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Objective To investigate the changes and mechanism of learning and memory in rats by different doses of benzo (a) pyrene (B(a)P). Methods Forty weaned rats (28 days) were randomly divided into control group (NS), solvent group ( vegetable oil) and three B (a) P dosage groups (the doses were 5,10 and 20 mg / kg body weight respectively ). And all rats were administrated intraperitoneally every other day to one month. The capability of learning and memory in rats were measured by Morris water maze test, and the brain-derived neurotrophic factor ( BDNF) and NMDAR2B content in hippocampus were tested by immunohistochemistry. Results In training of Morris water maze,the average escape latency was extended gradually with increasing dose, and there was a statistically significant difference between high-dose group((62. 78 ±47. 25 )s) and the control group((40.60±38.79)s)(P< 0.01). Compared with the control group(11.25 ±2.63), the number of crossplatform of high-dose group(4.33 ±2.08) was statistically reduced (P<0.05). B(a)P at 10 and 20 mg/kg decreased NMDAR2B and BDNF expression in hippocampus of rats in immunohistochemistry. The level of NMDAR2B was (162.23 ±6.56) in the high-dose group and (150.38 ± 15.34) in the control group(P<0.05);the expression level of BDNF was (163. 13 ± 8.09) in the high-dose group and (141.83 ± 13.37) in the control group(P< 0.05). Conclusion Subacute B(a)P exposure can reduce spatial learning and memory in weaning rats, it may be related to decreased levels of NMDAR2B and BDNF in hippocampus.  相似文献   

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Background Brain-derived neurotrophic factor (BDNF) is a stress-responsive intercellular messenger modifying hypothalamic-pituitary-adrenal (HPA) axis activity. The interaction between stress and age in BDNF expression is currently not fully understood. This study was conducted to observe unpredictable stress effect on behavior and BDNF expression in CA3 subfield (CA3) and dentate gyrus of hippocampus in different aged rats. Methods Forty-eight Wistar rats of two different ages (2 months and 15 months) were randomly assigned to six groups: two control groups and four stress groups. The rats in the stress group received three weeks of unpredictable mild stress. The depression state and the stress level of the animals were determined by sucrose preference test and observation of exploratory behavior in an open field (OF) test. The expressions of BDNF in CA3 and dentate gyrus of the hippocampus were measured using immunohistochemistry. Results Age and stress had different effects on the behavior of different aged animals (age: F=6.173, P〈0.05, stress: F=6.056, P 〈0.05). Stress was the main factor affecting sucrose preference (F=123.608, P 〈0.05). Decreased sucrose preference and suppressed behavior emerged directly following stress, lasting to at least the eighth day after stress in young animals (P 〈0.05). The older stress rats showed a lower sucrose preference than young stress rats (P 〈0.05). Older control rats behaved differently from the younger control animals in the OF test, spending more time in the central square (P 〈0.05), exhibiting fewer vertical movements (P 〈0.05) and less grooming (P 〈0.05). Following exposure to stress, older-aged rats showed no obvious changes in vertical movement and grooming. This indicates that aged rats were in an unexcited state before the stress period, and responded less to stressful stimuli than younger rats. There was significantly lower BDNF expression in the CA3 and dentate gyrus regions of the hippocampus following stress in both age groups (P〈0.05), a reduction that was still present at the eighth day after stress (P〈0.05). Stress and age were the main factors affecting the expression of BDNF (F=9.408, P 〈0.05; F=106.303, P 〈0.05). The aged stress group showed lower BDNF expression compared to the young stressed group at every testing time point. Conclusion Stress has age-dependent effects on behavioral responses and hippocampal BDNF expression in rats.  相似文献   

