首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
目的探讨γ-氨基丁酸(γ-aminobutyric acid,GABA)能神经元在丙泊酚缓解抑郁大鼠电休克(electroconvulsive shock,ECS)后学习记忆损伤中的作用。方法将慢性温和不可预见性应激(chronic unpredictable mild stress,CUMS)法建模成功的36只抑郁症模型大鼠随机分为丙泊酚+电休克组、电休克组和抑郁组,另设同批次未建模的12只健康大鼠为对照组。丙泊酚+电休克组用丙泊酚联合电休克治疗,电休克组行电休克治疗,抑郁组与对照组行伪电休克处理。治疗完毕行Morris水迷宫实验评估大鼠空间学习记忆能力;ELISA法检测海马GABA浓度;免疫组化法和Western-blot检测海马GABAARα5的蛋白表达。结果Morris水迷宫实验结果提示,电休克组逃避潜伏期最长,空间探索时间最短(P<0.05);电休克组和丙泊酚+电休克组比抑郁组逃避潜伏期延长,空间探索时间缩短(P<0.05);与对照组比较,其余各组逃避潜伏期缩短,空间探索时间延长(P<0.05)。蛋白表达方面,与对照组相比,抑郁组GABA含量下降,GABAARα5表达水平降低(P<0.05),电休克组和丙泊酚+电休克组GABA含量和GABAARα5蛋白表达升高(P<0.05);与电休克组相比,丙泊酚+电休克组GABA含量下降,GABAARα5蛋白表达升高(P<0.05)。结论丙泊酚在电休克过程中具有脑保护作用,其机制可能与上调海马GABA能神经系统相关递质和受体的表达有关。  相似文献   

2.
无抽搐电休克治疗大鼠抑郁症的谷氨酸能机制研究   总被引:3,自引:1,他引:2  
目的 观察抑郁大鼠电休克治疗后海马内谷氨酸含量以及N-甲基-D天门冬氨酸(NMDA)受体的表达,探讨电休克治疗抑郁症的谷氨酸能神经机制.方法 36只SD大鼠随机分为无抽搐电休克组(电休克组)、抑郁模型对照组(抑郁组)、对照组,每组12只.前两组采用孤养加慢性不可预见性应激建立抑郁模型,建模后电休克组在丙泊酚麻醉下行无抽搐电休克治疗,隔天1次共2周.检测各组海马谷氰酸含量和海马CA1区、CA3区NMDA受体2B亚单位(NMDA-NR2B)的表达.结果 ①电休克治疗后电休克组大鼠水平移动格数、垂直竖立次数和糖水消耗量都高于抑郁组(P<0.01).②电休克组大鼠海马内谷氨酸含量低于抑郁组(P<0.01),而抑郁组高于正常组(P<0.01).③电休克组大鼠海马CA1区和CA3区NMDA-NR2B的表达量高于正常组(P<0.05),而抑郁组低于正常组(P<0.01).结论 无抽搐电休克治疗可抑制抑郁症模型大鼠海马内谷氨酸含量的升高并使NMDA-NR2B的表达量上调,这可能足其抗抑郁机制之一.  相似文献   

3.
目的探讨无抽搐电休克对抑郁大鼠学习记忆功能的影响及其突触可塑性机制。方法SD大鼠50只随机分为无抽搐电休克(MECT)组、电休克(ECT)组、丙泊酚组、抑郁模型组(简称抑郁组)、正常对照组(简称对照组)各10只,前4组采用孤养结合慢性不可预见轻度应激制备抑郁模型。建模成功后,MECT组和ECT组每日1次分别腹腔注射丙泊酚和生理盐水后给予电刺激,丙泊酚组腹腔注射丙泊酚但不给予电刺激,连续7d。采用openfield和Morris水迷宫分别评定行为学和学习记忆功能的改变,免疫组织化学法和逆转录聚合酶链反应检测海马突触素(SYP)及其mRNA的表达。结果治疗后MECT组和ECT组的openfield评分均分别明显高于丙泊酚组和抑郁组,差异有统计学意义(P0.05);ECT组Morris水迷宫测验的逃避潜伏期较MECT组、丙泊酚组及抑郁组延长而空间探索时间缩短(P0.05);MECT组和ECT组较丙泊酚组、抑郁组SYP蛋白及其mRNA表达明显升高(P0.05),而MECT组较ECT组的表达减少(P0.05)。结论丙泊酚可改善抑郁大鼠电休克后学习记忆功能,其机制可能与抑制电休克后海马SYP的过度表达有关。  相似文献   

