM-1、VCAM-1及MMP-9表达量,延缓动脉粥样硬化形成及易损组织产生,联合醛固酮拮抗剂时此作用增强。     

旁路活化补体协同TNF-α对血管内皮细胞ICAM-1表达和粘附作用的影响

目的 :探讨旁路活化补体协同TNF -α对血管内皮细胞ICAM - 1表达及中性粒细胞 -内皮细胞(PMN -EC)粘附的影响。方法 :采用酵母多糖活化人血清 (ZAHS)单独、和TNF -α协同作用于体外培养的内皮细胞单层 ,用直接细胞计数和改良细胞ELISA方法检测中性粒细胞 -内皮细胞粘附率的变化和细胞间粘附分子 (ICAM -1)的表达。结果 :旁路活化补体单独作用于内皮细胞对PMN -EC粘附和ICAM - 1的表达仅有轻微影响 ;和 4 0 μg/L的TNF -α共同作用可以明显促进PMN -EC粘附率和ICAM - 1的表达。结论 :旁路活化补体对TNF -α诱导的PMN-EC粘附及ICAM - 1的表达具有促进作用 ,从而引起炎症反应     

Intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) expression and function on cultured human glomerular epithelial cells.

Glomerular epithelial cells are involved in extracapillary inflammation (crescents) but the mechanisms of this extracapillary accumulation of macrophages, epithelial cells and occasional lymphocytes are unknown. Human glomerular parietal epithelial cells express ICAM-1 and VCAM-1 on immunohistological stains of renal biopsies. We studied the expression of these cell adhesion molecules on cultured human glomerular epithelial cells (HGEC), their regulation by pro-inflammatory cytokines, and their role in mediating the adhesion of concanavalin A (Con A)-activated peripheral blood mononuclear cells. Human glomerular epithelial cells in culture constitutively express ICAM-1 and VCAM-1. The expression of ICAM-1 was not significantly altered by tumour necrosis factor-alpha (TNF-alpha) (P = 0.32), IL-1 beta (P = 0.24), interferon-gamma (IFN-gamma) (P = 0.66) or IL-4 (P = 0.85). VCAM-1 expression was increased by all four cytokines, but only significantly so by IL-4 (P = 0.0001). Con A-stimulated, monocyte-depleted peripheral blood lymphocytes bound to human glomerular epithelial cells, median 28.9% (range 14.5-37.9%). This adherence was significantly inhibited by anti-ICAM-1 (P = 0.03) and anti-LFA-1 (P = 0.02), but not by anti-VCAM-1 (P = 0.13) or by antibody to von Willebrand factor (P = NS). The interaction between ICAM-1 on HGEC and LFA-1 on mononuclear cells may be important in the pathogenesis of extracapillary inflammation in glomerulonephritis.     

红花黄素对大鼠肺动脉内皮细胞P-选择素及ICAM-1表达的影响

目的观察红花黄素在缺氧复氧条件下对大鼠肺动脉内皮细胞P-选择素(Ps)及细胞间黏附分子-1(ICAM-1)基因表达的影响。方法采用细胞培养、RT-PCR、W estern b lot、免疫细胞化学染色法等技术,观察在常氧、缺氧、复氧及红花黄素干预等不同条件下大鼠肺动脉内皮细胞Ps、ICAM-1 mRNA及蛋白表达的变化。结果常氧组细胞1、6、12 h各个时间点,Ps、ICAM-1 mRNA及蛋白表达水平没有明显变化,缺氧组的各个时间点Ps、ICAM-1表达水平与同时间点常氧组相比无统计学差异(P分别>0.05)。缺氧1 h后再给氧1、6、12 h,Ps、ICAM-1 mRNA及蛋白的表达均明显高于相同时间点常氧组与缺氧组(P分别<0.05);缺氧1 h后再给氧同时给予红花黄素干预组Ps、ICAM-1 mRNA及蛋白的表达均明显低于相同时间点单纯缺氧复氧组(P分别<0.05)。结论单纯缺氧状态下大鼠肺动脉血管内皮细胞Ps、ICAM-1表达无明显变化,缺氧复氧条件下Ps、ICAM-1表达上调,红花黄素可抑制缺氧复氧条件下Ps、ICAM-1的过度表达。     

