Gastrodin improves cognitive dysfunction and decreases oxidative stress in vascular dementia rats induced by chronic ischemia

Objective: To study the potential protective effects of gastrodin on reducing tissue oxidative stress and attenuating cognitive deficits in vascular dementia induced by cerebral chronic hyperfusion. To explore the detailed molecular mechanisms. Methods: 6 to 8 week old male Wistar rats were adopted as experimental animals. Animals were divided into the following groups: Group 1 (sham group with no occlusion), Group 2 (control group with 2VO procedure), Group 3 (sham group with gastrodin administration), Group 4 (2VO group with gastrodin administration). Morris water maze (MWM) test was adopted to test the learning and memory function of rats within different groups. MDA, glutathione peroxidase and total thiol assessment was done to reflect the oxidative stress in the brain tissue. Cell counting kit-8 (CCK8) and flow cytometry (FCM) were performed to examine the cell viability and apoptosis rate of SH-SY5Y cells induced by hydrogen peroxide and rescued by gastrodin treatments. Reactive oxygen species (ROS) generation was determined by the 2’, 7’-dichlorofluorescein diacetate (DCFH-DA) assay. qPCR and Western blot (WB) were adopted to detect the molecular mechanisms related to the anti-apoptosis and ROS scavenging effects of gastrodin. Results: Our results indicated an obvious protective effect of gastrodin on vascular dementia induced brain ischemia. Administration of gastrodin could improve the impaired learning and memory function induced by 2VO procedure in rats. The levels of MDA were partially decreased by the administration of gastrodin. The levels of glutathione peroxidase and total thiol were partially restored by the administration of gastrodin. Cell viability was improved by gastrodin in a dose-dependent pattern on SH-SY5Y cells induced by hydrogen peroxide (P < 0.05). Cell apoptosis rate was reduced by gastrodin in a dose-dependent pattern on SH-SY5Y cells induced by hydrogen peroxide (P < 0.05). Gastrodin could scavenge ROS generation induced by pre-treatment of hydrogen peroxide. Both qPCR and WB results showed significant enhancements on the expression levels of NFE2L2, ADH7, GPX2 and GPX3 (P < 0.05). Conclusion: Gastrodin administration is protective on the learning and memory functions that might be affected by vascular dementia induced oxidative stress due to brain ischemia. On the molecular level, NFE2L2, ADH7, GPX2 and GPX3 were up regulated by gastrodin.     

Electroacupuncture restores learning and memory impairment induced by both diabetes mellitus and cerebral ischemia in rats

Previous investigations have demonstrated that electroacupunctural stimulation can ameliorate primary and secondary symptoms such as peripheral neuropathy and diabetic encephalopathy in diabetic rats. In this study, we investigated whether electroacupuncture could improve learning and memory which was typically impaired in diabetic rats with cerebral ischemia. Furthermore, we investigated the mechanisms underlying its effects using passive avoidance test, active avoidance test, Morris water maze and electrophysiology. Electroacupuncture increased the step-down latency in passive avoidance test and accurate rate in active avoidance test, decreased the escape latency in Morris water maze. After electroacupuncture treatment, the long-term potentiation (LTP) impaired by both diabetes and cerebral ischemia was restored significantly. These results suggest that electroacupuncture can ameliorate learning and memory capacity impaired by hyperglycemia and ischemia. LTP plays a very important role in this beneficial effect.     

人参皂苷Rbl对大鼠局灶性脑缺血白质重塑的影响

目的　探讨人参皂苷Rbl(Ginsenoside Rb1,GSRb1)对大鼠局灶性脑缺血白质重塑的影响。 方法　大鼠随机分为假手术组、溶媒处理组和人参皂苷Rbl处理组,采用线栓法建立大鼠大脑中动脉缺血再灌注（middle cerebral artery occlusion/reperfusion, MCAO/R）损伤模型,用LFB染色观察大鼠胼胝体和内囊的髓鞘变化,用免疫组化染色法检测缺血侧胼胝体GFAP和APP的表达以评估星形胶质细胞和轴突的改变。 结果　缺血2 h再灌72 h后,溶媒处理组胼胝体和内囊有明显的髓鞘紊乱、脱失,胼胝体GFAP和APP表达显著增加。与溶媒处理组相比,GSRb1处理组髓鞘脱失有明显改善 (P<0. 01, P<0. 05)且胼胝体GFAP和APP表达显著减少(P<0. 05)。 结论　GSRb1可能促进大鼠局灶性脑缺血后脑白质重塑。     