4.
目的 建立多药耐药性癫痫模型,观察海马组织γ-氨基丁酸(GABA)受体表达变化从而探讨其在耐药性杏仁核点燃癫痫形成中的作用.方法 选用Wistar大鼠100只制作慢性杏仁核点燃癫痫模型,模型制作成功(n=52)后用经典抗癫痫药苯妥英钠和苯巴比妥进行筛选,根据大鼠对苯妥英钠和苯巴比妥的反应区别出耐药癫痫大鼠(n=8)及药物敏感大鼠(n=8),然后处死动物留取脑组织标本,用免疫组织化学染色方法观察海马组织内GABAA受体表达变化,用蛋白质印迹法检测GABAA受体含量,观察耐药癫痫大鼠和药物敏感大鼠之间的不同.结果 耐药癫痫性颞叶大鼠海马细胞变性坏死,排列紊乱,结构特征消失;耐药性颞叶癫痫大鼠海马组织内GABAA受体阳性表达细胞的灰度值(141.15±14.72)比药物敏感大鼠增高(92.56 ±5.17;t =3.380,P=0.006);蛋白质印迹方法提示受体条带变淡变窄,蛋白含量明显减少(0.38 ±0.08),与药物敏感大鼠(0.88 ±0.18)比较,差异具有统计学意义(t=5.420,P=0.002);但两组间GABAA受体阳性细胞数百分率比较差异无统计学意义.结论 耐药性颞叶癫痫大鼠海马组织内GABA受体表达明显减少,这可能在耐药性颞叶癫痫的形成过程中发挥部分作用.  相似文献   

5.
目的观察γ-氨基丁酸(GABA)对体外大鼠培养神经元GABAA受体亚单位mRNA表达的影响,探讨肝性脑病(HE)发病机制。方法采用原位杂交技术,观察GABA对体外培养新生大鼠神经元GABAA受体亚单位α1β1γ2mRNA表达的改变。结果与对照组相比,GABA组神经元GABAA受体亚单位α1及γ2(增幅14%,P<0.01)的mRNA表达显著上升,亚单位β1的mRNA表达显著减少(降幅11%,P<0.05)。结论GABA可通过影响GABAA受体亚单位的表达发挥其对肝性脑病的致病作用。  相似文献   

6.
托吡酯对大鼠脑缺血再灌注损伤的神经保护作用   总被引:2,自引:0,他引:2  
目的探讨托吡酯(TPM)对大鼠脑缺血再灌注损伤的神经保护作用及其机制。方法将健康30只雄性SD大鼠随机分为假手术组、缺血再灌注组和TPM干预组。用线栓法建立大鼠脑缺血再灌注模型,TPM干预组给予TPM80mg/kg腹腔注射,2次。缺血再灌注24h时进行神经功能评分、TTC染色法测量梗死体积、高效液相色谱分析法测定脑组织谷氨酸(Glu)及γ-氨基丁酸(GABA)的含量;免疫组化法检测GABAA受体阳性表达。结果(1)与缺血再灌注组比较,TPM干预组神经功能评分明显增高(P<0.01),脑梗死体积减少(P<0.05);(2)TPM干预组缺血侧脑皮质Glu含量显著低于缺血再灌注组(P<0.01),与假手术组比较差异无显著性;GABA含量显著高于假手术组和缺血再灌注组(均P<0.01);(3)TPM干预组缺血侧脑皮质GABAA受体阳性细胞数显著高于缺血再灌注组(P<0.01)。结论TPM对脑缺血再灌注损伤有神经保护作用,其机制可能为TPM降低兴奋性递质Glu水平、增加抑制性递质GABA的释放及GABAA受体的表达。  相似文献   

