大蒜素对大鼠脊髓缺血再灌注损伤的保护作用

目的 研究大蒜素（allicin）在脊髓缺血再灌注损伤中的保护作用及其相关机制.方法 实验前1 w实验用SD大鼠预先给予不同浓度大蒜素腹腔注射,每天一次持续7d,采用肾下腹主动脉阻断法建立脊髓缺血再灌注损伤模型.损伤后24 h通过测定脊髓组织含水量、梗死体积和正常神经元计数评价大鼠脊髓组织损伤程度.采用（Basso-Beattie-Bresnahan,BBB）评分标准对大鼠进行后肢功能评分以反映损伤后运动功能.损伤后4h和24 h检测线粒体膜电位、活性氧自由基（ROS）含量和线粒体ATP的变化,讨论大蒜素保护作用与线粒体信号通路的关系.结果 大蒜素能减轻脊髓缺血再灌注损伤,促进运动功能恢复,抑制线粒体功能障碍.结论 大蒜素通过保护线粒体功能发挥对脊髓缺血再灌注损伤的保护作用.     

缺血后处理对大鼠脑缺血再灌注损伤神经保护作用的研究

目的探讨大鼠脑缺血后处理对缺血再灌注损伤后神经元的保护作用。方法健康雄性SD大鼠30只,随机分为假手术组(SO组)、缺血再灌注对照组(MCAO组)、缺血后处理组(IPOC组)3组。采用线栓法制备大鼠MCAO模型及IPOC模型,分别用TTC染色法计算脑梗死体积、流式细胞术和ELISA法观察,对于大鼠缺血半暗带神经细胞凋亡率及血清神经元特异性烯醇化酶(NSE)含量的影响。结果 (1)大鼠脑缺血再灌注后24h,IPOC组较MCAO组梗死体积明显减小(P<0.05);(2)MCAO组大鼠脑缺血再灌注24h细胞凋亡发生率及血清中NSE的含量较SO组显著增加(P<0.01);(3)IPOC组神经元凋亡发生率及血清NSE较MCAO组显著降低(P<0.05或0.01)。结论大鼠脑缺血后处理对缺血再灌注神经元损伤有保护作用。     

白藜芦醇对大鼠缺血再灌注损伤后脑组织的保护作用

目的探讨白藜芦醇对大鼠缺血再灌注损伤后脑组织的保护作用及其机制。方法利用线栓法制作大鼠脑缺血再灌注损伤模型。72只SD大鼠按随机数字表法随机平均分为假手术组、对照组、白藜芦醇高剂量组和白藜芦醇低剂量组。缺血2h再灌注24h后,分别测定动物的神经损伤功能评分、脑组织梗死体积,缺血再灌注损伤的脑组织中髓过氧化物酶(MPO)的活性、伊文思兰的含量、肿瘤坏死因子-α(TNF-α)的含量及基质金属蛋白酶-9(MMP-9)的表达水平。结果白藜芦醇治疗组神经功能损伤评分均较对照组明显降低(P<0.05),脑梗死体积明显缩小(P<0.05),MPO的活性、伊文思兰的含量、TNF-α的含量及MMP-9表达水平均也明显低于对照组(P<0.05)。结论白藜芦醇可能通过降低炎症反应和血脑屏障通透性对大鼠脑缺血再灌注损伤的脑组织起神经保护作用;其抗炎作用可能与其降低TNF-α的含量有关,而降低血脑屏障通透性则可能与MMP-9的表达下调有关。     