Puerarin attenuates cognitive dysfunction and oxidative stress in vascular dementia rats induced by chronic ischemia

Objective: To explored the effects of puerarin on cognitive deficits and tissue oxidative stress and the underlying mechanisms. Methods: 6 to 8 week old male Wistar rats were adopted as experimental animals. Morris water maze (MWM) test was adopted to test the learning and memory function of rats. MDA, glutathione peroxidase and total thiol assessment was done to reflect the oxidative stress in the brain tissue. Cell Counting Kit-8 (CCK8) and flow cytometry (FCM) were performed to examine the cell viability and apoptosis rate. Reactive oxygen species (ROS) generation was determined by the 2’, 7’-dichlorofluorescein diacetate (DCFH-DA) assay. qPCR and Western blot (WB) were adopted to test the molecular function mechanisms of puerarin. Results: Our results indicated a protective effect of puerarin on vascular dementia. Administration of puerarin could improve the impaired learning and memory function. The levels of MDA were partially decreased by puerarin. The levels of glutathione peroxidase and total thiol were partially restored. Cell viability was improved in a dose-dependent pattern (P < 0.05). Cell apoptosis rate was reduced in a dose-dependent pattern (P < 0.05). Puerarin could scavenge ROS generation induced by pre-treatment of hydrogen peroxide. The results showed up-regulated levels of Nrf2, FoxO1, FoxO3 and FoxO4 (P < 0.05). Conclusion: Puerarin is protective on the vascular dementia by reducing oxidative stress and improving learning and memory functions. On the molecular level, Nrf2, FoxO1, FoxO3 and FoxO4 were up regulated by puerarin.     

糖尿病合并脑缺血再灌注导致学习记忆障碍大鼠模型的建立

目的建立糖尿病合并脑缺血再灌注导致学习记忆障碍大鼠模型。方法Wistar大鼠70只,分为正常对照组,糖尿病 假手术组,脑缺血组,糖尿病 脑缺血组。腹腔注射链脲佐菌素建立糖尿病模型,3d后双侧颈总动脉夹阻再灌注2次。术后1个月用跳台和Morris水迷宫判断其学习记忆能力,取海马组织,HE染色观察CA1区的细胞分布。结果电击后5min模型组的被动回避反应下台潜伏期明显缩短(P<0.01),24h后仍小于其他各组(P<0.05)。模型组学会主动回避反应的训练次数显著多于其他3组(P<0.001)。模型组在目标象限停留的时间最短(P<0.01),游泳的距离也最短(P<0.05)。结论糖尿病合并脑缺血再灌注可在短期内造成学习记忆障碍,糖尿病可加重脑缺血造成的脑损伤。     

