高血糖对大鼠脑缺血再灌注后碱性成纤维因子表达的影响

目的观察高血糖条件下大鼠脑缺血再灌注后碱性成纤维细胞生长因子（basic fibroblast growth factor,bFGF）表达的情况。方法以链脲佐菌素诱导产生实验性糖尿病大鼠,饲养6周左右,经测定血糖〉16.7mmol/L确定糖尿病模型的建立。以线栓法制作大鼠脑缺血再灌注模型,进行梗死体积测定,采用免疫组化方法观察大鼠脑缺血再灌注6h、12h、24h、48h时程bFGF的表达情况,比较糖尿病大鼠及正常大鼠脑缺血再灌注后脑内bFGF的表达的差异。结果（1）相同时间点糖尿病组大鼠脑梗死体积明显大于正常血糖组。（2）正常血糖组大鼠及糖尿病组大鼠脑缺血后bFGF的表达均增加,糖尿病组大鼠脑缺血再灌注后各时间点bFGF的表达均低于正常血糖组（P〈0.01）。结论脑缺血再灌注损伤可以诱导bFGF表达增强,提示bFGF对缺血性脑损伤有保护作用。糖尿病加重了大鼠脑缺血再灌注损伤,造成bFGF的表达不足。     

大鼠脑缺血再灌注模型粘附分子VCAM-1表达的研究

目的 探讨血管内皮细胞粘附分子（vascular cell molecule-1,VCAM-1)在脑缺血再灌注损伤中的作用和机制。方法 制作大脑中动脉梗死模型。分别于再灌注后6h,24h,36h,48h和7d5个时相点用免疫组化方法观察大鼠模型脑缺血区域VCAM-1的表达，并与永久性脑梗死，假手术组和正常大鼠组比较。结果 （1）正常对照组无VCAM-1的表达，假手术组在6h,24h,36h和48h均无VCAM-1的表达；（2）永久性脑梗死组6h后，在梗死周边区大脑微血管内皮细胞上和神经元上有VCAM-1的明显表达，24h表达达高峰，36-48h开始减弱，7d后完全消失；（3）缺血再灌注组6h后，在缺血周边区大脑神经元上和微血管内皮细胞上有较弱表达，24-48h达高峰，7d后在内皮细胞上仍有VCAM-1的持续表达。结论 缺血再灌注模型脑缺血区域有VCAM-1的表达，VCAM-1可能是缺血再灌注损伤的机制之一。     

局部亚低温对大鼠脑缺血后凋亡细胞及谷氨酸转运体、亲代谢型谷氨酸受体表达的影响

目的 探讨亚低温对大鼠局灶性脑梗死后凋亡细胞及谷氨酸转运体(GLT-1)和亲代谢型谷氨酸受体(mGluR2/3)表达的影响.方法 88只大鼠随机分为亚低温组、常温组、对照组.制备一侧永久性大脑中动脉阻塞(pMCAO)模型.亚低温组应用贴敷式局部亚低温治疗仪将病灶侧脑部温度降至(33±0.5)℃并持续3 h,常温组保持全身温度在(37±0.5)℃.在脑缺血后3 h、6 h、12 h、24 h、3 d、7 d用Western印迹法检测各组病灶周围大脑皮质GLT-1和mGluR2/3表达;在脑缺血后6 h、24 h、3 d、7 d用末端标记(TUNEL)法检测凋亡细胞.结果 亚低温组在脑缺血后24 h、3 d,常温组在脑缺血后24 h、3 d、7 d脑梗死灶周围凋亡细胞与脑缺血后6 h比较差异有统计学意义(均P＜0.01).在脑缺血后24 h、3 d、7 d,亚低温组凋亡细胞明显少于常温组(均P＜0.01).与对照组相比,亚低温组大鼠脑缺血后3 h、6 h、12 h GLT-1表达增加,24 h、3 d、7 d减少;常温组大鼠脑缺血后3 h GLT-1表达增加,24 h、3 d、7 d减少(均P＜0.05).在脑缺血后6 h、12 h、7 d,亚低温组GLT-1表达显著高于常温组(均P＜0.05).与对照组相比,亚低温组和常温组在脑缺血后3 h、6 h、12 h、24 h、3 d mGluR2/3表达均明显增加(均P＜0.05).在脑缺血后3 h、6 h、24 h、3 d,亚低温组mGluR2/3表达显著高于常温组(均P＜0.05).结论 亚低温能促进脑缺血后星形胶质细胞mGluR2/3和GLT-1的表达,减少脑梗死后神经元凋亡.     