血管紧张素-(1-7)对血管紧张素Ⅱ诱导的脐静脉内皮细胞MCP-1和ICAM-1表达的影响

目的： 研究血管紧张素-(1-7)［Ang-(1-7)］对血管紧张素Ⅱ（AngⅡ）诱导的脐静脉内皮细胞（HUVEC）单核细胞趋化蛋白-1（MCP-1）和细胞间黏附分子-1（ICAM-1）的影响,阐明Ang-(1-7)对AngⅡ在炎症方面的拮抗作用。方法: 体外培养HUVEC,随机分为：对照组;AngⅡ组;Ang-(1-7)组;AngⅡ+Ang-(1-7)组;AngⅡ+ Ang-(1-7) + Ang-(1-7)受体阻断剂A-779组。以ELISA法和半定量RT-PCR法从蛋白和mRNA水平检测MCP-1和ICAM-1的表达情况。结果: 与对照组比,AngⅡ（100 nmol/L）使MCP-1和ICAM-1的蛋白和mRNA表达明显增加（P<0.05）;Ang-(1-7)（1 000 nmol/L）使MCP-1和ICAM-1的蛋白和mRNA表达降低（P<0.05）;混合刺激组中,与AngⅡ组比较,Ang-(1-7) （10 nmol/L、100 nmol/L、1 000 nmol/L、10 000 nmol/L）呈剂量依赖性地抑制AngⅡ诱导的HUVEC MCP-1、ICAM-1蛋白和mRNA的表达（P<0.05）,Ang-(1-7) 浓度为1 000 nmol/L时,虽然蛋白和mRNA表达仍高于对照组,但无显著差异（P>0.05）;加入 A-779 组与AngⅡ组比较无显著差异（P>0.05）。结论: Ang-(1-7) 通过其特异性受体MAS拮抗AngⅡ诱导的HUVEC MCP-1和ICAM-1的表达,并呈浓度依赖性。     

旁路活化补体协同TNF-α对血管内皮细胞ICAM-1表达和粘附作用的影响

目的:探讨旁路活化补体协同TNF-α对血管内皮细胞ICAM-1表达及中性粒细胞-内皮细胞(PMN-EC)粘附的影响。方法:采用酵母多糖活化人血清(ZAHS)单独、和TNF-α协同作用于体外培养的内皮细胞单层, 用直接细胞计数和改良细胞ELISA方法检测中性粒细胞-内皮细胞粘附率的变化和细胞间粘附分子(ICAM-1)的表达。结果:旁路活化补体单独作用于内皮细胞对PMN-EC粘附和ICAM-1的表达仅有轻微影响;和40μg/L的TNF-α共同作用可以明显促进PMN-EC粘附率和ICAM-1的表达。结论:旁路活化补体对TNF-α诱导的PMN-EC粘附及ICAM-1的表达具有促进作用, 从而引起炎症反应。     

脱氢表雄酮抑制高脂诱导的兔主动脉及人脐静脉内皮细胞细胞间黏附分子1的表达

目的:探讨脱氢表雄酮对高脂诱导的兔主动脉及人脐静脉内皮细胞细胞间黏附分子1(ICAM-1)表达的影响,以及全反式维甲酸(ATRA)在这一过程中的作用。方法:细胞实验:将培养的人脐静脉内皮细胞(HUVECs)分为正常对照组、氧化型低密度脂蛋白(ox-LDL)组、ox-LDL+DHEA组、ox-LDL+DHEA+ATRA组和DHEA组。各组细胞均加入相应药物作用24 h,采用RT-PCR和细胞酶联免疫吸附法检测各组细胞ICAM-1 m RNA及蛋白的表达情况。动物实验:将大耳白兔分为正常对照组、高脂组、高脂+DHEA组、高脂+DHEA+ATRA组和DHEA组。各组白兔均用相应饲料喂饲10周后处死动物,采用RT-PCR和免疫组织化学等方法检测各组白兔主动脉ICAM-1的m RNA及蛋白的表达情况。结果:细胞实验:ox-LDL组ICAM-1的表达明显高于正常对照组(P0.05);与ox-LDL组相比,ox-LDL+DHEA组ICAM-1的表达明显降低(P0.05);DHEA组与正常对照组ICAM-1的表达无显著差异(P0.05);ox-LDL+DHEA+ATRA组与ox-LDL+DHEA组ICAM-1的表达无显著差异(P0.05)。动物实验:高脂组主动脉ICAM-1的表达明显高于正常对照组(P0.05);与高脂组相比,高脂+DHEA组ICAM-1的表达明显降低(P0.05);DHEA组与正常对照组ICAM-1的表达无显著差异(P0.05);高脂+DHEA+ATRA组与高脂+DHEA组ICAM-1的表达无显著差异(P0.05)。结论:DHEA能够抑制高脂诱导的兔主动脉及人脐静脉内皮细胞ICAM-1的表达,这可能是其抗动脉粥样硬化的机制之一,而全反式维甲酸对DHEA的这一作用并无明显增强作用。     

