血红素氧合酶对大鼠肺缺血再灌注损伤的保护作用

探讨血红素氧合酶 1(HO 1)对大鼠肺缺血再灌注损伤 (I/R)的保护作用。Wistar大鼠随机分成假手术 (sham)组、I/R组、Hemin组和ZnPP IX组。采用夹闭大鼠左肺门 30min ,再灌注 12 0min ,分别观察各组HO 1活性 ,肺组织形态学变化 ,肺湿干重比、伊文思蓝含量、支气管肺泡灌洗液 (BALF)中细胞计数及蛋白含量变化。与sham组比较 ,I/R组和hemin组肺组织HO 1活性显著增高 (P <0 0 1) ,ZnPP IX组能取消hemin诱导的HO 1活性增高 (P <0 0 1)。光镜下可见I/R组和ZnPP IX组肺组织水肿 ,部分动物肺泡腔中可见出血 ,并伴有局部肺不张 ,而hemin组肺组织形态学改变明显减轻。Hemin组肺湿干重比、伊文思蓝含量、BALF中细胞数和蛋白含量均低于I/R组和ZnPP IX组 ,但仍高于sham组 (P <0 0 1)。结果提示 ,HO 1对在体大鼠肺I/R损伤具有部分保护作用     

丹参对大鼠移植肝血红素氧合酶1表达的影响

背景：器官移植前使用丹参预处理能够保护组织缺血-再灌注损伤,改善移植器官存活率。 目的：观察含丹参的冷灌注液对同种异体大鼠移植肝脏中血红素氧合酶1表达的影响,以及对供体肝脏缺血-再灌注损伤的保护作用。 方法：将SD雄性大鼠随机分成UW液组(术中使用UW液灌注保存)、丹参+UW液组(术中使用丹参+UW液灌注保存)、ZnPP预处理组(移植前24 h腹腔内注射ZnPP,术中使用丹参+UW液灌注保存),建立稳定的大鼠同种异体肝移植模型。同时取10只正常大鼠作为正常对照。 结果与结论：丹参+UW液组和UW液组血清总胆红素、谷丙转氨酶、谷草转氨酶水平明显低于ZnPP预处理组(P < 0.01)。血红素氧合酶1mRNA及其蛋白在丹参+UW液组中较UW组表达更明显,在ZnPP预处理组中表达明显受到抑制(P< 0.05)。丹参+UW液组肝脏Suzuki标准评分明显低于ZnPP预处理组及UW液组(P < 0.05)。表明丹参能上调同种异体的大鼠移植肝脏中血红素氧合酶1 mRNA及其蛋白的表达,减轻供肝缺血-再灌注损伤,保护移植大鼠肝脏。     

一氧化氮途径在大鼠肝移植缺血再灌注损伤中的作用

本实验应用三袖套法大鼠原位肝移植模型,探讨一氧化氮途径在大鼠原位肝移植缺血再灌注损伤中对移植肝的功能作用及可能机制。加强一氧化氮途径能显著延长受体的存活率,改善肝功能及抑制肿瘤坏死因子（Ｔｈ卜ａ）的合成与表达;而抑制ＮＯ合成则能明显降低术后受体存活率、加剧肝功能恶化,上调ＴＮＦ－ａ及Ⅰ型细胞间粘附分子（ＩＣＡＭ－１）的表达。提示：ＮＯ途径很可能是肝移植缺血再灌注损伤的关键因素。     

细胞间粘附分子-1在大鼠肾缺血再灌注中的表达

观察肾缺血再灌注过程中，细胞间粘附分子-l(ICAM-1)在肾组织中的表达。大鼠随机分正常组和缺血再灌注模型组，应用免疫组化方法检测肾组织中ICAM-l的表达，经图象分析定量正常对照组和模型组(肾缺血lh，再灌注24、48、72和96h)ICAM-1的表达水平。正常组肾组织未见ICAM-l表达，模型组大鼠肾缺血1h未再灌注时亦未见ICAM-1的表达，再灌注24h出现明显的ICAM-1表达，48～72h达高峰，并持续至96h。提示ICAM-1介导并参与了肾缺血再灌注的损伤机制。     