阻断大脑中动脉建立大鼠局灶性脑缺血致MODS动物模型

目的探讨线栓法阻断大脑中动脉（MCA）建立大鼠局灶性脑缺血致多器官功能障碍综合征（MODS）动物模型的可行性。方法参照Longa等的线栓法，采用阻断大鼠MCA后再灌注法建立大鼠局灶性脑缺血致MODS模型。按随机化原则将54只Wistar大鼠分为3个组：正常对照组（n=6）、假手术组（n=6）及缺血再灌注后7个亚组（2h、6h、12h、24h、48h、72h、5d），每亚组6只。记录各组大鼠各时相点的症状、体征及体温、呼吸；检测外周血白细胞计数、血糖、肝功和肾功；光镜下观察脑与各器官组织的病理变化，依据全身炎症反应综合征（SIRS）和MODS的诊断标准，判断SIRS和MODS的发病率。结果（1）缺血组大鼠的体温、呼吸、谷丙转氨酶、尿素氮、肌酐、血糖变化与正常组、假手术组相比有显著差异，24～72h达到高峰。（2）大鼠脑缺血后各时相点的肺、肝、小肠及肾组织均有不同程度的病理损害。（3）大鼠急性脑缺血后SIRS的发生率为100％，MODS的发生率为57．1％。结论阻断MCA可成功建立大鼠局灶性脑缺血致MODS的动物模型。     

IGF-1对大鼠局灶性脑损伤c—los表达的影响

目的研究胰岛素样生长因子-1（IGF-1）对大鼠局灶性脑缺血再灌注后c-los表达的影响及与缺血时间关系，探讨IGF-1对脑缺血再灌注损伤的保护作用。方法制作SD大鼠大脑中动脉缺血再灌注模型。将55只SD雄性大鼠随机分为假手术组（n=5）、对照组（n=25）、IGF-1治疗组（n=25），其中后2组按缺血再灌时间（6h、12h、1d、3d、7d）不同可分为5个亚组，每组5只，治疗组于缺血2h再灌注1h后经腹腔注入40μg／kg稀释为1ml的IGF-1，假手术组及对照组同时腹腔注入生理盐水1ml。以上动物均在再灌注后规定时间点用4％多聚甲醛经心脏灌注固定，取大鼠脑组织，应用免疫组化S-P法和HE染色检测c-fos蛋白表达及脑组织结构病理变化。结果与对照组相比，治疗组大鼠脑组织c-fos表达明显减少，神经细胞坏死程度明显减轻。结论IGF-1在大鼠局灶性脑缺血再灌注损伤中起保护作用，其作用机制包括降低c-fos的表达，发挥神经保护作用。     

高血糖对大鼠脑缺血再灌注后碱性成纤维因子表达的影响

目的 观察高血糖条件下大鼠脑缺血再灌注后碱性成纤维因子(basic fibroblast growth factor,bFGF)表达的情况.方法 以链脲佐菌素诱导产生实验性糖尿病大鼠,饲养6周左右,经测定血糖＞16.7mmol/L确定糖尿病模型的建立.以线栓法制作大鼠脑缺血再灌注模型,进行梗死体积测定,采用免疫组化方法观察大鼠脑缺血再灌注6h,12h,24h,48h时程bFGF的表达情况,比较糖尿病及正常大鼠脑缺血再灌注后脑内bFGF的表达的差异.结果 (1)相同时间点糖尿病组梗死体积明显大于正常血糖组.(2)正常血糖组大鼠及糖尿病组大鼠脑缺血后bFGF的表达均增加,糖尿病组脑缺血后各时间点bFGF的表达均低于正常血糖组(P＜0.01).结论 脑缺血再灌注损伤可以诱导bFGF表达增强,提示bFGF对缺血性脑损伤有保护作用.糖尿病加重了大鼠脑缺血再灌注损伤,造成bFGF的表达不足.     

