缺血后处理对大鼠肝脏缺血再灌注损伤的保护作用

目的探讨缺血后处理对大鼠肝脏缺血再灌注损伤的保护作用。方法将75只SD大鼠随机分为假手术组、缺血再灌注组和缺血后处理组,建立大鼠肝脏局部缺血再灌注模型。检测大鼠血清、肝组织丙二醛（MDA）、超氧化物歧化酶（SOD）水平,并行肝组织病理学和超微结构检查及免疫组化法检测内源性一氧化氮合成酶（eNOS）的表达。结果与缺血再灌注组相比,缺血后处理组血清ALT和AST水平及肝组织MDA明显降低（P＜0．01）,而SOD水平则显著升高（P〈0．01）;肝组织病理损伤减轻,在再灌注7min时IPO组肝组织eNOS蛋白表达比IR组增强。结论缺血后处理可通过抑制再灌注后氧自由基的过量生成和再灌注损伤保护激酶通路,从而减轻肝细胞损伤。     

缺血后处理对大鼠急性心肌缺血再灌注损伤的影响

目的观察在体条件下缺血后处理对大鼠心肌缺血再灌注损伤的作用及可能的途径。方法建立大鼠在体缺血再灌注模型,将30只大鼠随机分为假手术组、缺血再灌注组、缺血后处理组、缺血预适应组。于再灌注末测定心肌酶,超氧化物歧化酶(SOD)及丙二醛(MDA)的含量,并测定心肌组织梗死面积。结果与缺血再灌注组相比,缺血后处理组与缺血预适应组心肌梗死面积明显减小,血浆肌钙蛋白I及MDA的含量均降低(P<0.05),血浆SOD活性升高(P<0.05)。结论缺血后处理可减轻心肌缺血再灌注损伤,具有心肌保护效应。     

预处理对肝脏再灌注损伤大鼠肝组织、血液中NO和ET的影响及意义

目的　探讨预处理对肝脏缺血再灌注损伤大鼠肝组织和血液中一氧化氮 (NO)和内皮素 (ET)含量的影响及意义。方法　建立肝脏 70 %缺血再灌注损伤大鼠模型 ,分为对照组、缺血组、缺血预处理组、L -精氨酸组(L - arg)、Nω-硝基 - N -精氨酸甲酯 (L - NAME)组 ,观察各组肝功能变化 ,检测肝组织和血清中 NO和 ET及透明质酸 (HA)水平。结果　预处理可减轻 NO水平的下降和血浆 ET的升高 ,防止肝功酶的升高 (P<0 .0 5 )。结论　预处理可诱导缺血再灌注损伤大鼠 NO产生增加、ET产生减少 ,进而改善其微循环 ,减少再灌注损伤。     

参附注射液抗肝脏缺血再灌注损伤作用的研究

目的研究参附注射液在抗大鼠肝脏缺血再灌注损伤（hepatic ischemia reperfusion injury,HIRI）中的保护作用。方法将30只大鼠随机分为实验组和对照组,建立常温下部分肝脏缺血再灌注动物模型。动态观察血清天冬氨酸转氨酶（AST）、丙二醛（MDA）、超氧化物岐化酶（SOD）、肿瘤坏死因子（TNF-α）和内皮素-1（ET-1）的水平。术后取肝组织作光镜和电镜观察。结果实验组血清AST、MDA、TNF-α、ET水平均显著低于对照组水平（P〈0.05）,SOD水平高于对照组（P〈0.05）。与对照组比较,实验组大鼠肝细胞和肝窦内皮细胞变性和坏死程度较轻。结论参附注射液具有抗肝脏缺血再灌注损伤的保护作用,主要通过抑制氧自由基产生。     

大鼠肝脏缺血再灌注损伤对氧自由基、一氧化氮、内皮素及炎性细胞因子的影响

肝脏缺血再灌注损伤（HIRI）是肝脏外科疾病中常见的病理过程.导致肝脏HIRI的原因很多,与以下三个因素有关：①肝脏缺血期的低氧损伤;②再灌注后肝窦内皮细胞和肝细胞的损伤;③继发于内皮细胞损伤的微循环障碍.但确切的发病机制仍不十分清楚.本研究旨在通过测定HIRI大鼠模型血浆超氧化物歧化酶（SOD）、丙二醛（MDA）、一氧化氮（NO）、内皮素（ET）、肿瘤坏死因子-α（TNF-α）、白细胞介素（IL）-6、IL-8及IL-10含量的变化,探讨大鼠肝脏HIRI对氧自由基、NO、ET及炎性细胞因子的影响.     

