听源性惊厥点燃诱导海马结构神经细胞死亡

目的　检测听源性惊厥单次发作及惊厥点燃发作后 ,易感大鼠海马结构内是否出现神经细胞死亡现象 ,并对细胞死亡的相关机制进行初步分析。　方法　建立听源性惊厥点燃模型 ,以HE染色和免疫细胞化学染色方法 ,检测单次发作大鼠和点燃发作大鼠海马结构内死亡细胞的分布 ,以及凋亡相关蛋白Bcl 2和Bax的表达情况。　结果　听源性惊厥单次发作后 ,海马内未见明显细胞死亡现象 ;点燃后 ,海马CA1 、CA2 、CA4 区锥体细胞层及齿状回颗粒细胞层出现大量核固缩、胞浆嗜酸性变的死亡神经元 ;点燃组海马CA2 区及CA4 区内Bax免疫阳性产物校正光密度 (CA)值较对照组显著增高。　结论　听源性惊厥点燃可诱导海马结构大量神经元死亡 ,凋亡可能是细胞死亡的形式之一

CELL DEATH IN HIPPOCAMPUS FORMATION INDUCED BY AUDIOGENIC KINDLING

Objective To investigate if the cell death in hippocampus can occur after single and kindled audiogenic seizure,and the pertinent mechanisms involved. Methods HE staining was used to show the distribution of the dead cells and the immunocytochemistry was used to show the expression of the apoptosis\|related proteins Bcl\|2 and Bax. Results After single audiogenic seizure,there were a few dead cells in hippocampus.After kindled seizure a lots of pyknotic,acidophilic cells were found in hippocampal CA\-1,CA\-2,CA\-4 subregions and the granular layer of dentate gyrus.The CA (corrected optic density) values of Bax immunoreactivities in CA\-2 and CA\-4 subregions were increased significantly in kindled rats, in contrast with that in control rats.Conclusions\ Audiogenic kindling can induce marked cell death in hippocampus.Apoptosis may be one of the mechanisms underling this kind of cell death.