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1.
目的 研究大鼠脑组织缺血再灌注后星形胶质细胞与GAP-43变化的关系.方法 建立局灶性脑缺血再灌注模型.72只大鼠随机分为假手术组、缺血再灌注组,在各时间点处死取脑,应用免疫组化法检测海马CA1区GFAP、GAP-43的表达.结果 不同时间点缺血再灌注组GFAP、GAP-43表达均高于同时期假手术组(P<0.01);缺血再灌注组GFAP与GAP-43高度相关(P<0.05).结论 脑缺血再灌注后,海马CA1区星形胶质细胞与GAP-43变化具有高度相关性.  相似文献   

2.
目的探讨慢性脑缺血大鼠海马CA1区微血管LRP—1表达与认知功能改变的相关性。方法应用双侧颈动脉结扎的方法制作SD大鼠慢性缺血模型;Morris水迷宫对大鼠的认知功能进行测试;免疫组化技术测定海马CA1区微血管LRP-1,Ⅷ因子相关抗原及GFAP的表达;放免技术对脑脊液Aβ蛋白的浓度进行测定。采用 MIAS图像分析系统对免疫组化结果进行平均光密度测定及微血管计数。结果术后1个月手术组大鼠认知功能已明显下降,寻找平台所需游走的距离较假手术显著延长。术后6个月手术组大鼠海马CA1区微血管LRP-1的表达较假手术组大鼠显著降低;GFAP的表达显著增强;但VIII因子相关抗原的表达及微血管计数两组之间无显著差异。微血管LRP-1表达与水迷宫成绩呈负相关。手术组大鼠脑脊液Aβ蛋白含量较假手术组显著下降。结论慢性缺血过程中,大鼠认知功能下降与海马CA1区微血管LRP-1的表达下降有显著相关性。  相似文献   

3.
目的 探讨腺苷预处理对脑缺血再灌注损伤脑内星形胶质细胞的影响.方法 制作大鼠脑缺血再灌注损伤模型.60只SD大鼠随机分为3组:假手术组(F组)、缺血再灌注组(IR组)、腺苷预处理组(AP组),再按缺血再灌注后不同时间把各组随机分成4个亚组,每组5只大鼠.应用Zeal Longa 5级评分法进行神经功能评分,并通过免疫组织化学法检测脑组织内胶质纤维酸性蛋白(glial fibrillary acid protein,GFAP)的表达.结果 (1)神经功能评分AP组各亚组均小于IR组各亚组(P均<0.05),但大于F组各亚组(P均<0.05);(2)F组GFAP阳性表达均较弱,IR组和AP组在脑缺血再灌注后2h开始出现GFAP阳性表达的细胞数量增多,AP组在6h、24h AP组GFAP阳性表达比IR组增强(P均<0.05),在72h时AP组GFAP阳性表达较IR组减少(P<0.05).结论 腺苷预处理能在大鼠局灶性脑缺血再灌注损伤早期阶段促进GFAP的表达,72h后抑制GFAP的过度表达.  相似文献   

4.
癫痫大鼠海马神经元和星形胶质细胞的病理演变   总被引:5,自引:1,他引:5  
目的 探讨癫痫大鼠海马神经元和星形胶质细胞在点燃后各期的病理特点、时序及机制。方法 针对匹罗卡品癫痫大鼠模型,行Nissl、免疫组化和HE染色,观察海马神经元及星形胶质细胞的病理变化。结果 癫痫持续状态后超急性期(4h),CA3区神经元呈嗜酸性变性、胞浆深染;急性期(24h),嗜酸性变性最为显著,神经元固缩、核仁消失、突起断裂,星形胶质细胞水肿;缄默期(7d),CA3、CA1区及门区神经元大量坏死、脱失,胶质增生肥大,海马构筑紊乱;慢性期(6w),CA3、CA1区出现胶质瘢痕,遗有形态正常的神经元,且颗粒细胞层增厚。结论 癫痫时海马神经元先于星形胶质细胞发生病理改变,二者均参与癫痫发生。  相似文献   

