中国实用口腔科杂志

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牙龈卟啉单胞菌感染对人主动脉内皮细胞炎症反应的影响研究

潘盛波1闫福华2   

  1. 1. 厦门医学院附属口腔医院牙周科,福建  厦门 361016;2. 南京大学医学院附属口腔医院,南京市口腔医院,江苏 南京  210008
  • 出版日期:2019-05-15 发布日期:2019-05-15
  • 基金资助:

    福建省科技计划引导性项目(2016D006);江苏省科教强卫工程医学创新团队(CXTDB2017014)

  • Online:2019-05-15 Published:2019-05-15

摘要:

目的 研究牙龈卟啉单胞菌(Porphyromonas gingivalis,P.gingivalis)感染对人主动脉内皮细胞(human aortic endothelial cells,HAECs)表达炎症因子的影响并探讨其可能的分子机制。方法 在体外以感染复数(multiplicity of infection,MOI)分别为0、25∶1、100∶1和200:1的P.gingivalis刺激HAECs 24 h后,分别采用实时荧光定量PCR、酶联免疫吸附试验和免疫印迹试验检测单核细胞趋化因子-1(monocyte chemotactic protein 1,MCP-1)、白细胞介素-1β(interleukin 1β,IL-1β)、Toll样受体(Toll like receptor,TLR)-2和TLR-4的表达水平;在体外以MOI分别为0和200∶1的P.gingivalis刺激HAECs 30 min后,采用凝胶迁移实验检测核因子κB(nuclear factor κB,NF-κB)的活化水平。结果 P.gingivalis刺激组(MOI分别为25∶1、100∶1和200∶1)的HAECs中MCP-1、IL-1β、TLR-2和TLR-4的表达均显著高于未刺激组(MOI为0)(均P < 0.05),且提示这种上调作用呈P.gingivalis刺激剂量依赖性;P.gingivalis刺激组(MOI为200∶1)的HAECs中NF-κB活化水平显著高于未刺激组(MOI为0)(P < 0.05)。结论 P.gingivalis可能通过TLRs-NF-κB信号通路上调HAECs中炎症因子的表达,导致血管内皮功能紊乱,提示P. gingivalis可能促进动脉粥样硬化的发生和发展。

关键词: 牙龈卟啉单胞菌, 人主动脉内皮细胞, 炎症反应, 核因子&kappa, B

Abstract:

Objective To investigate the effects of Porphyromonas gingivalis(P.gingivalis)infection on the expression of inflammatory factors in human aortic endothelial cells(HAECs)and explore its possible molecular mechanism. Methods HAECs were challenged in vitro by P.gingivalis with MOI of 0,25∶1,100∶1 and 200∶1 respectively,and after 24 hours the expression of monocyte chemotactic protein 1(MCP-1),interleukin 1β(IL-1β),Toll like receptors(TLR)-2 and TLR-4 was detected by real time quantitative PCR,enzyme linked immunosorbent assay and Western Blot. HAECs were challenged by P.gingivalis with MOI of 0 and 200∶1 respectively in vitro,and after 30 minutes the activation of nuclear factor κB(NF-κB)was detected by electrophoretic mobility shift assay. Results The expressions of MCP-1,IL-1β,TLR-2 and TLR-4 in HAECs were significantly increased in P.gingivalis-challenged groups (MOI = 25∶1,100∶1 and 200∶1 respectively)than those in non-challenged group(MOI = 0) (P < 0.05),and the up-regulation was dose-dependent;the activation of NF-κB in HAECs of P.gingivalis-challenged group(MOI = 200∶1)was significantly increased than that of non-challenged group(MOI = 0)(P < 0.05). Conclusion P.gingivalis up-regulates the expression of inflammatory cytokines in HAECs,which leads to its dysfunction,suggesting that P.gingivalis could play a significant role in promoting the initiation and development of atherosclerosis.

Key words: Porphyromonas gingivalis;human aortic endothelial cells;inflammatory response;nuclear factor &kappa, B