Zhang Rui, Zhang Qingfu, Niu Jingya, Lu Kang, Xie Bing, Cui Dongsheng, Xu Shunjiang
Central Laboratory, The First Hospital of Hebei Medical University, Shijiazhuang, China.
Department of Burns and Plastic Surgery, The First Hospital of Hebei Medical University, Shijiazhuang, China.
J Neurol Sci. 2014 Mar 15;338(1-2):57-64. doi: 10.1016/j.jns.2013.12.017. Epub 2013 Dec 15.
Oxidative stress plays a critical role in the etiology and pathogenesis of Alzheimer's disease (AD), and the molecular mechanisms that control the neuron response to oxidative stress have been extensively studied. However, the effects of oxidative stress on miRNA expression in hippocampal neurons has not been investigated, and little is known about the roles of ROS-modulated miRNAs in cell function as yet. In this study, miRNA microarray technology was used to analyze the expression of miRNAs in the oxidative stressed primary hippocampal neurons, hippocampus of senescence accelerated mouse prone 8 (SAMP8) and prone 10 (SAMP10). The targets of co-regulated microRNAs were also selected for computational prediction using miRWalk software and functional analysis by the DAVID software. In addition, the changes of co-regulated microRNA expression were validated by quantitative real-time PCR. The results of microarray analysis showed that miR-329, miR-193b, miR-20a, miR-296, and miR-130b were all upregulated in H2O2-induced primary hippocampal neurons and different strains of senescence accelerated mice. The Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis showed that these co-regulated microRNAs may be involved in the regulation of cell growth, apoptosis, signal transmission and cancer development. In which, mitogen-activated protein kinase (MAPK) signaling pathway was one of the most significant pathways to be affected by 83 target genes of miR-329, miR-193b, miR-20a miR-296, and miR-130b. The quantitative real-time PCR data confirmed the alterations of the co-upregulated miRNAs. These results suggested that oxidative stress alters the miRNA expression profile of hippocampal neurons, and the deregulated miRNAs might play potential roles in the pathogenesis of neurodegenerative diseases, such as Alzheimer's disease (AD). This study provided a strong basis for the future study aiming at contributions of miRNAs induced by oxidative stress in AD.
氧化应激在阿尔茨海默病(AD)的病因学和发病机制中起着关键作用,并且控制神经元对氧化应激反应的分子机制已得到广泛研究。然而,氧化应激对海马神经元中微小RNA(miRNA)表达的影响尚未得到研究,目前对于活性氧(ROS)调节的miRNA在细胞功能中的作用也知之甚少。在本研究中,运用miRNA微阵列技术分析了氧化应激的原代海马神经元、快速老化小鼠8型(SAMP8)和10型(SAMP10)海马中miRNA的表达情况。还使用miRWalk软件对共同调控的微小RNA的靶标进行了计算预测,并通过DAVID软件进行功能分析。此外,通过定量实时PCR验证了共同调控的微小RNA表达的变化。微阵列分析结果显示,miR-329、miR-193b、miR-20a、miR-296和miR-130b在H2O2诱导的原代海马神经元以及不同品系的快速老化小鼠中均上调。京都基因与基因组百科全书(KEGG)通路分析表明,这些共同调控的微小RNA可能参与细胞生长、凋亡、信号传导和癌症发展的调控。其中,丝裂原活化蛋白激酶(MAPK)信号通路是受miR-329、miR-193b、miR-20a、miR-296和miR-130b的83个靶基因影响最显著的通路之一。定量实时PCR数据证实了共同上调的微小RNA的变化。这些结果表明,氧化应激改变了海马神经元的miRNA表达谱,失调的miRNA可能在神经退行性疾病如阿尔茨海默病(AD)的发病机制中发挥潜在作用。本研究为未来旨在研究氧化应激诱导的miRNA在AD中的作用的研究提供了有力依据。