黄体酮对大鼠局灶性脑缺血再灌注损伤后脑组织神经生长因子表达的影响

目的 观察黄体酮对大鼠局灶性脑缺血-再灌注损伤后缺血区皮层神经生长因子(NGF)和脑源性神经营养因子(BDNF)在mRNA与蛋白质水平表达的影响,探讨黄体酮在脑缺血-再灌注损伤中的脑保护作用机制. 方法 采用SD雄性大鼠局灶性脑缺血-再灌注损伤模型.将96只大鼠随机分为4组:假手术组、缺血再灌注组、溶剂组和黄体酮组各24只.应用Real time-PCR和Western blot技术分别对缺血区皮层NGF和BDNF mRNA与蛋白表达情况进行测定. 结果 在缺血区皮层,缺血2h再灌注6h后,缺血再灌注组NGF和BDNF的mRNA及蛋白质表达达高峰,再灌注24 h后,回复到假手术组水平;缺血2h再灌注12 h后,黄体酮组NGF和BDNF mRNA及蛋白表达达高峰,再灌注24 h后,表达仍高(P＜0.05). 结论 黄体酮可以使脑缺血-再灌注损伤后NGF和BDNF的mRNA表达上调,促进脑内NGF和BDNF蛋白的合成,从而发挥脑保护作用.     

成年大鼠心肌缺血再灌注后X染色体连锁凋亡抑制蛋白的动态表达变化

目的 测定心肌缺血再灌注过程中X染色体连锁凋亡抑制蛋白（XIAP）动态表达变化,探讨其与缺血再灌注损伤所致心肌细胞凋亡的关系.方法 将健康成年雄性SD大鼠随机分为两组,手术组和伪手术组,每组根据再灌注时间再分为6组：缺血30min,再灌注0、1、2、3、12、24 h组.采用半胱天冬酶-3（Caapaae-3）活性检测判定大鼠心肌细胞凋亡发生情况;用Western Blot和实时定量PCR技术分别检测各组心肌组织中XIAP的蛋白和基因表达水平.结果 Caspase-3活性从心肌缺血再灌注1 h开始升高,再灌注12 h活性最大,再灌注24 h趋于正常.心肌缺血再灌注3 h,XIAP蛋白表达开始降低,再灌注12 h表达最低;而XIAP的mRNA水平表达各组差异无统计学意义.结论 成年大鼠心肌缺血再灌注后Caspase-3活性增高可能与XIAP表达降低有关,提示XIAP表达降低可能参与了心肌缺血再灌注诱导的细胞凋亡.     

p38丝裂原活化蛋白激酶介导大鼠心肌缺血再灌注损伤信号传导的研究

目的:探讨p38丝裂原活化蛋白激酶(p38MAPK)在大鼠心肌缺血再灌注损伤中的作用.方法:健康成年雄性SD大鼠随机分为对照组、单纯缺血组、缺血再灌注组、抑制剂组,每组6只.抑制剂组于术前30 min腹腔注射p38MAPK抑制剂SB 203580(5 mg/kg体重).采用夹闭冠状动脉30 min后再灌注2 h的方法建立大鼠心肌缺血再灌注损伤动物模型.采用逆转录多聚合酶链反应(RT-PCR)检测p38MAPK信使核糖核酸(mRNA)表达,免疫组化法检测p-p38MAPK蛋白表达水平及心肌细胞凋亡率.结果:单纯缺血组与对照组比较,大鼠心肌组织中p-p38MAPK的蛋白含量增加,差异有统计学意义(P<0.01),p38MAPK mRNA的表达及细胞凋亡率也增加,但差异无统计学意义(P>0.05).缺血再灌注组与对照组比较,心肌组织中p38MAPK mRNA及p-p38MAPK蛋白水平和心肌细胞凋亡均显著增加,差异均有统计学意义(P<0.05～0.01).与缺血再灌注组比较,抑制剂组大鼠心肌组织p38MAPK mRNA及p-p38MAPK蛋白水平及心肌细胞凋亡均降低,(P<0.05~0.001),差异均有统计学意义.结论:p38MAPK的激活主要发生于再灌注过程;p38MAPK的活化可使缺血再灌注心肌细胞凋亡增加;抑制p38MAPK的活化可以减少缺血再灌注心肌细胞凋亡,减轻缺血再灌注所致的大鼠心肌损伤.     

