中性粒细胞衍生反应剂在Streptococcus pyogenes中诱导一种短暂的SpeB阴性表型
Patience Shumba1, Thomas Sura2, Kirsten Moll3
1Department of Molecular Genetics and Infection Biology, University of Greifswald, Greifswald, Germany.
Journal of biomedical science
|July 10, 2023
概括
中性粒细胞会触发Streptococcus pyogenes变为SpeB阴性,从而提高感染中的生存率. 这种由中性粒细胞分子驱动的适应,为死结软组织感染 (NSTI) 提供了新的治疗点.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 病变的发生和发病.
背景情况:
- 菌 pyogenes (GAS) 致使死亡软组织感染 (NSTI).
- 气体适应以逃避免疫清除,通常通过降低毒性因素,如链球菌热原性外毒素B (SpeB).
- 已知CovRS突变和Sda1 DNase是SpeB阴性变异的驱动因素.
研究的目的:
- 研究一种用于生成 SpeB 阴性 GAS 变体的替代机制.
- 了解中性粒细胞在NSTIs期间GAS适应中的作用.
- 为了确定NSTI的治疗目标.
主要方法:
- 在患者活检上进行免疫组织化学检查,以评估细菌和免疫细胞透,亡和炎症.
- 西部斑点,素和蛋白质分解活性测试以确定SpeB分泌和活性.
- 质谱测量以分析GAS蛋白质组和中性粒细胞分泌组.
主要成果:
- 中性粒细胞效应分子可逆地抑制了GAS中的SpeB分泌.
- 在NSTI患者中,SpeB阴性GAS克隆的频率增加与炎症和中性粒细胞活性相关.
- 从组织中分离的GAS表达但不分泌SpeB;功能在从组织压力中去除后恢复.
- 过氧化和低酸被确定为诱导这种表型的关键中性粒细胞衍生物剂.
- SpeB阴性GAS在中性粒细胞中表现出增强的存活率,并促进进一步的脱粒.
结论:
- 中性粒细胞利用效应分子在GAS中诱导可逆的SpeB阴性表型,有助于NSTIs中的细菌生存.
- 这种中性粒细胞介导的适应突显了软组织环境中的GAS异质性和适应性策略.
- 这些发现为针对GAS NSTIs的治疗干预提出了新的目标.
关键词:
死的软组织感染.中性粒细胞中的中性粒细胞.SpeBB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB SpeB这是一种Streptococcus pyogenes.更多相关视频
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