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肝脏的鼻状细胞消除了血液传播的菌体K1FF
Javier Sánchez Romano1, Jaione Simón-Santamaría1, Peter McCourt1
1Department of Medical Biology, UiT The Arctic University of Norway, Tromsø, Norway.
mSphere
|February 28, 2024
概括
菌体治疗面临着快速清除的挑战. 这项研究表明,肝脏库普弗细胞 (KCs) 和肝脏侧侧内皮细胞 (LSECs) 从血液中清除细菌菌体 (菌体),其中KCs发挥着主要作用.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 药理学 药理学是指药理学的学科.
背景情况:
- 菌体 (菌体) 疗法是针对多药耐药细菌的抗生素有前途的替代方案.
- 了解菌体的药理动力学,特别是它们在体内的分布和清除,对于成功的菌体治疗至关重要.
- 肝脏是免疫监测的主要器官,是潜在的菌体隔离的关键地点.
研究的目的:
- 在小鼠静脉注射后,研究肝脏侧鼻内皮细胞 (LSECs) 和库弗弗细胞 (KCs) 在清除大肠杆菌 K1Fg10b::gfp (K1Fgfp) 的作用.
- 为了确定K1Fgfp的循环半衰期,器官分布和肝细胞局部.
- 探索LSEC和KC体外吸收K1Fgfp的机制,包括opsonization的影响.
主要方法:
- 在小鼠中静脉注射K1Fgfp以评估血液清除,半衰期和器官分布.
- 在体外吸收研究中对原始小鼠和人类LSEC和KC进行隔离和培养.
- 在肝脏组织和培养细胞中对菌体DNA的量化.
- 显微镜和流细胞计分析菌体内化和细胞内贩运.
主要成果:
- 超过95%的K1Fgfp在20分钟内从循环中清除,其中94%局限于肝脏.
- KC和LSEC都将K1Fgfp内化,其中KC显示了更高的吸收比率 (12:1).
- 用等离子体蛋白质的opsonization在体外增强了两种细胞类型的菌体吸收,内化菌体被贩运到 lysosomes,在那里它们的生存能力降低了.
结论:
- 库弗弗细胞是肝脏血液中的细菌的快速清除的主要媒介,肝脏侧侧内皮细胞的贡献很大.
- 菌体的 opsonization 增强细胞吸收,细胞内退化发生在内细胞化后.
- 这些发现凸显了考虑肝脏状细胞种群和适当的剂量策略对于有效的静脉菌体治疗的重要性.
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