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Background A new brain region, the marginal division (MrD) , was discovered at the caudal margin of the neostriatum. The MrD was shown to be involved in learning and memory in the rat. The aim of this study was to investigate the expression of the immediate-early genes c-fos and c-jun in the MrD of the striatum during learning and memory processes in the rat, immunocytochemical and Western blot methods were used to examine Y-maze trained rats.Methods The rats were divided into three groups, namely the training, pseudotraining, and control groups. After Y-maze training, the expression of the immediate-early genes c-fos and c-jun in the MrD of the rats was investigated using immunocytochemical and Western blot methods.Results After one hour of Y-maze training, the expression of c-jun and c-fos proteins was significantly enhanced in the MrD; the c-jun protein, in particular, was more intensely expressed in this region than in other parts of the striatum. The expression of these two proteins in the training group was significantly higher than in the pseudotraining and control groups. In addition, positive expression was also found in the hippocampus,cingulum cortex, thalamus, and in other areas. Western blot disclosed two immunoreactive bands for the anti-c-fos antibody (47kD and 54kD) and two immunoreactive bands for the anti-c-jun antibody (39kD and 54kD). Conclusions These results indicate that the immediate-early genes c-fos and c-jun participate in signal transduction during the learning and memory processes associated with Y-maze training in rats.  相似文献   

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Objective To observe the effects of repeated subconvulsive electrical stimuli to the hippocampus on the emotional behavior and spatial learning and memory ability in rats.Methods One hundred and eight male Wistar rats were randomized into 3 groups. Animals in group SE (n=42) were given subconvulsive electrical stimulation to the hippocampus through a constant pulsating current of 100 μA with an intratrain frequency of 25 Hz, pulse duration of 1 millisecond, train duration of 10 seconds and interstimulus interval of 7 minutes, 8 times a day, for 5 days. In the electrode control group or CE group (n=33), animals were implanted with an electrode in the hippocampus, but were not stimulated. Group NC (n=33) animals received no electrode or any stimulation. The emotional behavior of experimental rats was examined by activity in an unfamiliar open field and resistance to capture from the open field, while the spatial learning and memory ability was measured during training in a Morris water maze.Results The stimulated rats tested 1 month after the last round of stimulation displayed substantial decreases in open field activity (scale: 10.4±2.3, P<0.05) and increases in resistance to capture (scale: 2.85±0.56, P<0.01). The amount of time for rats in group SE to find the platform (latency) as a measurement for spatial bias was prolonged (29±7) seconds after 15 trials in the water maze, P<0.05). The experimental rats swam aimlessly in all four pool quadrants during the probe trial in the Morris water maze.Conclusions Following repeated subconvulsive electrical stimuli to the hippocampus, rats displayed long-lasting significant abnormalities in emotional behavior, increased anxiety and defensiveness, enhanced ease to and delayed habituation to startlement, transitory spatial learning and memory disorder, which parallels many of the symptoms in posttraumatic stress disorder patients.  相似文献   

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Objective To study the effect of chronic noise exposure on expression of N-methyl-D-aspartic acid receptor 2B (NR2B) and tau phosphorylation in hippocampus of rats. Methods Twenty-four male SD rats were divided in control group and chronic noise exposure group. NR2B expression and tau phosphorylation in hippocampus of rats were detected after chronic noise exposure (100 dB SPL white noise, 4 h/d×30d) and their mechanisms underlying neuronal apoptosis in hippocampus of rats with TUNEL staining. Results The NR2B expression decreased significantly after chronic noise exposure which resulted in tau hyperphosphorylation and neural apoptosis in hippocampus of rats. Immunohistochemistry showed that the tau hyperphosphorylation was most prominent in dentate gyrus (DG) and CA1 region of rat hippocampus. Conclusion The abnormality of neurotransmitter system, especially Glu and NR2B containing NMDA receptor, and tau hyperphosphorylation in hippocampus of rats, may play a role in chronic noise-induced neural apoptosis and cognition impairment.  相似文献   