环氧合酶2基因在大鼠脑缺血再灌注损伤中的表达及意义

目的探讨局灶性脑缺血再灌注损伤过程中环氧合酶2基因的表达及其意义。方法采用栓线法制备大鼠大脑中动脉缺血再灌注损伤模型。随机分为8组:假手术组,缺血2h组,缺血再灌注3h、6h、12h、24h、48h、72h组,每组10只。评定神经功能损伤,HE染色观察脑组织形态学改变。Northern blot、Western blot和免疫组织化学染色方法检测脑组织环氧合酶2 mRNA和蛋白产物表达。结果神经功能缺损表现随缺血再灌注时间的延长而逐渐加重。缺血2h组环氧合酶2 mRNA和蛋白产物表达比假手术组明显增加(P<0.01),再灌注后表达逐渐增强,再灌注12h环氧合酶2的mRNA表达达高峰(0.92±0.30),再灌注24h环氧合酶2的蛋白产物表达达高峰(0.72±0.18),与其它组比较差异有显著性(P<0.01)。结论环氧合酶2基因在局灶性脑缺血再灌注损伤中的表达呈动态变化过程,环氧合酶2可能与缺血再灌注后迟发性神经细胞死亡有关。     

大鼠心肌缺血/再灌注损伤心肌细胞凋亡与Fas、FasL基因表达的变化

目的：探讨大鼠实验性心肌缺血再灌注时心肌细胞凋亡与Fas及Fas蛋白配体（Fas Ligand,FasL）基因表达的变化及与心肌组织损伤的关系。方法：以穿线结扎或松扎左冠状动脉制备大鼠心肌缺血再灌注模型。64只大鼠随机分成假手术组（假手术24h）、缺血再灌注I组（缺血30min、再灌注24h）、缺血再灌注Ⅱ组（缺备30min、再灌注72h）及缺血再灌注Ⅲ组（缺血3h、再灌注24h）。以缺口末端标记法检测心肌细胞凋亡的变化,S－P免疫组化法分别检测Fas与FasL蛋白水平变化,采用逆转录聚合酶链反应法检测Fas基因mRNA的表达改变,并分析心肌组织病理学损伤程度。结果：心肌缺血再灌注后心肌细胞凋亡指数Fas蛋白阳性染色指数与炎性细胞FasL蛋白阳性染色指数均增加,且均随缺血或再灌注时间延长而进一步增高; Fas基因的mRNA表达也上调,但以再灌注24h时达高峰;心肌缺血再灌注后心肌组织呈大小不一的灶性坏死,坏死周围有爆炸性一细胞浸润。结论：心肌缺血再灌注时心肌细胞凋亡、Fas基因的蛋白与mRNA表达水平及炎性细胞的FasL蛋白表达量均增加,心肌细胞凋亡与Fas/FasL系统参与了心肌缺血再灌注损伤过程。     

大鼠局灶性脑缺血预处理后活化转录因子6 mRNA及其蛋白表达的变化

目的观察脑缺血预处理对大鼠脑缺血再灌注后活化转录因子6(ATF6)mRNA及其蛋白表达的影响。方法选择SD大鼠120只,随机分为假手术组、缺血再灌注组、缺血预处理组,每组40只,每组又按照再缺血后12h,1、2、3d分为4个时间点,每个时间点10只。采用二次线栓法制备大鼠局灶性脑缺血预处理模型,实时荧光定量PCR和免疫组织化学法观察再缺血后各个时间点ATF6mRNA及其蛋白的表达变化。结果与假手术组比较,缺血再灌注组ATF6mRNA及其蛋白表达均于缺血再灌注后12h开始明显上升,1d达高峰,随再灌注时间延长其表达逐渐下降,但仍保持较高表达水平(P<0.05,P<0.01);缺血预处理组各时间点ATF6mRNA及其蛋白表达水平较缺血再灌注组明显升高(P<0.05)。结论脑缺血预处理可能通过诱导ATF6表达发挥其神经保护作用。     

