帕金森病风险蛋白TMEM175是溶酶体中的质子激活质子通道
Meiqin Hu1, Ping Li1, Ce Wang2
1Department of Molecular, Cellular, and Developmental Biology, University of Michigan, 4114 Biological Sciences Building (BSB), 1105 N. University Ave, Ann Arbor, MI 48109, USA; Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, College of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, China.
TMEM175 作为溶酶体中的质子通道,调节它们的酸度. 这种蛋白质
科学领域:
- 细胞生物学
- 分子生物学
- 神经科学
背景情况:
- Lysosomes 需要特定的酸性 pH (4.5-5.0) 才能达到最佳功能.
- 通过V-ATPase和未知的H+泄漏途径保持这种pH.
- lysosomal pH 的失调与像帕金森病 (PD) 这样的神经退行性疾病有关.
研究的目的:
- 确定溶解体H+泄漏途径的分子基础.
- 调查TMEM175在溶解体pH调节和PD病变中的作用.
主要方法:
- 作为质子通道的TMEM175的功能特征 (LyPAP).
- 针对pH变化和激动剂的TMEM175活性分析.
- 在体内评估TMEM175缺乏对溶酶体功能和α-synuclein聚合的影响.
主要成果:
- TMEM175 在 lysosomal 膜上作为一个由质子激活的,选择性质子通道.
- 通过酸性或脂肪酸激活TMEM175,引发质子释放,防止过度酸性.
- TMEM175 缺乏导致溶酶体过度酸性,蛋白质分解活性降低和α-synuclein聚合增强.
结论:
- TMEM175是溶酶体H+泄漏的关键媒介,对于维持溶酶体pH稳定至关重要.
- TMEM175的质子通道活性对于正常的溶酶体降解和预防PD相关的病理是必不可少的.
- 通过调节 lysosomal 功能,针对 TMEM175 可能为帕金森病提供治疗策略.
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