Toll样受体4在大鼠心肌缺血再灌注损伤中表达的实验研究

目的 观察心肌缺血再灌注早期Toll样受体4 mRNA(TLR4 mRNA)及蛋白表达,探讨TLR4在心肌缺血再灌注损伤中的作用.方法 雄性SD大鼠随机分为2组:假手术组(Sham组)、缺血再灌注组(IR组),每组36只,建立大鼠心肌缺血再灌注模型,按照不同的再灌注时间(0、0.5、1、24和8 h)处死动物.光镜和电镜观察心肌组织形态及超微结构改变.免疫组化检测心肌TLR4蛋白表达情况.实时定量逆转录聚合酶链反应定量心肌TLR4 mRNA表达水平.酶联免疫吸附试验测定心肌中肿瘤坏死因子-α(TNF-α)含量.结果 (1)Sham组心肌组织形态及超微结构改变不明显;IR组心肌损伤较重,缺血心肌恢复血液灌注8 h内,其病理学变化未见显著改善.(2)Sham组与IR组TLR4蛋白都有阳性表达,IR组TLR4表达增加,且以再灌注1 h最为明显(19.62±3.84,P＜0.01).(3)与Sham组比较,IR组心肌,TLR4 mRNA表达水平均出现不同程度上调,以再灌注1 h达到峰值[(4.03±0.85)×10-2,P＜0.01],而Sham组各时间点未见明显改变.(4)IR组心肌TNF-α水平高于各对应时间点Sham组(P均＜0.05),且心肌TLR4 mRNA表达与TNF-α呈正相关(r=0.728,P＜0.01).结论 心肌缺血再灌注早期,心肌TLR4表达迅速上调,TLR4的激活可能通过促进TNF-α等炎性因子的产生分泌增多来介导心肌缺血再灌注损伤.     

下肢缺血预处理对大鼠心肌基因表达的影响

目的 通过观察经下肢缺血预处理的心肌梗死大鼠心肌中缺氧诱导因子-1α(HIF-1α)和血红素加氧酶-1(HO-1)mRNA的表达,探讨其在缺血心肌中的作用.方法 将SD雄性大鼠随机分为心肌梗死组(40只)和下肢缺血预处理组(40只);每组按缺血时间又分为1、2、4、6、12 h组.显微镜下计数外周血白细胞;HE染色观察心肌组织中浸润白细胞的数值.应用逆转录多聚酶链反应(RT-PCR)测定术后各时间点心肌组织中HIF-1α和HO-1mRNA表达.结果 下肢缺血预处理后12 h组外周血白细胞计数以及心肌组织中白细胞浸润数目较心梗组显著减少(P＜0.05);心肌中1、2、4 h HIF-1α mRNA表达与心梗组对应时间点比较有显著差异(P＜0.01).各时间点HO-1mRNA表达与心梗组对应时间点比较有显著差异(P＜0.01). 结论经下肢缺血预处理后,心肌损伤减轻,HIF-1α和HO-1可能与心肌保护作用有关.     

锌对缺血再灌注损伤家兔心肌金属硫蛋白-1基因表达的影响

目的研究锌对家兔心肌缺血再灌注损伤的保护作用。方法采用RT-PCR技术,检测分析金属硫蛋白-1(MT-1)基因在家兔缺血再灌注损伤心肌的表达及锌对其基因表达的调节。结果各组家兔心肌组织中均有MT-1基因的表达,缺血再灌注组MT-1基因的表达较正常对照组明显下降(P<0.01),补锌再灌注组MT-1基因的表达较缺血再灌注组明显上调(P<0.01)。结论锌对家兔心肌缺血再灌注损伤的分子机制中,调节其心肌组织中MT-1基因转录水平的表达可能是一条重要途径。     

葛根素对大鼠心肌缺血再灌注损伤的干预作用

目的 观察葛根素对大鼠心肌缺血再灌注损伤后炎症反应的抑制作用并探讨其作用机制.方法 36只SD大鼠随机分成假手术组、模型组和葛根素处理组;采用左冠状动脉结扎法复制大鼠心肌缺血再灌注损伤模型,于缺血开始及再灌注即刻由尾静脉注射葛根素20 mg/kg,缺血1 h,再灌注6 h后取血检测缺血再灌注后心肌髓过氧化物酶(MPO)、丙二醛(MDA)和血清磷酸肌酸激酶(CK)含量,RT-PCR测定缺血再灌注后心肌胞间黏附分子-1(ICAM-1) mRNA含量.结果 葛根素组血清CK明显低于模型组(P<0.01),MPO和MDA的活性明显低于模型组(P<0.01),ICAM-1 mRNA含量较模型组低(P<0.01).结论 葛根素可减轻大鼠心肌缺血再灌注损伤后炎症反应,这可能是其发挥心肌保护机制之一.     