5.
目的观察大鼠反复前脑缺血再灌注后不同脑白质区胶质纤维酸性蛋白(glial fibrillary acidic protein,GFAP)表达的变化,探讨其规律,为对脑缺血后星形胶质细胞的进一步研究提供实验依据。方法反复夹闭大鼠双侧颈总动脉制备前脑缺血再灌注模型,免疫组化法检测脑缺血再灌注后1周、2周、4周胼胝体、内囊和脑室周围GFAP的表达。结果缺血再灌注后,不同部位各时间点GFAP的表达均高于假手术组水平;在胼胝体、内囊GFAP的表达在1周时增加,2周时持续上升,4周时更明显;而脑室周围则在1周时上升,2周时达高峰,4周时回落但仍高于1周时的水平。结论反复前脑缺血后白质区GFAP表达明显升高,但不同脑区变化的规律和幅度略有差异,说明不同脑区对缺血的敏感性不同,星形胶质细胞的反应性略有差异。  相似文献   

6.
目的观察大鼠大脑缺血再灌注后海马CA1区胶质纤维酸性蛋白(GFAP)的表达与迟发性神经元死亡的关系。方法采用大鼠大脑中动脉阻塞再灌注模型(MCAO),将大鼠随机分为MCAO后3d、7d、30d组及假手术组,应用免疫荧光与TUNEL染色法分别观察脑缺血再灌注后不同时间点缺血侧海马CA1区GFAP表达情况和迟发性神经元死亡(DND)的变化。结果(1)3d组海马DND阳性(DND 组)的MCAO大鼠、海马DND阴性(DND-组)的MCAO大鼠与假手术组大鼠比较,缺血侧海马CA1区GFAP染色的平均光密度无显著性差异(P>0.05),但GFAP阳性细胞的形态发生变化;(2)7d组大鼠缺血侧海马CA1区GFAP阳性细胞大量活化增殖,表现为胞体变大,突起增多;DND( )、DND(-)组海马CA1区GFAP染色的平均光密度较假手术组增高(P<0.01),且DND(-)组的GFAP平均光密度较DND( )组明显增高(P<0.01);(3)30d组大鼠缺血侧海马CA1区GFAP表达呈瘢痕样改变,DND( )、DND(-)组与假手术组比较其GFAP染色的平均光密度明显增高(P<0.05),且DND( )组的GFAP平均光密度较DND(-)组明显增高(P<0.05)。结论大鼠MCAO后星形胶质细胞反应性变化的差异可能与海马CA1区迟发性神经元死亡的发生有关。  相似文献   

7.
BACKGROUND: Astrocytes react sensitively to cerebral ischemia, causing reactive proliferation and activation, which may contribute to their effect in protecting or injuring neuronal regeneration. Whether acupuncture, as a treatment for cerebral ischemia, regulates the activated state of astrocytes has become a focus of recent investigations. OBJECTIVE: To observe the effects of electroacupuncture (EA) on ultrastructure changes and reactive proliferation of astrocytes in the marginal zone of focal cerebral ischemia in rats. DESIGN, TIME AND SETTING: Randomized, controlled animal study. This study was performed at the Experimental Animal Center of Guangzhou University of Traditional Chinese Medicine between December 2007 and July 2008. MATERIALS: A total of 90 male Wistar rats were randomly divided into sham operated, model and EA groups. Each group was subdivided into 1 hour, 1, 3, 7, and 21 days post-cerebral ischemia groups, with six animals for each time point. Rabbit anti-rat glial fibrillary acidic protein (GFAP) and goat anti-rabbit IgG/tetramethylrhodamine isothiocyanate were provided by Beijing Biosynthesis Biotechnology. The G-6805 electric acupuncture apparatus was provided by Shanghai Huayi. METHODS: Heat-coagulation-induced occlusion of the middle cerebral artery was performed to establish a model of focal cerebral ischemia, in the model and EA groups. Middle cerebral arteries were exposed without occlusion in sham operated group. EA was applied immediately after surgery in the EA group, 4/20 Hz, 2.0-3.0 V, 1-3 mA, to Baihui(GV 20) and Dazhui(GV 14), for 30 minutes. The treatment was performed once a day. The sham operated and model groups did not receive acupuncture. MAIN OUTCOME MEASURES: In the marginal zone of focal cerebral ischemia in rats at different time points after intervention, the ultrastructure changes of astrocytes were observed by using transmission electronic microscopy. GFAP expression in astrocytes was also measured by laser confocal scanning microscopy. RESULTS: Cell swelling and rapid proliferation of astrocytes were observed following cerebral ischemia. In comparison to the model group, the degree of swelling of astrocytes was significantly decreased in the EA group. Compared with the sham operated group at hour 1 post-surgery, there was no significant difference in the expression of average fluorescence intensity of GFAP between the EA and model groups (P 〉 0.05), while the expression of GFAP in both the EA and model groups increased significantly at days 1, 3, 7 and 21 post-surgery (P 〈 0.01). The expression of GFAP in EA group was also significantly lower than in the model group (P 〈 0.01, P 〈 0.05). CONCLUSION: Ultrastructural changes and reactive proliferation of astrocytes appear in the marginal zone of focal cerebral ischemia in rats. EA can relieve the degree of swelling of astrocytes and inhibit GFAP overexpression by activated astrocytes. These effects may be related to its ability to regulate the activated state of astrocytes.  相似文献   

