周门性巨细胞可以保护肝脏免受开始性炎症的影响
Yu Miyamoto1,2,3, Junichi Kikuta1,2,3,4, Takahiro Matsui1,5
1Department of Immunology and Cell Biology, Graduate School of Medicine and Frontier Biosciences, Osaka University, Osaka, Japan.
Nature
|April 24, 2024
概括
肠道细菌诱导肝脏的免疫抑制巨细胞, 抑制炎症. 这些Marco+巨细胞的缺乏会加剧肝脏疾病,如原发性硬化胆炎 (PSC) 和非酒精性脂肪肝炎 (NASH).
科学领域:
- 免疫学
- 肝病学
- 微生物学
背景情况:
- 肝脏独特的区域结构,具有明显的周门 (PV) 和周中心 (PC) 静脉区域,影响免疫细胞功能.
- 肝脏区域的功能性免疫差异,特别是在巨细胞群中,尚不清楚.
研究的目的:
- 研究肝脏区域特异性免疫细胞在调节炎症中的作用.
- 确定肠道微生物群影响肝脏免疫和炎症反应的机制.
主要方法:
- 检查活组织中的炎症反应.
- 区域特异性单细胞转录组学,用于分析细胞组成和基因表达.
- 研究肠道微生物群的作用的动物模型和无菌小鼠.
- 基因操纵 (马科缺陷) 和特定巨子集的功能性切除.
主要成果:
- 在肝脏PV区域抑制炎症反应,与免疫抑制巨细胞的丰富相关.
- 这些巨细胞表达高水平的互白素-10和Marco,这是一个捕获炎症触发物的捕食受体.
- 肠道微生物群,特别是Odoribacteraceae家族及其代谢物异甲醇酸,诱导这些Marco+免疫抑制巨细胞.
- 在NASH模型中,Marco+巨细胞的缺陷或切除会加剧肝炎,导致类似PSC的表型和恶化的脂肪.
结论:
- 在肝脏的周门区域中诱导Marco+免疫抑制的肠道细菌,作为对过度炎症的关键自我限制机制.
- 这些保护性巨细胞的功能障碍或减少有助于慢性肝病的发生,包括PSC和NASH.
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