Effect and mechanism of salvianolic acid B on the myocardial ischemiareperfusion injury in rats

Objective:To investigate the effect of salvianolic acid B on rats with myocardial ischemiareperfusion injury.Methods:SD rats were randomly divided into five groups(n=10 in each group):A sham operation group,B ischemic reperfusion group model group,C low dose salvianolic acid B group,D median dose salvianolic acid B group,E high dose salvianolic acid B group.One hour after establishment of the myocardial ischemia-reperfusion model,the concentration and the apoptotic index of the plasma level of myocardial enzymes(CTnⅠ,CKMB),SOD,MDA,NO,ET were,measured.Heart tissues were obtained and micro-structural changes were observed.Results:Compared the model group,the plasma CTnⅠ,CK-MB,MDA and ET contents were significantly increased,NO,T-SOD contents were decreased in the treatment group(group C,D,and E)(P0.05);compared with group E,the plasma CTnⅠ,CKMB,MDA and ET levels were increased,the NO,T-SOD levels were decreased in groups C and D(P0.05).Infarct size was significantly reduced,and the myocardial ultrastructural changes were improved significantly in treatment group.Conclusions:Salvianolic acid B has a significant protective effect on myocardial ischemia-reperfusion injury.It can alleviate oxidative stress,reduce calcium overload,improve endothelial function and so on.     

白藜芦醇对大肠杆菌诱导的大鼠膀胱粘膜损伤保护作用机制的研究

目的 探讨白藜芦醇对大肠杆菌诱导的大鼠膀胱粘膜损伤的保护作用机制。 方法 将 45 只(170±10) g 雌性 SD 大鼠随机分为空白对照组、模型对照组和白藜芦醇实验组。 通过尿道向大鼠膀胱内植入导管并进行大肠杆 菌液灌注建立感染性膀胱粘膜损伤模型(模型对照组),白藜芦醇实验组按照 40 mg / kg 剂量灌胃给药,实验结束后 镜检观察大鼠膀胱内壁病理变化。 采用比色法检测超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)、过氧 化氢酶(CAT)、一氧化氮(NO)和丙二醛(MDA)含量;采用 ELISA 法检测膀胱组织内细胞因子白介素-1β( IL-1β)、 IL-6、IL-8、IL-10 和肿瘤坏死因子(TNF-α)的含量;采用 Western Blot 法检测转化生长因子-β1(TGF-β1)的表达。 结果 白藜芦醇给药显著减少膀胱黏膜中炎性细胞数量,显著降低大鼠膀胱组织中 MDA、NO 含量,提高了 SOD、GSH -Px、CAT 活性;明显降低 IL -1β、IL-8、TNF-α,提高 IL-6、IL-10 含量;显著减少 TGF-β1 的蛋白表达。 结论 白藜 芦醇通过抗氧化、抗炎和降低纤维化作用改善大肠杆菌诱导的大鼠膀胱粘膜损伤,避免对膀胱组织伤害。     

Protection effect of Emodin pretreatment on intestinal I-RI damage of intestinal mucosa in ratsa

Objective:To linvestigate the protective effect and mechanism of emodin pretreatment on intestinal mucosa of rats with intestinal ischemia-reperfusion injury.Methods:A total of 50SD rats were randomly divided into control group,model group,emodin groups of low,medium and high dose,with 10 in each group.Ischemia-reperfusion injury(I-RI)mode was established by using noninvasive clamp on superior mesentericartery(SMA).Control group and model group were pretreated with 0.5%sodium carboxymethyl cellulose solution lavage 2 h before operation,emodin groups of low,medium and high dose were given emodin lavage with 20,40,60 mg/kg pretreatment,femoral venous blood before the lavage pretreatment(TO)and 1 h ischemia(Tl),and inferior vena venous blood after 1 h of reperfusion(T2)were extracted from each group of rats for detection of serun level of intestinal fatty acid binding protein(I-FABP),tumor necrosis factor(TNF-α),endotoxin,interleukin 6(IL-6),and die content of diamine oxidase(DAO);Mter model establishment,the rats were sacrificed,intestine homogenate was prepared by using blind intestinal tissue to detect intestinal tissue myeloperoxidase(MPO],malondialdehyde(MDA)and superoxide dismutase(SOD)levels.And upper small intestine tissue was retrieved,followed by fixation and conventional HE staining to observe intestinal tissue morphology under light microscopy.Results:In emodin groups of low,medium and high dose at T1 and T2,I-FABP,TNF-α,endotoxin.IL,-6 and DAO level were significandy lower than that of model group(P0.05);in emodin group of low,medium and high dose,MPO and MDA content in intestinal tissue homogenate was significantly lower than that in model group(P0.05),SOD level was significantly higher than that of model group(P0.05).Intestinal damage of emodin low,medium and high dose groups were significandy lighter than model group.Conclusions:Emodin pretreatment has certain protective effect on intestinal mucosa in ischemia reperfusion injury.     