骨桥蛋白在大鼠肝缺血/再灌注损伤中的作用

目的 研究大鼠肝缺血/再灌注损伤(HI/RI)过程中骨桥蛋白(OPN)的作用。方法 将大鼠分为假手术组(sham)和缺血/再灌注(I/R) 6、12和24 h组,每组6只。苏木精-伊红染色(HE染色)观察肝组织的形态学变化;比色法检测大鼠血浆中天门冬氨酸氨基转移酶(AST)、丙氨酸氨基转移酶(ALT)水平及肝组织中超氧化物歧化酶(SOD)活力和丙二醛(MDA)含量;RT-qPCR测定肝组织OPN mRNA表达;ELISA测定肝组织OPN含量。结果 与sham组相比,HE染色提示I/R后肝细胞有明显的变性和坏死,以I/R 24 h组最为明显;血浆中AST和ALT水平增高,I/R 12 h时最显著(P<0.01);肝组织中MDA含量升高、SOD活力降低,I/R 24 h最显著(P<0.01);肝组织OPN mRNA表达量在I/R各组均有显著升高(P<0.01),OPN含量在I/R 24 h组显著增加(P<0.05)。结论 OPN参与了大鼠HI/RI的发生,它可能是评价肝脏损伤的重要指标。     

灌注速度对移植肝脏缺血再灌注的损伤

背景：近年来有学者研究发现供体灌注的压力可直接影响移植物的能量代谢从而影响其活力,适当的灌注压力能明显提高供体的质量。 目的：观察不同灌注速度对大鼠移植肝脏再灌注损伤的影响。 方法：采用改良的Kamada双袖套法建立SD→SD原位肝移植模型。供体肝脏获取时分别以50,100,150,200 mL/h进行灌注。检测移植后外周血清肿瘤坏死因子α和谷丙转氨酶水平,观察肝脏组织病理学改变和肝脏组织内皮源性一氧化氮合酶的表达变化。 结果与结论：与低灌注速度相比,供体肝脏制备过程中200 mL/h的灌注速度导致了更加明显的肝脏病理形态学改变,肝细胞变性、肝血窦扩张和炎细胞浸润也更加明显。术后24 h肝功能的检测也发现,150,200 mL/h灌注速度组外周血谷丙转氨酶活性、肿瘤坏死因子水平明显高于50,100 mL/h灌注速度组(P < 0.05,P < 0.01),内皮源性一氧化氮合酶表达明显低于50,100 mL/h灌注速度组(P < 0.01),100 mL/h灌注速度后,随着灌注速度的增加肝功能损伤也明显加重。证实适当的灌注压力和速度是获得高质量供体的保障,能够减轻移植后肝功能损伤,改善受体预后,在大鼠肝移植供体制备过程中    100 mL/h是适宜的灌注速度。     

细胞穿透肽PEP-1介导血红素加氧酶1预处理对大鼠肝脏缺血再灌注损伤的保护作用

目的:探讨细胞穿透肽PEP-1介导的血红素加氧酶-1(HO-1)对大鼠肝脏缺血再灌注损伤(HIRI)的保护作用。方法:(1)用基因工程学方法人工合成融合蛋白PEP-1-HO-1。(2)选择雄性SD大鼠,随机分为三组(n均=8):假手术组(S组)只开腹,不予干预。HIRI模型组(HIRI组),采用夹闭肝动脉和门静脉30min后恢复血流;HIRI+PEP-1-HO-1预处理组(HIRI+HO-1组),夹闭肝动脉和门静脉前经门静脉注射PEP-1-HO-1蛋白1mg,其余处理同HIRI组。(3)实验完成后,取三组大鼠下腔静脉血,采用自动生化分析仪测定血清谷丙转氨酶(ALT)、谷草转氨酶(AST)、γ-谷氨酰转肽酶(γ-GT)、总胆红素(TBIL)等肝功能指标。处死大鼠,取部分肝脏进行组织切片、HE染色,观察各组肝组织病理学变化。结果:成功制备高纯度PEP-1-HO-1融合蛋白。HIRI组大鼠各项肝功能指标均显著高于S组(P0.01),HIRI+HO-1组各项肝功能指标值明显低于HIRI组(P0.01),但仍高于S组(P0.05)。HIRI组肝细胞肿大或呈球形,胞浆疏松水样变或完全透明,伴炎细胞浸润,可见片状坏死。HIRI+HO-1组肝脏损伤程度较HIRI组明显改善,炎性细胞浸润及肝细胞坏死程度明显减轻,但与S组比较,肝脏组织损伤仍明显。结论:用细胞穿透肽PEP-1介导HO-1预处理能有效保护肝细胞,明显减轻肝功能损害。     

