在神经元衰老过程中,RNA会引发慢性压力
Kevin Rhine1,2,3, Elle Epstein1,2,3, Natasha M Carlson4,5
1Department of Cellular & Molecular Medicine, University of California, San Diego, La Jolla, CA 92037, USA.
bioRxiv : the preprint server for biology
|August 13, 2025
概括
线粒体衍生双链RNA (dsRNA) 激活老年神经元的综合应激反应 (ISR),从而导致神经退行. 抑制PKR激酶可以恢复细胞功能和翻译.
科学领域:
- 神经生物学 神经生物学 神经生物学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 神经退行性疾病与综合应激反应 (ISR) 的破坏有关.
- 导致衰老和神经退行的特定细胞压力因素仍在争论中.
- 在压力下,ISR对于维持细胞平衡至关重要.
研究的目的:
- 确定老年神经元中综合应激反应 (ISR) 激活的来源.
- 研究细胞质双链RNA (dsRNA) 在ISR激活中的作用.
- 探索PKR激酶作为老年神经元中ISR的媒介.
主要方法:
- 人体纤维细胞向老年神经元的定向转差.
- 对细胞质dSRNA积累及其与PKR的相互作用的分析.
- 评估线粒体完整性和dsRNA泄漏情况.
- 评估PKR抑制对细胞应激和翻译的影响.
主要成果:
- 细胞质dRNA积累的增加会激活PKR,从而触发老年神经元中的ISR.
- 线粒体衍生的dsRNA在老年神经元中积累,与PKR结合,并泄露到细胞质中.
- PKR的激活导致dSRNA在压力颗粒中的分离.
- 抑制PKR可以减少细胞应激,恢复翻译,并使RNA结合蛋白表达正常化.
结论:
- 内源性线粒体dRNA是老年神经元中RNA压力的关键来源.
- 由PKR和线粒体dRNA调节的失调的ISR,有助于神经元的破坏稳定和神经退行.
- 准PKR可能为神经退行性疾病提供治疗策略.
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