β-淀粉样蛋白影响维甲类X受体α到细胞质的穿梭  被引量:1

Beta-amyloid affects retinoid receptor-α exporting into cytoplasm

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作  者:游晓青[1] 陈耀民 黄秀梅 刘迎春[1] 林建银[2] 

机构地区:[1]福建医科大学基础医学院细胞生物学与遗传学系,福州350004 [2]福建医科大学基础医学院病原生物学系,福州350004 [3]美国加州Burnham医学研究院

出  处:《中华神经科杂志》2011年第10期706-710,共5页Chinese Journal of Neurology

基  金:福建医科大学博士科研启动基金资助项目(2010BS009);福建省教育厅科技面上资助项目(JA09122),志谢 本课题受到美国Burnham医学研究院、本文作者的博士生导师许华曦教授和张晓坤教授及其所在实验室同仁的鼎力支持与帮助,在此表示衷心感谢

摘  要:目的 探讨β-淀粉样蛋白(Aβ)对维甲类X受体α(RXRα)生成及到细胞质迁移的影响。方法 将野生型小鼠脑神经瘤细胞(N2awt)分为对照组和实验组,采用Aβ短肽及淀粉样肽前体蛋白(APP)695过表达处理实验组,应用核质分离结合Western blot方法,检测RXRα在细胞核和细胞质中的含量;分别对上述2组N2awt细胞及阿尔茨海默病(AD)患者及健康对照者的脑组织切片进行免疫荧光定位染色,观察RXRα在细胞核与细胞质中分布的改变。结果 在N2awt细胞中,APP或Aβ增多不影响RXRα的表达但导致RXRα在细胞质中含量与分布增多,分别从对照组的3.2%增加至APP处理组的17.6%及从对照组的3.8%增加至Aβ处理组的14.3%;与健康人比较,AD患者脑皮质细胞中RXRα在细胞质分布增加。结论 Aβ可能影响RXRα到细胞质的穿梭。Objective To investigate the effect of Alzheimer' s beta-amyloid (Aβ) on the production and the translocation in cytoplasm of retinoid receptor-α (RXRα). Methods N2awt cells were treated with Aβ peptide or amyloid protein precursor(APP695) transfection. The nucleus were separated from the cytoplasm by kit. The quantity of RXRα in the nucleus and cytoplasm was detected by Westernblot. The translocation of RXRα in the nucleus and cytoplasm of above N2awt cells or of the cortex cells in the brains of Alzheimer' s disease (AD) patients and their normal control groups was observed by immune fluorescence. Results In N2awt cells, the increasing APP or Aβ had no significant effect on the production of RXRα but resulted in RXRα exporting into cytoplasm, the ratio of RXRα in cytoplasm increased from 3.2% (in control group) to 17.6% (in APP+ group) and from 3.8% (in control group) to 14.3% (in Aβ + group) respectively; compared with normal cortex cells, the translocation of RXRα in the cytoplasm of the cortex cells in the brains of AD increased significantly. Conclusion Aβ may affect RXRα exporting into cytoplasm.

关 键 词:阿尔茨海默病 淀粉样Β蛋白 维甲类X受体α 细胞质 

分 类 号:R749.16[医药卫生—神经病学与精神病学]

 

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