在APOE4小鼠中以性别和基因型特定的方式调节肠道微生物和大脑代谢轴
Kira Ivanich1,2,3, Andrew Yackzan4, Abeoseh Flemister1
1Department of Radiology, University of Missouri, Columbia, Missouri, USA.
Journal of neurochemistry
|September 1, 2025
概括
性饮食 (KD) 重塑了小鼠的肠道微生物组,改善了大脑代谢物,尤其是女性APOE4携带者. 这表明KD可能是降低阿尔茨海默病风险的精准营养策略.
科学领域:
- 神经科学
- 微生物学
- 营养科学
背景情况:
- 无脂蛋白E4 (APOE4) 基因是阿尔茨海默病 (AD) 的重要遗传风险因素.
- 早期的AD病变包括大脑代谢功能障碍和肠道微生物组的改变.
- 针对这些早期变化的饮食干预措施可以减轻AD风险.
研究的目的:
- 对年轻APOE4小鼠的肠道微生物组和大脑代谢物产生性饮食 (KD) 的影响进行研究.
- 将这些效应与APOE3小鼠的效应进行比较,作为中性风险对照.
- 识别与神经保护相关的微生物代谢特征.
主要方法:
- 雄性和雌性APOE3和APOE4小鼠在16周内接受了对照或KD.
- 分析了肠道微生物的组成.
- 针对性大脑代谢学评估了关键代谢物水平.
主要成果:
- KD增加了有益的肠道细菌 (例如,乳杆菌) 和减少了致病细菌 (例如,肠道细菌).
- 微生物转移与改善的脑代谢物相关联,这些代谢物涉及线粒体功能,神经传递,氧化还原平衡和脂质代谢.
- APOE4雌性小鼠表现出最显著的益处,包括恢复微生物群多样性和正常化大脑代谢物.
结论:
- 基因饮食可以根据基因型和性别重新编程肠-大脑轴.
- 乳酸菌种和B. intestinalis可以作为大脑健康的生物标志物.
- KD 显示出作为精确营养策略来降低阿尔茨海默病风险的潜力,特别是在无症状的女性APOE4携带者中.
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