在小鼠中,亚致命的系统性LPS使肠-光线病原体能够通过氧物种介导的微生物群抑制来繁殖
Sanne Kroon1, Dejan Malcic1, Lena Weidert1,2
1Institute of Microbiology, Department of Biology, ETH Zürich, Zürich, Switzerland.
Nature communications
|March 21, 2025
概括
来自内毒素的系统性免疫激活促进了机会性肠道病原体,如大肠杆菌. 这通过Toll-like受体4信号传递发生,增加氧气物种并改变肠道微生物群平衡.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 胃肠病学 胃肠病学
背景情况:
- 系统性免疫激活,通常是由内毒素 (升高的脂多糖) 驱动的,在危急疾病中很常见.
- 观察到肠道微生物群的变化,包括机会性病原体的增加,但与内毒性病的因果关系尚不清楚.
研究的目的:
- 调查急性内毒性病和肠-光线机会性病原体扩散之间的因果关系.
- 阐明在系统性免疫激活过程中驱动病原体过度生长的潜在机制.
主要方法:
- 在小鼠中模拟急性,病理生理性脂多糖度.
- 量化肠道微生物组成的变化,特别是机会性病原体.
- 调查肠道光线中托尔类受体4 (TLR4) 和氧物种的作用.
主要成果:
- 在24小时内,系统性脂多糖暴露导致了克莱布西拉肺炎,大肠杆菌,菌菌和沙门氏菌 Typhimurium 的100-10,000倍扩张.
- 这种扩张发生在没有明显肠病症的证据的情况下.
- 从机制上讲,TLR4激活增加了肠-光线反应性氧物种,抑制了微生物群发酵,并通过氧化呼吸促进了随机无氧性病原体的生长.
结论:
- 急性系统性免疫激活暂时破坏肠道微生物群的恒常性.
- 内毒毒症有利于肠道中机会性病原体的扩散.
- 这种机制可能会增加重症患者的感染风险.
更多相关视频
12:27The Utilization of Oropharyngeal Intratracheal PAMP Administration and Bronchoalveolar Lavage to Evaluate the Host Immune Response in Mice
Published on: April 2, 2014
16.6K
08:24Injections of Lipopolysaccharide into Mice to Mimic Entrance of Microbial-derived Products After Intestinal Barrier Breach
Published on: May 2, 2018
19.3K
相关概念视频
Dysbiosis of the Gut Microbiota
The human gut microbiome includes a diverse array of microbial species, including beneficial commensals and opportunistic pathogens, which interact to support host health. These microbes contribute to essential functions such as nutrient metabolism, immune system modulation, and maintenance of intestinal barrier integrity. However, disruptions to this equilibrium—referred to as dysbiosis—can have widespread physiological consequences.Dysbiosis is often characterized by reduced microbial...
Microbiota Modulation by Antibiotics
Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...