贝前列腺素钠对2型糖尿病大鼠肾功能及氧化应激水平的影响

目的 观察贝前列腺素钠(BPS)对2型糖尿病大鼠肾功能及氧化应激水平的影响. 方法 将30只SD大鼠随机分为正常对照组(NC组),2型糖尿病组(T2DM组),BPS治疗组(BPS组),T2DM组和BPS组大鼠给予高脂饮食合并小剂量链脲佐菌素( STZ)腹腔注射,建模成功后,BPS组给予0.6 mg/(kg.d)灌胃,其余饲养条件3组相同,最终纳入实验各组6只.给药8周后检测各组大鼠体质量、血糖、24 h尿量、肾质量体质量比(KW/BW)、24h尿蛋白(24 h Ualb),血肌酐(Cr),尿素氮(BUN)以及各组大鼠氧化应激水平及炎症因子指标,包括总超氧化物歧化酶(SOD)、丙二醛(MDA)、还原型谷胱甘肽(GSH)、白介素6(IL-6)、肿瘤坏死因子(TNF-α)、髓过氧化物酶(MPO)、超敏C反应蛋白(hs-CRP). 结果 给药8周后,T2DM组血糖、尿量、KW/BW、24 h Ualb、Cr、BUN、MIDA、IL-6、TNF-α、MPO、hs-CRP水平均较NC组显著升高;体质量、SOD、GSH水平较NC组显著降低(P＜0.01).BPS组较T2DM组血糖、尿量、KW/BW、24 h Ualb、Cr、IL-6、M DA、TNF-α、MPO、hs-CRP水平显著降低(P＜0.05或0.01),体质量、SOD、GSH水平显著升高(P＜0.05). 结论 BPS可通过降低氧化应激水平,减少炎症因子的生成,显著减少糖尿病肾病大鼠尿蛋白排泄量,改善其肾功能,对T2DM大鼠肾脏具有保护作用.     

nmhaFGF对SD大鼠缺血再灌注视网膜SOD、MDA、NO的影响

目的观察非促分裂人酸性成纤维细胞生长因子（nmhaFGF）对大鼠视网膜缺血再灌注损伤后视网膜超氧化物歧化酶（SOD）、丙二醛（MDA）、一氧化氮（NO）的影响.方法 40只SD大鼠随机分为对照组10只,实验组（nmhaFGF组）30只.实验组（大鼠左眼）又分为nmhaFGF低剂量组（1.25μg组）、nmhaFGF中剂量组（2.5μg组）、nmhaFGF高剂量组（5μg组）各10只,右眼为模型组（给予等量生理盐水）.采用升高眼内压的方法建立大鼠视网膜缺血再灌注模型.再灌注24h后分光光度法测定视网膜MDA、SOD含量,GRIESS反应测定NO含量.结果与模型组相比,nmhaFGF中剂量组、nmhaFGF高剂量组MDA含量显著降低（P＜0.01）,SOD、NO含量显著升高（P＜0.05）;nmhaFGF低剂量组和模型组之间SOD、MDA、NO含量没有显著差异（P＞0.05）.结论 nmhaFGF具有抗视网膜缺血再灌注氧自由基的作用;视网膜缺血再灌注损伤时,nmhaFGF可以增加视网膜内NO的含量,并呈现一定的量效关系.     