7.
目的观察异丙酚联合电休克对抑郁大鼠海马卡配因I(calpain I)-细胞周期依赖性蛋白激酶5(cyclin-dependent kinase 5,Cdk5)通路的影响。方法 SD大鼠50只随机分为抑郁模型组、异丙酚组、电休克组、异丙酚联合电休克组(简称联合组)和正常对照组各10只,前4组采用慢性轻度不可预见性应激建立抑郁模型。此后,抑郁模型组仅给予生理盐水,异丙酚组仅腹腔注射异丙酚,电休克组给予生理盐水加电刺激,联合组给予异丙酚加电刺激,对照组仅给予生理盐水,连续7d。采用open-field法评价抑郁状态,Morris水迷宫检测学习记忆功能,免疫组织化学法检测海马CA1区和CA3区calpain I的表达,western blot法和液闪法分别检测海马Cdk5的表达和活性,RT-PCR法检测calpain I及Cdk5 mRNA的表达。结果治疗后,电休克组和联合组的open-field评分高于抑郁模型组和异丙酚组,差异有统计学意义(P<0.05);电休克组的逃避潜伏期比抑郁模型组、异丙酚组和联合组延长而空间探索时间缩短(P<0.05);电休克组的calpain I和Cdk5的蛋白及mRNA表达与Cdk5的活性均高于抑郁模型组、异丙酚组(P<0.05),联合组的Cdk5蛋白及mRNA表达高于抑郁模型组和异丙酚组(P<0.05),而联合组较电休克组的表达减少[CA1区calpain I蛋白:(0.15±0.03)vs.(0.20±0.03),CA3区calpain I蛋白:(0.17±0.03)vs.(0.22±0.03),calpain I mRNA:(0.58±0.02)vs.(0.82±0.05),Cdk5蛋白:(0.76±0.05)vs.(1.13±0.05),Cdk5 mRNA:(0.46±0.01)vs.(0.63±0.03),Cdk5活性:(3272.92±137.57)vs.(5770.24±202.26)]。结论异丙酚减轻抑郁大鼠电休克处理后学习记忆损害,其机制可能与异丙酚降低了电休克处理后calpain I-Cdk5通路的表达有关。  相似文献   

8.
目的 探讨褪黑素(Mel)抗癫痫作用的机制.方法 采用匹罗卡品(PILO)诱导大鼠癫痫持续状态(SE)模型,用免疫组化技术检测大鼠SE后4个时相点即6 h、48 h、72 h和7 d海马γ-氨基丁酸(GABA)和GABAA受体α5(GABAARα5)亚单位表达的动态变化,以及Mel对其变化的影响.结果 PILO组大鼠SE后6h,海马内GABA能神经元和GABAARα5亚单位表达均开始减少,尤其以SE后72 h~7 d改变最为明显,与对照组比较差异有极显著意义(P<0.01);而Mel组大鼠在SE后72 h~7 d,海马各区的GABA能神经元和GABAARα5亚单位表达均显著高于PILO组大鼠(P<0.05).结论 Mel可能通过上调GABA和GABAARα5亚单位的表达来发挥抗癫痫作用.  相似文献   

9.
目的 观察大鼠海马神经元在激活物作用下γ-氨基丁酸(GABA。)受体的表达,进一步探讨癫痫发病机制。方法 将大鼠海马神经尢被戊四氮(PTZ)作用后的激活物(实验组)及无血清培养基(对照组)注入大鼠侧脑室后观察其行为、脑电图(EEG)及脑组织GABA,受体表达的变化。结果 实验组大鼠注射后15~30min出现Ⅱ~Ⅲ级惊厥反应,EEG呈短程中高幅尖波、尖慢复合波;对照组的行为及EEG未见异常;各时点实验组大鼠脑组织GABA、免疫反应阳性细胞表达明显低于对照组(均P〈0.05),对照组GABA,免疫反应阳性细胞广泛分布于大脑皮质、海马回、齿状回。结论 海马神经元激活物具有明显致痫作用,其致痫效应与GABAA受体含量下降有关。  相似文献   

10.
目的探讨全脑缺血-再灌注对成年大鼠海马CA1区GAD65表达的影响及意义。方法成年雄性SD大鼠24只,随机分为3组:假手术组(SH)、缺血-再灌注3d组(IR-3)及缺血-再灌注7d组(IR-7),每组8只。采用四动脉阻断法制作全脑缺血-再灌注模型,应用免疫组织化学方法检测海马CA1区谷氨酸脱羧酶(glutamic acid decarboxylase,GAD)同工酶GAD65的表达变化。结果与假手术组相比,IR-3组GAD65的表达明显增多,IR-7组恢复正常。结论GABA能中间神经元对缺血相对耐受;全脑缺血-再灌注3dGAD65的表达增多可能是一种代偿性的机制,以减轻脑缺血后的高兴奋性。  相似文献   

11.
12.
13.
A number of cross-sectional population studies have shown that a strong sense of coherence (SOC) is associated with various aspects of good perceived health. The association does not seem to be entirely attributable to underlying associations of SOC with other variables, such as age or level of education. OBJECTIVE: The aim of the study reported here was to determine whether SOC predicted subjective state of health. METHODS: The study was carried out as a two-way panel mail survey of 1976 individuals with 4 years interval for two collections of data. The statistical method used was multivariate cumulative logistic modeling. Age, initial subjective state of health, initial occupational training level, and initial degree of social integration were included as potential explanatory variables. RESULTS: A strong SOC predicted good health in women and men. CONCLUSIONS: SOC can be interpreted as an autonomous internal resource contributing to a favorable development of subjective state of health. SOC data should, however, be regarded as complementary to and not a substitute for information already known to be associated with increased risk of future ill health.  相似文献   