替格瑞洛对oxLDL诱导的人脐静脉内皮细胞ICAM-1表达的影响

目的 探究不同浓度的替格瑞洛对氧化型低密度脂蛋白诱导的人脐静脉内皮细胞在蛋白及RNA水平表达细胞间黏附分子-1的影响。方法 离体培养人脐静脉内皮细胞,平均接种于6孔培养板,待细胞生长至融合状态时取三孔加入ox-LDL（50 μg/ml）,再分别加入不同浓度的替格瑞洛（0、20、40 μmol/L）。刺激干预24 h后采用Western Blot法测定ICAM-1的蛋白表达水平。重复实验,采用Real-time PCR法测定ICAM-1的RNA表达水平。结果 ①oxLDL能明显上调ICAM-1的表达;②Western Blot蛋白定量结果显示,oxLDL诱导组ICAM-1的蛋白表达明显高于对应的非诱导组（P＜0.05）;未予替格瑞洛干预组ICAM-1的蛋白表达高于替格瑞洛低浓度组（P＜0.05）;替格瑞洛低浓度组ICAM-1的蛋白表达高于替格瑞洛高浓度组（P＜0.05）;③Real-time PCR结果与Western Blot蛋白定量结果一致。结论 oxLDL能在RNA水平提高ICAM-1表达,替格瑞洛能在RNA水平抑制ICAM-1的表达,并与浓度正相关。     

Effect of palmitic acid and linoleic acid on expression of ICAM-1 and VCAM-1 in human bone marrow endothelial cells (HBMECs)

Introduction

The amount and type of fatty acids (FAs) in the diet influence the risk of atherosclerosis. Palmitic acid and linoleic acid exist at high levels in Iranian edible oils. In this study, we investigated the effect of palmitic acid and linoleic acid on expression of soluble and cell-associated forms of intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) in human bone marrow endothelial cells (HBMECs).

Material and methods

The endothelial cells were induced with bacterial lipopolysaccharide (LPS) or tumor necrosis factor α (TNF-α), and thereafter incubated with palmitic or linoleic acid. The level of soluble and cell-associated VCAM-1 and ICAM-1 were analyzed using ELISA and western blot.

Results

Our findings indicated that palmitic acid up-regulates the expression of ICAM-1 and VCAM-1 in HBMECs when these cells are induced with TNF-α or LPS. In addition, the results suggest that linoleic acid could sustain up-regulated ICAM-1 and VCAM-1 in activated endothelial cells.

Conclusions

Chronic activation of endothelial cells in the presence of palmitic and linoleic may account for pathogenesis of cardiovascular events. These findings provide further support for the detrimental effects of these fatty acids, especially palmitic acid, in promotion and induction of cardiovascular diseases which are prevalent in the Iranian population.     

人白介素10对异种内皮细胞保护作用的研究

目的：研究人白介素10(HIL-10)对活化的牛主动脉内皮细胞(BAECs)的保护作用，为HIL-10用来减轻异种排斥反应、诱导异种移植免疫耐受提供实验依据。方法：用不同浓度的HIL-10(2、5、10、20、40ng/ml)孵育BAECs2小时后，再与肿瘤坏死因子a(TNF-a，ng/ml)共孵育6小时或18小时；应用细胞-酶联免疫吸附分析方法(Cell-ELISA)检测细胞表面的E-seleetin和ICAM-1的表达。用MTT方法测定药物对细胞活性的影响。结果：用HIL-10在一定浓度内预处理BAECs后，能明显抑制TNF-a诱导的E-seleetin与ICAM-1的表达，并呈现一定的剂量依赖性。用MTT方法测定细胞活性的实验表明，各实验组细胞活性与对照组无明显差异性。结论：HIL-10能明显抑制TNF-a活化的BAECs表达Bseleetin与ICAM-1；HIL-10对BAECs有一定的保护作用。     