普鲁卡因在肝缺血再灌注损伤中的作用

目的肝缺血/再灌流损伤的程度直接影响到肝脏手术的预后,因而寻找一种能减轻肝缺血/再灌流损伤的方法。方法肝门阻断45min,通过对大鼠在活体显微镜下不同时间点肝血窦血流速度及血管管径变化的观察及肝组织的病理切片检查,观察普鲁卡因对大鼠肝脏血管支配神经的控制。结果肝门结扎前用2％普鲁卡因封闭,白细胞的浸润程度明显减轻,血流速度得到改善。结论普鲁卡因对控制改善肝缺血/再灌流损伤起积极作用。     

不同缺血后处理方案对大鼠肾脏缺血再灌注损伤的保护作用

目的 试建立恰当的大鼠肾脏缺血再灌注损伤（IRI）的缺血后处理模型。方法 选8 ～ 12周健康60只SD雄性大鼠,体质量220 ～ 260 g。随机分为6组：对照组（S组）、缺血再灌注组（IR组）及IR缺血后处理A、B、C、D组,每组10只。S组：分离出双侧肾蒂,仅行右肾蒂结扎和左肾蒂游离;IR组：结扎右侧肾蒂,夹闭左侧肾蒂60 min后恢复灌注;缺血后处理A、B、C、D组在肾脏缺血60 min后分别进行6次（开放10 s ＋ 阻断10 s）、5次（开放20 s ＋ 阻断20 s）、3次（开放10 s ＋ 阻断10 s）、3次（开放2 min ＋ 阻断2 min）的循环,然后充分开放灌注。再灌注24 h后监测肾功能,对肾组织结构损伤程度评分。结果 与IR组相比,A、B、C、D组后处理的血尿素氮（BUN）、血肌酐（SCr）及肾小管损伤程度评分均降低（P 〈 0.05）,肾组织损伤明显减轻。处理组中,A、B两组的BUN、SCr及肾小管损伤程度评分相当（P 〉 0.05）,且缺血后处理效果优于C、D两组（P 〈 0.05）。结论： 采用缺血后处理A组方法和B组方法均可以成功制作出缺血后处理模型。     

葛根素对肝缺血再灌注损伤的保护作用

近年来 ,有关葛根素改善心脑循环和免疫调节作用的临床研究较多。但葛根素对肝缺血再灌注损伤 (ｈｅｐａｔｉｃｉｓｃｈｅｍｉ ａ ｒｅｐｅｒｆｕｓｉｏｎｉｎｊｕｒｙ ,ＨＩＲＩ)的保护作用的研究 ,国内外未见报道。本研究测定家兔肝缺血前 ,缺血 4 5ｍｉｎ ,再灌 4 5ｍｉｎ的血清及肝组织中乳酸脱氢酶 (ＬＤＨ)活性的变化 ,并观察了葛根素对其影响 ,从而了解葛根素对ＨＩＲＩ的保护作用 ,为ＨＩＲＩ的防治提供理论依据。1　材料和方法1 1　材料 :葛根素注射液 ,陕西安康济仁制药公司产品 ,批号0 10 914 ;全自动生化分析仪 ,日本日立 70 6 …     

The influence of retrograde reperfusion on the ischaemia‐/ reperfusion injury after liver transplantation in the rat

Dysfunction of the graft after liver transplantation caused by ischaemia‐/reperfusion (I/R) injury is a serious clinical problem. The aim of this study was to evaluate the influence of different kinds of reperfusion on I/R injury in a rat model. Arterialized orthoptic rat liver treatment was performed on male LEWIS‐(RT¹)‐rats. Three groups (n = 7) were formed. Group I: antegrade reperfusion with a 6‐min delayed reperfusion via the hepatic artery. Group II: Antegrade reperfusion, simultaneously, via the portal vein and the hepatic artery. Group III: Retrograde reperfusion via the vena cava. Serum parameters were determined one, 24 and 48 h after operation. Furthermore, after 48 h, the liver was taken for histological assessment. After 48 h, rats of group III showed significantly lower aspartate amino transferase and alanine amino transferase serum levels compared with group I and group II rats. Forty‐eight hours after transplantation, glutamate dehydrogenase serum level was significantly lower in group III than in group II. In histology, group III livers showed significantly less necrotic spots than group I and group II livers. Maximum size of the necrotic spots was significantly lower in group III than in group I. Also, significantly more necrotic spots were seen in the ‘Rappaport′s zone’ 1 and 2 of group I than in group III. Our data suggested that the expression of I/R‐injury correlates with the type of reperfusion. Furthermore, under standard conditions, this study was able to demonstrate that in a rat model, the retrograde reperfusion leads to a lower expression of I/R‐injury than the antegrade reperfusion.     

