Enhanced neurogenesis in the dentate gyrus of the hippocampus following seizure activity, especially status epilepticus, is associated with ectopic residence and aberrant integration of newborn granule cells. Hilar ec...Enhanced neurogenesis in the dentate gyrus of the hippocampus following seizure activity, especially status epilepticus, is associated with ectopic residence and aberrant integration of newborn granule cells. Hilar ectopic granule cells may be detrimental to the stability of dentate circuitry by means of their electrophysiological properties and synaptic connectivity. We hypothesized that status epilepticus also increases ectopic granule cells in the molecular layer. Status epilepticus was induced in male Sprague-Dawley rats by intraperitoneal injection of pilocarpine. Immunostaining showed that many doublecortin-positive cells were present in the molecular layer and the hilus 7 days after the induction of status epilepticus. At least 10 weeks after status epilepticus, the estimated number of cells positive for both prospero homeobox protein 1 and neuron-specific nuclear protein in the hilus was significantly increased. A similar trend was also found in the molecular layer. These findings indicate that status epilepticus can increase the numbers of mature and ectopic newborn granule cells in the molecular layer.展开更多
We investigated the effects of ethanol extracted Scutellaria baicalensis（EESB） on spatial memory function and neurogenesis in the hippocampal dentate gyrus.Adult Sprague-Dawley rats were orally administered 50,100,o...We investigated the effects of ethanol extracted Scutellaria baicalensis（EESB） on spatial memory function and neurogenesis in the hippocampal dentate gyrus.Adult Sprague-Dawley rats were orally administered 50,100,or 200 mg/kg of EESB for 6 successive days.The radial-arm maze test showed that 200 mg/kg of EESB improved the spatial memory of adult rats.Confocal microscopy results showed that 100 mg/kg of EESB increased the number of bromodeoxyuridine（BrdU）-and neuron-specific nuclear protein-positive cells in the granular cell layer,and that 100 and 200 mg/kg of EESB increased the number of BrdU-/neuron-specific nuclear protein-positive cells in the sub-granular zone.200 mg/kg of EESB increased the number of BrdU-/glial fibrillary acid protein-positive cells in the subgranular zone.These findings indicate that EESB can effectively promote neurogenesis in the hippocampal dentate gyrus and improve spatial memory function.展开更多
目的:制作新生小鼠脑瘫模型,并通过行为学、形态学检测模型的稳定性,为脑瘫的基础研究提供较为理想的动物模型。方法:将30只新生7天的昆明小鼠随机分为模型组和假手术组,模型组采用结扎一侧颈总动脉并缺氧来制作脑瘫模型。假手术组仅切...目的:制作新生小鼠脑瘫模型,并通过行为学、形态学检测模型的稳定性,为脑瘫的基础研究提供较为理想的动物模型。方法:将30只新生7天的昆明小鼠随机分为模型组和假手术组,模型组采用结扎一侧颈总动脉并缺氧来制作脑瘫模型。假手术组仅切开颈部皮肤,分离出单侧颈总动脉,不结扎,不剪断,然后缝合伤口,未置于缺氧环境。各组小鼠于模型完成后第28天,通过跳台实验观察行为变化、尼氏染色和神经元特异核抗原(Neuron specific nuclear protein,NeuN)的免疫组化染色结果。结果:被动回避性跳台实验中,模型组小鼠较假手术组小鼠学习记忆时间明显延长(P<0.05);尼氏染色结果显示,损伤侧海马各区细胞排列紊乱,尼氏小体数量减少,且CA3区神经元损伤情况最为严重;NeuN免疫组化染色显示模型组小鼠损伤侧海马阳性表达较假手术组同侧明显降低(P<0.05)。结论:应用一侧颈总动脉结扎联合缺氧的方法制作脑瘫模型稳定、可靠。展开更多
基金supported by grants from the Self-innovation Programs of Shandong University, No.1000069961016the National Natural Science Foundation of China, No. 81171231
文摘Enhanced neurogenesis in the dentate gyrus of the hippocampus following seizure activity, especially status epilepticus, is associated with ectopic residence and aberrant integration of newborn granule cells. Hilar ectopic granule cells may be detrimental to the stability of dentate circuitry by means of their electrophysiological properties and synaptic connectivity. We hypothesized that status epilepticus also increases ectopic granule cells in the molecular layer. Status epilepticus was induced in male Sprague-Dawley rats by intraperitoneal injection of pilocarpine. Immunostaining showed that many doublecortin-positive cells were present in the molecular layer and the hilus 7 days after the induction of status epilepticus. At least 10 weeks after status epilepticus, the estimated number of cells positive for both prospero homeobox protein 1 and neuron-specific nuclear protein in the hilus was significantly increased. A similar trend was also found in the molecular layer. These findings indicate that status epilepticus can increase the numbers of mature and ectopic newborn granule cells in the molecular layer.
文摘We investigated the effects of ethanol extracted Scutellaria baicalensis（EESB） on spatial memory function and neurogenesis in the hippocampal dentate gyrus.Adult Sprague-Dawley rats were orally administered 50,100,or 200 mg/kg of EESB for 6 successive days.The radial-arm maze test showed that 200 mg/kg of EESB improved the spatial memory of adult rats.Confocal microscopy results showed that 100 mg/kg of EESB increased the number of bromodeoxyuridine（BrdU）-and neuron-specific nuclear protein-positive cells in the granular cell layer,and that 100 and 200 mg/kg of EESB increased the number of BrdU-/neuron-specific nuclear protein-positive cells in the sub-granular zone.200 mg/kg of EESB increased the number of BrdU-/glial fibrillary acid protein-positive cells in the subgranular zone.These findings indicate that EESB can effectively promote neurogenesis in the hippocampal dentate gyrus and improve spatial memory function.
文摘目的:制作新生小鼠脑瘫模型,并通过行为学、形态学检测模型的稳定性,为脑瘫的基础研究提供较为理想的动物模型。方法:将30只新生7天的昆明小鼠随机分为模型组和假手术组,模型组采用结扎一侧颈总动脉并缺氧来制作脑瘫模型。假手术组仅切开颈部皮肤,分离出单侧颈总动脉,不结扎,不剪断,然后缝合伤口,未置于缺氧环境。各组小鼠于模型完成后第28天,通过跳台实验观察行为变化、尼氏染色和神经元特异核抗原(Neuron specific nuclear protein,NeuN)的免疫组化染色结果。结果:被动回避性跳台实验中,模型组小鼠较假手术组小鼠学习记忆时间明显延长(P<0.05);尼氏染色结果显示,损伤侧海马各区细胞排列紊乱,尼氏小体数量减少,且CA3区神经元损伤情况最为严重;NeuN免疫组化染色显示模型组小鼠损伤侧海马阳性表达较假手术组同侧明显降低(P<0.05)。结论:应用一侧颈总动脉结扎联合缺氧的方法制作脑瘫模型稳定、可靠。
