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| 1 | Conditional Deletion of Foxg1 Alleviates Demyelination and Facilitates Remyelination via the Wnt Signaling Pathway in Cuprizone-Induced Demyelinated Mice显示文摘The massive loss of oligodendrocytes caused by various pathological factors is a basic feature of many demyelinating diseases of the central nervous system(CNS). Based on a variety of studies, it is now well established that impairment of oligodendrocyte precursor cells(OPCs) to differentiate and remyelinate axons is a vital event in the failed treatment of demyelinating diseases. Recent evidence suggests that Foxg1 is essential for the proliferation of certain precursors and inhibits premature neurogenesis during brain development. To date, very little attention has been paid to the role of Foxg1 in the proliferation and differentiation of OPCs in demyelinating diseases of the CNS. Here, for the first time, we examined the effects of Foxg1 on demyelination and remyelination in the brain using a cuprizone(CPZ)-induced mouse model. In this work, 7-week-old Foxg1 conditional knockout and wild-type(WT) mice were fed a diet containing 0.2% CPZ w/w for 5 weeks, after which CPZ was withdrawn to enable remyelination. Our results demonstrated that, compared with WT mice, Foxg1-knockout mice exhibited not only alleviated demyelination but also accelerated remyelination of the demyelinated corpus callosum. Furthermore, we found that Foxg1 knockout decreased the proliferation of OPCs and accelerated their differentiation into mature oligodendrocytes both in vivo and in vitro. Wnt signaling plays a critical role in development and in a variety of diseases. GSK-3 b, a key regulatory kinase in the Wnt pathway, regulates the ability of b-catenin to enter nuclei, where it activates the expression of Wnt target genes. We then used SB216763,a selective inhibitor of GSK-3 b activity, to further demonstrate the regulatory mechanism by which Foxg1 affects OPCs in vitro. The results showed that SB216763 clearly inhibited the expression of GSK-3 b, which abolished the effect of the proliferation and differentiation of OPCs caused by the knockdown of Foxg1. These results suggest that Foxg1 is involved in the proliferation and differentiation of OPCs through the Wnt signaling pathway. The present experimental results are some of the first to suggest that Foxg1 is a new therapeutic target for the treatment of demyelinating diseases of the CNS. | Fuxing Dong Dajin Liu Feiyu Jiang Yaping Liu Xiuxiang Wu Xuebin Qu Jing Liu Yan Chen Hongbin Fan Ruiqin Yao | 2021 | Neuroscience Bulletin2021，37，1： | 0 |
| 2 | 两种传代方法影响人胚胎干细胞转染效率的比较显示文摘背景:现有方法将外源分子如DNA导入到人胚胎干细胞用于科学研究的效率普遍较低,如何优化现有条件,提高转染效率显得尤为重要。目的:比较两种不同的传代方法对人胚胎干细胞系H9转染效率的影响,优化胚胎干细胞转染条件。方法:人胚胎干细胞系H9分别采用小克隆传代法和单细胞传代法进行传代,传代后继续培养细胞48 h,用Lipofectamine 3000转染pAdTrack-AKT1荧光质粒2 d后,荧光显微镜下观察荧光质粒的表达,流式细胞仪检测人胚胎干细胞的转染效率;RT-qPCR和Western blot分别检测转染后AKT1在mRNA和蛋白质水平的表达。结果与结论:①荧光显微镜下观察发现单细胞传代组表达荧光质粒的细胞数量更多,流式细胞仪检测单细胞传代法的转染效率[(47.18±2.00)%]高于小克隆传代法的转染效率[(19.52±0.86)%],差异有显著性意义(P<0.01);②单细胞传代组转染后AKT1 mRNA和蛋白的表达均高于小克隆传代组,差异有显著性意义(P<0.01);③结果表明,采用单细胞传代法,增加细胞与转染试剂脂质体的接触面积可提高人胚胎干细胞的转染效率。 | 孙莉 纵艳艳 魏建峰 | 2020 | 中国组织工程研究2020，24，1： | 0 |
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