14.
Tubocurarine (Tc) effect on membrane currents elicited by acetylcholine (ACh) was studied in isolated superior cervical ganglion neurons of rat using patch-clamp method in the whole-cell recording mode. The "use-dependent" block of ACh current by Tc was revealed in the experiments with ACh applications, indicating that Tc blocked the channels opened by ACh. Mean lifetime of Tc-open channel complex, tau, was found to be 9.8 +/- 0.5 s (n = 7) at -50 mV and 20-24 degrees C. tau exponentially increased with membrane hyperpolarization (e-fold change in tau corresponded to the membrane potential shift by 61 mV). Inhibition of the ACh-induced current by Tc (3-30 microM/1) was completely abolished by membrane depolarization to the level of 80-100 mV. Inhibition of ACh-induced current was augmented at increased ACh doses. It is concluded that the open channel block produced by Tc is likely to be the only mechanism for Tc action on nicotinic acetylcholine receptors in superior cervical ganglion neurons of rat.  相似文献   

15.
Fine structural characteristics of synapses in the spiral organ of Corti were examined, with reference to differences between inner and outer haircell systems, and to location of neurons of origin of efferent axons. Surgical interruption of crossed olivocochlear bundle, of vestibular nerve, of facial nerve, and excision of superior cervical ganglia were used to determine the pathways of efferent axons. Interruption of the vestibular nerve near the brainstem results in degeneration of all efferent terminals on outer hair cells. Mid-line lesions at, and caudal to, the facial colliculus result in degeneration of about half of these efferent terminals. Efferent synaptic bulbs to the inner hair-cell system are small, of the order of one micron, and form type 2 junctions with afferent dendrites. They tend to have more large dense-core vesicles (about 80 nm) than the large efferent terminals of the outer hair-cell system, and appear to be the terminals of axons in the habenula perforata, which exhibit varicosities laden with large dense core vesicles. The varicosities are unaffected by excision of the superior cervical ganglia. So far as our material can reveal, it appears that the varicosities in the habenula perforata do not survive vestibular root interruption, nor do the efferent processes in the internal spiral bundle or at the base of inner hair cells. Most interestingly, the afferent processes of the inner hair-cell system, as identified for example by their relation to pre-synaptic bodies in the inner hair cells, are subject to a trans-synaptic reaction after severance of the vestibular root. They undergo a dramatic cytological transformation, characterized by increase of volume, engorgement with microtubules, microfilaments, microvesicles of various sizes, and clusters of lysosomes. Thus, both the efferent and afferent terminals of the inner hair-cell system show marked cytological differences from the corresponding terminals of the outer hair cell system.  相似文献   

16.
17.
Background Dementia occurs in the majority of patients with Parkinson’s disease (PD). Late onset of PD has been reported to be associated with a higher risk for dementia. However, age at onset (AAO) and age at baseline assessment are often correlated. The aim of this study was to explore whether AAO of PD symptoms is a risk factor for dementia independent of the general effect of age. Methods Two community-based studies of PD in New York (n = 281) and Rogaland county, Norway (n = 227) and two population-based groups of healthy elderly from New York (n = 180) and Odense, Denmark (n = 2414) were followed prospectively for 3–4 years and assessed for dementia according to DSM-IIIR. All PD and control cases underwent neurological examination and were followed with neurological and neuropsychological assessments. We used Cox proportional hazards regression based on three different time scales to explore the effect of AAO of PD on risk of dementia, adjusting for age at baseline and other demographic and clinical variables. Findings In both PD groups and in the pooled analyses, there was a significant effect of age at baseline assessment on the time to develop dementia, but there was no effect of AAO independent of age itself. Consistent with these results, there was no increased relative effect of age on the time to develop dementia in PD cases compared with controls. Interpretation This study shows that it is the general effect of age, rather than AAO that is associated with incident dementia in subjects with PD. Received in revised form: 22 December 2005  相似文献   

18.
19.
After a hopeful beginning, the social process of the reintegration of those with severe mental illness has come to a standstill. I am led to wonder whether "the community" really wants to live together with people suffering from severe mental illness, and if so, how closely? As long as the medical treatment of mental illness provided by the general practitioners is fundamentally deficient, as they are not able to prescribe the necessary interventions--such as out-patient psychiatric nursing, and service providers in the out-patient sector are content with offering increasingly intensive forms of care for the less seriously ill at the cost of the Social Welfare System--the reintegration of those with serious mental illness remains an illusion--which is mainly to the benefit of providers of residential care in homes and hostels.  相似文献   

20.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号