γ-氨基丁酸及其受体在大鼠纹状体边缘区的表达

目的观察γ-氨基丁酸(GABA)及其受体GABARB1mRNA在纹状体边缘区的表达,探讨GABA对边缘区学习记忆功能的调控。方法应用免疫细胞化学方法观察GABA及其合成酶谷氨酸脱羧酶(GAD)在纹状体边缘区的分布。用分子原位杂交方法观察GABA受体GABARB1mRNA在纹状体边缘区内的表达。结果在纹状体边缘区内可见密集的GABA及GAD免疫阳性纤维及少量胞体,在皮层、海马等处也可见阳性纤维及胞体。边缘区内可见许多GABARB1mRNA表达阳性的细胞,尾壳核内只有少量GABARB1mRNA阳性细胞分布,皮层、海马等处也呈GABARB1mRNA阳性表达。结论证实边缘区存在着GABA及其受体的表达,表明存在着抑制性氨基酸对边缘区的调控,推测GABA通过抑制突触前递质的释放及调控其他神经递质来影响边缘区的学习记忆功能。     

N—甲基—D—门冬氨酸2B受体mRNA在纹状体边缘区的表达

目的 通过研究N－甲基－D－门冬氨酸（N-methyl-D-asparate,NMDA)2B受体是否在纹状体边缘区表达,从而在基因分子方面确定边缘区在学习记忆过程中的作用。方法 用地高辛标记多相探针方法,原位检测大鼠纹状体边缘区内NMDA2B受体表达。结果 原位杂交结果发现NMDA2B 受体mRNA阳性信号在纹状体内分布不均匀,主要见于尾壳核,在尾壳核和苍白球间的边缘区部位可见中等大小梭形神经元,呈密集的带状分布,而苍白球只有少量的阳性胞体。结论 大鼠纹状体边缘区可以合成NMDA2B受体,推测边缘区的学习记忆功能与NMDA受体有关。     

大鼠脑纹状体边缘内区5—HT2A受体的分布

已知纹状体边缘区内有密集的五羟色胺纤维及终末分布,在此认识的基础上观察－５Ｈ２Ａ受体ｍＲＮＡ是否在大鼠纹状体边缘区内表达,从基因分子水平和细胞水平进一步证明大鼠纹状体边缘区能否合成５－ＨＴ２Ａ受体。方法用地高辛标记的寡核苷酸地进行原位杂交,研究大鼠纹状体边缘区内５－ＨＴ２Ａ受体ｍＲＮＡ的表达及分布。     

大鼠脑纹状体边缘区内5-HT2A受体的分布

目的 已知纹状体边缘区内有密集的五羟色胺（5-HT）纤维及终末分布,在此认识的基础上观察5-HT2A 受体mRNA是否在大鼠纹状体边缘区内表达,从基因分子水平和细胞水平进一步证明大鼠纹状体边缘区能否合成5-HT2A受体。方法 用地高辛标记的寡核苷酸探针进行原位杂交,研究大鼠纹状体边缘区内5-HT2A 受体mRNA的表达及分布。结果 原位杂交结果发现,5-HT2A受体 mRNA阳性杂交信号在纹状体内的分布不均匀,尾壳核内只有少量中等大小的阳性胞体,苍白球内也只有少量较大的阳性胞体,而在尾壳核和苍白球之间的边缘区部位则可见许多中等大小的梭形阳性神经元胞体,并呈现密集的带状分布。免疫组织化学结果观察到5-HT受体阳性神经元胞体在纹状体内的分布与原位杂交结果一致。结论 推测大鼠纹状体边缘区内可以合成5-HT2A受体,具有接受和整合5-HT神经递质的功能。     

纹状体边缘区的结构和功能研究进展

作者于1987年在纹状体内发现一个新区，根据其部位命名为边缘区。十余年来我们对边缘区的结构和功能进行了系统的研究。边缘区的结构跟纹状状体其余部位不同，功能主要与学习记忆有关。边缘区的研究已经得到了国内外学者的确认。对边缘区进一步的深入研究，将对提高人们的智力，防治老年性痴呆症等智力障碍性疾病等方面有重要的理论和实践意义。     

N-甲基-D-门冬氨酸2B受体mRNA在纹状体边缘区的表达

目的 通过研究N-甲基-D-门冬氨酸（N-methyl-D-asparate, NMDA）2B受体是否在纹状体边缘区表达,从而在基因分子方面确定边缘区在学习记忆过程中的作用。方法 用地高辛标记多相探针方法,原位检测大鼠纹状体边缘区内NMDA 2B受体表达。结果 原位杂交结果发现NMDA 2B受体mRNA阳性信号在纹状体内分布不均匀,主要见于尾壳核,在尾壳核和苍白球间的边缘区部位可见中等大小梭形神经元,呈密集的带状分布,而苍白球只有少量的阳性胞体。结论 大鼠纹状体边缘区可以合成NMDA 2B受体,推测边缘区的学习记忆功能与NMDA受体有关。     

