在粉胺β诱导的神经炎症中对TREM2的PET成像
Amelia D Dahlén1, Sahar Roshanbin1, Ximena Aguilar1
1Department of Public Health and Caring Sciences, Section of Molecular Geriatrics, Uppsala University, Uppsala, Sweden.
概括
这项研究开发了针对TREM2 (在骨髓细胞2上表达的触发受体) 的双特异性抗体,用于阿尔茨海默病 (AD) 成像. 在AD小鼠模型中,IgG-scFv2格式显示出优异的脑传递和TREM2可视化.
科学领域:
- 神经科学是一个神经科学.
- 免疫学 免疫学 免疫学
- 生物技术是生物技术.
背景情况:
- 在骨髓细胞2 (TREM2) 上表达的触发受体是阿尔茨海默病 (AD) 中神经炎症的关键点.
- 开发有效的生物药物来监测和治疗AD需要高效的大脑输送策略.
- 转移素受体 (TfR) 介导的细胞转移提供了一条增强血脑屏障 (BBB) 透的途径.
研究的目的:
- 开发和比较双特异性抗TREM2抗体与不同的TfR结合剂,以改善大脑传递.
- 在AD小鼠模型中确定TREM2的体内正子发射断层扫描 (PET) 成像的最佳抗体格式.
- 评估这些双特异性抗体对量化大脑TREM2水平的有用性.
主要方法:
- 设计了三种针对TREM2并利用TfR结合剂的两种特异性抗体格式.
- 评估了抗体介导的血脑屏障 (BBB) 穿越和TREM2结合.
- 用放射性标记的抗体 (125I和124I) 用于AppNL-G-F的AD小鼠和野生类型对照中的ex vivo和in vivo成像.
主要成果:
- 在所有结构中,IgG-scFv2双特异抗体格式显示了最高的脑吸收率.
- 在注射后48小时和72小时,与野生类型对照相比,在NL-G-F小鼠中观察到IgG-scFv2的大脑度显著升高.
- 在体内PET成像证实TREM2可视化的增强,抗体吸收与大脑同质物中TREM2水平相关.
结论:
- IgG-scFv2双特异性抗体是TREM2的非侵入性体内PET成像的有希望的放射性联体.
- 这种方法推进了对阿尔茨海默氏症神经炎症的研究,并支持开发新型治疗方法.
- 这些发现强调了TfR介导的脑成像剂在神经退行性疾病中的潜力.
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