肌肉胆固醇运输的调节失调在肌缩性侧面硬化症中
Delphine Sapaly1, Flore Cheguillaume1, Laure Weill1
1University Paris Cité and Inserm UMR_S1124, 75270, 75006 Paris, France.
Brain : a journal of neurology
|August 28, 2024
概括
胆固醇在患有肌性侧面硬化症 (ALS) 的患者的骨肌肉中积累,与疾病严重程度相关. 这种与NPC1/2载体相关的失调,发生在症状前,可能为ALS提供治疗点.
科学领域:
- 神经科学是一个神经科学.
- 代谢障碍 代谢障碍 代谢障碍
- 细胞生物学 细胞生物学
背景情况:
- 肌缩侧面硬化症 (ALS) 是一种神经退行性疾病,其特征是运动神经元损失和代谢改变.
- 骨肌肉代谢在ALS中发生变化,增加能量消耗和脂肪氧化.
- 包括胆固醇在内的失脂症在ALS病理生理学中的作用受到争论.
研究的目的:
- 调查ALS运动功能障碍与肌肉胆固醇代谢失调之间的关联.
- 分析ALS患者,基因携带者和对照者的肌肉中的胆固醇含量和关键基因表达.
- 探讨胆固醇低温稳定性对ALS中改变线粒体脂肪酸利用率的贡献.
主要方法:
- 分析了来自13名ALS患者,10名无症状基因携带者和16名对照者的肌肉活检.
- 测量胆固醇含量和胆固醇代谢途径基因 (NPC1,NPC2) 的表达.
- 在人体初级髓管中对NPC1和 lysosomal pH进行实验性操纵,以评估代谢变化.
主要成果:
- 胆固醇在ALS患者的骨肌肉中积累,与疾病严重程度相关 (修订ALS功能评级表).
- 在ALS肌肉中观察到Niemann-Pick类型C1 (NPC1) 和C2 (NPC2) 型 lysosomal胆固醇载体的过度表达.
- 在无症状的ALS突变载体中检测到高NPC2mRNA水平,这表明了症状前的变化.
- 实验中的NPC1抑制诱导了转向脂肪酸利用的转变,模仿ALS肌肉代谢.
结论:
- 肌肉胆固醇平衡在ALS中失调,即使是在症状前阶段.
- NPC1/2胆固醇运输系统的功能障碍有助于ALS肌肉中的代谢缺陷.
- 针对NPC1/2功能障碍为ALS提供了潜在的治疗策略,以改善肌肉能量代谢和减缓疾病进展.
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