表达ALS突变SOD1的骨肌管诱导病原性变化,损害线粒体轴突运输,并触发运动神经元死亡
Pablo Martínez1, Mónica Silva2, Sebastián Abarzúa1
1Institute of Biomedical Sciences (ICB), Faculty of Medicine & Faculty of Life Sciences, Universidad Andres Bello, Santiago, Chile.
Molecular medicine (Cambridge, Mass.)
|October 25, 2024
概括
来自突变SOD1小鼠的骨肌细胞释放杀死运动神经元 (MN) 的因素. 这种来自肌肉的毒性在肌缩性侧面硬化症 (ALS) 中会破坏轴突运输并导致细胞死亡.
科学领域:
- 神经科学是一个神经科学.
- 肌肉生物学 肌肉生物学
- 肌缩侧面硬化症 (ALS) 研究研究
背景情况:
- 肌缩侧面硬化症 (ALS) 是一种致命的神经退行性疾病,没有治疗方法,其特点是运动神经元 (MN) 损失.
- 众所周知,表达突变蛋白质的天体细胞会对MNs造成非细胞自主毒性.
- 肌肉在ALS非细胞自主毒性的作用仍然存在争议,尽管早期的神经肌肉结节中断.
研究的目的:
- 调查ALS小鼠骨肌细胞是否有助于MNs的非细胞自主毒性.
- 来自ALS小鼠的骨肌管中的表型差异的特征.
- 确定ALS肌肉细胞释放的因素是否可以诱导MN死亡和轴突功能障碍.
主要方法:
- 来自ALS小鼠 (mutSOD1) 和对照 littermates (NTg) 的初级骨肌管的生成.
- 分析mutSOD1神经管中的表型和功能差异.
- 在混合培养和微流体装置中使用来自mutSOD1肌管 (mutSOD1-MCM) 的条件介质处理初级MN.
- 评估MN存活率,线粒体轴突运输,过渡物和活性氧物种 (ROS).
主要成果:
- 突变SOD1 (mutSOD1) 骨神经管与对照 (NTg) 神经管相比表现出不同的特征.
- 来自mutSOD1神经管 (mutSOD1-MCM) 的条件介质诱导了初级MNs的显著死亡.
- 暴露于MN轴突的mutSOD1-MCM损害了线粒体轴突运输,增加了细胞内 (Ca2+) 和高反应性氧物种 (ROS) 水平.
结论:
- 表达ALS相关突变SOD1的骨肌细胞可以对运动神经元产生非细胞自主毒性.
- 这些肌肉细胞释放的可溶性因子有助于MN轴心病.
- 这种来自肌肉的毒性涉及到线粒体运输的破坏和氧化应激增加,导致ALS中的摩托神经元退化.
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