Activation of the Notch Signaling Pathway and Cellular Localization of Notch Signaling Molecules in the Spinal Cord of SOD1-G93A ALS Model Mice

Activation of the Notch Signaling Pathway and Cellular Localization of Notch Signaling Molecules in the Spinal Cord of SOD1-G93A ALS Model Mice
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SOD1-G93A ALS 模型小鼠脊髓中 Notch 信号通路的激活和 Notch 信号分子的细胞定位

DOI:
10.1016/j.neuroscience.2020.02.034
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发表时间:
2020-02
期刊:
影响因子:
3.3
通讯作者:
Yansu Guo
Yansu Guo
中科院分区:
医学3区
文献类型:
--
作者:
Chong Liu;Dongxiao Li;Cui Lv;Zhisong Gao;Yinkuang Qi;Hongran Wu;Yunyun Tian;Yansu Guo

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肌萎缩侧索硬化症 (ALS) 是一种致命的神经退行性疾病,其特征是脊髓、脑干和皮质中的运动神经元丢失和神经胶质增生。据报道,Notch 信号通路在神经退行性疾病(包括 ALS)中出现功能障碍。然而,确切的机制仍不清楚。在这里,我们检测到增殖神经胶质细胞中的Notch信号激活、SOD1-G93A模型脊髓运动神经元中的Notch失活以及Notch通路信号分子的细胞重定位的显着变化,包括激活的Notch胞内结构域(NICD)、Notch配体(Jagged1和DLL4)和靶基因Hes1。我们发现Notch激活在增殖的星形胶质细胞中普遍存在,并且Notch配体Jagged1在增殖的小胶质细胞中独特地上调,而DLL4的表达在活化的星形胶质细胞和退化的少突胶质细胞中均增加。我们的结果表明,小胶质细胞可能在 Notch 信号通路的细胞间受体-配体相互作用中发挥重要作用,并有助于 ALS 小鼠运动神经元丢失的发病机制。需要进一步的实验来阐明 ALS 中 Notch 功能障碍的确切机制。
Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disorder characterized by motor neuron loss and gliosis in the spinal cord, brain stem and cortex. The Notch signaling pathway has been reported to be dysfunctional in neurodegenerative diseases, including ALS. However, the exact mechanism is still unclear. Here, we detected Notch signaling activation in proliferating glial cells, Notch inactivation in motor neurons in the spinal cord of the SOD1-G93A model, and dramatic changes of cellular relocalization of Notch pathway signaling molecules, including activated Notch intracellular domain (NICD), Notch ligands (Jagged1 and DLL4) and the target gene Hes1. We found that Notch activation was universal in proliferating astrocytes and that the Notch ligand Jagged1 was uniquely upregulated in proliferating microglia, while DLL4 expression was increased in both activated astrocytes and degenerating oligodendrocytes. Our results indicate that microglia may play an important role in the intercellular receptor-ligand interaction of the Notch signaling pathway and contribute to the pathogenesis of motor neuron loss in ALS mice. Further experiments are required to clarify the exact mechanism responsible for Notch dysfunction in ALS.
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