亚低温对局灶性脑缺血大鼠模型C3表达的影响

目的观察亚低温（32～35℃）对局灶性脑缺血后大鼠脑组织C3表达的影响。方法 100只大鼠随机分成假手术组、常温组和亚低温组,各组根据观察时间点分为术后6h、1d、2d、3d、7d五个亚组。建立大鼠左侧大脑中动脉闭塞（MCAO）模型,应用冰袋降温的方法使亚低温组大鼠肛温10min内降至（33℃±1℃）,维持低温6h后复温。假手术组和常温组大鼠保持肛温（37℃±0.5℃）。在各时间点采用神经缺陷评分对各大鼠进行神经功能评分后断头取脑,行苏木素伊红染色观察脑缺血病理学改变,免疫组织化学染色观察不同时间点C3表达情况。结果假手术组大鼠清醒后无神经功能障碍,常温组及亚低温组大鼠清醒后均出现左侧Horner征及不同程度右侧前肢为重的偏瘫,两组大鼠神经功能缺损3d时最明显,7d时均有所减轻。除6h外各时间点亚低温组大鼠神经功能缺损评分均较常温组低（P〈0.05）,各时间点亚低温组大鼠脑组织病理学损伤较常温组轻。在各时间点假手术组大鼠脑组织中C3可见少许表达,各组间比较差异无统计学意义（P〉0.05）。常温组和亚低温组大鼠缺血侧脑组织于缺血后6h补体C3阳性细胞数均开始增加,至3d均达到高峰,到7d时C3阳性细胞数明显减少,与常温组相比,亚低温组各时间点缺血侧脑组织C3表达明显减少（P〈0.05）。结论脑缺血时,缺血侧脑组织C3有表达,亚低温可使C3表达减少。亚低温可能通过降低C3的表达减轻补体级联反应起脑保护作用。     

大鼠脑缺血再灌后凝血酶与PAR-1的表达及意义

目的探讨大鼠脑缺血再灌后凝血酶（thrombin）及蛋白酶活化受体-1（PAR-1）的表达变化及意义。方法栓线法制作大鼠大脑中动脉闭塞再灌注模型,用Western Blot方法检测对照组及脑缺血2h再灌注不同时程组（12、24h,3、7d）凝血酶和PAR1蛋白表达水平。结果对照组可以检测到少量凝血酶（thrombin）和PAR-1的表达,两种蛋白于再灌注12h显著上升。3d达高峰（P〈0．01）,7d下降;缺血再灌注后凝血酶与PAR-1的表达呈高度正相关（r=0．934,P〈0．01）。结论凝血酶和PAR-1蛋白的表达增加可能与脑缺血冉灌注损伤的发病机制有关;凝血酶可能通过激活PAR-1参与了再灌注损伤的病理生理过程。     

大鼠脑缺血再灌注后胰岛素样生长因子－1的表达及意义

目的 观察胰岛素样生长因子-1（IGF-1）在大鼠脑缺血再灌注后在缺血不同部位的表达及组织病理学改变，探讨其对神经元的保护作用。方法 72只清洁级、成年健康雄性SD大鼠随机等分为假手术对照（sham）组和脑缺血再灌注（CIR）组，CIR组缺血3 h后，按再灌注时间的长短不同分为0、6、24、48、72 h和7 d 6个亚组，每亚组均为6只大鼠。于各相应时间点以Longa法、Berderson法和平衡木法分别进行行为学评分后处死动物，制做脑组织病理切片，苏木精-伊红染色后观察组织病理学改变，采用免疫组织化学方法测定IGF-1的动态表达变化。结果 （1）大鼠在大脑中动脉阻断后手术对侧肢体存在不同程度瘫痪，24 h后行为学评分结果逐渐趋于稳定,根据观察大鼠病变对侧肢体出现不同程度的瘫痪，其功能异常程度与病变严重程度一致；（2）除假手术对照（sham）组外，其余各组在脑梗死后6 h局部可见少量散在炎性细胞浸润，梗死后48 h炎性细胞浸润明显增多，并持续到7 d；（3）IGF-1在sham组神经元中呈弱阳性表达（灰度值127±6）；CIR组各缺血时段IGF-1表达分别为147±5（0 h）、153±6（6 h）、170±7（24 h）、169±5（48 h）、150±6（72 h）和147±5（7 d）。其中，缺血3 h及缺血3 h再灌注6 h组中心区、半影区阳性细胞数均增多，表达增强；随再灌注时间延长，中心区表达接近正常水平，半影区阳性细胞数增多，表达呈持续升高趋势，再灌注24 h和48 h达高峰，72 h表达有所下降，但仍表达高水平。结论 高表达的IGF-1参与了脑缺血再灌注后内源性神经保护过程，IGF-1在缺血半影区与中心区的演变病理生理中起重要作用，说明IGF-1对缺血半影区的保护作用。     