脑缺血再灌注后bcl-2、caspase-3 mRNA水平表达与大脑皮质及纹状体区炎性细胞浸润

目的探讨大鼠脑缺血再灌注后bcl-2蛋白、caspase-3 mRNA的表达及炎性细胞浸润与神经细胞凋亡的关系。方法将54只Wistar大鼠随机分为二组：假手术组，缺血再灌注组。采用原位末端标记(TUNEL)、免疫组化和原位杂交技术分别观察脑缺血再灌注后不同时间点神经细胞凋亡及损伤的变化与bcl-2、caspase-3 mRNA表达。结果bcl-2表达于缺血再灌注12～24h达高峰，再灌注2—4d呈下降趋势，至16d略高于假手术组；caspase-3 mRNA于缺血再灌注12—24h达高峰，2—4d呈降低趋势，至16d略高于假手术组。结论脑缺血再灌注后细胞凋亡介导神经细胞损伤、坏死是一个渐进的动态演变过程。bcl-2蛋白、caspase-3 mRNA表达在抑制细胞凋亡和介导神经细胞损伤等方面起非常重要的作用。     

香丹注射液对脑缺血再灌注大鼠细胞凋亡与FADD mRNA表达的影响

目的 研究香丹注射液对脑缺血再灌注大鼠细胞凋亡及其相关基因表达的影响.方法 线栓法制备脑缺血再灌注大鼠损伤模型,缺血2h后再灌注3、6、12、24h,采用TUNEL检测(原位末端转移酶标记技术)检测细胞凋亡,提取脑组织RNA检测Fas死亡结构域相关蛋白(FADD) mRNA的表达变化.结果 治疗组大鼠缺血再灌注后FADD mRNA表达水平较模型组均降低(P＜0.05),第24小时与假手术组比较无统计学意义(P＞0.05);治疗组大鼠凋亡细胞凋亡率较模型组明显降低(P＜0.01).结论 香丹注射液能降低脑缺血后脑组织中FADD mRNA蛋白的表达,减轻细胞凋亡.     

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.     

饱和氢盐水对心肌缺血再灌注损伤老年大鼠心肌细胞线粒体损伤的影响

目的探讨饱和氢盐水对心肌缺血再灌注损伤老年大鼠心肌细胞蛋白激酶C(PKC)/热休克蛋白90(HSP90)信号通路和线粒体损伤的影响。方法选取18月龄健康老年清洁级雄性SD大鼠150只,采用随机数字表法分为5组:空白对照组、假手术组、缺血再灌注组、饱和氢盐水组、生理盐水组,每组30只。HE染色观察心肌病理学。透射电镜观察线粒体超微结构。蛋白质印迹法和RT-PCR法检测心肌细胞PKC、HSP90、缝隙连接蛋白43(Cx43)、Cx45蛋白及PKC、HSP90、Cx43、Cx45mRNA表达。结果与空白对照组和假手术组比较,缺血再灌注组、饱和氢盐水组和生理盐水组大鼠心肌缺血再灌注后12h和24h心肌细胞线粒体损伤程度评分明显升高,PKC、HSP90、Cx43、Cx45蛋白及PKC、HSP90、Cx43、Cx45mRNA表达明显增加,差异有统计学意义(P0.05)。与缺血再灌注组和生理盐水组比较,饱和氢盐水组大鼠心肌缺血再灌注后12h和24h心肌细胞线粒体损伤程度评分明显降低[(1.34±0.12)分vs(2.54±0.28)分、(2.61±0.29)分,(1.27±0.13)分vs(2.57±0.27)分、(2.64±0.28)分,P0.05],PKC、HSP90、Cx43、Cx45蛋白及PKC、HSP90、Cx43、Cx45mRNA表达明显下调,差异有统计学意义(P0.05)。结论饱和氢盐水可减轻线粒体损伤,从而减轻老年大鼠心肌再灌注损伤。     

Protective function of tocilizumab in human cardiac myocytes ischemia reperfusion injury

