氏病的葡萄糖大脑化酶和α-synuclein在synucleinopathies中形成一个双向的致病循环
Joseph R Mazzulli1, You-Hai Xu, Ying Sun
1Department of Neurology, Massachusetts General Hospital, Harvard Medical School, MassGeneral Institute for Neurodegenerative Disease, Charlestown, MA 02129, USA.
Cell
|June 25, 2011
概括
帕金森病通过葡萄糖大脑酶 (GCase) 与戈舍病有关. 失去GCase功能会损害蛋白质分解,导致α-synuclein积累和神经毒性,这表明一种共同的疾病机制.
科学领域:
- 神经退行性疾病的神经退行性疾病
- 溶酶体储存障碍 溶酶体储存障碍
- 神经毒性的分子机制
背景情况:
- 帕金森病 (PD) 是一种成人神经退行性疾病.
- 在PD和高氏病 (GD) 之间存在临床联系,GD是一种溶酶体储存障碍.
- 尽管如此,PD和GD之间的机械联系仍然是未知的.
研究的目的:
- 调查与高氏病相关的葡萄糖大脑糖酶 (GCase) 与帕金森病的发病机制之间的机制联系.
- 阐明GCase功能障碍在α-synuclein (α-syn) 聚合和神经毒性的作用.
主要方法:
- 利用了初级神经元培养物和人类诱导的多能干细胞 (iPS) 衍生的神经元.
- 评估了溶酶体蛋白质降解途径.
- 研究了葡萄糖胺 (GlcCer) 对α-syn粉样蛋白形成的影响.
- 检查了GCase活性在异形性PD脑组织中.
主要成果:
- GCase的功能性损失影响了溶解体蛋白质降解.
- GCase缺乏导致α-syn积累和聚合依赖的神经毒性.
- GCase基质GlcCer稳定了α-syn寡合中间体,促进了粉样蛋白的形成.
- 发现α-syn可以抑制神经元和PD脑组织中的正常GCase活性.
结论:
- 在α-syn和GCase之间存在双向反循环,可能驱动疾病的自我传播.
- GCase 枯竭有助于散发性同核蛋白病变的发病.
- 向GCase向溶解体的传递可能为PD和其他同核蛋白病变提供一种特定的治疗策略.
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