8.
BACKGROUND: Blood supply to the hippocampus is not provided by the middle cerebral artery. However, previous studies have shown that delayed neuronal death in the hippocampus may occur following focal cerebral ischemia induced by middle cerebral artery occlusion.
OBJECTIVE: To observe the relationship between reactive changes in hippocampal astrocytes and delayed neuronal death in the hippocampal CA1 region following middle cerebral artery occlusion.
DESIGN, TIME AND SETTING: The immunohistochemical, randomized, controlled animal study was performed at the Laboratory of Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, from July to November 2007.
MATERIALS: Rabbit anti-glial fibrillary acidic protein (GFAP) (Neomarkers, USA), goat anti-rabbit IgG (Sigma, USA) and ApoAlert apoptosis detection kit (Biosciences Clontech, USA) were used in this study. METHODS: A total of 42 healthy adult male Wistar rats, aged 3–5 months, were randomly divided into a sham operation group (n = 6) and a cerebral ischemia/reperfusion group (n = 36). In the cerebral ischemia/reperfusion group, cerebral ischemia/reperfusion models were created by middle cerebral artery occlusion. In the sham operation group, the thread was only inserted into the initial region of the internal carotid artery, and middle cerebral artery occlusion was not induced. Rats in the cerebral ischemia/reperfusion group were assigned to a delayed neuronal death (+) subgroup and a delayed neuronal death (–) subgroup, according to the occurrence of delayed neuronal death in the ischemic side of the hippocampal CA1 region following cerebral ischemia.
MAIN OUTCOME MEASURES: Delayed neuronal death in the hippocampal CA1 region was measured by Nissl staining. GFAP expression and delayed neuronal death changes were measured in the rat hippocampal CA1 region at the ischemic hemisphere by double staining for GFAP and TUNEL.
RESULTS: After 3 days of ischemia/reperfusion, astrocytes with abnormal morphology were detected in the rat hippocampal CA1 region in the delayed neuronal death (+) subgroup. No significant difference in GFAP expression was found in the rat hippocampal CA1 region at the ischemic hemisphere in the sham operation group, delayed neuronal death (+) subgroup and delayed neuronal death (–) subgroup (P 〉 0.05). After 7 days of ischemia/reperfusion, many GFAP-positive cells, which possessed a large cell body and an increased number of processes, were activated in the rat hippocampal CA1 region at the ischemic hemisphere. GFAP expression in the hippocampal CA1 region was greater in the delayed neuronal death (+) subgroup and delayed neuronal death (–) subgroup compared with the sham operation group (P 〈 0.01). Moreover, GFAP expression was significantly greater in the delayed neuronal death (–) subgroup than in the delayed neuronal death (+) subgroup (P 〈 0.01). After 30 days of ischemia/reperfusion, GFAP-positive cells were present in scar-like structures in the rat hippocampal CA1 region at the ischemic hemisphere. GFAP expression was significantly greater in the delayed neuronal death (+) subgroup and delayed neuronal death (–) subgroup compared with the sham operation group (P 〈 0.05). GFAP expression was significantly lower in the delayed neuronal death (–) subgroup than in the delayed neuronal death (+) subgroup (P 〈 0.05). The delayed neuronal death rates were 42% (5/12), 33% (4/12) and 33% (4/12) at 3, 7 and 30 days, respectively, followingischemia/reperfusion. No significant differences were detected at various time points (χ2 = 0.341, P 〉 0.05).
CONCLUSION: The activation of astrocytes was poor in the hippocampal CA1 region during the early stages of ischemia, which is an important reason for delayed neuronal death. Glial scar formation aggravated delayed neuronal death during the advanced ischemic stage.  相似文献   