辣椒素减轻肾缺血再灌注损伤的线粒体相关机制

目的探讨辣椒素对大鼠肾缺血再灌注损伤的保护作用及线粒体相关作用机制。方法将50只雄性SD大鼠分成假手术组、肾缺血再灌注损伤组和辣椒素低、中、高剂量组。采用夹闭双侧肾蒂构建肾缺血再灌注损伤模型。肾缺血45 min,再灌注24 h,过量麻醉法处死大鼠,收集肾脏和血清。检测血清肌酐(SCr)、血尿素氮(BUN)、肾脏组织病理形态和细胞凋亡,测定线粒体三磷酸腺苷(ATP)和丙二醛(MDA)含量以及Ca~(2+)-ATP酶、Na~+-K~+-ATP酶、过氧化氢酶(CAT)、谷胱甘肽过氧化物酶(GPx)和超氧化物歧化酶(SOD)活性。结果辣椒素干预可减少SCr和BUN含量,降低肾组织病理改变和细胞凋亡,增加线粒体Ca~(2+)-ATP酶、Na~+-K~+-ATP酶、CAT、GPx和SOD酶活性以及ATP的含量,但减少MDA的水平。结论辣椒素对肾缺血再灌注损伤有保护作用,其作用呈浓度效应,机制与抑制线粒体脂质过氧化相关。     

SOD在肾缺血再灌注损伤大鼠肺内的表达变化

目的 观察肾缺血再灌注损伤大鼠肺内超氧化物歧化酶(superoxide dismutase,SOD)的表达变化,探讨SOD在抗氧化应激反应中的作用.方法 Wistar大鼠切除右肾,无损伤动脉夹夹闭左肾动脉,建立大鼠肾缺血再灌注损伤模型.再灌注24 h后取材(肺、肾、血).酶偶联速率法和苦味酸法分别检测血尿素氮(blood urea nitrogen,BUN)、血清肌酐(serum creatinine,SCr)浓度;HE染色法观察大鼠肾形态;硫代巴比妥酸比色法检测肺内丙二醛(malondialdehyde,MDA)的含量;采用Western blot和RT-PCR方法分别测定大鼠肺组织内抗氧化酶SOD的蛋白与mRNA表达水平.结果 HE结果显示肾缺血再灌注损伤组大鼠的肾组织受损明显.与对照组相比,肾缺血再灌注损伤组血清中的BUN和SCr、肺组织中的MDA含量均明显升高(P值均＜0.01),SOD的蛋白与mRNA的表达水平均明显升高(P值均＜0.01).结论 肾缺血再灌注损伤大鼠的肺组织发生了过氧化损伤.SOD在肾缺血再灌注损伤大鼠的肺组织内发挥了抗氧化应激的作用.     

解毒化瘀方对内毒素血症大鼠肝细胞线粒体氧化损伤的影响

目的:观察解毒化瘀方对内毒素血症( endotoxemia,ETM)大鼠肝细胞线粒体氧化损伤的影响.方法:将56只大鼠随机分为正常对照组及内毒素注射后6小时、12小时、24小时组和解毒化瘀方6小时、12小时、24小时组.眼眶取血,检测大鼠血清肿瘤坏死因子(TNF)-α水平,同时取肝组织分离线粒体,测定其丙二醛(MDA)的含量及超氧化物岐化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)的活性.结果:在注射内毒素6小时后,大鼠血清TNF-α水平及线粒体MDA的含量升高,线粒体SOD、GSH-Px活性下降,随着时间的延长,TNF-α水平及MDA的含量进一步升高,SOD、GSH-Px活性明显下降.与对应的内毒素组比较,经解毒化瘀方处理后,TNF-α水平及MDA的含量均降低,SOD、GSH-Px活性均升高.结论:解毒化瘀方对内毒素刺激Kupffer细胞释放TNF-α有抑制作用,同时减少内源性自由基的生成,提高机体的抗氧化损伤能力,具有保护肝细胞的作用.     