Objective:To investigate the protective function of tocilizumab in human cardiac myocytes ischemia-reperfusion injury.Methods:The human cardiac myocytes were treated by tocilizumab with different concentrations(1.0 mg/mL,3.0 mg/mL,5.0 mg/mL) for 24 h.then cells were cultured in ischemia environment for 24 h and reperfusion environment for 1 h.The MTT and flow cytometry were used to detect the proliferation and apoptosis of human cardiac myocytes,respectively.The mRNA and protein expressions of Bcl-2 and Bax were measured by qRT-PCR and western blot,respectively.Results:Compared to the negative group,pretreated by tocilizumab could significantly enhance the proliferation viability and suppress apoptosis of human cardiac myocytes after suffering ischemia reperfusion injury(P0.05).The expression of Bcl-2 in tocilizumab treated group were higher than NC group(P0.05).while the Bax expression were lower(P0.05).Conclusions:Tocilizumab could significantly inhibit apoptosis and keep the proliferation viability of human cardiac myocytes after suffering ischemia reperfusion injury.Tocilizumab may obtain a widely application in the protection of ischemia reperfusion injury.     

大鼠心肌再灌注时心肌细胞凋亡,Fas基因表达及缺血预处理对？…

目的 探讨大鼠心肌缺血后不同再灌注时相心肌细胞凋亡,Ｆａｓ基因表达变化及血预处理的影响,方法 １０８只大鼠随分成假手术组（假手术２４小时）缺血３０分钟再灌注６,１２,２４,４８小时组及缺血预处理（ＩＰＣ）组（结扎冠脉５分钟,再灌注５分钟,重复３次后再行结扎冠脉３０分钟,再灌注６小时）口号档端标记法（ＴＵＮＥＬ）标记凋亡细胞,以Ｓ－Ｐ免疫组化及逆转录聚合酶链反应（ＲＴ－ＰＣＲ）法分别检测Ｆａｓ基因蛋     

大鼠急性脑缺血再灌注细胞凋亡调控因素的研究

目的　探讨 Bcl- 2及 Caspase- 3在脑缺血再灌注损伤中的表达及与缺血性凋亡的关系。方法　制备大鼠全脑缺血再灌注损伤模型。通过免疫组化及原位杂交显色方法测定 Bcl- 2、Caspase- 3在脑缺血再灌注损伤后随时间延长蛋白表达的动态变化 ,并用图像分析方法测定二者的免疫强度。结果　图像分析显示 Bcl- 2表达于缺血再灌注 3h后达高峰 ,再灌注 6 h后呈下降趋势 ,2 4 h后表达明显减少 ,与 3h相比 P<0 .0 1。Caspase- 3于缺血再灌注 6 h后达高峰 ,于再灌注 2 4 h后表达下降 ,与 6 h相比 P<0 .0 1。结论　 Bcl- 2及 Caspase- 3均介导了脑缺血再灌后神经细胞凋亡的发生 ,并可能参与迟发神经细胞死亡     

Differential-display polymerase chain reaction identifies nicotinamide adenine dinucleotide-ubiquinone oxidoreductase as an ischemia/reperfusion-regulated gene in cardiomyocytes

OBJECTIVE: Cardiac ischemia/reperfusion-induced oxidative damage often occurs in mitochondria. We identified differentially expressed genes in the canine heart after global cardiac ischemia/reperfusion injury was induced during cardiopulmonary bypass (CPB). METHODS: Differential-display polymerase chain reaction (ddPCR) was performed on cardiac tissue from canine hearts with or without global cardiac ischemia/reperfusion injury induced during CPB. Ischemia/reperfusion-associated mitochondrial injury was investigated at the protein level using various cardioplegic solutions and Western blot analysis. RESULTS: A mitochondrial protein nicotinamide adenine dinucleotide (NADH):ubiquinone oxidoreductase gene was identified on ddPCR. The NADH:ubiquinone oxidoreductase gene was up-regulated in canine hearts after 60 min of global cardiac ischemia/reperfusion injury during CPB. Western blot analysis revealed that, after manipulation with different cardioplegic solutions, increased Bcl-2 expression and decreased cytochrome c expression were associated with cardiomyocytic apoptosis. CONCLUSIONS: The NADH:ubiquinone oxidoreductase gene is up-regulated during global cardiac ischemia/reperfusion injury during CPB in canines. To our knowledge, involvement of this gene in global cardiac ischemia/reperfusion injury during CPB has not been described previously. The NADH:ubiquinone oxidoreductase gene may have a role in the regulation of molecular changes during the global cardiac ischemia/reperfusion injury during CPB, such as the up-regulation of Bcl-2, which might block release of cytochrome c from the mitochondria and prevent cardiomyocytic apoptosis.     