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Objective To observe the effect of electroacupuncture (EA) on learning and memory and the pathology morphologic of nerve and the quantitative changes of synapses in CA3 sector of the hippocampus on vascular dementia (VD) rats. Methods The VD rats were modeled with method of global ischemia reperfusion by 4 vascular occlusion (4-vo). Morris water maze tests were used for a behavioral study. The changes of the ultra structure parameter in CA3 sector of the hippocampus were studied with transmission electron microscope and picture analysis system. Results The model group animals needed more escape time than the control group, and they did not swim longer in platform quadrant than in the others in the Morris water tests. In the control group and electro-acupuncture group, the modality configuration of cells in CA3 sector of the hippocampus was normal, and the normal and abnormal chromatin was obvious. The configuration of endoplasmic reticulum, chondriosome and synapses was normal. The front and back membrane of the synapses was clear. In the VD group, the cells were atrophied and dwindled. The front and back membrane of the synapses was illegible. The clearance, PSD and interphase curvature on area of Gray type Ⅰ synapses in CA3 sector of the hippocampus in VD rats were decreased significantly. In the EA group, the animals cut the escape time mostly and they swam more times in platform quadrant than in other three quadrants. The interphase curvature, cleft and PSD on area of Gray type Ⅰ synapses in CA3 sector of the hippocampus were increased significantly. Conclusion EA can improve learning and memory of VD rats by restraining the disappearance of nerve cells, and influencing the structure parameter of synapses in CA3 sector of the hippocampus.  相似文献   

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Objective To examine the effect of docosahexaenoic acid (DHA) deficiency in brain on spatial learning and memory in rats. Methods Sprague Dawley rats were fed with an n-3 fatty acid deficient diet for two generations to induce DHA depletion in brain, DHA in seven brain regions was analyzed using the gas-liquid chromatography. Morris water maze (MWM) was employed as an assessing index of spatial learning and memory in the n-3 fatty acid deficient adult rats of second generation. Results Feeding an n-3 deficient diet for two generations depleted DHA differently by 39%-63% in the seven brain regions including cerebellum, medulla, hypothalamus, striatum, hippocampus, cortex and midbrain, The MWM test showed that the n-3 deficient rats took a longer time and swam a longer distance to find the escape platform than the n-3 Adq group. Condusion The spatial learning and memory in adult rats are partially impaired by brain DHA depletion.  相似文献   

