败血症加剧阿尔茨海默病的病理生理学,调节肠道微生物组,增加神经炎症和粉样蛋白负担
Vijayasree V Giridharan1, Celso S G Catumbela2, Carlos Henrique R Catalão1,3
1Faillace Department of Psychiatry and Behavioural Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, USA.
Molecular psychiatry
|July 14, 2023
概括
周围感染,如败血症,加速阿尔茨海默病 (AD) 病理和小鼠模型中的认知衰退. 这项研究将系统性感染与粉样蛋白负担增加和大脑免疫力改变联系起来,强调感染是潜在的AD风险因素.
科学领域:
- 神经科学是一个神经科学.
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
背景情况:
- 阿尔茨海默病 (AD) 的分子机制越来越被理解,但它的起源,特别是外围感染的作用,仍然不清楚.
- 假设周围感染是一个重要的风险因素,有助于AD病理的发展和进展.
研究的目的:
- 为了调查外围感染加剧阿尔茨海默病病理学的假设.
- 在AD小鼠模型中评估败血症对认知功能,大脑粉样蛋白负担,神经炎症和肠道健康的影响.
主要方法:
- APP/PS1小鼠接受了结和穿孔 (CLP) 手术,以诱导多微生物性败血症或假手术.
- 在手术后30天和120天使用新型物体识别 (NOR) 任务评估认知功能.
- 评估大脑粉样β (Aβ) 水平,炎症调解剂,质标记物,肠道微生物组合 (16S rRNA测序),肠道形态和短链脂肪酸 (SCFA).
主要成果:
- 败血症显著加快了APP/PS1小鼠的认知衰退.
- 周围感染导致Aβ不溶性增加,大脑细胞因子概况发生变化 (IL-10降低,IL-13增加,eotaxin增加),以及斑块周围增强的微质激活.
- 败血症对肠道微生物群的多样性产生了负面影响,减少了SCFA,改变了大肠和结肠形态.
结论:
- 在临床前的AD模型中,败血症诱导的外周感染加速了认知衰退和AD病理.
- 研究结果表明,系统性感染,肠道失调,以及阿尔茨海默病的特征性神经炎症和粉样化症的恶化之间存在联系.
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