脑缺血预处理对缺血再灌注损伤的保护作用

目的　观察缺血预处理对脑缺血再灌注损伤的保护作用。方法　采用四血管阻断法对实验鼠分组进行全脑缺血预处理及缺血后再灌注, 半定量法观察海马区神经元受损情况。结果　实验组四血管阻断３ 分钟（ 预处理） 后海马区神经元受损与对照组无显著差异;３ 天间隔６ 分钟全脑缺血再灌注组神经元受损较其他组明显减轻。结论　缺血预处理对脑缺血再灌注损伤保护作用与全脑缺血预处理时间, 后续全脑缺血再灌注损伤时间及两者间的时间间隔有关。     

iNOS抑制剂对海马缺血/再灌注损伤保护作用研究

目的：进一步证实诱导型一氧化氮合酶（ｉＮＯＳ）催化所形成的一氧化氮（ＮＯ）在脑缺血／再灌注损伤中具有毒性作用。方法：将Ｓ－Ｄ大鼠双侧颈总动脉短暂夹闭３分钟,然后分成应用药物组－氨基胍（ＡＧ）和非药物组．４８小时后取海马脑片,观察顺向群峰电位（ｏＰＳ）以及组织学改变。结果;给药组大部分可见ｏＰＳ发放．而对照组只见有突触前排放（ｐｖ）无ｏＰＳ（Ｐ＜０．０５）,两组超微结构也有明显差异。结论：本实验证明大鼠海马短暂缺血／再灌注后ｉＮＯＳ抑制剂可减轻神经元损害,即可抑制血由ｉＮＯＳ诱生表达所形成的ＮＯ在脑缺血／再灌注损伤中的毒性作用。     

白藜芦醇对大鼠脊髓缺血再灌注损伤组织的保护作用

脊髓组织发生缺血,经处理恢复血流后损伤反而加重的现象称为脊髓缺血再灌注损伤,可能与血流恢复后脊髓组织的氧自由基过剩、细胞凋亡加重等有关［1］。本研究探讨脊髓缺血再灌注损伤的发病机制及防治途径,采用大鼠脊髓缺血再灌注损伤模型观察白藜芦醇造模前给药的效果。     

落新妇甙对肝缺血再灌注损伤的保护作用

背景：肝脏是对缺血再灌注损伤最敏感的器官之一。黄酮类化合物落新妇甙可作为递氢体清除氧自由基,从而可能在减轻肝脏缺血再灌注损伤等方面发挥作用。 目的：观察落新妇甙对肝脏热缺血再灌注损伤的保护作用,对其机制进行初步探讨。 方法：C57BL/6小鼠随机分为4组：假手术组、模型组、小剂量干预组和大剂量干预组。干预组小鼠于缺血前24 h和1 h分别给予10或40 mg/kg的落新妇甙腹腔注射,然后建立70%部分肝缺血再灌注模型。采集血液和肝脏组织样本。检测血清丙氨酸氨基转移酶活性,ELISA测血清肿瘤坏死因子α水平,化学比色法测定肝组织中超氧化物歧化酶、丙二醛含量。肝脏组织病理学检测。Westernblot检测肝组织中肿瘤坏死因子α蛋白含量,RT-PCR检测肿瘤坏死因子α mRNA。 结果与结论：落新妇甙干预能有效降低血清丙氨酸氨基转移酶水平,干预组肝组织丙二醛含量较模型对照组明显下降(P < 0.01);而超氧化物歧化酶含量明显上升(P < 0.01);干预组血清肿瘤坏死因子α含量较模型组对照组明显下降(P < 0.01);小、大剂量干预组肝组织中肿瘤坏死因子α蛋白表达与模型组模型对照组比较渐次降低,与半定量RT-PCR结果相符(小剂量干预组P < 0.05,大剂量干预组P < 0.01)。落新妇甙保护肝脏热缺血再灌注损伤显示出剂量-效应关系趋势。结果提示,落新妇甙干预能减轻小鼠肝脏热缺血再灌注损伤后的炎症反应和脂质过氧化损伤,有效改善肝功能和肝脏病理损害;机制可能在于其能抑制缺血再灌注损伤肝组织中肿瘤坏死因子α的高表达。     

