黄金葡萄球菌毒素在严重的侵入性感染期间调解内皮质血栓模块素释放
Lisa Seidner1, Emi Tanaka1,2, Olivia Engstrand1
1Center for Infectious Medicine, Department of Medicine Huddinge, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden.
黄金葡萄球菌感染显著增加可溶性血栓模块素 (sTM) 水平在死软组织感染通过切割TM从细胞膜,不像其他细菌. 这揭示了侵入性感染中sTM释放的特定机制.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 传染性疾病 传染性疾病
背景情况:
- 血栓模块素 (TM) 对于血液静止和免疫非常重要.
- 溶性TM (sTM) 是一种严重细菌感染的生物标志物,如死结软组织感染 (NSTI).
- 肌痛转移流失的机制是多样化的,但直接的细菌对软组织细胞的影响不太清楚.
研究的目的:
- 研究细菌刺激对TM释放软组织细胞的直接影响.
- 确定Staphylococcus aureus诱导sTM释放的机制.
- 阐明S. aureus分泌的蛋白质和特异性毒素在TM分泌中的作用.
主要方法:
- 用NSTI临床分离物刺激器官类型模型 (纤维细胞,内皮细胞).
- 在体外刺激内皮单层,用黄金菌分泌的蛋白质.
- 评估TM释放机制:增加表达,细胞毒性或直接裂变.
- 金属蛋白酶抑制剂的使用和对阿尔法毒素和农业调节蛋白质的研究.
主要成果:
- 金黄色葡萄球菌显著增加了sTM水平,而A组链球菌和大肠杆菌的影响很小.
- 黄金菌的农业调节蛋白质通过从内皮细胞膜的直接切割诱导TM脱落.
- 金属蛋白酶抑制剂和α-毒素刺激表明ADAM10参与TM裂变.
- 其他农业调节蛋白也被发现直接切割TM.
结论:
- 黄金葡萄球菌采用一种特定于病原体的机制,涉及农业调节蛋白和潜在的ADAM10来诱导TM脱落.
- 这种分裂机制在侵袭性黄金色杆菌感染中导致血STM水平升高.
- 研究结果提供了对死软组织感染病理生理学的更深入的见解.
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