缺血预处理与缺血后处理对大鼠肾脏的保护作用对比观察

目的比较缺血预处理及缺血后处理对大鼠肾脏缺血再灌注损伤的保护作用。方法建立大鼠肾脏缺血（45min）再灌注模型。将24只健康Wistar大鼠随机分为假手术（SO）、缺血再灌注（Ia）、缺血预处理（IP）及缺血后处理（IPo）组,各6只。IP组于缺血前给予3周期的8min缺血、5min再灌注,IPo组于缺血后（再灌注前）给予6周期的10s再灌注、10s缺血。24h后观察血清肌酐（Cr）、尿素氮（BUN）、NO;取肾脏组织测定其超氧化物歧化酶（SOD）和丙二醛（MDA）。结果与IR组相比,IPo组及IP组血清Cr、BUN、NO和MDA水平降低（P〈0．05）,肾组织中SOD、MDA水平升高（P〈0．05）;IPo组与IP组相比,以上指标无显著性差异（P〉0．05）。结论IP和IPo对大鼠肾脏缺血再灌注都有保护作用,二者保护作用无区别。     

茶多酚对大鼠肝脏缺血-再灌注损伤的保护作用

目的探讨茶多酚对大鼠肝脏缺血再灌注损伤的保护作用及其机制。方法健康雄性SD大鼠30只，随机均分为4组：假手术正常对照组6只；肝脏缺血再灌注损伤模型组8只；茶多酚低浓度于预组8只（75mg／kg）；茶多酚高浓度于预组8只（150mg／kg）．缺血30min再灌注60min检测肝组织MDA含量、GSH-PX活性及血浆ALT含量。光镜下比较各组肝组织损伤情况。结果肝缺血再灌注模型组ALT、MDA含量明显高于假手术正常对照组（P〈0．01），GSH-PX活力则降低（P〈0．01）；茶多酚低浓度及高浓度组ALT，MDA含量均明显低于肝缺血再灌注模型组（P〈0．01），而GSH-Px活力均高于肝缺血再灌注模型组（P〈0．01）；光镜观察茶多酚低浓度及高浓度预处理组肝细胞损伤明显小于肝缺血再灌注模型组。结论茶多酚对大鼠肝脏缺血再灌注损伤具有显著的保护作用。     

苦参碱对大鼠原位肝移植冷缺血再灌注损伤的保护作用

目的:探讨苦参碱对大鼠原位肝移植中供肝冷缺血再灌注损伤的保护作用及其机制方法:应用延长保存的大鼠原位肝移植模型, 大鼠224只随机分为对照组、低剂量(40 mg／ kg)、高剂量苦参碱治疗组(80 mg／kg)和假手术组,将供肝在4℃林格液中保存5 h后植入受体,分别观察移植术后1 wk生存率,并且检测移植术后1,2,4,24 h血ALL TNF-α,内毒素 (ET),透明质酸(HA),一氧化氮(NO)及肝组织丙二醛(MDA),超氧化物歧化酶(SOD),细胞间黏附分子-1(ICAM-1)的含量,并观察移植肝脏病理形态学的改变．结果:与对照组比较,苦参碱低剂量、高剂量治疗组术后1 wk生存率显著增加(75％,75％ vs 0,P<0．01),肝功能改善,血清HA(277．62 ±29．06,406．84±95．04 μg／L vs 1109．42± 110．28 μg／L,P<0．01)和肝组织ICAM-1表达均显著减少,血清NO含量增加(53．1±5．1,54．2 ±4．9 μmol/L vs 30．2±2.3 μmol／L,P<0．01), TNF-α(1．69±0．22,1．29±0．33 U／L vs 5．96 ±0．59 U／L,P<0．01)、ET(0．343±0．111, 0_302±0．059 kEU／L vs 0．643±0．110 kEU／L． P<0．01)以及肝组织MDA(0．87±0．41,0．69± 0．22 μmol／g vs 2．35±0．54 μmol／g,P<0．01) 水平均明显降低,肝组织SOD(19．89±1．84, 21．04±1．86 kU／g vs 13．39±0．85 kU／g,P<0．01) 水平均明显升高,肝细胞和肝窦内皮细胞形态也发生改善．结论:苦参碱可以通过减轻再灌注后内毒素血症,抑制库氏细胞激活及释放TNF-α, ICAM-1等炎症性细胞因子,清除氧自由基,促进NO合成等途径,减轻肝细胞及肝窦内皮细胞的损伤．     