Effect of N—desulfated heparin on hepatic／renal ischemia reperfusion injury in rats

AIM：To invesigate the effect of N-desulfated heparin on hepatic/renal ischemia and reperfusion injury in rats.METHODS:Using rat models of 60minutes hepatic of renal ischemia followed by 1h,3h,6hand24h reperfusion.animals were randomly divided into following groups,the sham operated controls,ischemic group receiving only normal saline,and treated group receiving N-desulfated heparin at a dose of 12mg/kg at 5minutes before reperfusion.P-selectin expression was detected in hepatic/renal tissues with immunohistochemistry method.RESULTS:P-selectin expression,serumALT,AST,BUNand Cr levels were significantly increased during60minute ischemia and 1h,3h,6hand24hreperfusion.while the increment was significantly inhibited,and hepatic/renal pathology observed by light microscopy was remarkably improved by treatment with the N-desulfated heparin.Furthermore.the heparin was found no effects on PT and KPTT.CONCLUSION:P-selectin might mediate neutrophil infitration and contribute to hepatic/renai ischemia and reperfusion.THe N-desulfated heparin might prevent hepatic/renal admage induced by ischemia and reperfusion injury without significant anticoagulant activity.     

依达拉奉对大鼠局灶性脑缺血再灌注后Caspase—3蛋白表达的影响

目的在大鼠脑缺血再灌注损伤发生后,用自由基清除剂依达拉奉对其进行治疗,监测再灌注不同时间点脑组织Cas-pase-3蛋白表达情况。研究依达拉奉对脑缺血再灌注损伤的保护作用。方法制作短暂、局灶性脑缺血再灌注模型。分为正常组及假手术组(对照组)、脑缺血再灌注对照组(缺血组)、依达拉奉治疗组(治疗组),分别于缺血1h后进行再灌注。治疗组于再灌注后30min腹腔内及皮下各注射依达拉奉1次(按依达拉奉3mg/kg),30min后重复一次。设再灌注后2h、6h、12h、24h、48h不同时间点,各时间点以0.4%戊巴比妥钠深度麻醉后快速断头法将大鼠处死,以4%多聚甲醛灌注固定后取脑,行免疫组化检测各时间点脑组织Caspase-3表达阳性细胞数。结果缺血组再灌注后2h在大脑额叶和顶叶皮质和海马即可见到Caspase-3蛋白表达的阳性细胞,12h达高峰,24h后开始下降。治疗组各时间点Caspase-3表达水平较对照组明显降低(P<0.01)。结论依达拉奉可抑制Caspase-3的表达,对缺血再灌注损害的脑组织有明显的保护作用。     

Ischemia/Reperfusion Effects on Bladder Muscle and Mucosa Cell Contractile Regulatory Proteins

Objectives: Ischemia/reperfusion (I/R) has been shown to be the major etiologic factor in animal models in a variety of bladder dysfunctions. Herein we investigate the direct effect of I/R on rabbit bladder contractile regulatory proteins. Methods: Male rabbit bladders were subjected to IR. The contractile responses were recorded and the protein levels of rho‐kinase (ROK), caldesmon (CaD) and myosin light chain kinase (MLCK) were analyzed in both bladder muscle and mucosa. Results: For the mucosa layer, ROK was unchanged after ischemia, but increased significantly after 1 week of reperfusion. MLCK increased after ischemia and then significantly increased after 1 and 2 weeks of reperfusion. In the muscle layer, ROK increased at 2 h of reperfusion, decreased significantly following 1 week of reperfusion, then returned to control level by 2 weeks of reperfusion. MLCK expression significantly decreased as early as ischemia alone and did not recover after reperfusion. For CaD expression in the mucosa layer, both CaD isoforms significantly increased at 1 week of reperfusion, then progressively decreased at 2 weeks of reperfusion. In the muscle layer, both CaD isoforms had different expressions. In the muscle layer, smooth muscle caldesmon (h‐CaD) decreased at ischemia alone and at 2 h of reperfusion, but significantly increased at 2 weeks of reperfusion; whereas non‐muscle caldesmon (l‐CaD) significantly decreased at 2 weeks of reperfusion. Conclusion: As bladder muscle and mucosa have markedly different purposes, it is not surprising that they respond differently to I/R. Bladder mucosa and muscle have different kinds of alternations on contractile regulatory proteins.     