The effect of ischemic precondition to IL-6 on rat liver ischemia-reperfusion injury in transplantation

ObjectiveTo investigate the effect of ischemic precondition to protect ischemia-reperfusion injury and reduce IL-6 expression in the rats liver transplantation.MethodsThe rat portal vein infusion of autologous liver transplantation model were used. The rats were divided into ischemic preconditioning rats liver transplantation group (A group), the rats liver transplantation group (B group) and the normal rat control group (C group). Then we analyzed the changes of liver function, liver microstructure and the expression of IL-6, SOD and MDA within 48 h.ResultsThe pathology of liver in group A showed lobular architecture essentially normal, the liver cells was slightly swell and no significant changes in postoperative 12 h. In transmission electron microscope (46 000×), the mitochondria of liver cells in group A became swelling, elliptical can cristae partially broken. But there still has a small amount of arrangement. While that in group, the mitochondria were swollen, became round, serious visible crest reduce or ruptured. The result of over function test showed that the serum ALT and AST levels in group A and B were both higher than that in group C at each time period, but the serum ALT and AST levels in group A were lower than that in group B. The expression changes of IL-6 in group B were higher than that in group A and B (P<0.05). The expression of MDA in group A is more obvious than that in group B (P<0.05)ConclusionsIschemic precondition could alleviate part of ischemia-reperfusion injury in the rat liver transplantation, and also could reduce IL-6 expression to protect the liver cells against liver damage and inflammatory cytokine production.     

吲哚美辛胃损伤中内皮素、一氧化氮、氧自由基的作用及其与胃动力的关系

目的 :研究吲哚美辛胃损伤中内皮素 (ET)、一氧化氮 (NO)、氧自由基的作用 ,以及胃动力对这种损伤的影响。方法 :雄性DS大鼠随机分 4组 :对照组、吲哚美辛 5mg/kg组、吲哚美辛 2 5mg/kg组、阿托品组 (阿托品 1mg/kg +吲哚美辛 2 5mg/kg)。吲哚美辛灌胃 ,灌胃前 10min阿托品皮下注射。取动脉血测ET、NO、丙二醛 (MDA)、超氧化物歧化酶 (SOD)、谷胱甘肽过氧化物酶 (GSH Px)水平 ,进行胃形态学观察。结果 :5mg/kg吲哚美辛不引起胃粘膜损伤 ,各检测指标与对照组无差异 ;2 5mg/kg吲哚美辛可引起胃粘膜显著出血性损伤 ,损伤指数为 38 5 7± 12 4 7,病理损伤积分为13 36± 3 37;ET 1和MDA水平升高 (P <0 0 1) ,NO、SOD、GSH Px水平降低 (P <0 0 1,P <0 0 1,P <0 0 5 ) ;阿托品组粘膜损伤较轻 ,损伤指数为 8 71± 3 35 ,病理损伤积分为 3 77± 1 0 4,ET 1含量和对照组无差异 ,MDA水平升高 (P <0 0 5 ) ,NO、SOD含量有所下降 (P <0 0 5 ) ,GSH Px含量无变化。结论 :吲哚美辛所致胃粘膜损伤中 ,ET 1和MDA生成增加起损害作用 ,内源性NO、SOD和GSH Px可清除氧自由基 ,有保护作用 ;阿托品对吲哚美辛所致胃粘膜损伤的保护作用 ,提示胃动力增加在吲哚美辛致溃疡中有重要作用。     

心脑肾康对自由基清除作用的实验研究

目的研究心脑肾康对自由基的清除作用。方法连续给大鼠灌胃心脑肾康7d后，以线栓法建立大脑中动脉梗死（MCAO）缺血再灌注模型，缺血1．5h再灌注24h后断头取脑，检测大脑皮层丙二醛（MDA）、超氧化物歧化酶（SOD）、一氧化氮（NO）、活性氧（ROS）、谷胱甘肽（GSH）含量。结果与模型组相比，商、中、低3个剂量心脑肾康用药后均能显著降低缺血后脑组织匀浆中MDA、NO、ROS含量，增加SOD、GSH活性（P〈0．05）并呈剂量依赖性。其中，高剂量效果最好，优于阳性对照药（P〈0．05）。结论心脑肾康具有良好的自由基清除作用。     

