依达拉奉对肝缺血再灌注损伤逆转作用的研究

目的研究依达拉奉影响肝脏缺血再灌注过程中TNF-α的表达情况,探讨依达拉奉对肝脏缺血再灌注损伤的逆转作用。方法将80只Wistar大鼠编号,根据计算机产生随机数字,前40为一组,后40为一组,分为实验组和对照组2组,建立常温下部分肝缺血再灌注损伤动物模型。在肝脏缺血再灌注损伤开始前1 h和开始时对实验组大鼠给予依达拉奉注射液10 ml,对照组则给予同等容量的生理盐水。分别于再灌注后0、1、2及4 h测定肝脏脂质过氧化物酶(LPO)和肝脏谷草转氨酶(AST)浓度;应用RT-PCR法检测肝组织TNF-αmRNA含量,并测定肝组织和血清中TNF-α水平;应用TUNEL染色法检测缺血肝组织的细胞凋亡情况。结果再灌注后1、2及4 h,实验组大鼠肝脏LPO及AST浓度均明显低于对照组(P<0.001);实验组再灌注后1 h时肝组织TNF-αmRNA表达量、肝组织和血清TNF-α含量均明显升高且达峰值,但均明显低于对照组(P<0.05);再灌注后各时相实验组肝细胞凋亡率明显升高,但均明显低于对照组(P<0.05)。结论依达拉奉能抑制氧化应激反应,从而降低肝缺血再灌注损伤;并显著减少炎性细胞因子TNF-α的产生,抑制炎性反应的发生,减少肝细胞的凋亡。     

依达拉奉对大鼠肝脏缺血再灌注时线粒体膜电位的影响

目的 探讨依达拉奉对大鼠肝脏缺血再灌注时线粒体膜电位的影响.方法 成年健康雄性SD大鼠30只,体重250 ～ 300 g,采用随机数字表法,将其随机分为3组(n=10):假手术组(S组)、缺血再灌注组(I/R组)及依达拉奉组(E组),I/R组和E组采用肝脏缺血60 min进行再灌注的方法制备70％肝脏缺血再灌注损伤模型.E组于再灌注前15 min静脉注射依达拉奉3 mg/kg,I/R组给予等容量生理盐水.于再灌注2h时采集静脉血样,测定血清谷丙转氨酶(ALT)和谷草转氨酶(AST)的活性;然后处死大鼠,取肝组织,测定肝细胞凋亡情况,计算肝细胞凋亡指数;制备肝组织单细胞悬液,测定线粒体膜电位;光镜下观察肝组织病理学结果.结果 与S组比较,I/R组及E组血清ALT活性、AST活性和肝细胞凋亡指数升高,线粒体膜电位降低(P＜0.05或0.01);与I/R组比较,E组血清ALT活性、AST活性和肝细胞凋亡指数降低,线粒体膜电位升高(P＜0.05).E组肝组织病理学损伤轻于I/R组.结论 依达拉奉可减轻大鼠肝脏缺血再灌注损伤,其机制与升高线粒体膜电位,抑制肝细胞凋亡有关.     

依达拉奉减轻大鼠小体积肝移植物缺血再灌注损伤

目的 探讨依达拉奉减轻大鼠小体积肝移植物缺血再灌注损伤的作用及其可能机制.方法 采用成年雄性SD大鼠作为肝移植的供、受者,随机将受者分为依达拉奉组和对照组,每组8只.依达拉奉组受者移植前30 min经阴茎背静脉注射依达拉奉3 mg/kg,对照组受者仅给予等量生理盐水.采用改良的二袖套法建立大鼠40%(供肝重量与受者全肝重量比)小体积供肝肝移植模型.术后6 h时,处死两组受者,使用全自动生化分析仪检测血清天冬氨酸转氨酶(AST)和丙氨酸转氨酶(ALT)水平,采用酶联免疫吸附试验(ELISA)法检测移植肝组织中肿瘤坏死因子α(TNF-α)含量,使用相应的检测试剂盒检测移植肝组织中MDA含量以及SOD和MPO的活性.同时,取移植肝组织进行病理学检测,观察肝组织病理损伤情况.结果 术后6h,依达拉奉组受者血清AST和ALT水平分别为(825.50±72.87)U/L和(687.40±72.21)U/L,对照组分别为(1188.03±124.04)U/L和(988.66±91.07)U/L,依达拉奉组明显低于对照组,两组间比较,差异均有统计学意义(P<0.01).与对照组比较,依达拉奉组受者移植肝组织中MDA和TNF-α含量明显下降,MPO活性也明显下降,而SOD活性则明显增加,两组间比较,差异均有统计学意义(P<0.01).移植肝组织病理学检查发现,对照组肝细胞发生明显的空泡样变性伴局部坏死灶,肝小叶结构破坏,门脉周围水肿、充血,炎症细胞浸润明显;依达拉奉组肝损伤明显减轻,小叶结构保存完整,肝细胞变性、坏死轻微,炎症细胞浸润明显减少.结论 依达拉奉能够明显减轻大鼠小体积肝移植物缺血再灌注损伤,其机制可能与增强抗氧化能力、抑制脂质过氧化以及减轻炎症反应密切相关.     