局灶性脑缺血大鼠海马CA3区EPO和STAT-5的表达

目的观察局灶性脑缺血后大鼠海马CA3区促红细胞生成素（EPO）和信号传导转录活化因子5（STAT-5）的表达规律，探讨EPO和STAT-5在脑缺血损伤过程中的作用。方法采用线栓法制备大鼠大脑中动脉局灶性脑缺血模型，SD大鼠随机分为假手术组和脑缺血组，后者又分为2、12、24h三个亚组，免疫组化法检测各组大鼠海马CA3区EPO和STAT-5的表达水平。结果（1）脑缺血组各时间点大鼠海马CA3区EPO和STAT-5的表达水平均较假手术组明显增高（P％0．01）；（2）脑缺血组大鼠海马CA3区EPO和STAT-5阳性细胞数在2h明显增加；12h达到高峰，24h下降；（3）脑缺血组各时间点EPO和STAT-5表达水平同步增减。结论EPO有可能是通过EPOR-JAK2-STAT-5信号转导途径对缺血性脑损伤发挥保护性作用。     

大鼠局灶性脑缺血半暗带葡萄糖转运子3 mRNA的表达

目的 研究大鼠局灶性脑缺血不同缺血时间皮质半暗带和中心区葡萄糖转运子3（GLUT3）转录水平的表达规律。方法 用插线法建立大鼠局灶性脑缺血模型，剥取缺血半暗带及中心区皮质组织，采用逆转录-聚合酶链反应（RT-PCR），测定GLUT3mRNA水平的变化。结果 缺血半暗带GLUT3mRNA在缺血3小时升高，24小时达到高峰，96小时后基本恢复正常。缺血中心区GLUT3mRNA在缺血后3小时有一短暂的升高，随后迅速下降呈低水平表达。结论 GLUT3在缺血半暗带的表达上调，有可能是机体对缺血损伤的保护性反应。     

大鼠短暂性脑缺血后葡萄糖转运子3表达变化

目的 研究大鼠短暂性脑缺血葡萄糖转运子3（GLUT3）转录水平表达规律。方法 用插线法建立大鼠短暂性脑缺血模型。剥取缺血半暗带及中心区皮质组织,采用半定量逆转录-聚合酶链式反应（RT-PCR）,测定不同再灌注时间GLUT3mRNA水平的变化。结果 再灌注3h缺血半暗区GLUT3mRNA3h升高,48h达到高峰,再灌注1周后仍高于正常。结论 再灌注后,缺血半暗带GLUT3的表达明显上调,有可能是机体抗损伤性反应。     

水通道蛋白4在大鼠脑缺血再灌注损伤中的作用

目的研究水通道蛋白4(AQP4)在缺血再灌注损伤大鼠脑内表达及作用。方法以大脑中动脉线栓法建立大鼠缺血再灌注模型,采用干湿法测定模型的脑组织含水量及伊文氏蓝含量;免疫蛋白印记(WesternBlot)技术分析在缺血再灌注不同时程脑内AQP4的表达情况,以及AQP4与脑含水量和伊文氏蓝水平的相关性,并与对照组比较。结果与对照组相比,实验组大鼠脑组织含水量及伊文氏蓝水平在缺血再灌注后不同时间点明显高于对照组(P<0.05～0.01);AQP4蛋白表达明显增高(均P<0.05),并随着缺血再灌时间的延长,其表达量亦逐渐增加,在再灌后24～48h达到高峰。缺血再灌注后AQP4脑内的表达与脑组织含水量及伊文氏蓝水平呈正相关(r=0.38、r=0.45,均P<0.05)。结论AQP4的高表达参与了脑缺血再灌注后继发的血脑屏障的开放和脑水肿的发生,是脑水肿产生的重要分子基础。     

Matrix metalloproteinase-9 expression and blood brain barrier permeability in the rat brain after cerebral ischemia/reperfusion injury