西洛他唑对大鼠脑微血管内皮细胞缺血再灌注损伤的保护作用

目的研究西洛他唑对大鼠脑微血管内皮细胞缺血再灌注损伤的保护作用机制。方法以原代方法培养大鼠脑微血管内皮细胞并传代,将第3代传代细胞随机分为正常对照组、西洛他唑组、溶剂对照组和缺血再灌注模型组(再灌模型组)4组,对后3组大鼠建立脑微血管内皮细胞糖氧剥夺后复糖氧模型,模拟缺血再灌注过程,并对西洛他唑组和溶剂对照组在造模同时分别以终浓度1×10-5mmol/L西洛他唑〔二甲基亚砜(DMSO)为溶剂〕和0.05%(体积分数)DMSO进行干预。糖氧剥夺3 h复糖氧24 h后,测定各组细胞上清液中诱导型一氧化氮合酶(iNOS)和内皮型一氧化氮合酶(eNOS)水平及细胞内环磷腺苷酸(cAMP)水平,并以四唑盐(MTT)比色实验测定细胞活力。结果西洛他唑组与再灌模型组比较,eNOS水平明显提高,iNOS水平明显降低,cAMP水平及细胞存活率显著提高(均P<0.05)。结论西洛他唑对大鼠脑微血管内皮细胞的缺血再灌注损伤有保护作用,其作用机制可能与促进eNOS水平升高和iNOS水平降低有关。     

低分子肝素对大鼠大脑皮层神经细胞缺血再灌注损伤的保护作用

目的研究低分子肝素(low molecular weight heparin,LMWH)对大鼠大脑皮层神经细胞缺血再灌注损伤的保护作用及其可能机制。方法体外培养新生大鼠大脑皮层神经细胞,建立缺血再灌注模型,MTT法检测细胞活力,Annexin V-FITC、PI双染流式测细胞凋亡率,荧光分光光度计法测定细胞内钙离子浓度。结果低分子肝素可提高缺血再灌注损伤的神经细胞活力,降低细胞凋亡率和细胞内钙离子浓度。结论低分子肝素对缺血再灌注损伤的大鼠大脑皮层神经细胞有保护作用,其机制可能与LMWH降低细胞内钙离子浓度有关。     

缺血后处理通过水通道蛋白-4对大鼠缺血再灌注损伤的脑保护作用及其机制

目的研究缺血后处理(IP)对大鼠脑缺血再灌注损伤的保护作用,探讨各组大鼠水通道蛋白-4(AQP4)的表达。方法实验分组:48只雄性SD大鼠,随机分为3组(n=16)。假手术组;对照组:行单纯缺血再灌注;缺血后处理组:IP组。采用线栓法阻断大脑中动脉制备大鼠局灶性脑缺血再灌注模型。大鼠脑缺血再灌注后24 h进行神经行为学评分和脑梗死体积测定,干湿重法测定脑水含量。并行免疫组织化学方法检测海马CA_1区细胞凋亡及AQP4表达的变化并行统计学分析。结果与对照组比较,IP组神经行为学评分明显降低,脑梗死体积、脑组织中的水分含量明显减少(P 0. 05)。再灌注24 h后,对照组海马CA_1区AQP4、凋亡细胞24 h表达量明显增加,IP组与对照组之间比较有差异(P 0. 05)。结论 IP组脑神经行为学评分、脑含水量、脑梗死体积均明显降低,提示缺血后处理可通过抑制AQP4的表达减轻缺血再灌注损伤后的脑水肿,起到脑保护作用。     

Protective effects of acupuncture on brain tissue following ischemia/reperfusion injury★