大鼠纹状体边缘区和海马的功能联系研究

目的：研究纹状边缘区与具学习记忆功能的重要脑区－海马之间是否存在功能联系。方法：用神经系功能活动形态定位法，将低浓度的海人藻酸作为化学刺激剂注射于大鼠海马，用免疫组化法观察c-fos原癌基因在脑内的表达，结果：c-Fos在海马，杏仁核，终纹床核，大脑皮层等部位有强烈表达，在纹状体中，c-fos表达成条带状集中分布在边缘区，而在尾壳核和苍白球少有表达。结论：海马与纹状体边缘区存在密切的功能联系。     

纹状体边缘区的结构和功能研究进展

作者于1987年在纹状体内发现一个新区,根据其部位命名为边缘区。十余年来我们对边缘区的结构和功能进行了系统的研究。边缘区的结构跟纹状体其余部位不同,功能主要与学习记忆有关。边缘区的研究已经得到了国内外学者的确认。对边缘区进一步的深入研究,将对提高人们的智力、防治老年性痴呆症等智力障碍性疾病等方面有重要的理论和实践意义。     

学习记忆过程中即刻早期基因c—fos、c—jun在纹状体边缘区的表达

OBJECTIVE: To study the expression of immediate-early genes c-fos and c-jun in the marginal division (MrD) of rat striatum during learning and memory. METHODS: After Y-maze training in rats, the expression of immediate-early genes c-fos and c-jun in the MrD was investigated immunocytochemically. RESULTS: After 1 h of Y- maze training, the expression of c-Fos and c-Jun proteins was significantly enhanced in the MrD, where c-Jun protein in particular was more intensely expressed than in other parts of the striatum. The training group showed significantly higher expressions of the 2 proteins than pseudotraining group (P<0.01). In addition, positive expression was also observed in the hippocampus, cingulum cortex and other parts of the brain. CONCLUSION: Immediate-early genes c-fos and c-jun in the MrD participate in the signal transduction during learning and memory processes in the courses of Y-maze training of the rats.     

γ-氨基丁酸及其受体在大鼠脊髓疼痛传导通路中的表达

目的 研究福尔马林致痛大鼠腰膨大段脊髓背角γ-氨基丁酸(GABA)及GABAAβ3受体mRNA的表达变化.方法 32只健康雄性SD大鼠随机分为4组:空白对照组(n=8)、致痛对照组(n=8)、置入导管对照组(n=8)及置入导管给药组(n=8).致痛大鼠采用福尔马林炎性痛模型,观察致痛后大鼠疼痛退缩反应,并分别应用免疫组织化学和原位杂交方法 比较致痛24 h后大鼠腰膨大段脊髓背角两侧GABA免疫阳性细胞和GABAAβ3受体mRNA的表达差异.结果 在福尔马林致痛后鞘内注射蝇萆醇可抑制大鼠第2期的退缩反应,其退缩反应数明显低于致痛对照组和置入导管对照组(P<0.05).致痛24h后,GABA免疫反应神经元在致痛对照组和置入导管对照组致痛侧腰段脊髓背角Ⅰ～Ⅲ层有大量表达,与各自组的非致痛侧及空白对照组两侧相比数量明显增加(P<0.05),置入导管给药组在两侧脊髓的表达与空白对照组两侧、致痛对照组和置入导管对照组非致痛侧比较无明显差异(P>0.05).与致痛对照组和置入导管对照组致痛侧比较数量明显减少(P<0.05).GABAAβ3受体mRNA阳性细胞在致痛对照组和置入导管对照组两侧腰段脊髓背角第Ⅱ和第Ⅲ层有大量表达,分别与空白对照组和置入导管给药组比较,其数量明显增加(P<0.05),置入导管给药和空白对照组相比,其数量无明显差异(P>0.05).结论 GABA及其GABAAβ3受体参与了脊髓对外周伤害性刺激的应答及调控.     