BACKGROUND: The integrity of the blood brain barrier (BBB) plays an important role in the patho-physiological process of cerebral ischemia/reperfusion injury. It has been recently observed that metalloproteinase-9 (MMP-9) is closely related to cerebral ischemia/reperfusion injuryOBJECTIVE: This study was designed to observe MMP-9 expression in the rat brain after cerebral ischemia/reperfusion injury and to investigate its correlation to BBB permeability.DESIGN, TIME AND SETTING: This study, a randomized controlled animal experiment, was performed at the Institute of Neurobiology, Central South University between September 2005 and March 2006.MATERIALS: Ninety healthy male SD rats, aged 3-4 months, weighing 200-280g, were used in the present study. Rabbit anti-rat MMP-9 polyclonal antibody (Boster, Wuhan, China) and Evans blue (Sigma, USA) were also used.METHODS: All rats were randomly divided into 9 groups with 10 rats in each group: normal control group, sham-operated group, and ischemia for 2 hours followed by reperfusion for 3,6,12 hours, 1,2,4 and 7 days groups. In the ischemia/reperfusion groups, rats were subjected to ischemia/reperfusion injury by suture occlusion of the right middle cerebral artery. In the sham-operated group, rats were merely subjected to vessel dissociation. In the normal control group, rats were not modeled.MAIN OUTCOME MEASURES: BBB permeability was assessed by determining the level of effusion of Evans blue. MMP-9 expression was detected by an immunohistochemical method.RESULTS: All 90 rats were included in the final analysis. BBB permeability alteration was closely correlated to ischemia/reperfusion time. BBB permeability began to increase at ischemia/reperfusion for 3 hours, then it gradually reached a peak level at ischemia/reperfusion for 1 day, and thereafter it gradually decreased. MMP-9 expression began to increase at ischemia/reperfusion for 3 hours, then gradually reached its peak level 2 days after perfusion, and thereafter it gradually decreased.CONCLUSION: MMP-9 expression increases in rat brain tissue after focal cerebral ischemia/reperfusion injury, which correlates with increased permeability of the BBB.     

脑缺血后尼膜同对AQP9 mRNA表达和血脑屏障通透性的影响

目的 研究脑缺血后尼膜同对AQP9 mRNA表达和血脑屏障通透性的影响以及脑缺血后尼膜同对脑的保护作用.方法 采用阻断大鼠大脑中动脉制作脑缺血大鼠模型,通过原位杂交和图像分析方法测定梗死区AQP9 mRNA的表达水平,同时电镜进行对应部位的病理观察,并检测缺血脑组织中伊文思蓝外渗的量.结果 脑缺血后,在尼膜同组和对照组缺血组织均出现缺血性病理变化、AQP9 mRNA表达上调、血脑屏障通透性增加,其变化趋势一致,随着脑缺血时间延长其改变加重.尼膜同组AQP9 mRNA的表达变化与生理盐水对照组,虽有差别,但差异无显著性意义(P>0.05);尼膜同组血脑屏障通透性及病理变化明显低于生理盐水对照组,其差异有显著性意义(P<0.05).结论 脑缺血后,尼膜同可能阻滞血脑屏障通透性的增加,起到脑保护作用,但不影响AQP9 mR-NA的表达.

Abstract：

Objective The aim of the study was to investigate the effect of Nimotop on the expression of AQP9 mRNA and the changes of BBB penetrability, as well as the effect of Nimotop on the brain after cerebral ischemia in rats.Methods The model of cerebral ischemia was made by occluding unilateral middle cerebral artery(MCA) of the rats with the suture method. The expression of AQP9 mRNA was assessed by in situ hybridization and imaging analysis. The pathological changes of the ultrastructure were observed under TEM. The BBB permeability of ischemic brain was determined by Evans Blue (EB) extravasation method. Results In Nimotop groups, the expression of AQP9 mRNA, the increasing of BBB permeability and the ultrastructure changes of the tissues were as same as those in control groups. The changes of two groups became remarkable after cerebral ischemia. Changes of AQP9 mRNA expression in Nimotop group were as same as those in control groups(P > 0.05) ;BBB permeability and the uhrastructure changes were more slight in Nimotop group than in control group (P < 0. 05). Conclusion Nimotop could decrease the permeability of BBB and brain damage after cerebral ischemia. However, Nimotop had no effect on the expression of AQP9 mRNA.     

Age-related alteration in cerebral blood flow and energy failure is correlated with cognitive impairment in the senescence-accelerated prone mouse strain 8 (SAMP8)

Cerebrovascular dysfunction is an early pathogenic event in Alzheimer’s disease (AD) and plays a key role in the disease process. Cerebral hypoperfusion, brain glucose hypometabolism and disrupted blood–brain barrier (BBB) integrity contributed to the onset and progression of AD. However, the relationships between the age-related cognitive impairment and cerebral blood flow (CBF), energy metabolism and BBB have not been clearly explained. In this study, we investigated the cognitive function, CBF, BBB damage and expression level of glucose transporter (GLUT) 1 and 3 of senescence-accelerated mouse prone 8 (SAMP8), and the correlations between each of them were analyzed. When compared with SAMR1 (senescence-accelerated mouse resistant 1), the cognitive abilities of SAMP8 were damaged apparently even at 4 months of age, showing up a slower and more capricious acquisition in Morris water maze tasks. In both SAMP8 and SAMR1, reduced CBF and increased BBB leakage were observed with increasing age, but an earlier and more severe impairment was detected in SAMP8. In addition, alterations of GLUT1 and GLUT3 protein expression in cortex and hippocampus were more prominent in SAMP8. Correlation analysis demonstrated that the increased escape latency was correlated negatively with CBF and expression of glucose transporters; and positively with BBB permeability in the hippocampus. These results suggested that CBF, BBB integrity, the expression of GLUT1 and GLUT3 were significantly affected by age and strain, which were also closely associated with cognitive ability. The alteration in CBF and energy failure induced by aging and vascular insults resulted in cognitive decline in SAMP8.     