口服辛伐他汀3个月可改善慢性脑低灌注模型大鼠的学习记忆功能

文题释义：辛伐他汀：是临床常用的降脂药,可以穿过血脑屏障,起到改善脑缺血所致氧化应激和炎症反应的作用。基质金属蛋白酶9是认知功能受损的关键蛋白,辛伐他汀可增加海马区基质金属蛋白酶9的表达,从而改善血管性认知障碍和痴呆患者的学习记忆功能。慢性脑低灌注：血管危险因素与神经退行性病变和痴呆的发生密切相关,慢性脑低灌注是痴呆的早期阶段特点,同时也是认知功能下降的预警指标。慢性脑低灌注的发生导致多种神经病理学改变,如神经炎性反应、少突胶质细胞丢失、脑白质损伤等。改善慢性脑低灌注阶段的缺血缺氧性损伤对学习记忆功能的维持和痴呆预防的意义重大。 背景：慢性脑低灌注状态与认知功能下降显著相关,前期研究发现线粒体老化、沉默突触增加、α-突触核蛋白等是其重要的病理改变,而传统调脂药物辛伐他汀可穿过血脑屏障发挥抗动脉粥样硬化、抗血栓形成及抗炎效应等改善认知功能。目的：观察持续口服辛伐他汀3个月对慢性脑低灌注雄性SD大鼠认知功能的影响,探讨辛伐他汀对防治血管性认知障碍和痴呆的临床意义。方法：将SD大鼠随机分为慢性脑低灌注组、假手术组、溶剂组、辛伐他汀组。①慢性脑低灌注组：结扎双侧颈总动脉;②假手术组：除不结扎双侧颈总动脉外,其余造模步骤一致;③溶剂组：大鼠造模后给予溶剂0.5%羧甲基纤维素钠灌胃,以排除溶剂对实验的干扰;④辛伐他汀组：大鼠造模后给予辛伐他汀混悬液灌胃。持续干预3个月,行为学检测各组大鼠学习记忆情况,Western Blot检测突触前膜及后膜关键蛋白突触素、突触后密度蛋白95表达。实验方案经西部战区总医院动物实验伦理委员会批准,批准号为2019ky79。结果与结论：①行为学检测结果：与假手术组对比,慢性脑低灌注组大鼠的学习记忆明显受损,表现为：旷场实验的5 min总行程明显降低(P < 0.05),提示自主探索行为受损;定位航行实验中逃避潜伏期明显延长(P < 0.05),提示参考记忆受损;空间探索实验中大鼠穿越平台次数及目标象限时间均减少,说明空间探索能力下降。而辛伐他汀组上述指标均显著改善。②Western Blot检测结果：慢性脑低灌注组大鼠海马CA1区突触素及突触后密度蛋白95表达下降(P < 0.05),而辛伐他汀组这两种蛋白表达较溶剂组上升。③说明慢性脑低灌注状态可使大鼠学习记忆功能明显受损,认知水平下降;持续口服辛伐他汀3个月可改善慢性脑低灌注大鼠的认知功能;提示临床上辛伐他汀或可作为改善血管性认知障碍和痴呆患者预后的辅助用药。 ORCID: 0000-0003-3385-2659(牟子超) 中国组织工程研究杂志出版内容重点：组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程     

可乐定对慢性脑缺血大鼠学习记忆及ERK信号通路相关蛋白的影响

目的:研究可乐定(clonidine)对大鼠慢性脑缺血(ischemia)后认知功能的影响并初步探讨其神经保护作用机制。方法:将45只SD大鼠随机分为假手术(sham)组、脑缺血(ischemia)组和可乐定(clonidine)组,每组15只。通过大脑中动脉栓塞法建立慢性脑缺血大鼠模型。各组大鼠在术前1周连续灌胃给药,其中clonidine组每日以clonidine 100μg/kg灌胃,sham组和ischemia组以等体积蒸馏水灌胃。术后4周,用Morris水迷宫法检测各组大鼠的学习记忆能力,免疫组织化学法和Western blot法检测非磷酸化和磷酸化细胞外信号调节激酶1/2(ERK1/2)及环磷腺苷效应元件结合蛋白(CREB)的蛋白水平。结果:Morris水迷宫实验结果显示,与假手术组相比,脑缺血组大鼠学习和记忆能力减弱;与脑缺血组相比,可乐定组大鼠学习和记忆能力增强。免疫组织化学法和Western blot法检测结果表明,与假手术组比较,脑缺血组大鼠海马组织中p-ERK1/2和CREB的蛋白水平均增加(P0.01);与脑缺血组相比,可乐定组大鼠海马组织中p-ERK1/2和p-CREB的蛋白水平降低(P0.01)。结论:可乐定可能通过调节ERK信号通路相关蛋白ERK1/2和CREB的表达,从而改善脑缺血再灌注引起的学习记忆障碍。     

红景天苷对局灶性脑缺血再灌注大鼠突触超微结构的影响

目的研究红景天苷对局灶性脑缺血/再灌注损伤后突触结构和数密度的变化。方法采用线栓法制造大鼠大脑局灶缺血(2h)/再灌注模型(I/R模型),于灌注后1d、3d、7d、14d时间点断头取脑,电镜观察突触结构和数密度的变化。结果I/R模型组数目减少,7d降至最低,14d突触数目回升;突触结构随再灌注时间延长损伤加重,14d有所恢复;红景天组突触损害程度减轻,突触数目增加(P<0.05),突触数密度恢复的时间提早至7d。结论红景天苷可以减轻脑缺血再灌注后突触的损伤,易化突触可塑性。     

Relationship between cerebrospinal and peripheral S100B levels after focal cerebral ischemia in rats