BACKGROUND： In patients with cerebrovascular disease, by means of the neuroendocrine system, acupuncture supports the transformation of a local pathological status into a physiological status. Recently, great progress has been made in studying the protective effects of acupuncture on brain ischemia/reperfusion injury. OBJECTIVE： To summarize research advances in the protective effects of acupuncture on brain ischemia/reperfusion injury. RETRIEVAL STRATEGY： Using the terms ＂acupuncture, transcutaneous electrical acupoint stimulation, cerebral ischemia/reperfusion injury, and cerebral protection＂, we retrieved articles from the PubMed database published between January 1991 and June 1994. Meanwhile, we searched the China National Knowledge Infrastructure with the same terms. Altogether, 114 articles and their results were analyzed. Inclusive criteria： studies that were closely related to the protective effects of acupuncture on brain ischemia/reperfusion injury, or studies, whose contents were in the same study field and were published recently, or in the authorized journals. Exclusive criteria： repetitive studies. LITERATURE EVALUATION： Thirty articles that related to the protective effects of acupuncture on brain ischemia/reperfusion injury were included. Among them, 7 were clinical studies, and the remaining 23 articles were animal experimental studies. DATA SYNTHESIS： ① Animal experimental studies have demonstrated that acupuncture improves brain blood perfusion and brain electrical activity, influences pathomorphological and ultramicrostructural changes in ischemic brain tissue, is beneficial in maintaining the stability of intracellular and extracellular ions, resists free radical injury and lipid peroxidation, and influences cytokine, neurotransmitter, brain cell signal transduction, and apoptosis-regulating genes. ② Clinical studies have demonstrated that acupuncture not only promotes nutritional supply to local brain tissue in patients with cerebral infarction, but also increases brai     

KATP开放剂对大鼠局灶性脑缺血再灌注损伤的保护作用及其机制

目的观察ATP敏感性钾通道（KATP）开放剂尼可地尔（nicorandil）对大鼠脑缺血／再灌注（I／R）损伤的保护作用及其机制。方法将60只雄性Wistar大鼠随机分为4组：A组（假手术组）、B组（脑缺血再灌注组）、C组（脑缺血再灌注＋尼可地尔组）及D组（脑缺血再灌注＋尼可地尔＋5-HD组），采用线栓法建立大鼠大脑中动脉闭塞（MCAO）模型，各组于脑缺血2h后进行再灌注，再灌注22h后观察各组大鼠神经功能评分、脑梗死体积、线粒体标志酶活性和脂质过氧化降解产物丙二醛（malondialdehyde，MDA）的含量。结果（1）B、C、D组再灌注22h后神经功能评分显著低于A组，脑梗死体积、脂质过氧化物MDA含量均显著高于A组，线粒体标志酶活性SDH、CO表达显著低于A组（P〈0.01）；（2）与B、D组比较，C组神经功能评分明显升高，脑梗死体积、MDA含量明显减少，SDH、CO活性明显增高（P〈0.01）；（3）B组和D组各指标之间比较差异均无显著性（P〉0.05）。结论尼可地尔对大鼠脑缺血再灌注损伤具有保护作用，其机制可能与开放mitoKATP通道、维护线粒体功能、减少氧自由基产生有关。     

黄芪注射液对大鼠脑缺血再灌注损伤的保护作用研究

目的 探讨黄芪注射液对大鼠脑缺血/再灌注损伤的保护作用和机制.方法 应用线栓法经左侧颈外-颈内动脉插线建立大鼠大脑中动脉阻塞再灌注（MCAO/R）模型,经腹腔注射黄芪注射液（3 ml/kg）干预治疗.Longa法评价大鼠神经行为功能,氯化三苯基四氮唑（TTC）染色观察脑梗死体积,苏木精-伊红（HE）染色观察海马神经元形态结构,TUNEL法检测细胞凋亡,免疫组化检测c-jun氨基末端激酶（JNK3）蛋白表达水平.结果 经黄芪注射液治疗后大鼠海马神经元JNK3蛋白表达水平显著降低,凋亡细胞数量显著减少,神经元形态恢复,脑梗死体积缩小,大鼠神经行为功能显著改善.结论 黄芪注射液可通过下调JNK3表达水平而抑制细胞凋亡,缩小脑梗死体积,改善大鼠神经行为功能.     