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     

氯沙坦对自发性高血压大鼠主动脉内膜ICAM-1和PAI-1表达的影响

目的 :比较早期雄性自发性高血压大鼠 (SHR)和正常雄性同周龄WistarKyoto大鼠 (WKY)主动脉内膜细胞间粘附分子 1(ICAM 1)和纤溶酶原激活物抑制剂 1(PAI 1)的表达及氯沙坦对其的影响。方法 :将 2 0只雄性SHR随机分成二组 ,每组 10只 ,其中一组灌喂氯沙坦 2 0mg/kg/天 ,另一对照组给正常饮水 ,共 12周 ,并与WKY 10只比较。采用免疫组织化学方法检测三组大鼠主动脉内膜ICAM 1和PAI 1的表达。结果 :与WKY大鼠比较 ,SHR对照组主动脉内膜ICAM 1和PAI 1表达明显增高 ;经氯沙坦治疗 12周后SHR血压显著降低 ,主动脉内膜ICAM 1和PAI 1表达亦明显下降。结论 :氯沙坦在有效降压的同时也明显抑制SHR主动脉内膜ICAM 1和PAI 1的表达 ,提示氯沙坦作为血管紧张素II受体 1拮抗剂 (AT1 R)在抗高血压并发症发生中起一定的作用     

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。     

缺氧和高糖对大鼠肾成纤维细胞ICAM-1mRNA表达的影响

目的:探讨缺氧和高糖对肾成纤维细胞(NRK)细胞间粘附分子-1(ICAM-1)mRNA表达的影响。方法:将大鼠NRK分6组进行体外培养:(1)正常浓度葡萄糖组(常糖组):5.6mmol/L葡萄糖;(2)常糖+缺氧组:5.6mmol/L的葡萄糖+100μmol/L的CoCl2;(3)高糖A组:15mmol/L葡萄糖;(4)高糖+缺氧A组:15mmol/L葡萄糖+100μmol/L的CoCl2;(5)高糖B组:30mmol/L葡萄糖;(6)高糖+缺氧B组:30mmol/L葡萄糖+100μmol/L的CoCl2。分别于24h、48h取各组NRK采用RT-PCR检测ICAM-1mRNA表达水平。结果:与常糖组相比,高糖A组,高糖B组ICAM-1mRNA表达量逐渐升高(P<0.01),常糖+缺氧组、高糖+缺氧A、B组ICAM-1mRNA表达量也升高(P<0.01);高糖+缺氧A、B组ICAM-1mRNA表达量分别比高糖A、B组明显升高(P<0.01);高糖A、B组和常糖+缺氧组、高糖+缺氧A、B组48hICAM-1mRNA表达量均高于24h表达量(P<0.01)。结论:高糖和缺氧均可导致ICAM-1mRNA高表达,缺氧可能进一步增加高糖上调ICAM-1的表达。     

细胞间黏附分子-1抑制参与大鼠小肠缺血后处理的保护作用

目的观察缺血后处理（I-postC）对缺血／再灌注（I／R）大鼠小肠组织细胞间黏附分子-1（ICAM-1）表达和髓过氧化物酶（MPO）活性的影响，探讨其减轻I／R损伤的机制。方法32只健康雄性Wistar大鼠随机分为假手术（Sham）、I／R、I-postC及缺血预处理（IPC）组，以无创动脉夹夹闭肠系膜上动脉建立小肠I／R损伤模型，常规制备病理切片，光镜下观察肠组织损伤情况。试剂盒测定MPO、超氧化物歧化酶（SOD）活性及丙二醛（MDA）含量，免疫印迹法检测小肠组织ICAM-1和NF-κBP65的表达。结果I-postC明显减轻I／R导致的小肠组织病理变化，抑制I／R所致的小肠组织MPO活性和MDA含量升高（分别为I／R组的68．7％和77、1％，P〈0.05），上调SOD活性（为I／R组的1．2倍，P〈0.05），并下调小肠组织NF-κBP65和ICAM-1表达（分别较I／R组低44．3％和49．0％，P〈0．01）。结论I-postC通过抑制ICAM-1表达和中性粒细胞游出而减轻小肠I／R损伤。