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在帕金森病模型中,BCKDK损失会损害线粒体复合体I活动,并驱动α-synuclein聚合

Aya Jishi¹, Di Hu^1,2, Yutong Shang¹

¹Department of Physiology & Biophysics, Case Western Reserve University School of Medicine, Cleveland, OH, 44106, USA.

Acta neuropathologica communications

|December 21, 2024

概括

分支链酸脱酶激酶 (BCKDK) 的丧失会损害线粒体功能,并在帕金森病 (PD) 中恶化α-synuclein (αSyn) 聚合. 恢复BCKDK可能通过改善线粒体健康来为PD提供治疗策略.

科学领域:

神经科学是一个神经科学.
线粒体生物学线粒体生物学
神经退行性疾病神经退行性疾病

背景情况:

线粒体功能障碍和α-synuclein (αSyn) 聚合是帕金森病 (PD) 发病的核心原因.
将线粒体缺陷与αSyn病理联系在一起的确切机制尚未完全理解,这限制了治疗的发展.

研究的目的:

确定导致PD中αSyn病理的线粒体风险因素.
研究分支链酸脱酶激酶 (BCKDK) 在PD病变发生过程中的作用.

主要方法:

在PD模型中研究了BCKDK下调 (A53T-αSyn小鼠,患者衍生的iPSC,死后脑组织).
评估线粒体功能 (膜潜力,ROS) 和αSyn寡合化,以应对BCKDK缺乏.
研究了BCKDK和复杂I子单元NDUFS1.1之间的相互作用.
在细胞模型中恢复了BCKDK表达,以评估救援效应.

主要成果:

在PD模型和患者的多巴胺能神经元中,BCKDK的下调始终如一.
BCKDK 缺乏导致线粒体功能障碍,并促进αSyn 寡合化.
通过与NDUFS1的相互作用,BCKDK稳定了复合体I;BCKDK的丧失使复合体I不稳定.
恢复BCKDK可以挽救线粒体的完整性,复杂I活性,并减少细胞模型中的αSyn病理.

结论:

BCKDK 缺陷是一种新的线粒体危险因子,在PD中加剧了αSyn病理.
BCKDK-NDUFS1相互作用对于维持复杂I功能和线粒体健康至关重要.
准BCKDK代表了PD的潜在治疗策略,以解决线粒体功能障碍和神经退行.

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