在肌性侧面硬化症中对皮层内部神经元电路的直接询问
Mehdi A J van den Bos1,2, Parvathi Menon1,2, Nathan Pavey1,2
1Brain and Nerve Research Centre, Concord Clinical School, The University of Sydney, Sydney, NSW 2139, Australia.
Brain : a journal of neurology
|October 10, 2024
概括
肌缩侧面硬化症 (ALS) 涉及由于GABAergic功能障碍而导致皮质过度兴奋. 新的TMS-EEG方法揭示了ALS患者的局部运动皮质GABAergic电路缺陷,与疾病严重程度相关.
科学领域:
- 神经科学是一个神经科学.
- 神经学 神经学
- 生物医学工程 生物医学工程
背景情况:
- 皮层过度兴奋性是肌缩侧面硬化症 (ALS) 的一个关键特征.
- 这种过度兴奋性被认为涉及到皮层内部神经元内的复杂相互作用.
- 直接测量皮质内部神经元功能一直是一个技术上的挑战.
研究的目的:
- 用一种新的技术方法研究ALS中的GABAergic功能障碍.
- 与对照人群相比,检查ALS患者的运动皮层输出和内部神经元功能.
- 将神经生理学发现与疾病严重程度和持续时间的临床测量相关联.
主要方法:
- 结合跨磁刺激 (TMS) 和先进的脑电图 (EEG) 来记录跨唤起的潜力 (TEP).
- 在21名ALS患者和健康对照中,在主运动皮质上应用单脉冲和抑制对脉冲TMS.
- 分析了特定的TEP组件 (N44,N100,P60,P190) 和它们在响应TMS范式的变化.
主要成果:
- 在单脉冲TEP中,ALS患者的N100降低,P190增加,这表明GABAergic功能障碍.
- 配对脉冲TMS显示ALS患者 (影响P60和N100) 的抑制降低,与GABAA-ergic电路功能障碍一致.
- N44成分与肌肉衰弱相关,而减少的N100抑制与更长的疾病持续时间相关.
结论:
- 新的TMS-EEG技术成功地在ALS患者的运动皮质中确定了局部GABAergic电路功能障碍.
- 这些发现支持这样一个假设,即ALS中皮质过敏性是由皮质消抑制介导的.
- 确定的GABAergic功能障碍具有病理生理学意义,与ALS的临床残疾和疾病进展相关.
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