末酶O通过裂解宿主防御类cathelicidins来促进Streptococcus suis的免疫逃避
Mingjie Jin1, Siyu Liang1, Jing Wang1
1State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, China.
Virulence
|November 27, 2023
概括
瑞杆菌使用PepO蛋白酶降解宿主cathelicidins,如LL-37,使细菌的生存和感染. 这种机制有助于细菌逃避免疫防御并引起疾病.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 细菌学 细菌学是一门学科.
背景情况:
- 我国菌株是一种致动物性病原体,在全球引起严重感染.
- 天生的免疫,包括cathelicidins,与细菌入侵者作斗争.
- 病原体必须逃避宿主防御的成功感染.
研究的目的:
- 调查Streptococcus suis细胞外内酶O (PepO) 在逃避甲基胺介导免疫中的作用.
- 了解PepO如何对S. suis的病原体产生作出贡献.
主要方法:
- 在S. suis. 中对pePO的基因删除.
- 测试测量细菌对人类 (LL-37) 和老鼠 (mCRAMP) 甲基素的敏感性.
- 对PepO的蛋白质分解活性测定针对cathelicidins.
- S. suis细菌病的小鼠模型,以评估器官损伤和细菌负担.
主要成果:
- 删除pePO增加了S. suis对LL-37和mCRAMP的敏感性.
- 佩波直接切割并使LL-37和mCRAMP无活化.
- 通过PepO介导的凯瑟利西丁裂变损害了中性粒细胞的招募和生存.
- 佩波还抑制了巨细胞中 catelicidin 诱导的 lysosome 发育.
- 在小鼠感染模型中,PepO的损失减轻了器官损伤和减少了细菌负载.
结论:
- 我国链球菌利用PepO蛋白酶作为一个关键的毒性因子.
- 佩波可降解甲基,从而抑制先天性免疫反应.
- 这种蛋白质溶解策略有助于S. suis的致病和免疫逃避.
关键词:
在LL-37中,我们可以看到LL-37中,我们可以看到LL-37.这是一种Streptococcus suis.凯瑟利西西丁的存在宿主防御的使用.mCRAMPP 这是一个很好的解决方案.蛋白质酶蛋白质酶是一种蛋白质.更多相关视频
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