L-精氨酸对糖尿病大鼠肾脏、大脑、睾丸氧自由基和抗氧化水平的影响

目的探讨L-精氨酸对糖尿病(DM)大鼠肾脏、大脑、睾丸氧自由基和抗氧化水平的影响.方法给大鼠腹腔注射四氧嘧啶制备DM模型,随机分为DM组、L-精氨酸治疗组及正常对照组;用药4 w末处死大鼠,测定肾脏、大脑及睾丸组织一氧化氮合酶(NOS)、超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)活性及一氧化氮(NO)、丙二醛(MDA)含量.结果 DM大鼠睾丸NOS活性(P＜0.01)及大脑、睾丸NO含量(P＜0.05,P＜0.001)、肾脏SOD(P＜0.001)、肾脏、大脑、睾丸GSH-Px活性(P＜0.01,P＜0.001,P＜0.05)均较正常对照组显著降低,而肾脏、大脑、睾丸MDA含量均较正常对照组明显升高(均P＜0.001);L-Arg可显著增加DM大鼠肾脏、大脑、睾丸NOS活性和NO含量(均P＜0.001)及大脑SOD(P＜0.01)、大脑、睾丸GSH-Px活性(P＜0.05,P＜0.001),并使肾脏、大脑、睾丸MDA含量显著降低(分别P＜0.01,P＜0.001,P＜0.001).结论 DM大鼠肾脏、大脑、睾丸组织存在脂质过氧化损伤;L-Arg通过提高NO含量,保护抗氧化酶活性,对DM大鼠肾脏、大脑、睾丸组织的氧化应激有一定的减轻作用.     

卒中Ⅰ号方预处理对局灶性脑缺血再灌注大鼠脑组织一氧化氮、丙二醛、超氧化物歧化酶和肿瘤坏死因子-α含量的影响

目的 探讨卒中Ⅰ号方预处理对局灶性脑缺血再灌注大鼠的保护作用及其机制.方法 60只SD大鼠随机分为假于术组、缺血再灌注组、氟桂利嗪组以及卒中Ⅰ号方小剂量、中等剂量和大剂量组,每组10只.采用线枪法制作大鼠局灶性脑缺血再灌注模型(缺血3 h再灌注24 h).一氧化氮(nitric oxide,NO)测定采用硝酸还原酶法,超氧化物歧化酶(superoxide dismutase,SOD)采用黄嘌呤氧化酶法,丙二醛(malondialdehyde,MDA)采用硫代巴比妥法,肿瘤坏死因子-α(tumor necrosisfactor-α,TNF-α)采用酶联免疫吸附试验检江测.结果 卒中Ⅰ号方预处理能显著改善脑缺血再灌注大鼠神经功能缺损,降低脑组织NO和MDA含量,提高SOD活性,下调TNF-α表达,其中大剂量组作用更为显著(P<0.01),中等剂量组和小剂量组与脑缺血再灌注组亦差异显著(P<0.05).结论 卒中Ⅰ号方预处理对脑缺血再灌注损伤具有保护作用,其机制可能与降低脑组织NO和MDA含量、提高SOD活性以及下调TNF-α表达有关.     

愈疡1号颗粒对胃溃疡大鼠自由基代谢相关因素的影响

[目的]探讨愈疡1号颗粒对胃溃疡（Gu）大鼠自由基代谢相关因素表达的影响。[方法]应用冰乙酸注射法建立大鼠GU模型,随机分为5组,即正常组、模型组、奥美拉唑组及愈疡1号颗粒高、低剂量（高、低剂量）组,给予相应干预后测定各组大鼠胃黏膜丙二醛（MDA）、超氧化物歧化酶（SOD）、谷胱甘肽过氧化物酶（GSH—Px）、一氧化氮（N0）的表达及血清NO水平。[结果]模型组大鼠胃黏膜MDA、NO水平均较正常组显著升高,SOD、GSH—Px活性均较正常组显著降低。与模型组比较,高、低剂量组均能够明显提高大鼠胃黏膜SOD、GSH—Px活性,明显降低MDA、NO水平。高剂量组能明显降低血清NO水平。[结论]愈疡1号颗粒通过降低胃黏膜MDA、NO表达及血清NO水平,提高胃黏膜SOD和GSH-Px的表达,起到保护胃黏膜的作用,是其治疗GU的重要机制之一。     

Mibefradil, a T-Type Ca2+ Channel Blocker, Protects Against Mesenteric Ischemia-Reperfusion-Induced Oxidative Injury and Histologic Alterations in Intestinal Mucosa in Rats

