MiR-34a通过抑制自噬溶酶体通路抑制Aβ42的降解
首发时间:2016-05-20
摘要:阿兹海默病(AD)中Aβ被小胶质细胞吞噬,并通过自噬途径降解。有研究报道m在双突变转基因AD模型小鼠脑组织芯片结果中,miR-34a表达上调。为了探究miR-34a在AD的发生发展中扮演的角色,研究miR-34a对自噬的影响,选取人类神经胶质瘤细胞U251为细胞模型,借助流式细胞仪检测miR-34a对Aβ42降解的影响,通过Westernblot检测自噬标记蛋白LC3和P62的水平,并在荧光共聚焦显微镜观察细胞自噬的变化。利用生物信息学软件预测miR-34a的作用靶点,并通过Q-PCR、Westernblot和构建双荧光报告载体的实验方法进行验证。结果证实miR-34a降低了溶酶体酶Cathepsin B、Cathepsin D的表达,抑制了细胞自噬溶酶体途径,从而抑制了Aβ42的降解。
关键词: 细胞生物学 AD 细胞自噬 miR-34a Aβ42 溶酶体酶
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MiR-34a Reduces Degradation of Aβ42 by Suppressing Autolysosome Pathway
Abstract:Aβ is degraded through autophagy by microglia in Alzheimer's Disease. Research shows that expression of miR-34a is up-regulated in microarray results of a double transgenic mouse model of AD. To explore the role of miR-34a in the development and progression of AD, and the effects on autophagy, we conducted experiments on human glioma cell U251. We detected the effect of miR-34a on degradation of Aβ42 with FACS as well as the markers of autophagy, such as LC3 and P62, followed by observing the change of autophagy under confocal microscopy. Then we predicted the target of miR-34a with the help of the bioinformatics software, which is following veryfied by Q-PCR, Westernblot and Dual-Luciferase Reporter Assay System. Results showed miR-34a suppressed autolysosome pathway by inhibiting lysosome enzymes Cathepsin B and Cathepsin D, which reduced degradation of Aβ42.
Keywords: cell biology AD autophagy miR-34a Aβ42 lysosomal enzymes
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