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Background  The molarless condition has been reported to compromise learning and memory functions. However, it remains unclear how the molarless condition directly affects the central nervous system, and the functional consequences on the brain cortex and hippocampus have not been described in detail. The aim of this study was to find the molecular mechanism related with learning and memory deficit after a bilateral molarless condition having been surgically induced in senescence-accelerated mice/prone8 (SAMP8) mice, which may ultimately provide an experimental basis for clinical prevention of senile dementia.
Methods  Mice were either sham-operated or subjected to complete molar removal. The animals’ body weights were monitored every day. Learning ability and memory were measured in a water maze test at the end of the 1st, 2nd, and 3rd months after surgery. As soon as significantly prolonged escape latency in the molarless group was detected, the locomotor activity was examined in an open field test. Subsequently, the animals were decapitated and the cortex and hippocampus were dissected for Western blotting to measure the expression levels of brain-derived neurotrophic factor (BDNF) and the tropomyosin related kinase B (TrkB), the high affinity receptor of BDNF.
Results  Slightly lower weights were consistently observed in the molarless group, but there was no significant difference in weights between the two groups (P >0.05). Compared with the sham group, the molarless group exhibited lengthened escape latency in the water maze test three months after surgery, whereas no difference in locomotor activity was observed. Meanwhile, in the cortex and hippocampus, BDNF levels were significantly decreased in the molarless group (P <0.05); but the expression of its receptor, TrkB, was not significantly affected. 
Conclusion  These results suggested that the molarless condition impaired learning and memory abilities in SAMP8 mice three months after teeth extraction, and this effect was accompanied by significantly reduced BDNF expression in the cortex and hippocampus.
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Background  Obstructive sleep apnea (OSA) can cause cognitive dysfunction and may be a reversible cause of cognitive loss in patients with Alzheimer’s disease (AD). Chronic exposure to intermittent hypoxia (IH), such as encountered in OSA, is marked by neurodegenerative changes in rat brain. We investigated the change of thioredoxin (Trx), spatial learning and memory in rats exposed to chronic intermittent hypoxia (CIH).
Methods  Forty healthy male Sprague-Dawley (SD) rats were randomly divided into four groups of ten each: a CIH+normal saline (CIH+NS group), a N-acetylcystein-treated CIH (CIH+NAC) group, a sham CIH group (sham CIH+NS), and a sham NAC-treated sham CIH (CIH+NAC) group. Spatial learning and memory in each group was assessed with the Morris water maze. Real-time PCR and Western blotting were used to examine mRNA and protein expression of Trx in the hippocampus tissue. The terminal deoxynucleotidyl transferase-mediated dUTP-nick end-labeling (TUNEL) method was used to detect the apoptotic cells of the hippocampus CA1 region.
Results  CIH-rats showed impaired spatial learning and memory in the Morris water maze, including longer mean latencies for the target platform, reduced numbers of passes over the previous target platform and a smaller percentage of time spent in the target quadrant. Trx mRNA and protein levels were significantly decreased in the CIH-hippocampus, meanwhile, an elevated apoptotic index revealed apoptosis of hippocampal neurons of rats exposed to CIH. The rats, which acted better in the Morris water maze, showed higher levels of the Trx mRNA and protein in the hippocampus; apoptotic index of the neurons in the hippocampus of each group was negatively correlated with the Trx mRNA and protein levels.
Conclusion  The Trx deficit likely plays an important role in the impaired spatial learning and memory in the rats exposed to CIH and may work through the apoptosis of neurons in the hippocampus.
  相似文献   

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目的采用慢性应激复制抑郁大鼠模型,观测白松片对抑郁模型大鼠海马BDNF、TrkB表达的影响,探讨白松片的抗抑郁作用机制。方法将大鼠随机分为正常组、模型组、白松片组、氟西汀组,采用连续21d慢性轻度不可预见性应激配合孤养复制抑郁模型。运用免疫组化方法研究白松片对抑郁模型大鼠海马CA1、CA3区锥体细胞和齿状回颗粒细胞BDNF、TrkB蛋白表达的影响。结果与正常组相比,模型组大鼠海马CA1、CA3区和齿状回BDNF、TrkB免疫反应阳性神经元平均灰度值上升,分别为107. 73±3. 43、119. 40±6. 36、109. 20±4. 65;与模型组相比,白松片组大鼠海马CA1、CA3区和齿状回BDNF、TrkB免疫反应阳性神经元平均灰度值下降,分别为105. 80±3. 32、109. 87±4. 82、105. 00±2. 56。结论白松片增加抑郁模型大鼠海马BDNF、TrkB的表达,可能是其抗抑郁作用的分子机制之一。  相似文献   

