失调的乳酸代谢与ALS遗传风险因素协同作用,加速运动衰退
Shweta Tendulkar1, Tong Wu2, Amy Strickland2
1Department of Developmental Biology, Washington University School of Medicine, St. Louis, 63110, United States.
bioRxiv : the preprint server for biology
|December 15, 2025
概括
降低乳酸脱酶B (LDHB) 功能会损害神经肌肉连接和运动行为. 这种LDHB缺乏与ALS遗传风险因素相互作用,突显了乳酸代谢在神经退行症中的作用.
科学领域:
- 神经科学是一个神经科学.
- 代谢途径 代谢途径
- 神经退行性疾病研究
背景情况:
- 神经元依赖质细胞通过乳酸运输来提供代谢支持,这一过程随着衰老和神经退行而下降.
- 与衰老和疾病相关的乳酸转移的部分中断有助于神经退行风险.
- 乳酸脱酶 (LDHA和LDHB) 相互转化酸盐和乳酸盐,这对细胞代谢至关重要.
研究的目的:
- 为了研究部分乳酸转运中断对神经退行症的影响.
- 探索乳酸脱酶B (LDHB) 在运动系统脆弱性中的作用.
- 确定LDHB缺乏是否会加剧肌缩侧面硬化症 (ALS) 的遗传风险.
主要方法:
- 利用Ldhb淘汰和异合体小鼠研究运动功能和神经肌肉结合.
- 在 Schwann 细胞 (SC) 和运动神经元中研究了细胞类型特定的 LDHB 缺失.
- 研究了LDHB缺乏和ALS遗传风险变体 (TDP43 Q331K,Sod1 D83G) 之间的相互作用.
- 在ALS患者中选罕见的功能丧失LDHB变体.
主要成果:
- Ldhb淘汰赛小鼠表现出渐进的神经肌肉结节缩和功能衰退,而没有轴突退化.
- 在 Schwann 细胞中选择性删除 LDHB,但不是运动神经元,导致显著的运动缺陷.
- LDHB缺乏与ALS风险变体协同作用,加速运动神经病变.
- 异构性Ldhb缺乏 (Ldhb+/-) 显著影响了运动行为.
结论:
- 乳酸脱酶B (LDHB) 对于维持神经肌肉结合完整性和运动功能至关重要.
- 斯万细胞中的LDHB缺乏,而不是运动神经元,驱动运动衰退.
- 乳酸代谢是运动系统脆弱性的关键修饰因素.
- 针对乳酸代谢是神经退行性疾病的潜在治疗策略.
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