损伤性癫痫模型大鼠海马和额叶突触蛋白的动态表达

Objective To observe the time course of changes in synaptophysin (P38) expression in the cortex and hippocampus of rats with posttraumatic epilepsy (PTE), and explore the role of synaptic plasticity in the epileptogenesis of PTE. Methods Thirty-seven male Sprague-Dawley rats were randomized into normal control group (n=5), sham-operated group (n=12) with intracortical saline injection, and PTE model group (n=20) with stereotactic FeCl<,2> injection (0.1 mol/L, 10 μ1) into the motor cortex. The expression of P38 in the brain cortex and hippocampus of the rats was detected immunohistochemically at 1 h and 7, 14 and 30 days after the injections. Results Most of the rats with FeCl<,2> injection developed isolated epileptiform discharges soon alter the injection. Compared with the sham-operated groups, the rats in PTE group showed significantly decreased P38 expression in the right frontal cortex at all the time points of measurement (P<0.05). At 1 h after FeCl<,2> injection, P38 expression in the polymorphic layer, stratum lacunosum and stratum radiatum of the right hippocampai CA3 area and DG molecular layer underwent no significant changes (P>05), but at 7 days, the expression increased significantly in all the stratum regions of the right hippocampal CA3 area, and this high expression level was maintained till 30 days after the injection. Conclusion Synaptic plasticity alterations in relation to P38 expression changes in the cortex and hippocampus may play an important role in the epileptogenesis of PTE in this rat model.     

光动力疗法对人脑胶质瘤细胞存活率影响的实验研究

目的:探讨5-氨基乙酰丙酸(5-ALA)介导的光动力(ALA-PDT)对人脑胶质瘤细胞U251的治疗作用。方法:实验于2003-01/2004-05在解放军第一军医大学珠江医院全军神经医学研究所完成。将不同浓度的5-ALA加入到细胞培养基中,随之以激光辐照;固定浓度的5-ALA给予不同剂量的激光辐射。MTT法测定细胞存活率。结果:激光能量恒定于25.0J/cm时,ALA-PDT对U251细胞的杀伤力2在较低5-ALA浓度范围内,随着5-ALA的浓度的增高而增强。各组与对照组间相比较,差异均有显著性意义(F=770.12,P=0.0000)。在较高5-ALA浓度范围内,则存在着饱和现象;相同的5-ALA浓度下,细胞生存率随着激光能量的增加而下降。单用5-ALA或激光处理,均不对细胞造成显著杀伤。结论:5-ALA本身对细胞无明显毒性作用,其介导的PDT是很有前途的胶质瘤治疗方法。     

TNFR1及其突变体重组质粒的构建及肿瘤生物学功能的研究

[目的]构建TNFR1及其突变体重组质粒,研究TNFR1胞浆段结构域与sTNF-α肿瘤生物学功能的关系.[方法]通过RT-PCR和重叠PCR,构建TNFR 1-pEGFP-N1,Y236A-TNFR1-pEGFP-N1、ΔNSD-TNFR1-pEGFP-N1和△DD-TN FR 1-pEGFP-N1.采用荧光显微镜观察...