微生物群的枯竭使老化的大脑恢复青春
bioRxiv : the preprint server for biology
|February 23, 2026
概括
在老年小鼠中,消耗肠道微生物组逆转了大脑衰老标志物,并改善了记忆力. 这表明,准微生物炎症可以促进大脑健康和衰老中的认知性.
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:
- 衰老与认知能力下降和神经退行有关.
- 人们越来越多地认识到肠道微生物在大脑衰老中的作用,但人们对其了解甚少.
- 分子和细胞变化包括血管完整性受损,脱髓化,神经发生减少和慢性炎症.
研究的目的:
- 研究肠道微生物群枯竭对小鼠大脑衰老的影响.
- 阐明肠道微生物群影响大脑衰老的机制.
- 评估针对肠道微生物组促进大脑健康的潜力.
主要方法:
- 老老鼠接受了抗生素治疗,以耗尽肠道微生物群.
- 单核RNA测序用于转录组分析.
- 评估了大脑结构,神经发生,髓化,微质反应和认知功能.
- 分析了大脑和血中的细胞因子水平.
主要成果:
- 抗生素治疗导致老老鼠大脑的分子和结构复苏.
- 转录组分析显示,大脑细胞类型之间存在显著的变化.
- 在血管密度,髓化,神经发生和微质反应能力降低方面观察到改善.
- 微生物群枯竭的小鼠表现出增强的海马体记忆性能.
- 促炎性细胞因子水平下降,eotaxin-1被确定为关键因素.
- 仅仅抑制eotaxin-1可以部分逆转大脑衰老的现象.
结论:
- 与年龄相关的微生物炎症对大脑衰老有着重大影响.
- 肠道微生物群的枯竭减缓了大脑的衰老,恢复了年轻的分子,细胞和功能特征.
- 准肠道微生物组或其媒介提供了一种潜在的非侵入性策略,可以在衰老过程中增强大脑健康和认知性.
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