肝细胞的Toll类受体对肝素对病原体和病原体衍生联体的炎症反应有所贡献
Katharina Bonitz1, Silvia Colucci1,2, Ruiyue Qiu1
1Department of Pediatric Oncology, Hematology and Immunology Hopp Children's Cancer Center (KiTZ), University Hospital Heidelberg Heidelberg Germany.
HemaSphere
|April 4, 2025
概括
肝细胞可以通过托尔类受体 (TLR) 直接检测病原体信号,从而触发独立于其他免疫细胞的肝素生产. 这一发现突出显示了肝细胞.
科学领域:
- 免疫学 免疫学 免疫学
- 肝病学 肝病学是一种肝病学.
- 传染性疾病 传染性疾病
背景情况:
- 炎症性贫血 (AI) 涉及铁的限制,这是一种先天的免疫机制,限制了病原体的复制.
- 在感染期间,免疫细胞检测到病原体相关的分子模式 (PAMPs),释放细胞因子,如介素-6 (IL-6).
- IL-6刺激肝细胞产生肝素,阻断巨细胞的铁出口,导致低血症.
研究的目的:
- 调查肝细胞上的Toll样受体 (TLR) 是否直接识别PAMP并诱导肝素.
- 阐明参与PAMP诱导的肝细胞中肝素上调的信号通路.
- 确定肝细胞与巨细胞在肝素对PAMP的反应中的作用.
主要方法:
- 通过各种针对TLRs1-9的PAMPs刺激初级小鼠肝细胞.
- 在用鞭毛蛋白,FSL1,热杀死*金黄色葡萄球菌* (HKSA) 和*Brucella abortus* (HKBA) 刺激后测量了肝素的表达.
- 巨细胞:肝细胞共同培养和活体肝 perfusion 模型被用于评估细胞特异性反应和信号通路 (TLR-MAPK轴).
主要成果:
- 肝细胞对TLR5 (鞭毛蛋白) 和TLR2:TLR6 (FSL1) 配体以及HKSA和HKBA作出反应,通过升调肝素.
- 这种肝素诱导是快速的,IL-6独立的,并通过TLR-mitogen激活蛋白激酶 (MAPK) 途径进行介导.
- 反应依赖于肝细胞中的TLR2:TLR6表达,并且独立于巨细胞因子分泌.
结论:
- 肝细胞具有通过TLR直接识别PAMP和病原体的内在能力.
- 这种直接的识别导致细胞因子独立的肝素上调,有助于铁的限制.
- 在感染和炎症期间,肝细胞成为铁代谢的关键直接调节者.
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