The protective effect of boric acid on cholestatic rat liver ischemia reperfusion injury

Background/aim To evaluate the potential protective effects of boric acid (BA) in experimental cholestatic liver ischemia reperfusion (IR) injury model.Materials and methods The study included 24 female rats which were divided into 3 groups each containing 8 rats. The control group (Group 1) only received laparotomy. In the IR group (Group 2) biliary tract ligation was applied and 1 week later 45 min ischemia and 1 h reperfusion with relaparotomy without any treatment was implemented. In the treatment BA+IR group (Group 3). 1 week after the biliary ligation intraperitoneal administration of 200 mg/kg BA was given 10 min before the ischemia for 45 min and reperfusion for 1 h with relaparotomy. Liver tissue and blood samples were taken for histopathological and biochemical examination. Ischemia modified albumin (IMA), SCUBE1, total antioxidant status (TAS), and total oxidant status (TOS) levels were also examined.Results Compared to control, groups IR and BA+IR had higher serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), lactate dehydrogenase (LDH), total, and direct bilirubin levels. Albumin value was high in the control group and low in the other groups. In terms of IMA levels there was no significant difference between groups (p > 0.05). When SCUBE-1 levels were examined groups IR and BA+IR were significantly higher than the group 1. TAS was highest in the group BA+IR whereas TOS was highest in the group IR and lower in the group BA+IR. In histopathological analysis, loss of intercellular border loss in hepatocytes, diffuse nuclear pycnosis and mild to moderate neutrophilic cell infiltration were observed in the IR group. Statistically significant dissociation, hemorrhage and severe neutrophilic cell infiltration were seen in hepatocytes of rats with IR (p < 0.05). Conclusion BA has promising results in the treatment of experimental IR injury of the cholestatic liver because of its antioxidant effects. It may be used in clinical practice after more extensive studies about the effects of BA on IR injury of the cholestatic liver.     

Influence of ezetimibe on selected parameters of oxidative stress in rat liver subjected to ischemia/reperfusion

Introduction

Ischemia/reperfusion (I/R) is considered to be one of the main causes of liver damage after transplantation. The authors evaluated the effect of ezetimibe on selected oxidative stress parameters in ischemic/reperfused (I/R) rat liver.

Material and methods

Rats were administered ezetimibe (5 mg/kg) (groups E and E-I/R) or saline solution (groups C and C-I/R) intragastrically for 21 days. Livers of animals in groups C-I/R and E-I/R were subjected to 60 min of partial ischemia (left lateral and median lobes) followed by 4 h of reperfusion. Alanine and asparagine aminotransferase (ALT, AST) activity was determined in blood before I/R and during reperfusion (at 15 and 240 min). After the reperfusion period, malondialdehyde (MDA), superoxide dismutase (SOD), glutathione (GSH) and glutathione peroxidase (GPx) were determined in liver homogenates using colorimetric methods.

Results

Ezetimibe caused a significant increase in GSH level in groups subjected to I/R (E-I/R (99.91 ±9.01) vs. C-I/R (90.51 ±8.87), p < 0.05). Additionally, under I/R the decrease of GPx activity in the drug-treated group was lower compared to the non-treated group (E-I/R (3.88 ±1.11) vs. E (5.31 ±1.83), p = 0.076). Neither ezetimibe nor I/R affected SOD or MDA levels. I/R produced a significant increase in aminotransferase levels (ALT240-0: C-I/R (42.23 ±43.56) vs. C (9.75 ±11.09), and E-I/R (39.85 ±26.53) vs. E (4.38 ±1.36), p < 0.05 in both cases; AST 240-0: E-I/R (53.87 ±17.23) vs. E (24.10 ±9.66), p < 0.05) but no effect of ezetimibe on those enzymes was found.

Conclusions

Ezetimibe demonstrates antioxidant properties in rat livers subjected to I/R. However, neither a hepatoprotective nor a hepatotoxic effect of ezetimibe was demonstrated, regardless of I/R.     