PrxⅥ、SOD、CAT在肝脏缺血再灌注损伤大鼠模型脑内的表达

目的 观察过氧化物酶Ⅵ(PrxⅥ)、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)在大鼠肝脏缺血再灌注损伤模型脑内的表达变化.方法 雄性Wistar大鼠随机分为对照组和肝脏缺血再灌注损伤组,通过无损伤血管夹夹闭通往大鼠肝左叶、肝中叶的血管和胆管蒂,30 min后松开血管夹,制造大鼠70％肝脏缺血再灌注损伤模型.6h后取血、肝脏和脑组织.全自动生化分析仪测血清ALT含量,HE法观察大鼠肝脏和脑组织形态学改变,脑组织MDA含量由南京建成试剂盒测定,采用RT-PCR的方法观察大鼠脑内PrxⅥ、SOD、CAT mRNA水平的表达变化,SOD活性采用黄嘌呤氧化酶法测定,PrxⅥ的蛋白水平采用Western印迹测定.结果 与对照组相比,血清中ALT水平和肝脏HE结果均显示肝脏缺血再灌注损伤组大鼠的肝细胞明显受损,证明大鼠肝脏缺血再灌注损伤模型成立.虽然脑组织的HE结果显示脑的形态学结构未发生明显改变,但脑组织内MDA的含量却增加(P＜0.01).同时,PrxⅥmRNA和蛋白水平均升高(P＜0.01),SOD和CAT mRNA水平(P＜0.01)和抗氧化活性(P＜0.01)也都明显增强.结论 在大鼠肝脏发生缺血再灌注损伤后脑内的氧化应激水平也随之增强,而PrxⅥ、SOD、CAT在脑内均发挥了抗氧化应激作用,对脑组织具有一定的保护功能.     

肝脏肿瘤缺血再灌注损伤后超氧化物歧化酶和丙二醛的改变及意义

目的　探讨缺血再灌注对肿瘤组织的影响及其意义。方法　通过超声引导将VX2肿瘤组织混悬液穿刺注射到新西兰兔肝脏左中叶 ,建立肝脏肿瘤模型 ,用无损伤血管钳阻断肿瘤所在肝叶的肝动脉分支 60min后去除血管阻断恢复血流 ,随机将模型动物分为缺血再灌注前 (对照 )、缺血再灌注后 0min、1h、1d、3d、1周 6个时间组 ,取肝脏组织和肿瘤组织 ,分别测定超氧化物歧化酶 (SOD)和丙二醛 (MDA)的含量。结果　肝脏组织中的SOD含量于缺血再灌注后迅速下降 ,至 0min达最低点 ,随后有所升高 ,至 7d时仍明显低于缺血再灌注前水平 ,各组与对照组对比差异显著 (P <0 .0 0 1) ,而肿瘤组织的SOD含量变化趋势除了 1h达最低点外 ,其余皆与肝脏组织相似 ,各组与对照组对比差异显著 (P<0 .0 0 1) ;肝脏组织的MDA含量于 0min时升至最高 ,随后开始下降 ,至 7d时仍高于缺血再灌注前水平 ,各组与对照组对比差异显著 (P <0 .0 0 1) ,而肿瘤组织的MDA含量于 1h降至最低 ,随后有所升高 ,但至 7d时仍明显低于缺血再灌注前水平 ,各组与对照组比较差异显著 (P <0 .0 0 1)。结论　肿瘤组织缺血再灌注后氧自由基的生成和损伤较正常肝脏组织明显。     

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.     