依达拉奉对大鼠重症急性胰腺炎肺损伤的影响

目的探讨依达拉奉(edaravone)对大鼠重症急性胰腺炎(SAP)肺损伤的影响。方法36只成年SD大鼠随机分为正常对照组、模型组及依达拉奉组,每组12只,经胰胆管逆行注射5%牛磺胆酸钠建立SAP大鼠模型。依达拉奉组给予依达拉奉,正常对照组和模型组则给予等量生理盐水。术后6h处死大鼠,检测其血清和肺组织匀浆中超氧化物歧化酶(SOD)活性、丙二醛(MDA)含量,血清中肿瘤坏死因子-α(TNF-α)及白介素(IL)-1、IL-6含量,并计算肺干/湿重比(D/W)。结果模型组血清及肺组织中MDA含量以及血清TNF-α、IL-1和IL-6水平均明显高于正常对照组及依达拉奉组(P0.05),依达拉奉组血清及肺组织中MDA含量以及血清TNF-α、IL-1和IL-6水平也明显高于正常对照组(P0.05);而模型组肺D/W、血清及肺组织中SOD活性则明显低于其他2组(P0.05)。结论依达拉奉能减轻大鼠SAP导致的肺损伤。     

依达拉奉对大鼠心肌缺血再灌注诱发肺损伤的影响

目的 探讨依达拉奉对大鼠心肌缺血再灌注诱发肺损伤的影响.方法 健康清洁级雄性Wistar大鼠24只,体重250～300 g,随机分为4组(n=6):假手术组(S组)、心肌缺血再灌注组(IR组)和不同剂量依达拉奉组(E1组和E2组).IR组、E1组和E2组采用结扎冠状动脉左前降支(LAD)45 min,再灌注3 h的方法制备心肌缺血再灌注模型.S组仅LAD下穿线不结扎;IR组阻断LAD45 min后再灌注3 h;E1组和E2组分别于再灌注前1 min经右股静脉注射依达拉奉3或10 mg/kg.于再灌注3 h时放血处死大鼠,取肺组织、支气管肺泡灌洗液和动脉血样,测定血清肌酸激酶同工酶(CK-MB)活性,计算肺通透性指数(PPI),采用Western blot法检测肺组织β-防御素-2(BD-2)和TNF-α蛋白的表达,PCR法测定肺组织BD-2 mRNA表达.结果 与S组比较,IR组、E1组和E2组血清CK-MB活性和PPI升高,肺组织BD-2 mRNA、BD-2和TNF-α蛋白表达上调(P＜0.01).与IR组比较,E1组和E2组血清CK-MB活性和PPI降低,肺组织BD-2 mRNA、BD-2和TNF-α蛋白表达下调(P＜0.01).与E1组比较,E2组血清CK-MB活性和PPI降低,肺组织BD-2 mRNA、BD-2和TNF-α蛋白表达下调(P＜0.01).结论 依达拉奉可减轻大鼠心肌缺血再灌注诱发的肺损伤,其机制不仅与清除氧自由基有关,还与抑制肺组织炎性反应有关.     