The purpose of the present study was to investigate whether mibefradil can reduce oxidative stress and histologic damage in the rat small bowel subjected to mesenteric ischemia and reperfusion injury. Thirty Sprague-Dawley rats weighing between 210 and 220 g were divided into three groups, each containing 10 rats: group 1, sham operation; group 2, untreated ischemia-reperfusion; and group 3, ischemia-reperfusion plus mibefradil treatment group. Intestinal ischemia for 45 min and reperfusion for 60 min were applied. Ileal specimens were obtained to determine the tissue levels of MDA, CAT, SOD, and GSH-Px and histologic changes. In group 2, MDA values were significantly increased compared to those in groups 1 and 3. In addition, SOD, CAT, and GSH-Px values decreased significantly in group 2 compared to groups 1 and 3. The intestinal injury score increased significantly in group 2 and 3 rats compared to group 1 rats. However, this increase was reduced in group 3 rats compared to group 2. Histopathologically, the rats in group 1 had essentially normal testicular architecture. In group 2 rats, the lesions varied between grade 3 and grade 5. In contrast, most of the specimens in the mibefradil-treated group 3 showed grade 1 injury. Mibefradil plays a role in attenuating reperfusion injury of the small intestine by depressing free radical production and mucosal injury score and regulating postischemic intestinal perfusion while restoring intestinal microcirculatory blood flow and encountered histologic injury.     

中药对脑缺血再灌注损伤保护的研究进展

综述中药对脑缺血再灌注损伤的保护作用，为临床防治缺血再灌注损伤提供一定的理论依据。     

苦参碱对高糖诱导的H9C2心肌细胞损伤的影响

目的探讨苦参碱对高糖诱导的H9C2心肌细胞损伤的影响。方法将H9C2心肌细胞随机分为正常糖组、正常糖苦参碱组、高糖组和高糖苦参碱组。实时荧光定量PCR检测超氧化物歧化酶2(SOD2)、Gp91phox、BAX、BCL-2、TNF-α、白细胞介素(IL)-1β和IL-6 mRNA表达;Western blot检测SOD2、P67phox、BAX、BCL-2、剪切形式半胱氨酸天冬氨酸蛋白酶3(C-Caspase-3)、NF-κB P65亚基磷酸化(P-P65)和NF-κB P65总蛋白(T-P65);试剂盒检测细胞内丙二醛质量、谷胱甘肽过氧化物酶(GSH-Px)及过氧化氢酶(CAT)活性;TUNEL检测细胞凋亡。结果正常糖组与正常糖苦参碱组丙二醛和GSH-Px及CAT活性等指标比较,无统计学差异(P>0.05);与正常糖组比较,高糖组丙二醛、P67phox、P-P65、BAX、C-Caspase-3蛋白、Gp91phox、IL-1β、IL-6、TNF-αmRNA表达和细胞凋亡率明显升高,GSH-Px、CAT活性明显降低[(0.98±0.02)U/mg vs(3.82±0.05)U/mg,(12.18±0.52)U/mg vs(34.82±0.63)U/mg,P<0.05],SOD2、BCL-2蛋白及mRNA表达明显下调(P<0.05);与高糖组比较,高糖苦参碱组丙二醛、P67phox、P-P65、BAX、C-Caspase-3蛋白、Gp91phox、IL-1β、IL-6、TNF-αmRNA表达和细胞凋亡率明显降低,GSH-Px、CAT活性、SOD2、BCL-2蛋白及mRNA表达明显上调(P<0.05)。结论苦参碱可以明显改善高糖诱导的H9C2心肌细胞损伤,这可能与其抗氧化、抗炎和抗凋亡活性有关。     

柚皮素预处理对大鼠心肌缺血再灌注损伤的保护作用

目的观察柚皮素（naringenin,NAR）对大鼠心肌缺血再灌注损伤（IRI）的保护作用。方法32只雄性SD大鼠（220 g~250 g）随机分为假手术组（control,n=8）、IRI组（n=8）、NAR 50 mg/kg组（n=8）和NAR 100 mg/kg组（n=8）。NAR 50 mg/kg和NAR 100mg/kg组均在IRI前2 h予相应NAR腹腔注射。大鼠心肌IRI模型制备方法：结扎左冠状动脉前降支30 min,再灌注180 min,而后180 min检测各组大鼠血清白介素1β（IL-1β）、肿瘤坏死因子α（TNF-α）、乳酸脱氢酶（LDH）、肌酸激酶（CK）、超氧化物歧化酶（SOD）和丙二醛（MDA）含量以及再灌后24 h检测心肌梗死面积。结果NAR可显著降低大鼠心肌IRI后心肌梗死面积（与IRI相比,P＜0.05）,同时还可以显著减轻IRI后血清中IL-1β、TNF-α、LDH、CK和MDA的水平,增加SOD水平（与IRI相比,P＜0.05）,并呈浓度依赖性。结论NAR对心肌IRI具有明显的保护作用,其保护机制与抑制IRI后炎症反应和清除氧化应激损伤有关。     