吡格列酮通过抑制脂质过氧化减轻内皮素-1引起大鼠心肌细胞的损伤

目的:探讨吡格列酮（PIO）减轻内皮素-1（ET-1）引起大鼠心肌细胞损伤的作用及其机制。方法: 将原代培养的大鼠心肌细胞分为5组:DMEM组（对照组）、ET-1组、ET-1+PIO（1×10-9 mol/L） 组、ET-1+PIO（1×10-8 mol/L）组及ET-1+PIO（1×10-7 mol/L）组。将大鼠心肌细胞培养24 h后,吸取培养液,按试剂盒说明书测定心肌细胞培养液中乳酸脱氢酶（LDH）、超氧化物歧化酶（SOD）的活性及丙二醛(MDA)的含量。结果: 药物干预24 h,培养液中LDH的活性ET-1组明显高于对照组（P<0.01）,而ET-1+PIO组LDH的活性低于ET-1组,其中1×10-8mol/L和1×10-7mol/L PIO+ET-1组较ET-1组明显降低（分别为P<0.05,P<0.01）。SOD的活性:ET-1组明显低于对照组（P<0.01）,ET-1+PIO组高于ET-1组,其中1×10-8 mol/L和1×10-7 mol/L PIO+ET-1组较ET-1组明显升高（分别为P<0.05,P<0.01）。MDA的含量:ET-1组明显高于对照组（P<0.01）,ET-1+PIO组低于ET-1组,其中1×10-8 mol/L和1×10-7 mol/L PIO+ET-1组较ET-1组明显降低（分别为P<0.05,P<0.01）。结论: PIO可保护ET-1引起损伤的心肌细胞,机制可能与抑制脂质过氧化有关。     

Role of mitochondria in cell apoptosis during hepatic ischemia-reperfusion injury and protective effect of ischemic postconditioning

AIM: To investigate the role of mitochondria in cell apoptosis during hepatic ischemia-reperfusion injury and protective effect of ischemic postconditioning (IPC). METHODS: A rat model of acute hepatic ischemia-reperfusion was established, 24 healthy male Wistar rats were randomly divided into sham-operated group, ischemia-reperfusion group (IR) and IPC group. IPC was achieved by several brief pre-reperfusions followed by a persistent reperfusion. Concentration of malondialdehyde (MDA) and activity of several antioxidant enzymes in hepatic tissue were measured respectively. Apoptotic cells were detected by TdT-mediated dUTP-biotin nick end labeling (TUNEL) and expression of Bcl-2 protein was measured by immunohistochemical techniques. Moreover, mitochondrial ultrastructure and parameters of morphology of the above groups were observed by electron microscope. RESULTS: Compared with IR group, the concentration of MDA and the hepatocellular apoptotic index in IPC group was significantly reduced (P<0.05), while the activity of antioxidant enzymes and OD value of Bcl-2 protein were markedly enhanced (P<0.05). Moreover, the injury of mitochondrial ultrastructure in IPC group was also obviously relieved. CONCLUSION: IPC can depress the synthesis of oxygen free radicals to protect the mitochondrial ultrastructure and increase the expression of Bcl-2 protein that lies across the mitochondrial membrane. Consequently, IPC can reduce hepatocellular apoptosis after reperfusion and has a protective effect on hepatic ischemia-reperfusion injury.     

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。     

Hepatoprotective effect of endogenous nitric oxide during ischemia-reperfusion in the rat

The aim of this study was to evaluate the protective or deleterious effects of endogenous nitric oxide (NO) on liver cells during hepatic ischemia-reperfusion (IR) in the rat. Injury to hepatocytes and endothelial cells was evaluated by determining cytolysis-marker activity in plasma (alanine transaminase [ALT]; aspartate transaminase [AST]) and plasma hyaluronic acid (HA) concentration. Clamping the hepatic pedicle for 45 minutes caused a significant increase in plasma AST and ALT activity after 30 minutes of reperfusion, which reached a maximum (+270% and +740%, respectively) after 6 hours of reperfusion. Plasma HA concentration was significantly higher (+130%) only after 6 hours of reperfusion. Administration of a nonselective NO synthase (NOS) inhibitor, Nomega-nitro-L-arginine (L-NNA; 10 mg/kg iv), 30 minutes before IR, caused marked aggravation of postischemic liver injury, as shown by plasma ALT and AST activity and HA concentration. This deleterious effect was partially prevented by the simultaneous injection of L-arginine, the endogenous NO precursor (100 mg/kg iv). Interestingly, L-arginine alone limited postischemic damage (AST, -25%; ALT, -45%; HA, -21% vs. untreated IR rats at 6 hours reperfusion). Pretreatment with the Guanosine 3':5'-cyclic monophosphate-independent vasodilator, prazosin, partially reversed L-NNA effects, but it did not protect untreated IR animals. Pretreatment with aminoguanidine, a selective inhibitor of inducible NOS, did not aggravate hepatic IR injury. Thus, endogenous NO, probably produced by an early and transient activation of a constitutive NOS, protects both hepatocytes and endothelial cells against liver ischemia-reperfusion injury, and this effect is not entirely a result of vasorelaxation.     