9.
尼莫地平对慢性脑缺血大鼠认知和海马CA1区NOS亚型的影响   总被引:3,自引:2,他引:1  
目的 探讨尼莫地平对慢性脑缺血大鼠海马CA1区三种一氧化氮合酶亚型(nNOS、iNOS、eNOS)的表达和认知的影响.方法 24只大鼠随机分为假手术组、模型组和治疗组,双侧颈总动脉永久结扎造模,治疗组于术后24h开始用尼莫地平(10mg/kg,2次/d)灌胃,连续60d,各组于60d后用Y型迷宫测试认知功能,测试结束后做免疫组化染色,观察计算海马CA1区每个高倍镜视野下的阳性细胞均数.结果 与假手术组相比,模型组认知能力下降,海马CA1区nNOS和eNOS表达下降,iNOS表达增强,治疗组的各项指标介于两者之间.结论 尼莫地平能改善慢性脑缺血大鼠的认知能力,其机制可能与提高海马CA1区nNOS和eNOS的表达及抑制iNOS的表达有关.  相似文献   

10.
目的 观察骨髓间充质干细胞移植(mesenchymal stem cells,MSCs)对慢性脑缺血大鼠认知功能及海马CA1区EphB2的影响.方法 将SD大鼠随机分为假手术组、模型组、实验组(2VO模型+MSCs干预),选8、10、12w 3个时间点,采用双侧颈总动脉永久性阻断法(2VO)建立慢性脑缺血模型,通过Morris水迷宫检测各组大鼠的认知功能,同时用免疫组织化学的方法和Western blot检测大鼠海马CA1区EphB2的表达.结果 模型组和实验组大鼠与假手术组相比逃避潜伏期明显延长,在同一时间点实验组逃避潜伏期较模型组明显缩短(P<0.05),实验组海马CA1区EphB2的表达较模型组增多(P<0.05).结论 骨髓间充质干细胞移植能明显改善大鼠慢性脑缺血所致的认知功能障碍,其机制可能是通过升高EphB2的表达而改善学习记忆能力.  相似文献   

11.
缬沙坦对慢性脑缺血大鼠认知障碍及MDA、SOD的影响   总被引:2,自引:0,他引:2  
目的 研究缬沙坦对慢性脑缺血大鼠认知障碍、丙二醛 (MDA)及超氧化物歧化酶 (SOD)的影响。方法 采用双侧颈总动脉永久性结扎制备慢性脑缺血模型 ,3 0只大鼠随机分为 3组 ,A组 :假手术组 ;B组 :缺血组 ;C组 :缬沙坦治疗组。术后 12周测定其认知能力及脑组织MDA、SOD含量。结果 C组较B组认知障碍明显改善 (P <0 0 1) ,MDA含量明显降低 (P <0 0 1) ,SOD明显升高 (P <0 0 1)。结论 缬沙坦能有效清除自由基 ,并能改善慢性脑缺血大鼠的认知障碍。  相似文献   

12.
雌激素对慢性脑缺血大鼠认知功能及突触素的影响   总被引:1,自引:4,他引:1  
目的 研究苯甲酸雌二醇对慢性脑缺血大鼠认知功能及突触素的影响.方法 采用双侧颈总动脉永久性结扎制备慢性脑缺血模型,30只大鼠随机分为3组,A组:假手术组;B组:缺血组;C组:雌激素治疗组.各组于手术60d后,应用Y迷宫、免疫组化及图像分析系统测定大鼠认知功能及海马、齿状回突触素的含量.结果 治疗组较缺血组认知障碍明显改善(P<0.01),与假手术组相比,缺血组突触素的含量明显下降,治疗组以上变化明显减轻(P<0.01).结论 苯甲酸雌二醇能改善慢性脑缺血大鼠的认知功能,这可能与增加大鼠脑内突触素的含量有关.  相似文献   

