与年龄相关的多巴胺神经元退化的自然变化依赖于谷氨,并与寿命相关
Colin R Coleman1, Judit Pallos1, Alicia Arreola-Bustos1
1Jungers Center for Neurosciences, Department of Neurology, Oregon Health and Science University, Portland, OR 97239.
概括
衰老和短寿命有助于多巴胺神经元在帕金森病 (PD) 中的损失. 低谷水平会加剧这种情况,而增加谷会保护神经元并延长果的寿命.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
- 衰老研究研究 衰老研究
背景情况:
- 衰老是帕金森病 (PD) 的主要危险因素,增加多巴胺神经元的脆弱性.
- 老龄化对多巴胺神经元损失的直接影响及其与PD神经退行症的相互作用仍然不清楚.
研究的目的:
- 为了研究寿命,衰老和多巴胺神经元丧失在 * Drosophila * * 中的关系.
- 探索分子机制,特别是谷氨水平和氧化应激,将寿命与神经退行联系起来.
- 评估谷氨酸在PD病原体中的保留作用,包括Drosophila和人类系统.
主要方法:
- 检查了自然变化的 * Drosophila * 菌株,以将寿命与与年龄相关的多巴胺神经元损失相关联.
- 进行了代谢分析,以确定生化途径的差异.
- 利用基因操纵 (谷氨酸-氨酸酶过度表达) 来测试谷氨的功能作用.
主要成果:
- 短命的 *Drosophila* 菌株表现出多巴胺神经元的损失,而没有普遍的神经退行,与长寿菌株不同.
- 短寿命菌株中较低的谷氨水平与增加的活性氧物种 (ROS) 和氧化应激敏感性相关.
- 过度表达谷氨酸-氨酸酶 (Gcl) 正常化了ROS,延长了寿命,并在短命菌株中预防了多巴胺神经元损失.
- 在脆弱的 *Drosophila* 和人类家族性PD大脑 (LRRK2 G2019S突变) 中观察到减少的Gcl亚单元表达.
结论:
- 谷氨缺乏是与短寿命和多巴胺神经元损失相关的神经退行现象的核心.
- 谷氨酸的合成和水平在维持与年龄相关的多巴胺神经元健康方面起着保留作用,无论是 *Drosophila* 和人类PD.
- 研究结果表明,通过调节谷氨水平,可以作为PD的潜在治疗标.
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