监测细胞内复制动力学揭示了骨质母细胞内部高比例的非复制抗生素耐受性金黄色葡萄球菌
Florian C Marro1,2, Jacques Brocard3, Allison Faure2
1Evotec ID Lyon, In Vitro Biology, Infectious Diseases and Antibacterials Unit, Lyon, France.
PLoS pathogens
|September 23, 2025
概括
黄金葡萄球菌的骨感染往往无法治疗,因为细菌在骨细胞内存活. 这些幸存的细菌成为非复制性和抗生素耐受性,阻碍了根除并导致复发.
科学领域:
- 微生物学 微生物学
- 传染性疾病 传染性疾病
- 细胞生物学 细胞生物学
背景情况:
- 黄金葡萄球菌的骨和关节感染带来了重大的治疗挑战,往往导致治疗失败和复发.
- 骨质细胞内细胞内黄金葡萄球菌的不完全根除是持续感染的潜在原因.
- 细胞内黄金葡萄球菌在骨质母细胞内存活的机制尚不清楚.
研究的目的:
- 为了研究骨质细胞内黄金葡萄球菌的细胞内复制动态.
- 在骨质母细胞中,对抗生素治疗中存活的金黄色葡萄球菌的表型进行表征.
- 阐明细胞内抗生素耐受性对骨感染治疗失败的贡献.
主要方法:
- 利用自动实时光显微镜进行单个宿主细胞水平监测.
- 在MG-63骨质细胞细胞系中研究了临床的金黄色葡萄球菌菌株及其与里芬素治疗的幸存者.
- 评估了抗生素治疗后的细菌复制动态和生存率.
主要成果:
- 黄金葡萄球菌在骨质母细胞内表现出异质的复制动态,无论是在菌株内还是跨菌株.
- 瑞芬素治疗的存活率以均的非复制性细胞内表型为特征.
- 里法西因在有限程度上杀死 (<0.3 log) 细胞内黄金葡萄球菌,主要是在早期感染期间.
- 大多数存活的细胞内黄金葡萄球菌仍然不复制,但在宿主细胞释放后保留了再生能力.
结论:
- 骨质细胞内细胞内黄金葡萄球菌的很大一部分采用非复制性,抗生素耐受性的状态.
- 这种细胞内抗生素耐受性可能是导致白 Staphylococcus aureus 骨和关节感染治疗失败率高的关键因素.
- 针对细胞内,非复制性细菌的进一步研究是有必要的,以改善治疗策略.
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