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目的:研究脑源性神经营养因子(BDNF)和端粒酶逆转录酶(TERT)联合转染的骨髓基质干细胞(BMSCs)对血管性痴呆(VD)大鼠学习记忆功能恢复的作用,进一步探讨VD的有效治疗途径。方法:经大鼠股骨分离并鉴定BMSCs,构建pLXSN—TERT重组子后转化至BMSCs,软琼脂克隆形成实验检测体外培养的TERT—BMSCs的成瘤性。应用Ad5一BDNF转染TERT—BMSCs,构建BDNF—TERT联合转染的BMSCs。将40只雄性Wistar大鼠随机分为4组:对照组、VD组、BMSCs组、BDNF—TERT—BMSCs组。采用两血管阻断法制备VD模型。采用Morns水迷宫测试方法测试各组大鼠空间学习记忆力。应用RT—PCR和Westemblot方法分别检测各组大鼠海马CA1区BDNF、TrkB、SYN基因mRNA和蛋白表达情况,应用透射电镜观察各组大鼠海马CAl区超微结构变化。结果:行为学实验Mo州s水迷宫测试结果及超微病理透射电镜观察均显示BMSCs和BDNF—TERT—BMSCs对血管性痴呆大鼠有改善作用,且BDNF—TERT—BMSCs较BMSCs的作用更为显著。荧光实时定量RT—PCR和Westernblot结果显示,BMSCs组和BDNF—TERT—BMSCs组中BDNF、TrkB、SYNmRNA及蛋白表达水平均较痴呆模型组增高(P〈0.05),且BDNF—TERT—BMSCs组较BMSCs组增加更为显著,差异有统计学意义(P〈0.05)。结论:BDNF—TERT联合转染BMSCs较普通的BMSCs对VD有更好的治疗效果,可明显改善VD大鼠的学习记忆功能的恢复。  相似文献   

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目的观察电项针对慢性睡眠剥夺(CSD)轻度认知障碍大鼠海马组织中突触素(SYN)、脑源性神经营养因子(BDNF)和酪氨酸激酶受体B(TrkB)蛋白表达的影响,探讨电项针改善CSD记忆损伤的作用机制。方法将24只雄性Wistar大鼠随机分为大平台对照组、模型组和电项针组,每组8只。模型组和电项针组采用改良的多平台水环境法制备模型,大平台对照组除平台表面有细密铁丝网外,其他条件与造模环境一致。电项针组选取两侧的风池和供血穴电针治疗,模型组和大平台对照组给予相同时间的捆绑固定,共14 d。Morris水迷宫实验检测大鼠学习记忆能力,免疫组化技术检测各组海马CA1区SYN、BDNF和TrkB蛋白的定性表达,Western blot技术检测各组海马区SYN、BDNF和TrkB蛋白的定量表达。结果造模后,模型组和电项针组大鼠逃避潜伏期较大平台对照组明显延长(P<0.05),经针刺治疗后,电项针组逃避潜伏期较模型组显著缩短(P<0.05)。免疫组化和Western blot结果显示,与大平台对照组相比,模型组大鼠海马SYN、BDNF和TrkB蛋白表达均明显减少(P<0.05);与模型组相比,电项针组大鼠海马SYN、BDNF和TrkB蛋白表达升高(P<0.05)。与大平台对照组大鼠相比,电项针组TrkB表达升高(P<0.05),SYN和BDNF表达差异无统计学意义(P>0.05)。结论电项针能显著上调CSD轻度认知障碍大鼠海马区SYN、BDNF和TrkB蛋白的表达,增强海马突触可塑性。  相似文献   

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《中国现代医生》2020,58(19):33-36
目的 分析帕罗西汀片对改善抑郁症大鼠模型抑郁行为的效果,同时对相关作用机制进行探讨。方法 选取健康雄性SD大鼠63只,并随机分为参照组(n=21)、试验组(n=21)及模型组(n=21)。正常饲养参照组大鼠,试验组大鼠及模型组大鼠在孤养及慢性轻度不可预见刺激条件下进行抑郁症大鼠模型构建,模型建立期间对试验组大鼠实施帕罗西汀灌胃操作,对模型组及参照组大鼠实施0.9%NaCl灌胃操作,分析帕罗西汀片对抑郁症大鼠自主活动次数、不动时间、记忆能力及学习能力大鼠海马CA3区TrkB、BDNF蛋白表达产生的影响。结果 试验组大鼠自主活动次数明显较模型组多,试验组及模型组大鼠自主活动次数均明显少于参照组大鼠,差异有统计学意义(P0.05)。Morris水迷宫定位航行实验结果显示,试验组大鼠潜伏期第1~4天均明显短于模型组,试验组、模型组Morris水迷宫空间探索实验穿台次数明显多于参照组,差异有统计学意义(P0.05)。免疫组化染色结果表明大鼠海马CA3区BDNF蛋白阳性着色为棕褐色,TrkB着色亦为棕褐色,与参照组及试验组相比,模型组阳性着色明显减少且染色强度明显下降。模型组大鼠TrkB及BDNF蛋白阳性细胞占比均显著低于参照组及试验组(P0.05);试验组大鼠TrkB及BDNF蛋白阳性细胞占比较参照组低,差异有统计学意义(P0.05)。结论 帕罗西汀片能够使抑郁症大鼠抑郁症状得到明显改善,同时还能使大鼠记忆能力以及学习能力得到提高,作用机制与海马CA3区TrkB及BDNF蛋白表达获得上调存在一定的相关性。  相似文献   

