在野生型小鼠中,肠道微生物群的传播通过粉样蛋白病理诱导认知障碍
Chenyi Yang1, Wei Qi1, Wei Li1
1Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, USA.
Neuroscience
|February 27, 2026
概括
在早期接触阿尔茨海默氏病 (AD) 鼠标微生物群,通过共同住房诱导肠道失生症,粉样蛋白病理和野外类型小鼠的认知缺陷. 益生菌治疗减轻了这些类似AD的效应.
科学领域:
- 神经科学是一个神经科学.
- 微生物学 微生物学
- 遗传学 遗传学 是一个
背景情况:
- 阿尔茨海默病 (AD) 是痴呆的主要原因,通常是零星的,受肠道微生物群等非遗传因素的影响.
- 在AD转基因 (Tg) 和野生型 (WT) 鼠之间早期的微生物传播可能会导致认知问题,但机制尚不清楚.
研究的目的:
- 研究肠道微生物群转移的机制及其对WT小鼠在生命早期接触AD Tg小鼠的认知功能和粉样蛋白病理的影响.
- 为了评估特定益生菌干预的治疗疗效.
主要方法:
- 一个月大的WT小鼠与5XFAD (AD Tg) 小鼠共住三个月.
- 用16S rRNA测序分析了肠道微生物组成.
- 使用ELISA和纳米塑传感器测量了大脑粉样蛋白-β 42 (Aβ42) 水平.
- 认知功能通过莫里斯水迷宫和巴恩斯迷宫进行评估.
- 他们接受了益生菌治疗 (Lactobacillus reuteri和Bifidobacterium pseudolongum).
主要成果:
- 与AD Tg小鼠 (ADWT) 共住的WT小鼠表现出与AD Tg小鼠相似的微生物形状的肠道失调.
- 在ADWT小鼠中,Aβ42水平在大脑中升高,并出现认知障碍.
- 益生菌干预成功改变了肠道微生物组成,并降低了ADWT小鼠皮质和海马体中的Aβ42水平.
结论:
- 微生物群通过早期共同住房的转移会诱导WT小鼠的肠道失调,粉样蛋白病理和认知缺陷.
- 有针对性的益生菌干预可以有效地减轻这些微生物群驱动的阿尔茨海默氏症病样效应.
- 这些发现支持AD病变发生的非遗传,微生物群驱动的途径.
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