在产后发育期间上呼吸道屏障功能受损会导致侵袭性肺炎球菌病的发生
Kristen L Lokken-Toyli1, Surya D Aggarwal1, Gavyn Chern Wei Bee1
1Department of Microbiology, New York University School of Medicine, New York, New York, United States of America.
婴儿小鼠由于上呼吸道 (URT) 屏障功能受损,对Streptococcus pneumoniae (Spn) 感染的易感性增加. 这种脆弱性,以延迟的粘膜干净和改变的紧结基因表达为特征,在生命早期促进了细菌的传播和血液传播.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 发展生物学 发展生物学
背景情况:
- 婴儿容易受到侵入性呼吸道和胃肠道感染.
- 了解细菌传播的年龄相关机制对于儿科健康至关重要.
研究的目的:
- 调查婴儿小鼠对Streptococcus pneumoniae (Spn) 敏感性增加背后的机制.
- 为了阐明年龄相关的细菌从上呼吸道 (URT) 粘膜传播.
主要方法:
- 开发了一种用于SPN感染的婴儿小鼠模型.
- 利用分子条形码来追踪细菌的传播.
- 进行了URT表皮的转录造型.
- 评估了URT屏障的透性和粘膜清除.
主要成果:
- 与成年人相比,婴儿小鼠的生存率降低,Spn细菌病的增加.
- 细菌传播与免疫细胞透或特定的炎症途径无关.
- 婴儿URT上皮无法调节紧结基因,这表明屏障功能受损.
- 在婴儿小鼠中观察到URT透性增加和粘膜清除延迟.
结论:
- 在出生后早期的发育过程中存在着脆弱性的关键窗口.
- 改变的粘膜屏障功能,特别是受损的紧密结节和延迟的清除,有助于婴儿的细菌传播.
- 这些发现强调了粘膜屏障成熟对于预防侵袭性感染的重要性.
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