丁苯酞预处理对大鼠脑缺血再灌注损伤的神经保护作用

目的研究丁苯酞预处理对大鼠局灶性脑缺血再灌注损伤的神经保护作用。方法健康成年SD雄性大鼠48只,随机分为假手术组、缺血再灌注组、丁苯酞预处理组,每组各16只。各组均灌胃5d后,采用线栓法制作大鼠局灶性脑缺血再灌注(MCAO)模型,缺血2h、再灌注24h,进行神经功能缺损评分,TTC染色及图像分析观察脑梗死体积,免疫组化法检测脑组织caspase-3、bcl-2表达的变化。结果与缺血再灌注组相比,丁苯酞预处理组神经缺损程度改善,梗死灶体积减少,caspase-3阳性细胞数量减少,bcl-2表达上调。结论丁苯酞可减轻缺血性脑血管病的发作,具有一定的神经保护作用。     

促红细胞生成素在脑缺血再灌注损伤中对线粒体的保护作用

目的 探讨促红细胞生成素(EPO)在脑缺血再灌注损伤中对线粒体功能的保护作用. 方法 30只SD大鼠按随机数字表法分为正常对照组、缺血再灌注组和EPO治疗组3组,每组各10只.EPO治疗组和缺血再灌注组用线栓法复制脑缺血再灌注模型.EPO治疗组在缺血再灌注后1、24、48、60 h腹腔注射EPO,剂量为3000 U/kg(用生理盐水以1:1比例稀释),缺血再灌注组腹腔注射同等剂量的生理盐水.正常对照组仅分离颈部动脉,动脉不做栓塞处理.缺血后72h观察各组大鼠脑组织神经细胞线粒体跨膜电位、线粒体丙二醛、超氧化物歧化酶、Na十_K+.ATP酶活性、一氧化氮含量和免疫组化检测海马区Caspase-3阳性细胞数的变化. 结果 EPO治疗组的神经细胞线粒体跨膜电位(77.48±5.93)、超氧化物歧化酶[(96.91±8.66)p,kat/g]、Na+_K+-ATP酶活性[(10.48±2.77)μkat/g]明显高于缺血再灌注组[44.47±17.35、(84.46±8.54)μkat/g、(7.37±2.87)μkat/g],线粒体丙二醛[(37.99±5.38)μmol/g]、一氧化氮含量[(10.18±2.02)μmol/g]、Caspase-3阳性细胞数(66.31±8.09)明显低于缺血再灌注组[(44.83±6.48)μmol/g、(12.12±2.14)μmol/g、74.90±7.42]. 结论 EPO对缺血再灌注损伤脑组织产生保护作用的重要机制之一是保护神经细胞线粒体的功能,其核心是抑制线粒体跨膜电位的下降.     

Protective effect of oxysophoridine on cerebral ischemia/reperfusion injury in mice

Oxysophoridine, a new alkaloid extracted from Sophora alopecuroides L., has been shown to have a protective effect against ischemic brain damage. In this study, a focal cerebral ischemia/reperfusion injury model was established using middle cerebral artery occlusion in mice. Both 62.5, 125, and 250 mg/kg oxysophoridine, via intraperitoneal injection, and 6 mg/kg nimodipine, via intragastric administration, were administered daily for 7 days before modeling. After 24 hours of reperfusion, mice were tested for neurological deficit, cerebral infarct size was assessed and brain tissue was collected. Results showed that oxysophoridine at 125, 250 mg/kg and 6 mg/kg nimodipine could reduce neurological deficit scores, cerebral infarct size and brain water content in mice. These results provided evidence that oxysophoridine plays a protective role in cerebral ischemia/reperfusion injury. In addition, oxysophoridine at 62.5, 125, and 250 mg/kg and 6 mg/kg nimodipine increased adenosine-triphosphate content, and decreased malondialdehyde and nitric oxide content. These compounds enhanced the activities of glutathione-peroxidase, superoxide dismutase, catalase, and lactate dehydrogenase, and decreased the activity of nitric oxide synthase. Protein and mRNA expression levels of N-methyl-D-aspartate receptor subunit NR1 were markedly inhibited in the presence of 250 mg/kg oxysophoridine and 6 mg/kg nimodipine. Our experimental findings indicated that oxysophoridine has a neuroprotective effect against cerebral ischemia/reperfusion injury in mice, and that the effect may be due to its ability to inhibit oxidative stress and expression of the N-methyl-D-aspartate receptor subunit NR1.     

