在微质细胞表面上,TREM2与经过6O硫化和依杜龙酸修饰的肝硫酸结合并形成功能双复合体
Ilayda Ozsan McMillan1, Li Liang2, Guowei Su3
1Department of Molecular Pharmacology and Physiology, University of South Florida Morsani College of Medicine, Tampa, Florida, USA.
The Journal of biological chemistry
|August 19, 2024
概括
在骨髓细胞-2 (TREM2) 上表达的触发受体将肝硫酸盐 (HS) 结合到微质上. 这种对ApoE吸收至关重要的相互作用,对于阿尔茨海默病中的微质功能至关重要.
科学领域:
- 神经免疫学 神经免疫学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 在骨髓细胞-2 (TREM2) 上表达的触发受体对微质功能至关重要,包括神经保护.
- TREM2变种R47H和R62H与阿尔茨海默病有关,但机制尚不清楚.
- 之前的研究表明TREM2与肝素硫酸盐 (HS) 结合,其中变体的亲和力降低.
研究的目的:
- 研究TREM2和HS在微质细胞表面上的相互作用.
- 为了确定这种相互作用对微质功能的影响,特别是ApoE吸收.
- 阐明TREM2-HS结合的结构要求.
主要方法:
- 表面等离子体共振是什么?
- 低分子量HS微阵列选低分子量HS微阵列选
- 系列HS突变细胞表面结合试验.
- 分析HS-TREM2复合物的生物化学技术.
主要成果:
- TREM2与细胞表面HS结合,在微质上形成二元复合体.
- 最佳结合需要至少10个糖单位的HS和特定的6-O-硫化.
- HS和6-O-硫化对于微质中介的TREM2-介导的ApoE3吸收至关重要.
- 6-O-硫化对于HS-TREM2三元复合物的形成至关重要.
结论:
- TREM2选择性地结合特定的HS结构,其中6-O-硫化是关键.
- 微质上的HS-TREM2相互作用对ApoE吸收至关重要.
- 了解这种相互作用为阿尔茨海默病提供了潜在的治疗点.
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