姜黄素对大鼠肝脏冷缺血再灌注损伤的保护作用及其机制

目的探讨姜黄素预处理对大鼠肝脏冷缺血再灌注损伤(IRI)的保护作用及其机制。方法将40只Wistar大鼠随机分为:实验组(21只),于术前2 h将60 mg/kg的姜黄素溶于1mL DMSO中静脉注射;对照组(19只),于术前2h静脉注射1 mL DMSO。肝脏冷灌注时间为30 min,恢复血供复流6 h后处死动物,留取血液和肝脏标本,行血清ALT,AST,LDH和组织匀浆SOD,MDA,MPO测定,并进行组织病理和细胞凋亡检测。酶联免疫吸附试验(ELISA)检测肝组织匀浆中TNF-α及MIP-2的水平变化。结果实验组大鼠血清ALT,AST,LDH水平明显低于对照组(P0.01);实验组MDA,MPO,TNF-α和MIP-2水平较对照组明显降低(P0.05),SOD含量较对照组明显增高(P0.05)。并且实验组大鼠肝组织损伤程度和细胞凋亡程度明显轻于对照组。结论姜黄素预处理能减轻大鼠肝脏冷IRI,其保护机制可能与提高肝组织SOD含量,抑制脂质过氧化与细胞凋亡,下调炎性因子TNF-α和MIP-2的表达以及减少中性粒细胞浸润有关。     

依达拉奉对大鼠小肠缺血-再灌注所致肺损伤的保护作用

目的探讨依达拉奉对大鼠小肠缺血-再灌注所致肺损伤的保护作用。方法雄性SD大鼠18只,随机均分为假手术组(Sham组),缺血-再灌注组(IR组)和依达拉奉组(E组)。Sham组只分离肠系膜上动脉,不做其他处理;IR组分离肠系膜上动脉,从大鼠尾静脉注射与E组等量的生理盐水后,用无创动脉夹夹闭120min后移去动脉夹,再灌注120min;E组在缺血-再灌注前静脉注射依达拉奉6mg/kg。再灌注120min后采集标本。肺组织HE染色后病理学检测,采集腹主动脉血液检测大鼠血清中TNF-α和IL-6浓度,取肺组织检测髓过氧化物酶(MPO)活性和丙二醛(MDA)浓度。结果与Sham组比较,IR组肺泡上皮细胞广泛水肿、炎性细胞浸润、肺泡肺萎陷、肺毛细血管扩张出血;E组肺组织病理改变较IR组明显改善,肺泡炎性渗出减少;E组病理评分为(2.1±0.7)分,明显低于IR组的(5.7±1.1)分,IR组病理评分明显高于Sham组的(1.5±0.2)分(P0.01);血清中TNF-α和IL-6的浓度明显少于IR组,肺组织中MPO活性和MDA浓度明显低于IR组(P0.01)。结论依达拉奉能够明显改善小肠缺血-再灌注性肺损伤。     

大鼠肝脏缺血再灌注及低温保存过程中氧自由基变化的实验研究

目的　观察大鼠肝脏缺血再灌注及低温保存过程中氧自由基的变化。方法　建立大鼠肝脏假手术、热缺血再灌注和原位肝移植模型 ,分别测定再灌注 1h和移植术后 2h下腔静脉血中超氧化物歧化酶 (SOD)、乳酸脱氢酶 (LDH)和血清中脂质过氧化物酶 (LPO)的变化 ,并进行组织学观察。结果　术前 30min静脉注射别嘌醇或灌洗液及保存液中加别嘌醇的实验组大鼠 ,其全血中SOD的活力高于条件相同、但不给予别嘌醇的对照组 ,LPO及LDH的含量低于对照组 ,其各项测定值与假手术组比较 ,差异不显著 ;实验组和假手术组的大鼠肝组织病理改变均轻于对照组。结论　大鼠肝脏缺血再灌注及低温保存过程中氧自由基明显增加 ,并且造成肝脏的损害     

还原型谷胱甘肽对大鼠肝脏缺血再灌注损伤后炎性细胞因子表达的影响

目的 探讨经门静脉注射还原型谷胱甘肽(GSH)对大鼠肝脏缺血再灌注损伤后TNF-α、IL-1β和巨噬细胞炎性蛋白-2(MIP-2)表达的影响及意义.方法 72只雄性SD大鼠平均分为假手术组(SO组)、生理盐水预处理组(IR组)和GSH预处理组(GPC组).建立肝脏缺血再灌注损伤模型,检测再灌注30、60和180 min血清TNF-α、IL-1β含量,以及肝组织中TNF-α mRNA、IL-1β mRNA和MIP-2mRNA表达水平.两独立样本采用t检验,多组比较采用方差分析.结果 GPC组血清TNF-α含量于缺血再灌注180 min后显著低于IR组(t=2.512,P<0.05).而肝组织TNF-αmRNA表达水平于缺血再灌注30 min后即显著低于IR组(t=2.427,P<0.05).GPC组血清中IL-1β含量和肝组织中IL-1βmRNA表达水平于缺血再灌注后各时相点均显著低于IR组(t=2.731,3.825,4.372,3.371,3.972,4.685,P<0.05).GPC组MIP-2 mRNA表达于缺血再灌注60 min和180 min显著低于IR组(t=2.593,5.429,P<0.05).结论 TNF-α、IL-1β和MIP-2等炎性因子在肝脏缺血再灌注损伤中发挥重要作用.GSH能够抑制炎性细胞因子如TNF-α、IL-1β和MIP-2的生成,并发挥抗肝脏缺血再灌注损伤的作用.     