S100B is a 21-kDa, Ca(2+)-binding protein that is expressed in the central nervous system. Although the peripheral S100B level is significantly correlated with stroke outcome, the mechanisms responsible for increase in the peripheral S100B level have not been precisely investigated in animal ischemic stroke models. To justify the use of peripheral S100B as a common biomarker between stroke patients and animal models, the mechanisms responsible for increases in the peripheral S100B level after focal cerebral ischemia should be clarified. In the present study, we investigated correlations between the cerebrospinal and serum S100B levels to determine whether increase in peripheral S100B properly reflect the conditions inside the central nervous system. From each rat, cerebrospinal fluid and serum samples were collected at 24, 48, 72, or 120 h after the onset of photochemically induced thromboembolic stroke in rats. Our results indicated a difference in the kinetics of cerebrospinal and serum S100B. Among the four sampling points, the serum S100B levels were most strongly correlated with the cerebrospinal S100B levels at 48 h after PIT stroke onset. While the serum S100B level may be a useful biomarker of stroke in experimental or clinical studies, the timing of S100B measurements should be carefully selected to ensure that the serum S100B level properly reflects the conditions in the central nervous system.     

星形胶质细胞在脑缺血诱导的炎症反应中的作用及其机制

脑缺血诱发的炎症反应在急性期可引发脑水肿,挤压缺血灶周围正常脑组织,从而加重神经功能损伤;而在卒中恢复期,对神经组织进行修复具有重要保护作用。近年研究发现星形胶质细胞(Ast)也参与脑缺血后的炎症反应,通过产生抑炎/促炎因子及形成胶质瘢痕/胶质限制对脑组织兼具保护和损伤双重作用,多条信号通路参与这一过程,此外,其与小胶质细胞协同作用也越来越受到重视。靶向调控星形胶质细胞调节脑缺血后炎症反应、促进康复为缺血性卒中治疗和新药研发指明了新的方向。     

Copolymer-1 (Cop-1) improves neurological recovery after middle cerebral artery occlusion in rats

The damage in ischemic stroke is caused by two events: (i) the ischemic phenomenon by itself; (ii) the self-destructive mechanisms developed as a consequence of ischemia. The inflammatory response is one of these destructive phenomena that accompanies and exacerbates the developing injury. Since it has been suggested that immune cells participate in neuroprotective and restorative processes, modulation rather than elimination of this inflammatory response could be a strategy to improve the neurological outcome. The immune modulator copolymer-1 (Cop-1), a synthetic basic random copolymer of amino acids, is a potent inducer of Th2 regulatory cells which, aside from exerting modulatory actions, is capable of releasing neurotrophic factors. There is evidence that Cop-1-specific T cells exert neuroprotective and even restorative effects in diverse neurodegenerative diseases. In order to test the ability of Cop-1 to prevent ischemic injury in a model of transient middle cerebral artery (MCA) occlusion, two groups of rats were treated either with Cop-1 or with saline solution (SS). Seven days after occlusion, Cop-1 treated rats presented a significant improvement in neurological function compared to SS-treated animals (1.2+/-0.4 and 2.8+/-0.5 mean+/-S.D., respectively; p=0.008). Histological findings showed that the percentage of infarct volume was smaller in Cop-1 treated rats (4.8+/-1.5), in comparison with those receiving SS (32.2+/-8.6; p=0.004). Cop-1 constitutes a promising therapy for stroke; thereby, the enforcement of further experimental investigation is encouraged in order to be able to formulate the best strategy.     

Effect of short-term cerebral ischemia on the mesenteric microcirculation in rats

The effect of cerebral ischemia produced by compression of both common carotid arteries on the mesenteric microcirculation was studied in experiments on rats. The extent and intensity of the microcirculatory disturbances were shown to depend on the duration of ischemia and of the postischemic period. The state of the systemic hemodynamics was compared with that of the mesenteric microcirculation. The possible mechanisms of the microcirculatory disturbances are discussed.Laboratory of General Pathology and Experimental Therapy, Institute of General Pathology and Pathological Physiology, Academy of Medical Sciences of the USSR, Moscow. Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 88, No. 7, pp. 9–12, July, 1979.     

