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Aberrant neuronal expression of mitotic protein, tau and Bax in the rat brain after injection of Aβ 25-35 into the amygdala
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- Author:
- No author available
- Journal Title:
- ACTA PHYSIOLOGICA SINICA
- Issue:
- 2
- DOI:
- 10.3321/j.issn:0371-0874.2003.02.005
- Key Word:
- 脑;β-淀粉样蛋白;cyclin A;cyclin B1;tau蛋白;阿尔茨海默病
Abstract： 近年来研究发现, 阿尔茨海默病(Alzheimer′s disease, AD)病人脑内神经元细胞周期相关蛋白的异常表达与AD相关病理改变存在关联.为探讨β-淀粉样蛋白(β-amyloid, Aβ)的毒性作用能否导致成年脑神经元表达细胞周期相关蛋白, 以及细胞周期相关蛋白表达与神经损伤之间的关系, 我们运用免疫组化、积分光密度分析等方法对Aβ 25-35多肽片段单侧杏仁核注射的大鼠脑进行了研究.结果显示, Aβ 25-35注射的大鼠脑内除了有与神经纤维缠结相关的磷酸化tau 蛋白和凋亡相关蛋白Bax蛋白水平增加外, 术后7 d细胞周期相关蛋白cyclin A和cyclin B1蛋白在神经元内异常表达, 但术后21 d时cyclin A的表达有所降低, 而cyclin B1在脑内神经元中已检测不到; 免疫荧光双标结果显示Aβ 25-35注射后7 d的大鼠脑内有较多的cyclin B1和Bax、 cyclin B1和磷酸化tau蛋白共存的神经元, 而Bax与磷酸化tau蛋白阳性信号很少共存在同一细胞上.以上结果提示, Aβ可导致成年脑神经元表达细胞周期相关蛋白, 这些神经元可能会通过与Bax相关的凋亡途径死亡, 或首先导致与AD神经纤维缠结相关的tau蛋白磷酸化.
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