肠道整体感知功能障碍导致与年龄相关的认知衰退
Timothy O Cox1,2, Ashwarya S Devason1, Alan de Araujo3,4
1Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
Nature
|March 12, 2026
概括
老龄化会通过改变肠道细菌来损害记忆力,从而破坏肠道-大脑信号和海马体功能. 针对这种途径的干预可以恢复老年小鼠的记忆.
科学领域:
- 神经科学是一个神经科学.
- 微生物学 微生物学
- 老年学是指老年学的学科.
背景情况:
- 老龄化与认知能力下降有关,特别是记忆力受损.
- 肠道微生物组及其信号通路越来越多地被认为是大脑功能的调节器.
- 关联肠-大脑通信与与年龄相关的记忆丧失的机制尚不清楚.
研究的目的:
- 绘制老化微生物群及其对认知衰退的功能影响的地图.
- 为了确定与年龄相关的记忆障碍相关的特定肠-大脑信号通路.
- 探索潜在的干预措施,以提高老年人的记忆力.
主要方法:
- 在老鼠一生中对老鼠微生物群的高分辨率映射.
- 研究中链脂肪酸产生细菌 (例如,Parabacteroides goldsteinii) 和GPR84信号的作用.
- 评估阴道 afferent神经元功能和海马激活.
- 测试干预措施,包括菌体疗法,GPR84抑制和阴道活动恢复.
主要成果:
- 特定肠道细菌的积累通过GPR84信号驱动炎症,损害阴道神经功能.
- 这种干扰会削弱向大脑传递的感知信号,导致海马功能障碍和记忆丧失.
- 干预措施,如用菌体准Parabacteroides或抑制GPR84,在老年小鼠中成功增强记忆.
结论:
- 互感功能障碍在与年龄相关的认知衰退中起着关键作用.
- 调节肠-大脑通信提供了一个有希望的治疗策略来抵消记忆丧失.
- 刺激肠道-大脑信号传输的互接受模拟剂可能对大脑衰老有益.
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