Inhibition of Rho-kinase protects the heart against ischemia/reperfusion injury

OBJECTIVE: To investigate the role of Rho A and Rho-kinase in acute myocardial ischemia/reperfusion injury and the protective effect of Rho-kinase inhibitor, Y-27632 [(R)-(+)-trans-N-(4-pyridyl)-4-(1-aminoethyl)cyclohexanecarboxamide]. METHODS AND RESULTS: Male CD1 mice were subjected to 30 min of coronary occlusion and 24 h reperfusion. Ischemia/reperfusion upregulated expression of Rho A in ischemic myocardium, and subsequently activated Rho-kinase. Y-27632 significantly inhibited the activation of Rho-kinase following ischemia/reperfusion. Treatment with Y-27632 at 10 and 30 mg/kg oral administration, reduced infarct size by 30.2% and 41.1%, respectively (P<0.01 vs. vehicle). Y-27632 also enhanced post-ischemia cardiac function. Left ventricular systolic pressure, +dP/dt and -dP/dt were significantly improved by 23.5%, 52.3%, and 59.4%, respectively (P<0.01 vs. vehicle). Moreover, Y-27632 reduced ischemia/reperfusion-induced myocardial apoptosis. The apoptotic myocytes in ischemic myocardium after 4 h reperfusion were reduced from 13.1% in vehicle group to 6.4% in Y-27632-treated group (P<0.01). Meanwhile, ischemia/reperfusion-induced downregulation of Bcl-2 in myocardium was remarkably attenuated in the treated animals. Ischemia/reperfusion resulted in remarkable elevation in serum levels of proinflammatory cytokines, interleukin-6 (IL-6), keratinocyte chemoattractant (KC) and granulocyte colony-stimulating factor (G-CSF), which was significantly suppressed by Y-27632. In addition, Y-27632 decreased ischemia/reperfusion-induced accumulation of neutrophils in the heart by 45% (P<0.01). CONCLUSIONS: These results suggest that Rho-kinase plays a pivotal role in myocardial ischemia/reperfusion injury. The cardiac protection provided by treatment with a selective Rho-kinase inhibitor is likely via anti-apoptotic effect and attenuation of ischemia/reperfusion-induced inflammatory responses. The finding of this study suggest a novel therapeutic approach to the treatment of acute myocardial ischemia/reperfusion injury.     

老龄大鼠脑缺血再灌注损伤与明胶酶系基因表达的关系

目的研究老龄大鼠脑缺血再灌注不同时期微血管基底膜损伤与明胶酶系基因表达的关系。方法制备SD雄性大鼠局灶性脑缺血再灌注模型,将56只青年大鼠分为青年假手术组、青年模型组,56只老龄大鼠分为老龄假手术组、老龄模型组,其中青年与老龄模型组又分缺血3h和再灌注6、12、24h,3、6天时间点。观察脑微血管结构基底膜病理形态变化和明胶酶系的基因表达变化。结果老龄假手术组大鼠脑皮质微血管结构基本正常,老龄模型组与同时间点青年模型组比较病理损伤较重。随再灌注时间的延长,基质金属蛋白酶-2(MMP-2)mRNA表达递增,基质金属蛋白酶-9(MMP-9)mRNA和金属蛋白酶组织抑制-1(TIMP-1)mRNA表达呈先增强后降低趋势。与青年模型组相同时间点比较,老龄模型组MMP-2、MMP-9mRNA表达水平增强;TIMP-1mRNA仅在再灌注24h表达水平降低,差异均有显著性。结论随着增龄,大鼠脑微血管基底膜损伤改变与MMPmRNA、TIMPmRNA的变化有关。老龄大鼠较青年大鼠病理损伤严重。