口腔医学研究 ›› 2020, Vol. 36 ›› Issue (4): 377-381.DOI: 10.13701/j.cnki.kqyxyj.2020.04.017

• 牙周病学与黏膜病学研究 • 上一篇    下一篇

N-乙酰半胱氨酸对脂多糖诱导的血管内皮细胞炎症损伤的影响

张贞祯, 熊婷, 郑睿, 黄佳琳, 郭玲*   

  1. 西南医科大学附属口腔医院修复科 四川 泸州 646000
  • 收稿日期:2019-07-01 出版日期:2020-05-28 发布日期:2020-05-28
  • 通讯作者: 郭玲,E-mail:2005202@foxmail.com
  • 作者简介:张贞祯(1994~ ),女,四川广安人,硕士在读,主要从事口腔种植修复的研究工作。
  • 基金资助:
    四川省科技厅面上项目(编号:2017JY0111); 西南医科大学重点项目(编号:2016013)

Effect of N-acetylcysteine on Inflammatory Injury Induced by Lipopolysaccharide in Vascular Endothelial Cells

ZHANG Zhenzhen, XIONG Ting, ZHENG Rui, HUANG Jialin, GUO Ling*   

  1. Department of Prosthodontics, Hospital of Stomatology,Southwest Medical University,Luzhou 646000,China
  • Received:2019-07-01 Online:2020-05-28 Published:2020-05-28

摘要: 目的: 探讨N-乙酰半胱氨酸(NAC)是否对脂多糖(LPS)刺激的血管内皮细胞具有保护作用,为NAC用于治疗种植体周围炎、牙周炎等提供理论基础。方法: 通过细胞计数试剂盒(CCK-8)法检测不同浓度的LPS或NAC对人脐静脉血管内皮细胞(HUVECs)增殖的影响,以获得刺激HUVECs的最适药物浓度。添加最佳药物浓度的LPS和(或)NAC处理HUVECs 24 h,实时半定量聚合酶链反应(RT-qPCR)检测炎症因子白细胞介素-8(IL-8)、肿瘤坏死因子-α(TNF-α)和细胞粘附分子-1(ICAM-1)的mRNA表达;酶联免疫吸附试验(ELISA)检测TNF-α和IL-8的蛋白表达;Western blot法检测ICAM-1和NF-κB信号通路的表达情况。结果: LPS刺激HUVECs过量表达炎症因子TNF-α、IL-8和ICAM-1。此外,LPS增加NF-κB通路的磷酸化P65(pP65)表达。然而,NAC预处理HUVECs后,显著抑制了LPS引起的TNF-α、IL-8和ICAM-1表达的增加及降低了pP65的分泌水平。结论: 本结果表明NAC 保护血管内皮细胞免受LPS介导的炎症损伤,从而减轻炎症反应,其潜在的机制可能与NF-κB信号通路有关。

关键词: 血管内皮细胞, N-乙酰半胱氨酸, 脂多糖, 炎症反应, NF-κB信号通路

Abstract: Objective: To investigate whether N-acetylcysteine (NAC) has protective effects on lipopolysaccharide (LPS)-stimulated vascular endothelial cells, and provide a theoretical basis for the treatment of peri-implantitis and periodontitis. Methods: The effects of different concentrations of LPS or NAC on proliferation of human umbilical vein endothelial cells (HUVECs) were measured by cell counting kit 8 (CCK-8) to obtain the optimal drug concentration for stimulation of HUVECs. After adding the optimal drug concentration of LPS and/or NAC to treat HUVECs for 24 h, real-time semi-quantitative polymerase chain reaction (RT-qPCR) was used to detect the mRNA expression of inflammatory factors interleukin-8 (IL-8), tumor necrosis factor-α (TNF-α), and cell adhesion molecule 1 (ICAM-1). Protein expression of TNF-α and IL-8 were detected by enzyme-linked immunosorbent assay (ELISA). The protein expressions of ICAM-1 and NF-κB signaling pathway were detected by western blot. Results: LPS stimulated HUVECs to overexpress inflammatory factors TNF-α, IL-8, and ICAM-1. In addition, LPS increased phosphorylation of P65 (pP65) expression in the NF-κB pathway. However, NAC pretreatment of HUVECs significantly inhibited the increase of TNF-α, IL-8, and ICAM-1 expression induced by LPS and decreased the secretion level of pP65. Conclusion: NAC protects HUVECs against LPS-mediated inflammatory reaction and alleviates inflammation. The underlying mechanism is related to the NF-κB pathway.

Key words: vascular endothelial cells, N-acetylcysteine, lipopolysaccharide, inflammatory response, NF-κB signaling pathway