13.
目的 探讨慢性脑低灌注大鼠海马活性调节的细胞骨架相关蛋白(activity-regulated cytoskeletal-associated protein,Arc)的低表达与其认知功能障碍的相关性。方法 大鼠慢性脑低灌注模型使用持久性双颈总动脉结扎术(2-vessel occlusion,2-VO); 大鼠随机分成假手术组和2-VO组,每组各6只。术后第8周行Morris水迷宫评价其认知功能; 实时定量聚合酶链式反应(Real time quantitative polymerase chain reaction,RT-qPCR)及蛋白免疫印迹法检测大鼠海马Arc mRNA及蛋白表达水平。结果(1)2-VO组大鼠第2~5 d的逃逸潜伏期比假手术组明显延长(P<0.01)及其在原平台区域游泳时间明显比假手术组短(P<0.01);(2)2-VO组大鼠海马Arc mRNA水平及免疫反应条带相对灰度值分别比假手术组明显降低(P均<0.01);(3)空间探索实验中2-VO大鼠在原平台区域游泳时间与海马Arc免疫反应条带相对灰度值呈正相关(r=0.7085,P<0.05)。结论 慢性脑低灌注大鼠的认知功能障碍可能与海马Arc的低表达相关。  相似文献   

14.
目的观察苯甲酸雌二醇对慢性脑缺血大鼠海马神经元胆碱乙酰转移酶的影响,以探讨胆碱乙酰转移酶的变化在慢性脑缺血发病中的作用及雌二醇对此变化的影响。方法采用双侧颈总动脉永久性结扎制备慢性脑缺血模型,30只大鼠随机分为假手术组、缺血组和雌二醇治疗组。各组于造模60d后,应用Y迷宫观察其行为学改变,采用免疫组化观测大鼠海马神经元胆碱乙酰转移酶的变化。结果治疗组较缺血组认知障碍明显改善(P〈0.01),其海马胆碱乙酰转移酶的表达也明显增高(P〈0.01)。结论苯甲酸雌二醇能改善慢性脑缺血大鼠的认知功能可能与其提高海马区胆碱乙酰转移酶水平有关。  相似文献   

15.
目的 探讨石榴汁中多酚类的抗氧化作用对由慢性脑低灌注引起的认知功能损害的影响. 方法 健康雄性Wistar大鼠按随机数字表法分为假手术组、双侧颈总动脉结扎组(2VO对照组)、双侧颈总动脉结扎+石榴汁组(2VO+PJ组).采用永久性双侧颈总动脉结扎法制备慢性脑低灌注大鼠模型,术后1周起假手术组、2VO对照组糖水灌胃,2VO+PJ组石榴汁灌胃,均2 mL/d,共7周.给药结束后应用Moms水迷宫检测各组大鼠空间学习记忆能力,新鲜组织取材检测皮层、海马组织MDA含量与SOD活力,Western blotting检测4-羟基壬烯醛(4-HNE)蛋白表达水平. 结果 与假手术组对比,2VO对照组大鼠的逃离潜伏期明显延长,目标象限探索时间明显缩短,差异有统计学意义(P<0.05);2VO+PJ组目标象限探索时间[(6.18±1.32)s]与2VO对照组[(3.96±1.65)s]比较明显延长,逃离潜伏期明显缩短,差异有统计学意义(P<0.05).与假手术组对比,2VO对照组SOD活力明显降低,MDA含量、4-HNE蛋白表达水平明显增加,差异有统计学意义(P<0.05);2VO+PJ组SOD活力[皮层(19.79±3.34) U/mg prot,海马(20.87±0.77) U/mg prot]比2VO对照组[皮层(15.79±0.39)U/mg prot,海马(18.90±0.81) U/mg prot]明显增加,2VO+PJ组MDA含量[皮层(1.21±0.29) nmol/mg prot,海马(2.31±0.35) nmol/mg prot]比2VO对照组(皮层(1.74±0.42) nmol/mg prot,海马(2.86±0.51)nmol/mg prot]明显降低,2VO+PJ组4-HNE蛋白表达水平比2VO对照组显著降低,差异均有统计学意义(P<0.05). 结论 石榴多酚抗氧化作用可减轻慢性脑低灌注引发的氧化应激所导致的认知功能损害.  相似文献   