Alanyl-glutamine dipeptide inhibits hepatic ischemia-reperfusion injury in rats

AIM: To investigate the protective effect and mechanism of alanyl-glutamine dipeptide (Ala-Gln) against hepatic ischemia-reperfusion injury in rats. METHODS: Rats were divided into group C as normal control Group (n=16) and group G as alanyl-glutamine pretreatment (n=16). Rats were intravenously infused with 0.9% saline solution in group C and Ala-Gln -enriched (2% glutamine) 0.9% saline solution in group G via central venous catheter for three days. Then all rats underwent hepatic warm ischemia for 30 min followed by different periods of reperfusion. Changes in biochemical parameters, the content of glutathione (GSH) and the activity of superoxide dismutase (SOD) in liver tissue, Bcl-2 and Bax protein expression and morphological changes of liver tissue were compared between both groups. RESULTS: One hour after reperfusion, the levels of liver enzymes in group G were significantly lower than those in group C (P<0.05). Twenty-four hours after reperfusion, the levels of liver enzymes in both groups were markedly recovered and the levels of liver enzyme in group G were also significantly lower than those in group C (P<0.01). One and 24 h after reperfusion, GSH content in group G was significantly higher than that in group C (P <0.05). There was no statistical difference in activities of SOD between the two groups. One and 24 h after reperfusion, the positive expression rate of Bcl-2 protein was higher in group G than in group C (p<0.05) and the positive expression rate of Bax protein was lower in group G than in group C (P<0.05). Histological and ultrastructural changes of liver tissue were inhibited in group C compared to group G. CONCLUSION: Our results suggest that Ala-Gln pre-treatment provides the rat liver with significant tolerance to warm ischemia-reperfusion injury, which may be mediated partially by enhancing GSH content and regulating the expression of Bcl-2 and Bax proteins in the liver tissue.     

银杏叶提取物抗大鼠心肌缺血再灌注损伤的实验研究

目的探讨银杏叶提取物(GBE)对大鼠心肌缺血再灌注损伤(IMR)方面的预防和保护作用。方法MaleWistar大鼠30只,随机分为假手术组、模型组、GBE预处理组(GBE组),每组10只。检测各组血小板活化因子(PAF)、血栓素B2(TXB2)、丙二醛(MDA)和超氧化物歧化酶(SOD)活性的变化。结果与假手术组比较,模型组血中PAF、TXB2和MDA含量显著升高(P<0.05或P<0.01),SOD含量显著降低(P<0.01);GBE组血中TXB2含量升高(P<0.05),但PAF、SOD和MDA含量变化无统计学意义(P>0.05);与模型组比较,GBE组血中PAF、TXB2和MDA含量显著降低(P<0.01),SOD含量显著升高(P<0.01)。结论GBE对IMR有一定的防治和保护作用。     

Modulation of liver oxidant-antioxidant system by ischemic preconditioning during ischemia／reperfusion injury in rats

AIM: To investigate effects of ischemic pre-conditioning on the liver endogenous oxidant-antioxidant system during ischemia/reperfusion injury. METHODS: Twenty-four male Sprague-Dawley rats were randomly divided into sham-operated (Sham), ischemia/ reperfusion (I/R), ischemic pre-conditioning plus ischemia/ reperfusion (IPC) groups. Serum ALT, AST and hyaluronic acid levels were assayed and pathologic alterations observed. Liver malondialdehyde (MDA) contents, endogenous antioxidant enzymes, superoxidase dismutase (SOD), catalase (CAT), gultathionine peroxidase (GSH-Px) activities, neutrophils accumulation marker, myeloperoxidase (MPO) activities were measured respectively. RESULTS: Compared with I/R group, sinusoidal endothelial cells as well as hepatocytes damages, as assessed biochemically and histochemically, were improved significantly in IPC group; neutrophils infiltration was also markedly reduced. In IPC group, liver peroxidation, as measured by MDA contents, was significantly decreased when compared with I/R group; endogenous antioxidant enzymes, SOD, CAT and GSH-Px activities were markedly higher than that in I/R group. CONCLUSION: Ischemic pre-conditioning exerts protective effects on both hepatic sinusoidal endothelial cells and hepatocytes during liver I/R injury. Its mechanisms may involve dimunition of neutrophils infiltration and modulation of the imbalance of endogenous oxidant-antioxidant system in the organism.     

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.