腺苷对大鼠缺血再灌注心肌IGF-1蛋白的影响

目的 观察腺苷对大鼠缺血再灌注心肌细胞凋亡与胰岛素样生长因子-1(IGF-1)蛋白的关系.方法 取Wistar大鼠24只,随机分成3组,随机分为假手术组(iv组)、缺血再灌注模型组(1/R组)、缺血再灌注后腺苷处理组(AD组),每组8只.通过结扎大鼠左冠状动脉前降支(LAD) 30 min和灌注2h造成心肌缺血再灌注损伤.采用TUNEL法观察心肌细胞凋亡;利用免疫组化法检测IGF -1蛋白的表达.结果 I/R组心肌细胞凋亡指数和IGF-1蛋白表达较iv组升高(P＜0.05);与I/R组相比,AD组心肌细胞凋亡指教明显降低,而IGF-1蛋白表达明显升高(P＜0.05).结论 腺苷可抑制心肌细胞凋亡,明显提高IGF -1蛋白表达水平,对缺血再灌注损伤心肌有保护作用.提示腺苷可减轻心肌缺血再灌注损伤,作用机制与提高IGF-1蛋白表达水平和抗心肌细胞凋亡作用有关.     

多胺代谢与大鼠心肌缺血再灌注损伤关系的实验研究

目的 观察缺血再灌注不同时期大鼠心肌多胺代谢变化规律,探讨多胺代谢与心肌缺血再灌注损伤的关系.方法 采用结扎冠状动脉方法复制大鼠在体心肌缺血再灌注损伤模型,应用逆转录聚合酶链反应(RT-PCR)、Western免疫印迹(Western blot)方法分别测定正常、缺血再灌注2 h、6 h、12 h和24 h时心肌鸟氨酸脱羧酶(ODC)和精胺/精脒乙酰转移酶(SSAT)mRNA的转录和蛋白表达水平,并用高效液相色谱仪测定多胺含量变化.结果 心肌缺血再灌注后ODC和SSAT mRNA的转录和蛋白表达均上调,至再灌注24 h时,与假手术组比,ODC mRNA和SSAT mRNA转录分别增加了3.1倍和3.8倍(P＜0.01),ODC和SSAT的蛋白表达分别增加了3.1倍和2.9倍(P＜0.01).精胺、精脒和多胺总代谢池含量减少,至再灌注24 h时,分别比假手术组少了33.6%、35.3%和32.9%,而腐胺多了58.9%(P＜0.01).结论 心肌缺血再灌注损伤可导致多胺代谢失衡,二者密切相关.     

川芎嗪减轻大鼠心肌缺血再灌注损伤炎症反应及机制

目的观察川芎嗪预处理对大鼠心肌缺血再灌注损伤炎症反应的影响并探讨其可能的机制。方法 48只雄性SD大鼠随机分为假手术组、缺血再灌注组、川芎嗪组、左旋-硝基-精氨酸甲酯组以及川芎嗪+左旋-硝基-精氨酸甲酯组,假手术组左前降支近端穿线但不结扎,其余四组给予结扎前降支缺血35 min,再灌注120 min。光镜观察大鼠心肌组织结构变化,测定缺血心肌组织超氧化物歧化酶活性和丙二醛含量及髓过氧化物酶、白细胞介素1β、一氧化氮含量,逆转录聚合酶链反应和免疫印迹法测定心肌内皮型一氧化氮合酶mRNA和蛋白的表达水平。结果与缺血再灌注组相比,川芎嗪预处理能减少心肌白细胞浸润,增加心肌组织超氧化物歧化酶活性,降低丙二醛含量及髓过氧化物酶活性,降低白细胞介素1β水平,增加一氧化氮含量及心肌内皮型一氧化氮合酶mRNA和蛋白的表达水平,左旋-硝基-精氨酸甲酯显著抑制上述指标的变化并取消了川芎嗪所致的内皮型一氧化氮合酶mRNA和蛋白表达水平的增加。结论川芎嗪预处理能减少大鼠心肌缺血再灌注损伤的炎症反应,其机制可能与上调内皮型一氧化氮合酶表达,增加内源性一氧化氮水平有关。     

