在小鼠的缺血性中风后,大脑中肠道细菌的存在增加
Alex Peh1,2, Evany Dinakis1, Michael Nakai1
1Hypertension Research Laboratory, School of Biological Sciences, Monash University, Melbourne, Australia.
Gut microbes
|January 26, 2026
概括
脑卒中并发症可能是由肠道细菌进入大脑引起的. 这项研究表明,中风后同情神经系统的激活促进了细菌迁移,使小鼠的运动功能恶化.
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:
- 系统性感染经常使中风的结果复杂化,可能源于肠道屏障功能障碍和细菌转移.
- 肠道细菌在中风后转移到大脑的存在和作用在很大程度上仍未被探索.
研究的目的:
- 为了调查肠道细菌是否在中风后转移到大脑并导致神经元损伤.
- 探索细菌转移背后的机制及其对中风病理和功能缺陷的影响.
主要方法:
- 使用缺血性中风的小鼠模型 (光血栓性中风和中脑动脉封闭).
- 使用细菌染色 (糖,脂多糖) 和定量PCR来检测和量化脑组织和血液中的细菌.
- 评估交感神经系统抑制对肠道透性,细菌负载和中风结果的影响.
主要成果:
- 在中风模型小鼠的缺血半球中检测到显著的细菌存在 (类甘油和脂聚糖合物阳性).
- 遭受中风的无细菌小鼠在缺血性大脑中没有显示细菌存在,证实了肠道起源.
- 在缺血半球和血液中观察到细菌负荷增加,与肠上皮和血脑屏障的破坏相关.
- 抑制交感色调降低了肠道透性,大脑细菌负载和功能缺陷,但没有改变脑细胞亡,神经炎症或心脏病发作体积.
结论:
- 脑卒中引起的交感神经系统激活有助于肠道细菌转移到缺血大脑.
- 在中风后,细菌迁移到大脑中会加剧运动功能缺陷.
- 准交感神经系统可能提供一种治疗策略,以减轻与中风相关的细菌转移,并改善功能恢复.
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