16.
当归注射液抗慢性脑缺血大鼠认知功能损害的实验研究   总被引:1,自引:0,他引:1  
目的 观察当归注射液对慢性脑缺血后认知功能改变及氧化应激损伤和胆碱能系统的影响,探讨当归注射液改善慢性脑缺血认知功能的作用及机制. 方法 50只Wistar大鼠采用随机数字表法分为假手术组(n=16)、生理盐水组(n=18)及当归治疗组(n=16),后两组大鼠制成双侧颈动脉结扎慢性脑缺血模型(即2VO模型),缺血4周、干预4周后水迷宫检测3组大鼠认知功能,并取脑皮质测定氧化产物及胆碱酯酶含量. 结果 慢性脑缺血后大鼠的空间记忆能力受损,定位航行实验中第4、5天当归治疗组的隐匿平台逃避潜伏期较假手术组有所增加,但较生理盐水组明显缩短(分别为22.53±1.27、27.67±1.34),3组之间差异有统计学意义(P<0.05);当归治疗组在空间探索试验中穿越平台的次数较生理盐水组增多(分别为1.25±0.78、0.56±0.63),在平台区的停留时间延长(分别为21.99±4.97、12.80±2.88),3组之间差异有统计学意义(P<0.05);当归治疗组AchE含量有所下降,但与假手术组比较差异仍有统计学意义(P<0.05),同时,MDA含量增高,SOD活力、抑制羟自由基能力及总抗氧化能力降低,与假手术组比较差异没有统计学意义(P>0.05). 结论 当归注射液能改善慢性脑缺血的认知功能损害,其作用可能与抑制氧化应激反应有关.  相似文献   

17.
目的探讨60岁以上非瓣膜性房颤(nonvalvula atrial fibrillation,NAF)住院患者无症状性脑梗死(silent cerebral ischemia,SCI)与轻度认知障碍(m Iid cognitive impairment,MCI)的关系。方法 2014年11月至2015年11月惠州市中心人民医院住院的患者,共纳入98例,根据是否有NAF分为NAF组45例,窦性心律(sinus rhythm,SR)组53例。收集所有患者的一般临床资料,于住院1周内采用蒙特利尔认知评估量表(Montreal Cognitive Assessment,Mo CA)和头颅MRI分别进行认知功能评估和SCI检测。结果 NAF组Mo CA总评分低于SR组[16(10,20)vs.20(15,23),P=0.006]。NAF组患者至少出现1个SCI病灶的比例高于SR组(80.0%vs.52.8%,P=0.018)。NAF组比SR组SCI病灶更好发于皮层或皮层下白质(25.2%vs.12.4%,P=0.017)。多因素分析显示,AF患者Mo CA评分与教育程度有关;SR患者则与年龄、教育程度有关。结论 AF是认知功能下降的独立危险因素,同时与SCI发生有关。受教育程度也是影响老年患者认知功能的因素之一。  相似文献   

18.
无症状脑梗死与认知功能的关系   总被引:4,自引:0,他引:4  
目的探讨无症状脑梗死(SCI)与认知功能障碍的关系。方法采用简易精神状态检查法(MMSE)及临床痴呆评定量表(CDR)对61例无症状脑梗死患者和79例健康体检者的认知功能进行评分,比较两组轻度认知功能障碍(MCI)的发生率。结果无症状脑梗死组发生轻度认知功能障碍者13例(21.3%),显著高于健康体检组(P〈0.05)。结论SCI与认知功能障碍关系密切。  相似文献   

19.
目的探讨丰富环境干预对短暂性全脑缺血大鼠学习记忆能力的影响。方法本研究将Wistar大鼠随机分为缺血组和假手术组,采用四血管阻断法(4-VO)建立了大鼠短暂性全脑缺血再灌注模型。造模后缺血组随机分为丰富环境组(IE)和标准环境组(IS),假手术组亦随机分为丰富环境组(SE)和标准环境组(SS)。术后3d,IE组SE组置于丰富环境笼饲养,IS组和SS组置于标准笼饲养。于干扰14d(即缺血28d)开始,采用Morris水迷宫测评实验大鼠学习和记忆能力。结果经过4d的认知训练后我们发现,与IE组和假手术组相比,IS组动物找到平台的逃避潜伏期延长,经由路线增加(P<0.05)。IE组和假手术组之间比较,上述改变趋势基本一致,缺乏统计学上的显著性(P>0.05)。空间探索实验中的运动轨迹显示,在撤除平台后IE组和假手术组均能记忆原平台的位置,寻找路线大多集中在原平台象限,平台对面象限最少,而IS组路线较散乱,运动轨迹以随机式和边缘式为主。结论丰富环境干预可以改善脑缺血大鼠的学习记忆能力。  相似文献   

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