肠道细菌代谢物意米达 propionate 增强了阿尔茨海默氏病的病理学
bioRxiv : the preprint server for biology
|June 12, 2025
概括
一种肠道细菌代谢物,伊米达 propionate (ImP),与认知衰退和阿尔茨海默病 (AD) 生物标志物有关. 这种代谢物可能会通过神经退行性和脑血管路径驱动AD的进展,提供潜在的早期干预目标.
科学领域:
- 微生物学 微生物学
- 神经科学是一个神经科学.
- 代谢学 代谢学 代谢学
背景情况:
- 肠道微生物群影响宿主的新陈代谢,免疫力和神经功能.
- 阿尔茨海默氏病 (AD) 的发病过程涉及复杂的相互作用,包括潜在的肠道微生物组贡献.
- 细菌代谢物伊米达 propionate (ImP) 与AD并发症,如2型糖尿病有关.
研究的目的:
- 为了研究血ImP水平与患AD风险个体的认知功能之间的关联.
- 探索肠道细菌在ImP合成中的作用及其与AD生物标志物的相关性.
- 确定ImP对神经退行和血脑屏障 (BBB) 完整性的影响.
主要方法:
- 在一组超过1,100名认知不受损的个体中分析了血ImP水平和认知得分.
- 基因组分析分析以识别产生ImP的肠道细菌,并将它们的数量与认知和AD生物标志物相关联.
- 对小鼠进行IMP的试验,以评估神经退行性途径,AD类的神经病理学和BBB透性.
- 使用人类大脑内皮细胞进行体外研究,以评估ImP对细胞完整性的影响.
主要成果:
- 血ImP水平升高与较低的认知评分和AD生物标志物的增加相关.
- 编码ImP合成酶 (urocanate reductase,UrdA) 的肠道细菌的丰富性与认知指标和AD生物标志物相关.
- 在小鼠中慢性IMP的使用激活了神经退行性通路,加剧了AD类的神经病理,并增加了BBB的透性.
- 实验室研究表明,ImP损害了人类大脑内皮细胞的完整性.
结论:
- 升高的ImP与认知障碍和AD病理学有关.
- 通过诱导神经退行和损害脑血管完整性,ImP可能会促进AD的进展.
- ImP是阿尔茨海默病早期干预的潜在治疗目标.
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