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Objective: To investigate the changes of brain derived neurotrophic factor(BDNF) in hippocampus of chronic lead exposed rats. Methods: Wistar rats were exposed to lead by drinking 0.02%、0.2% lead acetate solution for three months, respectively. Investigate the changes of learning and memory ability by Y-labyrinth experiment, study the changes of BDNF positive neuron in CA1, CA3 and dentate gyrus in hippocampus of rats by immunohistochemistry. Results: BDNF positive neurons distribute everywhere in the hippocampus under normal condition. Compared with the contral group, the number of BDNF positive neurons in the hippocampus subregions were decreased significantly of two different dosage (0.02%, 0.2% ) chronic lead exposed groups( P < 0. 05). Conclusion: These results suggest that the reduction of BDNF positive neuron in hippocampus might be related to the impact of lead on learning and memory.  相似文献   

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目的 探索早年慢性应激对青春期病理性攻击大鼠空间学习记忆能力,及对海马脑源性神经营养因子(BDNF)、5-羟色胺(5-HT)水平的影响。方法 将20只雄性、出生后21 d 的Sprague-Dawley大鼠分为实验组、对照组,每组各10只。实验组大鼠采用孤养、昼夜颠倒、非奖赏性挫败、预激惹刺激、居住-入侵攻击等多种早年持续性应激方法持续到青春期。然后采用居住-入侵攻击实验检测两组青春期大鼠的攻击性,水迷宫实验观察其空间学习记忆能力,运用免疫组化方法检测大鼠海马内BDNF和5-HT水平。结果 (1)水迷宫实验:实验组大鼠在总路程、穿越目标区域次数、逃避潜伏期3项指标上与对照组差异有统计学意义(P<0.05),而中心区域路程/总路程比值与对照组比较差异无统计学意义(P>0.05)。(2)免疫组化结果显示:与对照组比较,实验组大鼠海马内BDNF和5-HT免疫阳性神经元数量均减少(P<0.05),BDNF和5-HT表达降低。结论 BDNF和5-HT可能参与了青春期病理性攻击大鼠海马空间学习记忆能力的调控,并在空间学习记忆方面起着重要调控作用。  相似文献   