甲基泼尼松龙在大鼠局灶性脑缺血再灌注损伤中的保护作用

目的 探讨甲基泼尼松龙(methylprednisolone,MP)对大鼠局灶性脑缺血再灌注损伤中脑神经元细胞凋亡的影响,并探讨其可能的机制. 方法 SD雄性大鼠84只,随机分为假手术组(Sham组)、缺血再灌注组(I/R组)、MP组,制造大脑中动脉阻塞模型,缺血2 h后再灌注3、6、12、24 h.MP组于再灌注时腹腔注射MP 30 mg/kg.光镜和电镜下观察脑组织神经细胞形态学变化,免疫组化法检测半胱氨酸天冬氨酸蛋白酶-3(caspase-3), 血红素氧合酶-1(HO-1)的蛋白表达,流式细胞仪Annexin-V-PI双染法测定神经细胞凋亡率. 结果 I/R组与Sham组相比,脑组织细胞凋亡率显著增加(P＜0.01),caspase-3,HO-1蛋白表达明显上升(P＜0.05或P＜0.01);MP组与I/R组相比,神经细胞凋亡率显著减少(P＜0.01),caspase-3的表达明显降低(P＜0.01),HO-1表达显著增加(P＜0.01).细胞病理形态改变在24 h最严重,经MP处理后损伤明显减轻. 结论 MP可能通过诱导缺血再灌注损伤后脑组织细胞中HO-1的高表达,从而抑制细胞凋亡来减轻脑缺血再灌注损伤.     

PRE-084预处理对缺血再灌注损伤大鼠心肌细胞凋亡的影响

目的观察Sigma-1受体激动剂PRE-084对心肌缺血再灌注损伤大鼠心肌细胞凋亡的影响。方法将15只SD雄性大鼠随机分为假手术组、缺血再灌注组、PRE-084组,每组5只。PRE-084组手术前1 h给予1 mg/kg PRE-084,假手术组和缺血再灌注组给予等体积的生理盐水,结扎前降支半小时再灌注24 h。应用末端脱氧核苷酸转移酶介导的dUTP缺口末端标记测定法(TUNEL)检测心肌凋亡指数,反转录聚合酶链反应(RT-PCR)检测Sigma-1受体、Bcl-2、Bax mRNA表达情况。结果与缺血再灌注组比较,PRE-084组凋亡指数下降,Sigma-1受体、Bcl-2 mRNA上升,Bax mRNA表达下降,差异均有统计学意义(P<0.01)。结论PRE-084预处理可减少大鼠心肌缺血再灌注损伤引起的细胞凋亡,其机制可能为通过Sigma-1受体增加Bcl-2表达、降低Bax表达。     

老年大鼠沉默信息调节因子相关酶1的变化及其与心肌缺血预处理“失效”的关系

目的 通过观察成年和老年大鼠内源性及心肌缺血预处理沉默信息调节因子1(SIRT1)的差异,在与寿命相关的SIRT1蛋白水平揭示缺血预处理在老年大鼠中效果较成年大鼠差的可能原因.方法 雄性SD大鼠60只,成年和老年各30只,其中成年大鼠200～ 250 g,老年大鼠450～ 600 g(18月龄).两个年龄组分别采用随机数字表法随机分为3组(n=10),假手术(S组),缺血再灌注组(IR组),缺血预处理组(IPC组).通过结扎及松开冠状动脉左前降支建立在体大鼠缺血预处理及缺血再灌注模型,分别于缺血前及再灌注120 min监测血流动力学;分光光度法测定心肌组织中乳酸脱氢酶(LDH)含量、肌酸激酶同工酶(CK-MB)含量;ELISA法检测心肌组织SIRT1活性;RT-PCR法检测心肌组织中SIRT1蛋白mRNA;Western蛋白印迹检测SIRT1蛋白含量.结果 老年大鼠SIRT1蛋白基础水平较成年大鼠降低,SIRT1基础活性亦较成年大鼠下降(P＜0.05).缺血预处理时老年大鼠SIRT1含量较成年大鼠显著降低,SIRT1活性显著降低(P＜0.05).老年大鼠缺血预处理与老年大鼠缺血再灌注相比,SIRT1含量与活性均无显著改变(P＜0.05).成年大鼠缺血预处理与成年大鼠缺血再灌注相比,SIRT1含量与活性均显著升高.结论 SIRT1含量及活性随年龄增加而降低是缺血预处理在老年大鼠中丧失保护作用的原因.     

