目的 探讨雌激素通过雌激素受体 (estrogen receptor ER )调节细胞凋亡的可能机制。方法 利用荧光免疫组织化学的方法,研究了 10例阿尔茨海默病 Alzheim er's disease AD 患者和 10例对照受试者海马中 Bcl-2的分布及 Bcl-2和 ER α的共存现象。结果 Bcl-2主要在 AD 患者和对照受试者海马 CA 3和 CA 4亚区的锥体层神经元中广泛表达,且多分布于胞质和突起,胞核较少。星型胶质细胞中也可检测到 Bcl-2免疫活性,AD 组中大量表达,而对照组中很少表达。免疫组织化学荧光双标显示,大部分被 Bcl-2免疫标记的神经元也表达 ER α。结论 在 AD 患者海马的神经元和星型胶质细胞中,雌激素可能作为细胞凋亡的一个调节子,通过 ER α来调节 Bcl-2表达,行使其神经保护作用。
To study the effects of oestrogcn on ischemia-induced neurogenesis in the hippocampal dentate gyms, thirty-two adult male rats were randomly divided into four groups： the control surgery group with eestrogen administration （SE）, the control surgery group with normal saline administration （SN）, the middle cerebral artery occlusion （MCAO） group with oestrogen administration （ME） and the MCAO group with normal saline administration （MN）. The MCAO rats were occluded for 90 rain by an intraluminal filament and then recirculated. After 1, 3, 12, 24 and 28 h of MCAO, the rats of the four groups were killed to investigate the infarct volume, apoptosis and neurogenesis. The cerebral infarct volume in the ME group was significantly smaller than that of the MN group （P 〈 0.05）. No significant cell loss was seen in the dentate gyms. Cerebral ischemia led to increased neurogenosis, which is independent of cell death in the ipsilateral dentate gyrus（P 〈 0.05）. BrdU-pesitive cells in the ipsilateral dentate gyms of the ME group were significantly increased when compared with those of the MN group（P 〈 0.05）. In the SE group, BrdU-positive cells in both the ipsilateral and contralateral dentate gyms, were increased when compared with those of the SN group （ P 〈 0.05 ）. We concluded that ocstregen plays an important role in neurogenesis, which is independent of ischemia-induced by MCAO in the hippocampal dentate gyms of rats.
