甲状腺菌7型分泌系统基质EsxA诱导中性粒细胞外细胞陷在传染性内心炎的形成
Chih-Chieh Hsu1, Yu-Chung Chuang2, Ron-Bin Hsu3
1Department of Microbiology, Soochow University, Taipei, Taiwan.
Scientific reports
|December 12, 2025
概括
第七类分泌系统 (T7SS) 基质EsxA通过诱导中性粒细胞外细胞陷 (NETs) 来帮助Streptococcus gordonii在感染性内心炎中的生存. 这项研究澄清了EsxAA.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 细菌病原体的产生
背景情况:
- 第七类分泌系统 (T7SS) 基质EsxA在病毒菌菌诱导的传染性内心炎 (IE) 中的作用尚不清楚.
- 基因组分析确定了Streptococcus gordonii DL1中的T7SSb位点,包括核心机械蛋白和EsxA基质.
研究的目的:
- 调查EsxA及其通过T7SSb分泌在Streptococcus gordonii诱导的传染性内心炎的发病过程中的作用.
- 通过调节中性粒细胞细胞外陷 (NET) 形成,确定EsxA是否有助于IE中的细菌生存和植被形成.
主要方法:
- 基因组分析以确定S. gordonii DL1.1.中的T7SSb组分.
- 构建和测试essC删除突变体以确认T7SSb介导分泌.
- 在体内IE大鼠模型评估EsxA在细菌存活和植被中的作用.
- 通过Transwell系统和重组EsxA来评估EsxA在诱导NET形成中的作用.
主要成果:
- 在S. gordonii中通过T7SSb确认了EsxA的分泌.
- 在老鼠IE模型中,EsxA缺乏导致细菌存活率降低和植被形成.
- 发现分泌的EsxA诱导了中性粒细胞外细胞陷 (NET) 的形成.
- 通过EsxA介导的NET诱导有助于S. gordonii诱导的IE中的细菌生存和植被.
结论:
- 由T7SSb介导的EsxA分泌对于感染性内心炎中Streptococcus gordonii的致病性至关重要.
- EsxA诱导了NET的形成,这有助于细菌在循环中的生存和植被的发展.
- 准EsxA分泌或与中性粒细胞相互作用可能为IE提供治疗策略.
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