促红细胞生成素对大鼠心肌缺血再灌注损伤的影响

目的:观察促红细胞生成素(erythropoietin,EPO)对大鼠心肌缺血再灌损伤的影响,并探讨机制.方法:以左冠状动脉前降支(LAD)穿线结扎法制备心肌缺血模型,松开结扎线造成再灌注.45只SD大鼠随机分成5组:①假手术组,②缺血再灌注组,③磷脂酰肌醇-3-激酶(PI3K)的高选择性阻断剂LY294002组,④EPO 组和⑤EPO+LY294002组.观察心电图Ⅱ导联心律失常发生情况,进行室性心律失常评分;电镜观察心肌细胞超微结构;以TUNEL法检测细胞凋亡;检测血清肌酸磷酸激酶同工酶(CK-MB)和肌钙蛋白I(cTnI)水平.结果:EPO能降低心律失常评分(P<0.01),减轻心肌细胞超微结构损伤,减少细胞凋亡(P<0.01),降低血清CK-MB和cTnI水平(P<0.01),但这些作用可被预先给予的LY294002所减弱.结论:EPO能减轻心肌缺血再灌注损伤, PI3K参与其信号转导.     

促肝细胞生长素对肾缺血再灌注大鼠肺组织细胞凋亡的作用

目的 探讨大鼠肾缺血再灌注后肺损伤及细胞凋亡的变化,并观察促肝细胞生长素(hepatocyte growth-promoting factor,pHGF)对其影响.方法 雄性Sprague-Dawley大鼠32只,随机分为假手术对照组(Ⅰ组)、缺血再灌注组(Ⅱ组)、缺血再灌注前pHGF干预组(Ⅲ组)和缺血再灌注后pHGF干预组(Ⅳ组).用无损伤动脉夹钳夹大鼠双侧肾蒂45 min制成肾缺血再灌注损伤模型.Ⅰ组只暴露双肾,不钳夹肾蒂.Ⅲ组和Ⅳ组分别在术前和术后腹腔注射pHGF 50 mg/kg.检测术后12 h血清白介素1β(interleukin-1β,IL-1β)和血肌酐(serum creatinine,Scr)的浓度及肺组织干/湿重比变化,病理切片观察肺组织病理学及细胞凋亡的改变.结果 与Ⅰ组比较,Ⅱ组血清IL-1β、Scr水平及肺组织细胞凋亡阳性细胞数均显著升高(P值均＜0.01),Ⅲ组和Ⅳ组各项数值均较Ⅱ组降低(P值均＜0.01).1I组肺组织干/湿重比较Ⅰ组明显降低(P＜0.01),Ⅲ组和Ⅳ组均较Ⅱ组上升(P值均＜0.01).缺血再灌注12 h肺组织病理改变严重,有明显肺泡内和肺间质水肿及炎症细胞的浸润;pHGF干预后,肺组织形态学改变明显减轻.各项指标在Ⅲ组和Ⅳ组之间的差异无统计学意义.结论 肾缺血再灌注后释放的细胞因子IL-1β可致肺组织细胞凋亡及损伤,pHGF对其既有保护作用又有治疗作用.     

血红素氧合酶对大鼠肝脏缺血再灌注损伤细胞凋亡及相关基因的影响

目的通过应用血红素氧合酶（HO）的诱导剂氯高血红素和抑制剂锌原卟啉（ZnPP），探讨HO对大鼠肝脏缺血再灌注（IR）细胞凋亡及其相关基因的影响。方法将96只Sprague—Dawley大鼠采用钳夹法制备肝脏IR模型，随机分为假手术组、IR组、氯高血红素组和ZnPP组，检测再灌注0、1．5、4h和8h各个时间点大鼠肝脏功能以及病理学改变，流式细胞法测定肝细胞凋亡率、TUNEL法观察再灌注后4h大鼠肝细胞的凋亡情况，Western blot法检测再灌注后8h Bcl-2和Caspase-3的表达。结果在IR组各时间点均可见ALT和AST增高，病理学检查可见肝细胞肿胀，肝窦变窄，嗜中性粒细胞浸润和片状坏死等变化，肝组织中细胞凋亡率明显升高，Bcl-2的表达减少，而Caspase-3的表达增加。在氯高血红素组再灌注后1．5、4h和8h ALT和AST值明显降低，肝脏病理学改善，凋亡细胞减少及细胞凋亡率降低，肝脏Bcl-2的表达增加，Caspase-3的表达减少。ZnPP组则显示与之相反的结果。结论HO在肝脏IR损伤中具有保护作用，这种保护作用可能与抑制细胞凋亡有关。     