17.
目的探讨低浓度酒精摄取对成年大鼠空间位置记忆的影响,并通过免疫组织化学方法检测低浓度酒精摄取后海马CA1区脑源性神经营养因子(BDNF)的表达。方法成年雄性SD大鼠给予连续3d Morris水迷宫训练,然后动物随机分为实验组和对照组。实验组动物给予5%(V/V)酒精为唯一饮料喂养,对照组动物以自来水代替酒精。在给与酒精喂养后的3,7,14,21,30d行Morris水迷宫行为观察。动物在水迷宫行为学观察后,取脑、冰冻切片,用ABC法行BDNF免疫组织化学反应,用Motic 3.2图像分析系统测定免疫反应阳性产物的平均灰度值。结果给予低浓度酒精喂养3d与7d后,动物找到平台的潜伏期[分别为(8.93±1.38)s,(9.66±1.04)s]与对照组[分别为(8.24±2.94)s,(10.07±O.71)s](P>0.05),酒精喂养14,21,30d后,动物找到平台的潜伏期[分别为(9.19±1.81)s,(10.45±0.97)s,(12.37±1.81)s]明显短于对照组[分别为(17.14±3.66)s,(18.83±1.25)、s,(21.41±2.73)s],差异有显著性(P<0.05)。BDNF的免疫组化反应显示低浓度酒精喂养3d时BDNF在海马CA1区的表达平均灰度值(145.3±14)与对照组(143.8±12)相比差异无显著性(P>0.05);而低浓度酒精喂养7d、14d与21d时,海马CA1区BDNF的表达平均灰度值(分别为125.6±17,127.4±15,130.7±14)明显低于对照组(分别为147.5±13,142.7±10,145.8±16)(平均灰度值与阳性产物的多少成反比)(P<0.05);酒精连续喂养30d后,海马CA1区BDNF的表达平均灰度值(146.2±11)接近于对照组(144.5±14),差异无显著性(P>0.05)。结论短期内低浓度酒精摄取有助于成年大鼠空间位置记忆的保持,其机制可能与低浓度酒精摄取上调BDNF在海马CA1区的表达有关。  相似文献   

18.
目的 观察电针对去势雌性大鼠记忆、脑内脑源性神经营养因子(BDNF)及其受体酪氨酸激酶受体B(TrkB)表达的影响.方法 将SD大鼠36只随机分为假手术组,模型组和电针组,每组12只.假手术组大鼠仅切开皮肤,其余各组大鼠给予卵巢摘除,15 d后,电针组给予电针刺激,隔日1次,持续45 d.Morris水迷宫测试各组大鼠学习记忆能力,免疫组化法检测各组大鼠海马CA1区BDNF和TrkB蛋白的表达.结果 水迷宫结果显示,与假手术组比较,模型组大鼠的逃避潜伏期明显延长(P<0.05),穿越平台次数明显减少(P<0.01).与模型组比较,电针组大鼠的逃避潜伏期明显缩短(P<0.05),穿越平台次数明显增加(P<0.01).免疫组化结果显示,与假手术组相比,模型组大鼠海马CA1区BDNF表达明显减少(P<0.01).与模型组相比,电针组大鼠海马CA1区BDNF表达明显增加(P<0.01).但各组TrkB表达无显著差异(P>0.05).结论 电针改善去势雌性大鼠记忆障碍的机制可能与增加海马CA1区BDNF的表达有关.  相似文献   

19.
目的观察益气养阴活血法对糖尿病合并脑缺血大鼠空间学习记忆能力及脑源性神经营养因子(brain derived neurotrophic factor,BDNF)表达的影响,并运用工具药(BDNF的Trk受体抑制剂)证实BDNF通路在其中的作用。方法将大鼠分为假手术组、模型对照组(糖尿病合并脑缺血伴气阴两虚、瘀血阻络证)、益气养阴活血组、益气养阴活血+K252a组、益气活血组,每组20只,选用具有益气养阴活血作用的人参、川芎、玉竹、黄精组合,运用免疫组织化学法和Morris水迷宫实验观察益气养阴活血药对糖尿病合并脑缺血模型大鼠空间学习记忆的作用及对BDNF表达的影响。结果与模型对照组比较,益气养阴活血药物和益气活血药物均可以明显增加糖尿病合并脑缺血大鼠海马齿状回BDNF的表达(P0.01),益气养阴活血药物显著缩短模型大鼠找到水下平台的潜伏期(P0.01),益气养阴活血药物和益气活血药物均显著延长大鼠在原水下平台的停留时间(P0.05,或P0.01),其中益气养阴活血药物效果优于益气活血药物(P0.05)。侧脑室注射K252a可以阻断益气养阴活血药物促进模型大鼠的空间记忆能力的恢复(P0.01)。结论益气养阴活血药物可能通过促进模型大鼠海马齿状回BDNF的表达而改善空间记忆功能。  相似文献   

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