RNA干扰Kupffer细胞肿瘤坏死因子-α减轻大鼠肝脏缺血再灌注损伤

目的 观察RNA干扰肝脏Kupffer细胞肿瘤坏死因子-α(TNF-α)对大鼠肝脏缺血再灌注损伤的保护作用.方法 构建针对大鼠TNF-α基因的短发夹状RNA(shRNA)真核表达载体.肝脏缺血再灌注损伤前48 h经门静脉注射磷酸盐缓冲液(PBS)、空载体或TNF-α shRNA.实验随机分为4组,假手术组、PBS组、空载体组和shRNA组.阻断大鼠70%入肝血流40 min,再灌注6 h检测血清谷丙转氨酶(ALT)、谷草转氨酶(AST)、肝脏Kupffer细胞TNF-α mRNA、血清TNF-α、肝组织中丙二醛(MDA)以及超氧化物岐化酶(SOD)含量.结果 与PBS组和空载体组比较,shRNA组再灌注6 h后血清ALT和AST水平显著降低(P＜0.05),Kupffer细胞TNF-α mRNA水平、血清TNF-α水平(56.6±6.7 pg/ml比87.8±8.7 pg/ml和96.5±7.3 pg/ml,P＜0.05)、肝组织中MDA含量(93.4±13.3 nmol/mg比133.5±12.4 nmo1/mg和136.7±13.6 nmol/mg,P＜0.05)显著降低,SOD活性显著升高(22.4±4.6 U/mg比12.2±3.1 U/mg和11.4±2.9 U/mg,P＜0.05).结论 RNA干扰Kupffer细胞TNF-α基因的表达可以减轻大鼠肝脏缺血再灌注损伤.     

MCI-186 (edaravone), a free radical scavenger, attenuates hepatic warm ischemia–reperfusion injury in rats

Hepatic warm ischemia-reperfusion injury (IRI) during hepatectomy and liver transplantation is a major cause of liver dysfunction in which the pathologic role of free radicals is a major concern. To assess the effect of MCI-186 (edaravone) on hepatic IRI, male Wistar rats were subjected to partial hepatic ischemia for 60 min after pretreatment with vehicle (group C) or MCI-186 (group M), or after both MCI-186 pretreatment and additional administration of MCI-186 12 h after reperfusion (group MX). Groups M and MX showed significantly lower levels of serum alanine aminotransferase and hepatic lipid peroxidation than group C, and also significantly lower expression levels of mRNA for cytokines, chemokines and intercellular adhesion molecule-1. There were fewer tissue monocytes and neutrophils in groups M and MX than in group C. These effects were more marked in group MX than in group M. Our findings suggest that treatment with MCI-186 attenuates hepatic IRI in this rat in vivo model.     

Edaravone reduces ischemia-reperfusion injury mediators in rat liver

BACKGROUND: In hepatic ischemia-reperfusion (I/R) injury, oxidative stress both directly injures the liver and promotes an inflammatory reaction by up-regulating various inflammatory mediators. We investigated whether edaravone, a new hydroxy radical scavenger, could reduce hepatic I/R injury including expression of inflammatory mediators such as cytokines and adhesion molecules. MATERIALS AND METHODS: Male Sprague-Dawley rats were subjected to 30 min of partial hepatic pedicle clamping (70%) followed by reperfusion. Just after initiation of reperfusion and again 1 h later, edaravone was administered intraportally. After reperfusion hepatic lipid peroxidation was measured by thiobarbituric acid assay, and hepatic injury was quantified by measuring hepatic enzymes in plasma. We serially quantified hepatic expression of mRNAs for tumor necrosis factor (TNF)-alpha and E-selectin, and histologically examined E-selectin expression and neutrophil accumulation. RESULTS: In the edaravone group, hepatic lipid peroxidation and hepatic enzyme leakage were significantly less than in the saline group. Hepatic expression of TNF-alpha and E-selectin mRNAs was significantly lower in the edaravone than the saline group, at 2 h after initiation of reperfusion. Histologically, E-selectin immunoreactivity and neutrophil accumulation were less evident in hepatic sections from the edaravone group. CONCLUSIONS: Edaravone reduced hepatic I/R injury by minimizing oxidative stress, and inhibited subsequent injurious inflammation by reducing expression of inflammatory cytokines and adhesion molecules.     