The protective effect of erythropoietin on ischaemia/reperfusion injury of liver

BackgroundBesides its haematopoietic effect, erythropoietin (EPO) has multiple protective effects, i.e. antiapoptotic, antioxidant and angiogenic properties. The neuroprotective effects of EPO against ischaemia have all been demonstrated in cell culture and animal models. The aim of the study was to evaluate the effect of erythropoietin on ischaemia-reperfusion injury (I/R injury) of the liver.MethodsForty-eight adult male Sprague-Dawley rats weighing 250–300 g were divided into three groups: group I, hepatic ischaemia-reperfusion (Hepatic I/R); group II, hepatic ischaemia-reperfusion + EPO (Hepatic I/R+ EPO); group III, sham. Hepatic ischaemia was created by placing a microvascular clamp on the hepatic pedicle for 45 minutes. EPO was given to group II at a dose of 1000 U/kg 120 minutes before the onset of the ischaemia. Blood samples and liver tissues were obtained after 45 minutes of reperfusion from half of the rats in each group. The remaining rats were killed after a 24-hour observation period and blood and tissue samples were obtained. Blood alanine aminotransferase, tumour necrosis factor-α (TNF-α), interleukin-2 (IL-2) and liver tissue malondialdehyde (MDA) levels were determined. Liver tissue histopathology was also evaluated by light microscopy.ResultsIn rats with hepatic ischaemia, serum levels of ALT, TNF-α, IL-2 and liver tissue levels of MDA were reduced by the administration of erythropoietin and the histopathological score was also less severe.ConclusionThis study demonstrates that pre-ischaemic administration of EPO has protective effects on hepatic I/R injury.     

Protective effects of chronic melatonin treatment against renal ischemia/reperfusion injury in streptozotocin-induced diabetic rats.

AIMS: The purpose of this study was to investigate the effects of chronic administration of melatonin on renal ischemia/reperfusion (IR) injury in streptozotocin (STZ)-induced diabetic rats. METHODOLOGY: Male Sprague-Dawley rats were divided into six groups: control (C), diabetes mellitus (DM), control+IR (C+IR), DM+IR, Melatonin+IR (Mel+IR), DM+Mel+IR. Diabetic and non-diabetic rats were given melatonin 4 mg/kg/day, i.p., for 15 days. The left renal artery and vein of rats were occluded for 30 min at the 18th day, followed by 24 h of reperfusion. RESULTS: In comparison with control group, the levels of malondialdehyde (MDA), protein carbonyl (PC) and and nitric oxide (NO) were determined to be higher in the renal homogenates of DM, DM+IR and C+IR groups. MDA and NO levels were found to be similar in the DM+melatonin+IR and control groups. The most significant histological damage was found in the DM+IR group and this damage was significantly reduced by melatonin. CONCLUSION: Chronic melatonin treatment reduces renal injury by reducing lipid oxidation and NO production in STZ-induced diabetic rats exposed to IR.     

The protective effect of adrenomedullin on renal injury, in a model of abdominal aorta cross-clamping

Renal injury induced by aortic ischemia-reperfusion (IR) is an important factor in the development of postoperative acute renal failure following abdominal aortic surgery. The aim of this study was to examine the effect of adrenomedullin (AM) on kidney injury induced by infrarenal abdominal aortic IR in rats. Thirty-two Wistar Albino rats were randomized into four groups (eight per group) as follows: Control group, IR group (120-minute ischemia and 120-minute reperfusion), IR?+?AM group (a bolus intravenously of 0.05 μg/kg/min AM), and control?+?AM group. At the end of the experiment, blood and kidney tissue specimens were obtained for biochemical analysis. Immunohistological evaluation of the rat kidney tissues was also done. IR significantly increased (p?相似文献   

Protective effects of ischemic preconditioning on the intestinal mucosal microcirculation following ischemia-reperfusion of the intestine