17beta-Estradiol attenuates blood-brain barrier disruption induced by cerebral ischemia-reperfusion injury in female rats

Disruption of blood-brain barrier (BBB), mediated through matrix metalloproteinases (MMPs), is a critical event during cerebral ischemia. While neuroprotective effects of estrogens have been well established in ischemic stroke models, the effects of estrogens on BBB integrity remain to be elucidated. In the present study, we determined effects of 17beta-estradiol (E2) on BBB disruption induced by transient focal cerebral ischemia and its effects on MMP2 and MMP9 activation. Transient cerebral ischemia was induced by middle cerebral artery (MCA) occlusion for 1 h followed by reperfusion in ovariectomized rats. E2 (100 microg/kg) or vehicle was administered 2 h before MCA occlusion. BBB integrity was determined by fluorescent detection of extravasated Evans blue. In separate experiments, effect of E2 on MMP2 and MMP9 expression and activation was determined by immunoblot and MMPs activity assay. E2 treatment prevented more than 50% and 30% of BBB disruption in the ischemic cortex and subcortex at 4 h after reperfusion, respectively. MMP2 and MMP9 expression was elevated at 2 h and peaked at 4 h after reperfusion in the ischemic cortex, which was markedly reduced by E2 treatment. E2 treatment also attenuated the increase of MMPs activity induced by ischemia-reperfusion injury. In conclusion, estrogens could attenuate BBB disruption induced by transient cerebral ischemia, by inhibition of MMP2 and MMP9 activation. Our results suggest an important role of estrogens as multiple targeting protectants against ischemic stroke on cellular as well as vascular components of central nervous system.     

围产期脑缺氧缺血对葡萄糖转运蛋白表达的调控机制研究进展

葡萄糖转运蛋白 1(glucosetransporter 1,GLUT1)与葡萄糖转运蛋白 3(glucosetransporter 3,GLUT3)是脑内负责葡萄糖转运的两个重要蛋白质 ,不同的葡萄糖浓度可调节GLUT1和GLUT3的生成量。近来研究显示 ,缺氧缺血也是调控GLUT1和GLUT3的基因表达和产物合成的重要因素 ,由此影响脑的能量代谢 ,甚至导致能量衰竭。本文将围绕GLUT1和GLUT3的结构、功能、表达时相以及围产期脑缺氧缺血对脑内GLUT1和GLUT3的影响和调控作一综述。     

糖酐酯对脑栓塞大鼠溶栓治疗影响的研究

目的　观察糖酐酯对脑栓塞大鼠白细胞浸润的抑制作用及对溶栓治疗后梗死灶体积、细胞凋亡等的影响。方法　用自体血栓子栓塞大鼠大脑中动脉 0 .5h后 ,静脉给予糖酐酯或生理盐水 ,2h或 4h后应用尿激酶溶栓治疗 ,12h或 2 4h后 ,采用TTC染色测定梗死灶大小 ,免疫组化法检测白细胞浸润和细胞间黏附分子 1(ICAM 1)表达 ,TUNEL法检测细胞凋亡 ,透射电镜观察血脑屏障 (BBB)及细胞坏死。结果　联合溶栓组与单纯溶栓组比较 ,梗死灶减小 (P <0 .0 5 ) ,缺血周边区浸润白细胞数和凋亡细胞数明显减少 (均P <0 0 1) ,BBB损伤及细胞坏死程度减轻 ,颅内出血发生例数减少。但ICAM 1表达两组比较无显著性差异 (P >0 0 5 )。结论　糖酐酯能明显抑制白细胞浸润 ,其作用机制与ICAM 1表达无关 ;抑制白细胞浸润可以增强溶栓治疗疗效、保护BBB和减少溶栓治疗后神经细胞凋亡。