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肠道屏障功能的年龄相关变化:微生物群和TLR4信号的参与
Yakun Xing1,2, Xingyu Zhao1,2, Xinyu Li2,3
1School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China.
Biology
|March 13, 2026
概括
老龄化严重改变肠道屏障,影响免疫力和健康. 收费类受体4 (TLR4) 信号传递对于与年龄相关的宿主微生物群相互作用的重新连接至关重要.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 胃肠病学 胃肠病学
背景情况:
- 肠道屏障与年龄相关的变化会影响局部免疫力和全身健康.
- 整个生命中协调免疫和微生物动态的机制尚未完全理解.
- 收费类受体4 (TLR4) 是宿主微生物群相互作用的关键媒介.
研究的目的:
- 为了研究与年龄相关的肠道屏障功能变化.
- 阐明托尔类受体4 (TLR4) 在这些与年龄相关的变化中的作用.
- 了解整个生命周期内宿主微生物群相互作用的动态.
主要方法:
- 使用C57BL / 6J和TLR4淘汰赛小鼠在不同发育阶段 (幼,成年人,中年,老年).
- 采用了组织学,微生物组分析,SCFA分析,细胞因子量化,ex vivo测试和转录组学.
- 分析了结肠结构,微生物组成,免疫反应和信号通路.
主要成果:
- 在整个生命周期中确定了肠道重塑的不同阶段.
- 观察到微生物群组成和短链脂肪酸 (SCFA) 生产的年龄相关变化.
- 在老年小鼠中表现出增加的促炎性细胞因子和麻木的免疫反应,这些在TLR4淘汰赛小鼠中不存在.
- 在年轻和老小鼠中揭示了双相PI3K/Akt通路的激活.
结论:
- 衰老诱导宿主代谢和免疫路径的系统性重新连接,以应对衰老的微生物群.
- 收费类受体4 (TLR4) 信号传递在与年龄相关的肠功能衰退中起着至关重要的作用.
- 整个生命周期的微生物群-宿主信号轴代表了与年龄相关的肠道功能障碍的潜在治疗目标.
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