Recombinant Human Soluble Thrombomodulin Attenuates Hepatic Ischemia and/or Reperfusion Injury by Inhibiting Leukocyte Accumulation in Mice With Normal and Fatty Liver

In an attempt to increase the number of donor livers, there has been an increased use of marginal donor livers, such as steatotic (fatty) livers that increase susceptibility to ischemia and reperfusion injury (IRI). Inflammatory cell accumulation has a greater role in IRI in steatotic liver than in normal liver. Although the recombinant human soluble thrombomodulin (rhsTM) attracts attention as a new treatment for disseminated intravascular coagulation, the therapeutic efficacy of rhsTM in hepatic IRI remains uncertain, especially in fatty livers. We aimed to demonstrate the effect of rhsTM on hepatic IRI using well-established in vivo experimental models with steatotic liver.

大鼠肝脏缺血再灌注损伤早期载脂蛋白M的表达

目的 探讨大鼠肝缺血再灌注损伤早期肝内载脂蛋白M mRNA(apoM mRNA)及血浆apoM的表达。方法 建立大鼠肝脏缺血再灌注损伤模型。健康雄性SD大鼠40只随机分成5组，每组8只：假手术组(对照组)；IR1组(灌注0．5h)；[R2组(灌注1．0h)；IR3组(灌注2．0h)；[R4组(灌注3．0h)。缺血再灌注组的缺血时间统一为1．0h。检测血浆谷丙转氨酶水平(ALT)、肝组织病理变化、血浆apoM蛋白及肝组织apoM mRNA。结果 血浆ALT的水平随着灌注时间的延长而升高，肝组织损伤随着灌注时间的延长而逐渐加重。肝组织apoM mRNA的表达则先有一过性下降(灌注0．5h组)，此后随着灌注时间的延长其表达明显增强。血浆apoM蛋白有相同的变化趋势，但其表达在灌注2．0h才有上升。结论 在肝缺血再灌注损伤过程中，肝脏apoM mRNA的表达和血浆蛋白水平有迅速、明显的变化，提示apoM可能具有急性时相反应蛋白的特性。     

Pharmacological preconditioning of rat liver by up-regulation of heme oxygenase 1

PURPOSE: We investigated whether pharmacologically induced up-regulation of heme oxygenase 1 by pyrrolidine dithiocarbamate (PDTC) conferred protection against subsequent ischemia-reperfusion injury (IRI) to the rat liver after temporary vascular occlusion of 70% of the organ. METHODS: Female Wistar rats (200 to 250 g body weight) anesthetized with pentobarbitone were cannulated in the carotid artery and jugular vein. After laparotomy, a rubber band was applied around the entire vascular supply to the median and left lateral lobes, enabling vascular occlusion of 70% of the liver. A laser Doppler miniprobe was placed on the left lateral lobe to monitor peripheral liver blood flow (PLBF). Immediately upon completion of the surgery, the rats were administered either PDTC (50 mg/kg intravenously; n = 8) or its solvent (isotonic NaCl; n = 8). After 60 minutes, regional ischemia was induced for 30 minutes. The animals were then monitored for 2 hours of reperfusion. Blood samples for alanine transferase (ALT) estimation (as a measure of parenchymal injury) were drawn immediately prior to ischemia and reperfusion, as well as 60 and 120 minutes after reperfusion; PLBF was calculated at these times. RESULTS: ALT increased in the course of the experiments but there was no difference between the groups. The reduction in PBLF due to ischemia-reperfusion was significantly lower in the PDTC group: about 16% versus 40%, after 2 hours of reperfusion. CONCLUSION: Pretreatment with PDTC attenuated the disturbance of hepatic microcirculation, but not parenchymal injury, in the early phase of IRI.     

