细菌表面的脂蛋白调解了Streptococcus pneumoniae的表皮微侵袭
Jia Mun Chan1, Elisa Ramos-Sevillano2, Modupeh Betts1
1Research Department of Infection, Division of Infection and Immunity, University College London, London, United Kingdom.
Infection and immunity
|April 17, 2024
概括
在Streptococcus pneumoniae中lgt的突变减少了上皮质炎症. 然而,细菌脂蛋白库的差异不能解释表皮细胞微侵袭的变化,这表明翻译后的修改是关键.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 肺炎链球菌是一种常见的上呼吸道殖民者.
- 鼻殖民是肺炎球菌疾病的先决条件.
- 肺炎球菌可以侵入上皮细胞而不会在健康个体中引起疾病.
研究的目的:
- 调查肺炎球菌脂蛋白在上皮细胞微侵袭中的作用.
- 为了确定TLR2识别的脂蛋白的表面表达是否介导入侵.
- 为了探索由于差异性脂蛋白谱的微侵袭的物种内变异.
主要方法:
- 在S. pneumoniae血清型4和6B的lgt基因的突变.
- 评估TLR2信号和干扰素反应激活.
- 量化细菌粘附和上皮细胞的微侵袭.
- 基因组分析以确定独特的脂蛋白,例如BHN418.18中的palA.
主要成果:
- lgt突变取消了TLR2信号传递,降低了干扰素信号传递.
- 只有BHN418 lgt突变在坚持和微侵袭方面显著减弱.
- 在BHN418中发现了一种新型脂蛋白,palA,但没有显著改变微侵袭.
- 在微侵袭中观察到物种内变异,尽管有不同的脂蛋白谱.
结论:
- lgt的突变减弱了上皮质的炎症反应.
- 微侵袭的物种内变异存在,但不能通过差异性脂蛋白剧目来解释.
- 假定脂蛋白的翻译后修改会影响微侵袭.
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