家兔肝缺血再灌注损伤中脂质过氧化反应及人参多糖的干预

目的 观察肝缺血再灌注损伤时脂质过氧化的变化以及人参多糖的干预作用,并探究其机制.方法 30只家兔随机均分为对照组、缺血再灌注组和人参多糖组.观察血浆及肝组织中丙二醛含量及超氧化物歧化酶、谷胱甘肽过氧化物酶、黄嘌呤氧化酶和丙氨酸氨基转移酶活力变化,光镜下观察肝组织结构变化,并观察人参多糖对上述指标的影响.结果 缺血再灌注组血浆超氧化物歧化酶和谷胱甘肽过氧化物酶活力在肝脏缺血45 min以及再灌注45 min逐步降低,丙氨酸氨基转移酶、黄嘌呤氧化酶活力和丙二醛含量明显升高.人参多糖组血浆超氧化物歧化酶和谷胱甘肽过氧化物酶活力与缺血前比无明显下降,丙氨酸氨基转移酶、黄嘌呤氧化酶活力和丙二醛含量无明显升高,尤其再灌注45 min血浆超氧化物歧化酶活力显著高于缺血再灌注组同期(P<0.01),丙氨酸氨基转移酶、黄嘌呤氧化酶活力和丙二醛含量显著低于缺血再灌注组同期水平(P<0.01).肝组织超氧化物歧化酶、谷胱甘肽过氧化物酶活力缺血再灌注组明显低于对照组,人参多糖组则明显高于缺血再灌注组(P<0.01);黄嘌呤氧化酶活力和丙二醛含量缺血再灌注组明显高于对照组(P<0.05或P<0.01),而人参多糖组则明显低于缺血再灌注组(P<0.05或P<0.01).光镜下发现缺血再灌注组肝组织细胞形态学结构明显异常,人参多糖组肝组织损伤明显减轻.结论 人参多糖能降低黄嘌呤氧化酶活性,减少氧自由基的生成,并且能增强超氧化物歧化酶、谷胱甘肽过氧化物酶等抗氧化酶的活性,清除氧自由基,抑制脂质过氧化反应,从而有效减轻肝缺血再灌注损伤.     

Effect of rosiglitazone on rabbit model of myocardial ischemia-reperfusion injury

ObjectiveTo explore mechanism and protective effect of rosiglitazone on myocardial ischemia reperfusion (I/R) injury.MethodsA total of 48 male Japanese white big-ear rabbits were randomly divided into control group (A), I/R group (B), low dose of rosiglitazone group (C), high dose of rosiglitazone group (D). Plasma concentration of and also reduced the concentration of plasma serum creatine kinase (CK), CK-MB, high-sensitivity C-reactive protein (hsCRP), ultra-superoxide dismutase (SOD), malondialdehyde (MDA), lactic acid glutathione skin peroxidase (GSH-PX), nitric oxide (NO) and endothelin (ET) were measured 1 h later after I/R. Twenty-four hours after I/R the hearts were harvested for pathological and ultrastructural analysis. Area of myocardial infarction were tested.ResultsPlasma concentration of CK, CK-MB, hsCRP, NO, MDA and ET were decreased in C, D group compared with group B. Plasma concentration of T-SOD and GSH-Px were increased significantly in C, D group compared with group B. Compared with group B, pathological and ultrastructural changes in C and D group were slightly. There was significant difference in myocardial infarction area between group C, D and group B (P<0.05). Myocardial infarction area and arrhythmia rate were lower in group C, D compare with group B.ConclusionsRosiglitazone may protect myocardium from I/R injury by enhancing T-SOD and GSH-Px concentration, inhibit inflammatory reaction, and improve endothelial function.