华西口腔医学杂志 ›› 2023, Vol. 41 ›› Issue (4): 385-394.doi: 10.7518/hxkq.2023.2023111

• 基础研究 • 上一篇    下一篇

牙龈卟啉单胞菌来源的脂多糖诱导非酒精性脂肪肝的局部巨噬细胞免疫耐受表型

郭力嘉1(), 刘奕彤2, 陈颖怡2, 徐骏疾2, 刘怡2()   

  1. 1.首都医科大学附属北京口腔医院正畸科,北京 100050
    2.首都医科大学附属北京口腔医院牙周科,北京 100050
  • 收稿日期:2023-04-11 修回日期:2023-05-01 出版日期:2023-08-01 发布日期:2023-07-21
  • 通讯作者: 刘怡 E-mail:guolijia@mail.ccmu.edu.cn;lililiuyi@163.com
  • 作者简介:郭力嘉,副主任医师,博士,E-mail:guolijia@mail.ccmu.edu.cn
  • 基金资助:
    国家重点研发计划(2022YFC2504200);国家自然科学基金(81600891);首都医科大学附属北京口腔医院创新团队建设项目(CXTD202202);首都医科大学附属北京口腔医院创新基金(21-09-18);首都医科大学附属北京口腔医院青年科技创新人才培育计划(YSP202105);中华口腔医学会青年临床科研基金(CSA-SIS2022-11);北京市医管局青年人才培养计划“青苗”计划(QML20181501);北京市医院管理局临床医学发展专项—“扬帆计划”(ZY-LX202121);北京市医院管理局“登峰”人才培养计划(DFL20-181501);北京市属医院科研培育计划(PX2023054)

Liver macrophages show an immunotolerance phenotype in nonalcoholic fatty liver combined with Porphyromonas gingivalis-lipopolysaccharide infection

Guo Lijia1(), Liu Yitong2, Chen Yingyi2, Xu Junji2, Liu Yi2()   

  1. 1.Dept. of Orthodontics, Beijing Stomatological Hospital, Capital Medical University, Beijing 100050, China
    2.Dept. of Periodontics, Beijing Stomatological Hospital, Capital Medical University, Beijing 100050, China
  • Received:2023-04-11 Revised:2023-05-01 Online:2023-08-01 Published:2023-07-21
  • Contact: Liu Yi E-mail:guolijia@mail.ccmu.edu.cn;lililiuyi@163.com
  • Supported by:
    National Key R&D Program of China(2022YFC2504200);National Nature Science Foundation of China(81600891);Innovation Research Team Project of Beijing Stomatological Hospital, Capital Medical University(CXTD202202);Innovation Foundation of Beijing Stomatological Hospital, Capital Medical University(21-09-18);Young Scientist Program of Beijing Stomatological Hospital, Capital Medical University(YSP202105);Young Clinical Research Fund of Chinese Stomatological Association(CSA-SIS2022-11);Beijing Municipal Administration of Hospitals’ Youth Programme(QML20181501);Beijing Municipal Administration of Hospitals Clinical Medicine Development of Special Funding Support(ZYLX202121);Beijing Municipal Administration of Hospitals’ Ascent Plan(DFL20181501);Beijing Municipal Administration of Hospitals Incubating Program(PX2023054);Correspondence: Liu Yi, E-mail: lililiuyi@163.com

摘要:

目的 探索牙龈卟啉单胞菌感染的非酒精性脂肪肝局部巨噬细胞功能变化及潜在调控靶点。 方法 利用单细胞测序技术分析合并牙龈卟啉单胞菌感染的非酒精性脂肪性肝炎(NASH)小鼠肝脏中的各类细胞表型及其功能变化。进一步利用实时荧光定量聚合酶链反应、酶联免疫吸附和免疫荧光染色观察肝脏组织中的炎症程度及巨噬细胞抗原呈递功能标志物表达水平,利用油红染色观察NASH肝脏局部脂肪组织堆积情况。体外利用牙龈卟啉单胞菌来源的脂多糖干预小鼠腹腔巨噬细胞,通过实时荧光定量聚合酶链反应和转录组测序验证体内试验结果。 结果 与健康肝脏中的巨噬细胞相比,牙龈卟啉单胞菌感染的NASH小鼠肝脏巨噬细胞表现出了显著的异质性,其高表达包括C1qb、C1qc、Mafb、Apoe和Cd14在内的多个炎症基因,但与抗原提呈功能相关的基因Cd209a、H2-Aa、H2-Ab1和H2-DMb1等的表达相对较低。进一步的体内外研究表明,这些巨噬细胞的活化和浸润可能是由于局部牙龈卟啉单胞菌来源的脂多糖的积累和诱导造成的。 结论 牙龈卟啉单胞菌来源的脂多糖诱导非酒精性脂肪肝的局部巨噬细胞免疫耐受表型,可能是牙周炎致病菌感染促进NASH炎症和发病的关键机制。本研究结果进一步阐明巨噬细胞在NASH相关疾病发病过程中的功能障碍和调节机制,并为其临床治疗提供了几个潜在的调控靶点。

关键词: 牙龈卟啉单胞菌, 非酒精性脂肪性肝炎, 巨噬细胞, 抗原呈递, 单细胞测序

Abstract:

Objective This study aimed to explore the functions and potential regulatory targets of local macrophages in nonalcoholic fatty liver combined with Porphyromonas gingivalis (P. gingivalis)infection. Methods Single-cell RNA sequencing was used to analyze the phenotypes and functional changes in various cells in the liver tissue of nonalcoholic steatohepatitis (NASH) mice fed with P. gingivalis. Real-time polymerase chain reaction (RT-PCR), enzyme-linked immunosorbent assay, and immunofluorescence staining were applied to observe the inflammation and expression levels of macrophage antigen presenting functional markers in the NASH liver. Oil red staining was performed to observe the accumulation of local adipose tissue in the NASH liver. Results were verified through RT-PCRand RNA sequencing using P. gingivalis-lipopolysaccharide treated mouse peritoneal macrophages. Results In comparison with healthy livers with Kupffer cells, the NASH liver combined with P. gingivalis infection-related macrophages showed significant heterogeneity. C1qb, C1qc, Mafb, Apoe, and Cd14 were highly expressed, but Cd209a, H2-Aa, H2-Ab1, and H2-DMb1, which are related to the antigen presentation function, were weakly expressed. Further in vivo and in vitro investigations indicated that the activation and infiltration of these macrophages may be due to local P. gingivalis-lipopolysaccharide accumulation. Conclusion P. gingivalis-lipopolysaccharide induces a local macrophage immunotolerance phenotype in nonalcoholic fatty liver, which may be the key mechanism of periodontitis pathogen infection that promotes NASH inflammation and pathogenesis. This study further clarifies the dysfunction and regulatory mechanisms of macrophages in the pathogenesis of P. gingivalis-infected NASH, thereby providing potential therapeutic targets for its clinical treatment.

Key words: Porphyromonas gingivalis, nonalcoholic steatohepatitis, macrophage, antigen presentation, single-cell RNA sequencing

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