红景天苷对局灶性脑缺血再灌注大鼠神经生长相关蛋白的影响

目的研究红景天苷对局灶性脑缺血/再灌注损伤(I/R)后神经生长蛋白(GAP-43)表达的影响。并探讨其可能的机制。方法Wistar大鼠随机分为假手术组、I/R模型组和红景天苷组,采用线栓法制造大鼠大脑中动脉阻塞/再灌注(MCAO/R)模型,MCAO2h后恢复再灌注。用免疫组化方法检测再灌注后1d、3d、7d、14d、21d的与个时间点GAP-43的表达。结果红景天苷明显减小梗死灶范围,梗死灶周围皮质神经元损伤明显减轻。假手术组中枢神经系统GAP-43表达较少,I/R组GAP-43阳性表达,在术后1d开始增高,3d表达最强,高水平维持到7d,14d明显降低,但未降至正常水平。红景天苷组各个时间点GAP-43阳性表达强度均显著高于I/R对照组(P<0.05)。结论红景天苷能提高脑缺血/再灌注后GAP-43的表达,促进轴突生长,易化脑缺血再灌注损伤后神经可塑性。     

大鼠脑缺血后突触超微结构的变化

目的：探讨脑缺血损伤对突触的影响。方法：采用大鼠，制成脑缺血模型，应用透射电镜观察大脑顶叶皮质突触的变化。结果：随着缺血时间的延长，神经毡内突触数目逐渐减少；突触结构中突触小泡、线粒体也发生改变。缺血48h，突触小泡减少，甚至消失；线粒体变性、减少乃至消失，嵴减少或消失呈空泡状。突触前后膜被破坏，典型的突触结构已不存在。结论：脑缺血后，随缺血时间延长，突触结构异常，突触密度下降。     

Lubeluzole and conditioned learning after cerebral ischemia

Lubeluzole [S-4-(2-benzothiazolylmethylamino)--((3,4-difluorophenoxy)methyl)-1-piperidineethanol] reduces the severity of cerebral injury in animal models of brain ischemia. Its beneficial effects may include decreased concentration of extracellular glutamate, blockade of sodium and calcium channels, and attenuation of nitric oxide-mediated neuronal death. Previous studies have shown that global cerebral ischemia in rabbits impaired the subsequent acquisition of a trace-conditioned eyeblink reflex. Here, we examined the effect of preischemic treatment with lubeluzole on the acquisition of a trace-conditioned eyeblink response after 6.5 min of global cerebral ischemia. Three groups of rabbits underwent cerebral ischemia: one group underwent ischemia alone (I) and two groups underwent ischemia and also received lubeluzole (L₁, 1.25 mg/kg, and L₂, 2.5 mg/kg). All animals were subsequently trained using classical trace conditioning. Each training session consisted of the presentation of the conditioned stimulus (an 85-dB, 6-kHz auditory tone lasting for 100 ms) followed by a trace interval (a period of 300 ms during which no external stimulus was delivered) followed finally by the delivery of the unconditioned stimulus (a 150-ms puff of air directed at the cornea). We found that animals receiving preischemic administration of 1.25 mg/kg of lubeluzole demonstrated a significantly improved acquisition of the trace-conditioned reflex as compared to animals that did not receive lubeluzole. This finding demonstrates improved long-term neurobehavioral outcome with preischemic administration of 1.25 mg/kg of lubeluzole.This study was partially supported with funds from grant NINDS R01 NS29403–08 (Zornow), 12/1/96–11/30/01 and from a grant from the Foundation for Anesthesia Education and Research (Mueller), 7/1/02–6/30/04     

银杏叶提取物对局灶性脑缺血再灌注不同时段的大鼠脑组织GFAP的影响

目的观察银杏叶提取物(extract of Ginkgo biloba,EGB)对大鼠局灶性脑缺血再灌注梗死区胶质纤维酸性蛋白(GFAP)表达的影响。方法采用改良线栓法建立大鼠大脑中动脉阻塞脑缺血再灌注模型。观察再灌注1～4d里大鼠神经功能缺损程度并应用免疫组织化学法、Metamoph图像分析系统对结果进行分析。结果EGB药物组神经功能评分较缺血再灌组好(P<0.05),GFAP阳性细胞于脑缺血2h再灌注24h后即已出现,48、72、96h阳性细胞表达量增加,其中以72h为最多,EGB可抑制缺血后GFAP的表达(P<0.05)。结论局灶性脑缺血后可诱导脑组织GFAP表达增强,EGB可抑制脑缺血再灌注后星形胶质细胞GFAP的高表达,提示EGB对缺血诱导的星形胶质细胞活化具有抑制作用,可能对脑缺血损伤的恢复起重要作用。     