白果内酯对高血糖大鼠脑缺血再灌注损伤的保护作用

目的 观察白果内酯对高血糖大鼠脑缺血再灌注损伤的保护作用及其可能机制.方法 采用50%的葡萄糖溶液腹腔注射(6 ml/kg)建立急性高血糖模型.采用线栓法建立大鼠脑缺血再灌注模型,按随机数字表方法将40只大鼠分为高血糖假手术组(假手术组),高血糖+缺血再灌注损伤组(模型组),高血糖+缺血再灌注损伤+白果内酯组(白果内酯组),白果内酯分三个剂量组(2.5,5,10 mg/kg),每组各8只.白果内酯组于术前3 d连续给予白果内酯腹腔注射,术前1 h再给予腹腔注射1次.脑缺血2 h,再灌注24 h后行神经功能缺损评分、脑梗死体积及脑含水量测定,同时测定脑组织中水通道蛋白-4(AQP4)mRNA的表达,超氧化物歧化酶(SOD)的活力,计算脑组织中丙二醛(MDA)的含量及去甲肾上腺素(NE)、多巴胺(DA)和5-羟色胺(5-HT)的表达.结果 白果内酯(5,10 mg/kg)组大鼠与模型组相比,神经功能缺损评分下降,脑梗死体积缩小,脑含水量降低,缺血侧脑组织中AQP4 mRNA的表达下调,SOD活力提高,MDA含量减低,NE、DA及5-HT的含量增加,差异均有统计学意义(P<0.05).结论 白果内酯对高血糖条件下的局灶性脑缺血再灌注损伤具有一定的保护作用.     

肝动脉/门静脉早期复流对肝移植大鼠小肠缺血再灌注损伤的影响

背景：当肝动脉与门静脉早期复流时序不同时,是否会加重对肝移植大鼠小肠缺血/再灌注的损伤尚未见大量报道。 目的：探讨肝动脉与门静脉早期复流对肝移植大鼠小肠缺血/再灌注损伤的影响。 方法：采用门静脉灌注的大鼠自体肝移植模型,78只SD大鼠以简单随机化法分为3组：肝动脉组(n=36)：行自体肝移植手术,以40C乳酸林格液由门静脉灌肝40 min,开放肝动脉及下腔静脉,10 min后开放门静脉;门静脉组(n=36)：行自体肝移植手术,门静脉开放恢复肝脏血流后10 min再开放肝动脉血流;假手术组(n=6)：打开腹腔,游离肝脏后关腹。观察各组小肠显微及超微结构变化并测定一氧化氮水平。 结果与结论：术后各实验组不同时段先后出现小肠绒毛排列不整或紊乱,小肠黏膜细胞线粒体大小不一,明显肿胀,呈类圆形,内有空泡变性,严重者可见嵴减少、断裂或消失。小肠组织一氧化氮水平均升高。上述变化在术后12 h达高峰。术后肝动脉先复流组小肠显微及超微结构损伤及小肠组织一氧化氮水平明显高于门静脉先复流组。提示,肝动脉早期复流可以通过早期肝脏供氧以减少移植肝脏的损害,但门静脉的延迟开放则加重了肝移植大鼠小肠的缺血/再灌注损伤。     

