携带脂聚糖的肠系细菌囊泡促进微质介导的突触修剪
Xiaoduo Zhao1,2, Jiayi Yu1,3, Bin Xu1
1Department of Pathology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China.
概括
肠道细菌成分,如由细菌衍生的细胞外囊泡 (bEVs) 携带的脂多糖 (LPS),可以穿过血脑屏障 (BBB). 这一过程通过激活大脑免疫细胞并导致突触损失,导致阿尔茨海默病 (AD).
科学领域:
- 神经科学是一个神经科学.
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
背景情况:
- 越来越多的证据将肠道微生物群 (GM) 与阿尔茨海默病 (AD) 联系起来.
- 在AD大脑中发现了升高的脂聚糖化物 (LPS) 水平,但其穿越血脑屏障 (BBB) 的传输机制尚不清楚.
- 据推测,细菌衍生的细胞外囊泡 (bEVs) 可以将LPS传输到BBB.
研究的目的:
- 研究肠道微生物群衍生的细胞外囊泡 (bEVs) 在通过血脑屏障 (BBB) 运输脂多糖 (LPS) 的作用.
- 阐明bEVs在阿尔茨海默病 (AD) 中导致神经炎症和突触修剪的机制.
主要方法:
- 从人类和老鼠便和血液中提取和测量bEV中的LPS.
- 在体内成像和免疫光检测以确认bEVs在BBB上的运输.
- 在体外和体内研究bEVs在微质激活和突触修剪中的作用.
主要成果:
- 与健康个体相比,在AD患者的血中检测到含有LPS的bEV升高.
- 据证实,携带LPS的bEV穿过了BBB.
- 这些bEV激活了微质Piezo1,导致通过C1q-C3补充通路过度的突触修剪.
结论:
- 来自肠道微生物群的bEV可以穿越BBB,而LPS对于这种透至关重要.
- bEV与AD进展密切相关,介导微质激活和突触修剪.
- 微质Piezo1在bEV诱导的过度突触修剪中发挥作用,突出了AD病变发生的新途径.
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