大鼠局灶性脑缺血模型的改进

本研究旨在改进SD大鼠的局灶性脑缺血模型的制作方法。 1%的戊巴比妥钠腹腔内注射麻醉动物 ,采用线栓法制作大鼠大脑中动脉栓塞模型。采用 3种不同的手术方法完成手术 ,1组不分离迷走神经节 ,不结扎翼腭动脉 ;2组分离保护迷走神经节、结扎翼腭动脉 ;3组分离并保护迷走神经节 ,但暂时阻断翼腭动脉。 1、2和 3组的手术死亡率分别为 33%、7%和 10 % (P <0 0 5 ) ,成功率分别是 6 0 %、80 %和 85 % ;与 1、2组相比 ,3组的手术费时短 (P<0 0 1)、创伤小。因而分离并保护迷走神经节是降低局灶性脑缺血模型手术死亡率的重要手段 ,从而成功制作大鼠的局灶性脑缺血模型。     

小鼠颈动脉系解剖与测量在局灶性脑缺血模型中的应用

目的　系统解剖与测量小鼠颈动脉系统 ,为小鼠局灶性脑缺血模型的制作提供参数。方法　在手术显微镜下 ,解剖小鼠颈动脉系后 ,用油标卡尺测定从颈总动脉分叉至各部的长度 ,结果以均数表示。并对尼龙单丝线末端的处理进行了较详细的研究。结果　小鼠颈总动脉分叉至大脑前中动脉分叉处的长度较恒定 ,具体为 (8 2 9± 0 5 4 )mm。尼龙单丝线末端经高温处理后 ,缩短的距离不同 ,所形成的球径不同 ,以缩短 1mm效果较好。结论　小鼠局灶性脑缺血模型制作时 ,从颈总动脉分叉至大脑前中动脉分叉处插线的深度不能超过 8 2 9mm。     

慢性脑缺血大鼠大脑皮质中的神经生长因子表达

目的：研究慢性脑缺血时大鼠大脑皮质中神经生长因子（NGF）的表达变化,探讨缺血性脑损伤及修复机制。方法：永久性结扎Wistar大鼠双侧颈总动脉,取慢性脑缺血30、120d组。行为学测试,免疫组化ABC法染色,计数大鼠大脑皮质中的NGF阳性神经元数及测量平均灰度值。结果：大鼠慢性脑缺血时,大脑皮质中NGF的表达,第120d比第30d及对照组显著增强,而30d与对照组无显著性差异,同时伴有学习和记忆力下降。结论：慢性脑缺血时,NGF在大脑皮质中的表达将随时间逐渐增强,对坏死神经元起保护作用。     

脱氢表雄酮对血管性痴呆小鼠学习和记忆能力的改善作用

目的:研究脱氢表雄酮(dehydroepiandrosterone,DHEA)对血管性痴呆小鼠学习和记忆能力的改善作用及可能机制。方法:将小鼠随机分为假手术组、模型组及DHEA(20、40和60 mg/kg)组。采用夹闭小鼠双侧颈总动脉15 min再放开的方法,建立全脑缺血再灌注所致的血管性痴呆小鼠模型。通过Y迷宫和新物体辨别实验测试小鼠的学习和记忆能力;采用Western blot法检测小鼠海马组织神经元核抗原(NeuN)、突触小泡蛋白(SYP)和突触后致密蛋白95(PSD-95)的含量。结果:与假手术组相比,在Y迷宫和新物体辨别实验中,模型组小鼠出现显著的学习和记忆障碍,DHEA治疗能显著增加Y迷宫实验中小鼠自发交替反应率,同时还可显著提高小鼠新物体辨别实验的优先指数和辨别系数(P 0. 05),其中DHEA中剂量组效果最为显著(P 0. 01)。Western blot实验结果显示,模型组小鼠海马组织NeuN、SYP和PSD-95的表达水平与假手术组比显著降低(P 0. 05); DHEA组小鼠海马组织NeuN、SYP和PSD-95蛋白的表达较模型组显著增多(P 0. 05)。结论:DHEA具有提高血管性痴呆小鼠学习和记忆能力的作用,其机制可能与减少神经元的丢失和改善突触的可塑性有关。