Intrahepatic expression and release of vascular endothelial growth factor following orthotopic liver transplantation in the rat

BACKGROUND: Morphological and functional changes to sinusoidal endothelial cells mediated by soluble factors released from activated Kupffer cells, including cytokines, are considered pivotal events in ischemia/reperfusion injury (IRI) to liver grafts. Vascular endothelial growth factor (VEGF) is an endothelial cell-specific cytokine with potent pro-inflammatory and mitogenic effects. We investigated the possible role of VEGF in IRI to liver grafts using a syngeneic rat orthotopic liver transplantation model. METHODS: Transplantation was performed in Lewis rats using livers preserved for various periods of time (24-48 hr) in University of Wisconsin solution at 4 degrees C. Systemic VEGF levels were measured by enzyme-linked immunosorbent assay (ELISA). Intrahepatic VEGF expression was analyzed by Northern blotting and in situ hybridization. The effects of anti-VEGF neutralizing antibody treatment on the extent of IRI were assessed by measuring liver function tests, lipid peroxidation, and metalloproteinase activity. RESULTS/CONCLUSION: VEGF is expressed and released in a biphasic pattern during the early postoperative period after liver transplantation. Anti-VEGF antibody treatment, administered during reperfusion, decreased the degree of damage, suggesting that VEGF may have a role in IRI to liver grafts.     

枯否细胞在肝移植手术后缺血再灌注损伤中的作用

目的总结枯否细胞在肝移植术后缺血再灌注损伤中的作用。方法通过复习文献的方法对枯否细胞在缺血再灌注损伤中的作用进行综述。结果枯否细胞是肝内固有的巨噬细胞,肝移植手术后枯否细胞被激活释放一系列炎症介质,包括细胞因子、活性氧中间产物、趋化因子等,启动缺血再灌注损伤(ischemia reperfusioninjury,IRI),使移植肝失功。同时,枯否细胞不仅可以通过释放NO来减轻缺血再灌注损伤,也可以特异性的产生血红素加氧酶-1(heme oxygenase-1,HO-1)来发挥对缺血再灌注损伤的保护作用,并且有研究表明HO-1降解血红素产生的代谢产物一氧化碳(carbon monoxide,CO)也有同样的作用。结论枯否细胞在肝移植术后可以发挥双向性作用,如何减少枯否细胞释放各种有害物质,增加有利物质的表达,是今后预防移植肝后缺血再灌注损伤研究的关键。     

Remote ischaemic preconditioning of the hind limb reduces experimental liver warm ischaemia-reperfusion injury

BACKGROUND: Direct ischaemic preconditioning of the liver reduces ischaemia-reperfusion injury (IRI). Remote ischaemic preconditioning (RIPC) of a limb has been shown to reduce IRI to the heart. This study determined the effect of brief remote ischaemia to the limb in reducing early liver warm IRI. METHODS: Twenty-eight male rabbits were allocated to four groups: sham operated, RIPC alone, IRI alone, and RIPC plus IRI. RIPC was induced in the leg with a tourniquet, before liver IRI, by three alternate cycles of 10 min ischaemia followed by 10 min reperfusion. Liver IRI was produced by total inflow occlusion for 25 min. Markers of liver injury and systemic and hepatic haemodynamics were measured for 2 h after reperfusion. RESULTS: At 2 h, IRI alone was associated with increased serum levels of aminotransferases, and reduced mean arterial blood pressure, hepatic blood flow and peripheral oxygen saturation. There was significant improvement in these variables in animals that had RIPC before liver IRI, and hepatic venous nitrate/nitrite levels were also significantly higher. CONCLUSION: In this experimental model RIPC appeared to reduce liver IRI.     

缺血后处理对缺血再灌注大鼠肝细胞即刻早期基因c-fos和c-jun表达的影响

目的 观察缺血后处理对大鼠肝脏缺血再灌注损伤的影响。方法 120只Wistar大鼠随机分为缺血再灌注组（IRI），缺血后处理组（IPO）和假手术组（S），于复灌后0，0．5，1，2，4，8，12，24h取材，应用RT-PCR法检测各组c-fos，c-jun mRNA的表达。结果 （1）在IRI组再灌注后0．5～2h，c-fos和c—jun的表达均增高，1h达高峰；4h后仅c-jun有持续较高的表达，c—fos的表达开始下降；（2）IPO组各时点c-fos mRNA的表达均较IRI组低，但无统计学差异（P〉0．05）；（3）与IRI组相比，IPO组c-jun mRNA在0．5，1h和2h组明显降低（P〈0．05）。结论 缺血后处理能有效地保护肝脏免受缺血再灌注造成的损伤，这种保护效应的机制可能与影响即早基因的转录有关。