Objective: The small bowel villi are extremely sensitive to ischemia–reperfusion (IR) injury and a range of microcirculatory disturbances contribute to structural and functional changes. The aim of this study was to determine the protective effects of ischemic preconditioning (IPC) of the intestine on the mucosal villous microcirculation during IR injury of the intestine and whether heme oxygenase (HO) is involved in the protection. Methods: Rats were allocated into 4 groups: ( 1 ) sham, ( 2 ) IR consisting of 30 min of ischemia followed by 2 h of reperfusion, ( 3 ) IPC, as in IR group, but preceded by 10 min of ischemia and 10 min of reperfusion, and ( 4 ) with administration of zinc protoporphyrin, an HO inhibitor before IPC and IR. The mucosa of an exteriorized segment of ileum was visualized. Mucosal perfusion index (MPI), red blood cell (RBC) velocity and leukocyte–endothelial interactions during reperfusion were assessed continuously using in vivo fluorescence microscopy. HO activity in the ileum was assessed at the end of the reperfusion period. Results: IPC improved the MPI by 26% and the RBC velocity by 29% on comparison to IR. IR led to a 52% increase in leukocyte–endothelial interactions on comparison to IPC. The administration of zinc protoporphyrin reversed the beneficial effects of IPC. There was a two fold increase of HO activity in IPC compared to IR, whereas zinc protoporphyrin significantly reduced the HO activity. Conclusions: IPC conferred a protective effect on the villous microcirculation possibly via HO and might prove to be an effective strategy for the amelioration of IR injury.     

薯蓣皂甙对大鼠心肌缺血再灌注损伤的保护作用

目的观察薯蓣皂甙对大鼠心肌缺血再灌注(IR)损伤的保护作用。方法健康雄性Wistar大鼠48只,随机分为IR组、高剂量组(DH)、低剂量组(DL)。IR组0.9%生理盐水10m.lkg-1.d-1灌胃,高剂量组薯蓣皂甙300mg·kg-1.d-1灌胃,低剂量组150mg·kg-1.d-1灌胃,共7d。末次给药24h后,复制大鼠心肌IR损伤模型,观察心脏生理学指标(HR、BP、ST段变化),心律失常评分,心肌梗死面积,心肌形态学指标的变化。结果与IR组心律失常评分3.75±0.45相比,给药组(DH组2.25±1.18,DL组2.44±1.09)明显下降,心肌梗死面积明显缩小,心功能明显改善。结论薯蓣皂甙对大鼠心肌IR损伤具有保护作用。     

培哚普利对心肌缺血再灌注损伤早期Toll样受体4表达的影响

目的观察培哚普利对缺血再灌注早期Toll样受体4蛋白（TLR4）的影响,初步探讨其对心肌缺血再灌注损伤的保护机制。方法30只Wistar大鼠随机分为假手术组、缺血再灌注组及培哚普利组。培哚普利组灌服培哚普利4mg／kg,每日1次,共7d。结扎大鼠左冠状动脉前降支（LAD）,建立大鼠缺血再灌注模型,光镜观察心肌形态学改变,TUNEI,法检测细胞凋亡数及免疫组化检测心肌组织中TLR4表达情况。结果与缺血再灌注组相比,培哚普利组炎症损伤减轻;培哚普利组心肌细胞凋亡数明显低于缺血再灌注组,但高于假手术组（P〈0．05）;培哚普利组心肌组织TLR4表达低于缺血再灌注组,但高于假手术组（P〈0．05）。结论培哚普利可减轻心肌缺血再灌注早期的细胞凋亡,其机制之一可能是通过抑制TLR4所介导的炎症反应实现的。     

银杏叶提取物保护胰腺缺血再灌注损伤作用的机制探讨

目的探讨银杏叶提取物(EGb)对大鼠胰腺缺血/再灌注(IR)损伤的保护作用及其机制。方法制备大鼠胰腺IR损伤模型。取SD大鼠24只,随机分为3组(n=8)假手术组(Sham组)、IR组、缺血/再灌注银杏叶提取物保护组(EGb IR组)。光镜、电镜观察胰腺腺泡细胞结构改变;采用TUNEL方法检测细胞凋亡;流式细胞仪定量检测细胞凋亡;应用免疫组化染色检测Bcl-2、Bax蛋白表达。结果IR组凋亡指数明显大于Sham组(P<0.01),EGb IR组凋亡指数明显小于IR组(P<0.01);EGb IR组Bcl-2蛋白表达明显高于IR组(P<0.01);EGb IR组Bax蛋白表达明显低于IR组(P<0.01)。结论银杏叶提取物可能通过上调Bcl-2蛋白表达,下调Bax蛋白表达,对大鼠胰腺IR损伤起保护作用。