定数感知调节器LsrR通过对cysN的直接调节来调节大肠杆菌的病原性
Saqib Nawaz1, Zhihao Wang1, Wei Jiang1
1Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Minhang, Shanghai, People's Republic of China.
Infection and immunity
|November 28, 2025
概括
禽类致病性大肠杆菌 (APEC) 毒性是由LsrR-cysN通路控制的. 破坏这个轴线将大大减少APEC的规模.
科学领域:
- 微生物学 微生物学
- 细菌病原体的产生
- 禽类的健康 禽类的健康
背景情况:
- 禽类致病性大肠杆菌 (APEC) 在家禽中造成重大经济损失.
- 在APEC地区,抗生素耐药性是一个越来越令人担忧的问题.
- 硫代谢在APEC毒性中的作用尚不清楚.
研究的目的:
- 确定管理APEC毒性的新型监管途径.
- 调查硫代谢在APEC病原发生中的作用.
- 为APEC探索潜在的抗病毒性目标.
主要方法:
- 在APEC中调查了LsrR-cysN监管轴.
- 进行了基因删除和cysN.的功能分析.
- 评估的毒性因素包括生物膜形成,血清耐药性,粘附性,入侵性和运动性.
- 评估了抗生素耐药性概况和排泄表达.
- 利用一种小鼠模型来确定体内毒性和宿主免疫反应.
主要成果:
- 这种LsrR蛋白直接调节cysN转录.
- 删除cysN显著减弱了APEC的毒性在体外和体内.
- APEC cysN突变体显示出与排泄上调相关的抗生素耐药性变化.
- 在体内研究表明,小鼠的死亡率和殖民功能受损减少了75%.
- 宿主免疫反应受到调节,细胞因子概况发生变化.
结论:
- LsrR-cysN轴是一个关键的调节器,连接定量检测到APEC毒性.
- cysN对于APEC的多重毒性属性至关重要.
- 针对LsrR-cysN通路为针对APEC的新型抗病毒疗法提供了一个有希望的策略.
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