神经节苷脂对大鼠脑缺血再灌注损伤的脑保护作用

目的探讨神经节苷脂对大鼠脑缺血再灌注损伤的脑保护作用。方法采用线栓法制作缺血再灌注大鼠模型,分别用神经节苷脂(治疗组)和生理盐水(对照组)腹腔注射。观察两组大鼠缺血90min、缺血90min再灌注24h的脑梗死面积、神经功能缺损程度、细胞凋亡数、细胞凋亡率。结果治疗组大鼠于相同时间点脑梗死面积较对照组明显减小,仅表现轻度的神经功能缺损,且神经细胞的凋亡数较对照组显著减少(均P<0.01)。结论神经节苷脂能明显减小大鼠实验性脑缺血的脑梗死面积,减轻脑缺血再灌注后神经功能缺损程度,显著减轻缺血区神经元损害,具有显著的脑保护作用。     

Neuronal effects of SP600125 pretreatment in a rat model of cerebral ischemia/reperfusion injury Inhibited down-regulation of DNA repair protein

BACKGROUND： Recent studies have shown that the selective inhibitor of c-Jun N-terminal kinases （JNKs） signaling pathway, SP600125, exhibits neuronal protective effects in a rat model of brain ischemia/reperfusion. OBJECTIVE： To determine the mechanisms of neuroprotective effects of SP600125 in a rat model of brain ischemia/reperfusion, and determine the role of the JNK signaling pathway in SP600125-induced effects. DESIGN, TIME AND SETTING： A randomized, controlled, animal experiment was performed at the Animal Experiment Center, Medical School of Xi＇an Jiaotong University from June 2007 to September 2008. MATERIALS： SP600125 was provided by Biosource, USA; rabbit anti-phospho-JNK （Thr183/Tyr185） polyclonal antibody from Cell Signaling Technology, USA; rabbit anti-X-ray repair cross-complementing protein 1 （XRCC1） and anti-Ku70 polyclonal antibodies from Santa Cruz Biotechnology, USA; and TUNEL kit from Beijing Huamei Biology, China. METHODS： A total of 108 male, 4-month-old, Sprague Dawley rats were randomly assigned to three groups, with 36 rats per group. The sham operation group and ischemia/reperfusion group （I/R group） were intracerebroventricularly injected with 10 μL 1% DMSO. The SP600125-treated group （pre-SP group） was given 10 μL SP600125 （3 μg/μL）. Thirty minutes later, brain ischemia was induced in the I/R and pre-SP groups using the four-vessel occlusion method. Specifically, whole brain ischemia was induced for 6 minutes, and the clips were released to restore carotid artery blood flow. Rats from each group were observed at 2, 6, 12, 24, 48, and 72 hours, with 6 rats for each time point. The sham operation group was treated with the same surgical exposure procedures, with exception of occlusion of the carotid artery. MAIN OUTCOME MEASURES： Hematoxylin-eosin staining was used to observe neuronal survival in the hippocampal CA1 region, TUNEL was used to detect apoptosis in the hippocampal CA1 region, and immunohistochemistry was used to detect expression of phospho-JNK, XRCC1, and Ku70. RESULTS： Following brain ischemia/reperfusion, neuronal survival significantly decreased, and the number of apoptotic cells significantly increased （P 〈 0.01）. Compared with the I/R group, neuronal survival significantly increased in the pre-SP group, and the number of apoptotic cells significantly decreased （P 〈 0.01）. Expression of phospho-JNK increased, and XRCC1 and Ku70 significantly decreased （P 〈 0.05） following ischemia/reperfusion. Compared with the I/R group, expression of phospho-JNK decreased, and XRCC1 and Ku70 significantly increased in the pre-SP group （P 〈 0.05）. Correlation analysis revealed an inverse correlation between phospho-JNK gray value and XRCC1 and Ku70 gray values in the hippocampal CA1 region （r = -0.983, -0.953, P 〈 0.01）. CONCLUSION： SP600125 treatment decreased apoptosis induced by global brain ischemia/reperfusion in the rat hippocampal CA1 region. Results suggested that the neuroprotective effects were due to inhibited phosphorylation of JNK and reduced down-regulation of XRCC1 and Ku70.