HMGB1与肝缺血再灌注损伤相关性的研究进展

高迁移率族蛋白B1(High mobility group box 1,HMGB1)是存在于真核生物细胞内一类典型的非组蛋白染色体结合蛋白,参与基因转录、DNA修复、细胞分化及细胞外信号传导,当其释放到细胞外时,可导致一系列的炎症级联反应。缺血再灌注是肝切除术和肝移植过程中无法避免的环节,是导致术后炎症反应、肝细胞坏死、移植肝无功能和急、慢性排斥反应的重要原因。已有研究表明HMGB1在肝缺血再灌注损伤中起到十分重要的作用,对损伤过程中与HMGB1相关的环节研究,将成为预防和治疗肝缺血再灌注损伤的重要途径,充分的了解HMGB1在肝缺血再灌注损伤中的作用及其机制,已经成为目前研究的焦点之一。因此本文就此作一简要综述。     

紫檀芪激活血红素加氧酶-1减轻小鼠脑缺血再灌注后线粒体氧化损伤

目的:探索紫檀芪(pterostilbene,PTE)对小鼠脑缺血再灌注(IR)后线粒体氧化损伤的作用及可能机制。方法:通过双侧颈总动脉阻断法建立小鼠脑IR模型,腹腔注射PTE或Zn PP(血红素加氧酶-1抑制剂),动物随机均分为IR组、PTE+IR组、PTE+Zn PP+IR组、Zn PP+IR组,并且PTE有2.5 mg/kg、5 mg/kg、10 mg/kg三个剂量组。然后,进行神经功能评分;通过干湿比重法测定脑水肿;火焰光度法测定Na~+含量;Neu N和TUNEL法测定细胞存活和凋亡;通过线粒体膜电位(MMP)、线粒体活性氧(ROS)产物和线粒体复合物I和IV活性测定来检测线粒体的氧化应激损伤;通过Western Blot检测血红素加氧酶-1(HO-1)、NADPH醌氧化还原酶-1(NQO1)、谷胱甘肽S-转移酶(GST)、线粒体和胞浆细胞色素c蛋白的表达。结果:PTE可以提高小鼠的神经功能评分、减轻脑水肿和降低脑Na~+含量。PTE上调HO-1、NQO1和GST的表达,提高MMP、线粒体复合体I/IV活性和线粒体细胞色素c水平,减少线粒体ROS产物和降低胞浆细胞色素c水平,并且有一定的剂量依赖性。但是,PTE的这些作用可以被HO-1的抑制剂Zn PP逆转。结论:在脑IR模型小鼠,PTE通过激活HO-1信号减轻线粒体氧化应激损伤和细胞死亡,从而发挥脑保护作用。     

血红素氧化酶1对移植肝脏缺血再灌注损伤的保护

背景：在肝移植过程中,肝脏的缺血再灌注损伤导致的移植肝原发性无功能一直困扰着广大移植专家学者。血红素氧化酶1参与多种疾病及病理过程,通过抗氧化、抗炎、抗凋亡等多种机制发挥组织器官保护作用。 目的：对血红素氧化酶1对移植肝缺血再灌注损伤的保护作用进行综述。 方法：由第一作者应用计算机检索PubMed数据库1992年1月至2009年12月及中国期刊网全文数据库2003年1月至2010年12月有关血红素氧化酶1对移植肝缺血再灌注损伤保护作用的文章,英文检索词为“heme oxygenase-1,ischemia-reperfusion injury,liver graft”,中文检索词为“血红素氧化酶1,移植肝,缺血再灌注损伤”。排除研究目的与课题无关及内容重复的研究,共保留34篇文献进行综述。 结果与结论：血红素氧化酶1可能是哺乳动物体内分布最广、保护作用最重要的基因。血红素氧化酶1及其催化产物组成了机体重要的内源性保护系统,参与多种疾病及病理过程,通过抗氧化、抗炎、抗凋亡等多种机制发挥组织器官保护作用,具有重要的临床应用潜能。血红素氧化酶1对移植肝的缺血再灌注损伤具有明显的保护作用,如何通过转基因手段将其应用于临床,保护移植肝减轻缺血再灌注损伤,提高移植肝成活率,有着广阔的临床应用前景,也是未来所要研究的方向。     

