特定背景的压力导致分隔的SARM1激活和皮层神经元的局部退行
Flora I Hinz1, Carmela Louise M Villegas1, Jasmine T Roberts1
1Department of Neuroscience, Genentech, Inc., South San Francisco, California 94080.
概括
含有1 (SARM1) 激活的无菌α和TIR动机在受伤后的神经元中是分区特异的. SARM1触发了轴突退化,但它的激活部位取决于细胞压力源的类型.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 含有1 (SARM1) 的无菌α和TIR动机是神经元中可诱导的NADase,在受伤后感知代谢变化.
- 在广泛的神经元蛋白质稳态中SARM1的作用很小,但在受伤和压力后的激活模式尚未完全理解.
研究的目的:
- 研究神经元内SARM1在各种损伤和压力条件下对神经元的空间激活.
- 为了确定SARM1激活是否分布在全球或是特定于区块.
主要方法:
- 利用半自动成像管道和深度学习算法来分析神经元退化.
- 在不同的压力下研究了小鼠初级皮质神经元和人类诱导的多能干细胞衍生的皮质神经元.
- 检查了SARM1的激活,以应对机械切割,vacor治疗,微管功能障碍和线粒体应激.
主要成果:
- 根据压力因素,SARM1的激活差异性地局限于特定的神经元区.
- 机械切割导致SARM1依赖的轴突退化,其激活局部于远端.
- 瓦克尔治疗导致全球SARM1激活和细胞体和轴突的退化.
- 微管或线粒体应激会诱导轴突SARM1激活,导致轴突退化,但不是细胞体死亡.
结论:
- 通过SARM1传递神经元死亡信号是分区特异的,并且取决于受伤或压力因素的性质.
- SARM1的激活在整个神经元中并不均,而是根据环境精确地局部化.
- 这些发现阐明了SARM1在神经元退化途径中的上下文依赖作用.
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