摘要
目的:观察染料木素(Genistein ,Gen)对Aβ-amyloid peptide fragment 25-35(Aβ25-35)诱导胎鼠海马神经元细胞损伤前后形态学指标的变化.方法:取16～18 d孕龄胎鼠海马组织进行神经元细胞的原代培养,细胞培养72 h后进行实验.Gen浓度为0.32 mg/L,用0.01 μmot/L 17β-雌二醇为阳性对照组,细胞损伤模型采用2 5 mg/L Aβ25-35建立.实验分6组,即Gen组、Gen模型组、雌二醇组、雌二醇模型组、空白组和空白模型组.海马神经元培养完毕,将Gen、17β-雌二醇比AB25-35提前4 h加入培养液,继续孵育24 h后观察海马神经元细胞形态学:活细胞形态、细胞核Hoechst33342和PI双染色以及神经元NSE和Tunel双染色等指标的变化水平.结果:①空白模型组海马神经元细胞树突轴突基本消失,未见网状结构,细胞胞体没有折光性,细胞碎片很多;和空白模型组相比较,Gen模型组细胞可见明显树突轴突,并可连接成网状结构,细胞胞体部分可见折光性,细胞碎片明显减少.Gen模型组和雌二醇模型组细胞形态差异不大.②空白模型组可见大量坏死细胞核(红色),仅有少量正常细胞;和空白模型组相比较,Gen模型组坏死细胞核的数量明显减少,而正常细胞核的数量明显增加.Gen模型组和雌二醇模型组差异不大.③空白模型组可见大量坏死细胞核着色(Tunel黄绿色),而胞体染色(NSE红色)不可见;和空白模型组相比较,Gen模型组坏死细胞核的数量明显减少,而正常细胞的数量明显增加,且胞体可连接呈网状结构.Gen模型组和雌二醇模型组细胞形态差异不大.结论:①Gen模型组较空白模型组能明显改善AB25-35诱导损伤后海马神经元细胞形态学各指标,且和雌二醇模型组比较差异不大;②Gen对Aβ25-35诱导的海马神经元起保护因子或抗凋亡因子的作用,Gen有一定的神经保护作用;③Gen对Aβ25-35诱导海马神经元的神经保护作用机制可能与海马部位存在一定的雌激素受体从而引起雌激素水平变化有关.
Abstract
AIM: To investigate the neuroprotective effect of Genistein on morphological changes in cultured hippocampal neu-rons following β-Amyloid(25-35)-induced apoptosis. METHODS: The model of damage was induced by Aβ25-35 and the changes of cell morphology were observed. Apoptosis in hippocampal neurons induced by Aβ25-35 was detected with hoechst33342 and PI co-staining method. NSE and Tunel double-staining assay were also conducted. RESULTS: Compared with that in Aβ25-35 only group, the morphology damage of hippocampal neurons in Genistein model group was less severe and apoptosis in Genistein model group was obviously lower. CONCLUSION: Genistein, with some neuro-protective or anti-apoptotic effects, plays an important role in up-regulating the hippocampal neuronal survival during the process of Aβ25-35-induced damage.
基金项目
陕西省社会发展攻关计划项目(2005K14-G33)
NETL
NSTL
维普
万方数据