人参皂苷Rg1预处理对大鼠离体心缺血/再灌注损伤的保护作用

目的:探讨人参皂苷Rg1对离体大鼠心缺血/再灌注(I/R)损伤的保护作用。方法:选取SPF级SD大鼠随机分为正常对照组、I/R组、人参皂苷Rg1(1、5、10、20μmol/L)处理组。利用Langendorff灌流系统建立大鼠离体心I/R损伤模型。IabOhart电生理系统实时监测心功能指标,血清生化检测心流出液中心肌酶含量,TTC染色法测定心肌梗死面积。结果:不同浓度人参皂苷Rg1均可改善心肌I/R损伤引起的左室发展压(LVDP)和左室内上升/下降最大速率(±dp/dt_(max))的下降,并降低流出液巾乳酸脱氢酶(LDH)、肌酸激酶同工酶(CK MB)、肌红蛋白(MYO)和肌钙蛋白I(TroI)的含量,显著减少心肌梗死面积。其中5μmol/L和10μmol/L浓度的人参皂苷Rg1对心的保护作用最显著。结论:人参皂苷Rg1具有药物预适应作用,改善心肌I/R损伤后的心肌生理功能,减少流出液中心肌酶的释放和心肌梗死面积,从而发挥抗心肌I/R损伤的保护作用。     

Apelin-13对离体缺血/再灌注大鼠心脏损伤的影响

目的观察apelin-13对离体大鼠缺血/再灌注心脏损伤的影响,并初步探讨其对apelin受体APJ(putative re-ceptor protein related to the angiotensin receptorAT1)及细胞信号Akt1/2的影响。方法Langendorff装置恒流灌注大鼠离体心脏,采用停灌/复灌方式复制缺血/再灌注模型;观察缺血/再灌注期间心脏收缩期左心室内压上升的最大变化速率( LVdp/dtmax)及舒张期左心室内压下降的最大变化速率(-LVdp/dtmax);RT-PCR和Western blot测定组织中APJ受体mRNA和Akt1/2蛋白的表达情况。结果Apelin-13可以增加缺血/再灌注损伤心脏的±dp/dtmax(P<0·01);可以明显增强心肌组织中Akt1/2的表达;缺血/再灌注可以引起心肌组织中APJ受体表达上调。结论Apelin-13拮抗缺血/再灌注引起的心脏收缩及舒张功能障碍;可能与组织中APJ受体表达上调引起Akt1/2表达增强有关。     

橄榄苦苷对大鼠局灶性脑缺血再灌注损伤和炎性反应的作用

目的:探讨橄榄苦苷(OE)对大鼠局灶性脑缺血/再灌注损伤和炎性反应的作用。方法:雄性SD大鼠随机分为假手术组(Sham组)、溶媒处理组(Vehicle组)和OE处理组(OE组)。用线栓法制作大脑中动脉脑缺血/再灌注(MCAO/R)模型。TTC染色检测脑梗死体积,免疫组化法检测缺血侧大脑皮层髓过氧化物酶(myeloperoxidase,MPO)和肿瘤坏死因子(TNF-α)表达,Western Blot法检测基质金属蛋白酶-9(matrix metallopeptidase 9,MMP9)及基质金属蛋白酶-2(matrix metallopeptidase 2,MMP2)的表达。结果:(1)Vehicle组大脑缺血侧有明显的梗死灶,而OE处理组脑梗死体积明显有所缩小(P0.01)。(2)Vehicle组MPO和TNF-α表达与Sham组相比显著提高(P0.01),而OE组两者的表达较Vehicle组明显降低(P0.01,P0.05)。(3)Western Blot显示:Vehicle组MMP2、MMP9的表达水平较Sham组显著提高,而OE处理下调两者表达(P0.01,P0.05)。结论:OE可能通过抑制炎性反应保护脑缺血再灌注损伤。     

Inhibition of classical complement activation attenuates liver ischaemia and reperfusion injury in a rat model

Activation of the complement system contributes to the pathogenesis of ischaemia/reperfusion (I/R) injury. We evaluated inhibition of the classical pathway of complement using C1-inhibitor (C1-inh) in a model of 70% partial liver I/R injury in male Wistar rats (n = 35). C1-inh was administered at 100, 200 or 400 IU/kg bodyweight, 5 min before 60 min ischaemia (pre-I) or 5 min before 24 h reperfusion (end-I). One hundred IU/kg bodyweight significantly reduced the increase of plasma levels of activated C4 as compared to albumin-treated control rats and attenuated the increase of alanine aminotransferase (ALT). These effects were not better with higher doses of C1-inh. Administration of C1-inh pre-I resulted in lower ALT levels and higher bile secretion after 24 h of reperfusion than administration at end-I. Immunohistochemical assessment indicated that activated C3, the membrane attack complex C5b9 and C-reactive protein (CRP) colocalized in hepatocytes within midzonal areas, suggesting CRP is a mediator of I/R-induced, classical complement activation in rats. Pre-ischaemic administration of C1-inh is an effective pharmacological intervention to protect against liver I/R injury.