P物质和受体在纹状体边缘区内的分布及其与学习记忆功能的关系

目的 研究纹状体边缘区内的P物质和受体的分布特点及其与学习记忆功能的关系。方法 用免疫组化。原位杂交方法研究纹状体边缘区内P物质及其受体的分布特点，再用受体基因封闭方法结合迷宫行为试验研究P物质受体与边缘区学习记忆功能的关系。结果 纹状体边缘区内有大量的P）物质免疫阳性纤维及受体蛋白和NK1mRNA的分布，封闭纹状体边缘区内的P物质受体基因后，大鼠的学习记忆能力显著下降。结论 纹状体边缘区内的P物质和受体对纹状体边缘区的学习记忆功能有重要作用。推测这种作用是P物质通过其受体NK1调节边缘区中的5-HT等神经递质来实现的。     

Effects of kainic acid that damages the marginal division of rat striatum on hippocampal long-term potentiation]

OBJECTIVE: To investigate the relationship between the marginal division (MrD) of the striatum and other brain regions associated with learning and memory. METHODS: Long-term potentiation (LTP) was induced by high-frequency stimulation of the perforant path-dentate gyrus, and changes in hippocampal LTP after destruction of the marginal division with kainic acid were observed. RESULTS: High-frequency stimulation of the perforant path produced significant increases in the peak amplitudes of the population spike (PS) in normal rats and those receiving saline treatment. In rats with damaged MrD, the increase in PS and the excitatory postsynaptic potential were less obvious compared with normal or saline-treated rats, indicating that the LTP of the hippocampus was attenuated by damage of the MrD. CONCLUSION: Damage of the MrD impacts the LTP formation in the hippocampus.     

Ultrastructure of the marginal division in the rat striatum.

The discovery of a new subdivision in the striatum of the rat, the marginal division, has recently been reported. The marginal division is located at the caudal extent of the striatum, surrounding the rostrolateral border of the globus pallidus, and has different cellular morphology, immunohistochemistry and an efferent projection pattern from those of the main body of the striatum. In the present study, the ultrastructural organization of the marginal division was investigated. Most neuronal somata in the marginal division were fusiform in shape and had a large pale oval nucleus without in-foldings. There were four types of synapses in the marginal division: axo-somatic, axo-dendritic, axo-spinous and axo-axonic. Both symmetric and asymmetric synapses were observed on the somata, dendrites, or dendritic spines. Most of the symmetric synapses contained pleomorphic vesicles, whereas the asymmetric ones contained mainly round vesicles. Individual axo-axo-spinous synapses, which were first described in the striatum, were also observed in the marginal division. These ultrastructural characteristics distinguish the marginal division from the rest of the striatum.

     

大鼠纹状体边缘区内烟碱型乙酰胆碱受体mRNA的表达

目的研究纹状体边缘区内有无乙酰胆碱受体（ｎＡＣｈＲ）的分布。方法用地高辛标记的 ｎＡＣｈＲ ｃＤＮＡ作为探针， 与大鼠脑切片进行原位杂交。结果大鼠脑纹状体内可见较多的ｎＡＣｈＲ阳性神经元，其中尾壳核中可见较多中等大小 的多极阳性神经元，在尾壳核和苍白球之间的边缘区部位，可见较多阳性梭形细胞，呈密集的带状分布。结论纹状体边 缘区内存在 ｎＡＣｈＲ ｍＲＮＡ的表达，推测边缘区内的 ｎＡＣｈＲ阳性神经元对调节边缘区的学习记忆功能有重要作用。     

The afferent connections and its immunohistochemical characteristics of the marginal division in the rat corpus striatum

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P物质和受体在纹状体边缘区内的分布及其与学习记忆功能的关系

目的研究纹状体边缘区内的P物质和受体的分布特点及其与学习记忆功能的关系。方法用免疫组化、原位杂交方法研究纹状体边缘区内P物质及其受体的分布特点,再用受体基因封闭方法结合迷宫行为试验研究P物质受体与边缘区学习记忆功能的关系。结果纹状体边缘区内有大量的P物质免疫阳性纤维及受体蛋白和NK1mRNA的分布,封闭纹状体边缘区内的P物质受体基因后,大鼠的学习记忆能力显著下降。结论纹状体边缘区内的P物质和受体对纹状体边缘区的学习记忆功能有重要作用,推测这种作用是P物质通过其受体NK1调节边缘区中的5-HT等神经递质来实现的。     

Expression of c-fos and c-jun proteins in the marginal division of the rat striatum during learning and memory training

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.     

海人藻酸毁损大鼠纹状体边缘区后对海马长时程增强的影响

目的研究纹状体边缘区与脑内其他与学习记忆有关脑区间的关系。方法高频刺激穿通纤维-齿状回通路在海马诱发长时程增强(LTP),观察海人藻酸毁损纹状体边缘区后对海马LTP的影响。结果高频刺激穿通通路后,正常组和盐水对照组的群体峰电位幅度显著增加;毁损组动物在高频刺激后,群体峰电位增加幅度明显低于正常组和盐水对照组,毁损组的兴奋性突触后电位也明显低于正常组和盐水对照组。表明毁损边缘区后海马LTP明显降低。结论毁损纹状体边缘区后对海马LTP的形成有一定影响。