These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: [Expression of triggering receptors expressed by myeloid cells-1 in macrophages stimulated by Porphyromonas gingivalis-lipopolysaccharide].
    Author: Yang Y, Chen SS, Xu CM, Wu YF, Zhao L.
    Journal: Hua Xi Kou Qiang Yi Xue Za Zhi; 2018 Oct 01; 36(5):475-481. PubMed ID: 30465338.
    Abstract:
    OBJECTIVE: Soluble triggering receptors expressed by myeloid cells-1 (sTREM-1) and inflammatory cytokine tumor necrosis factor-α (TNF-α) in macrophage cells were stimulated by Porphyromonas gingivalis-lipopolysaccharide (Pg-LPS) to investigate the expression of triggering receptors expressed by myeloid cells-1 (TREM-1) and further explore the correlation between TREM-1 and the pathogenesis of periodontitis. METHODS: THP-1 cells (a human monocytic cell line derived from an acute monocytic leukemia patient) were induced to differentiate THP-1 macrophages by phorbol-12-myristate-13-acetate and were injected with 0 (blank control), 0.5, or 1.0 μg·mL⁻¹ Pg-LPS. The THP-1 cells were then grouped in accordance with incubation time, and each group was incubated for 4, 6, 12, or 24 h. The expression of the TREM-1 mRNA in macrophages was detected by real-time quantitative polymerase chain reaction, while the expression of TREM-1 protein was detected by Western blot; the site where TREM-1 protein expression was observed in macrophages was detected by immunofluorescence staining, and the expression of soluble sTREM-1 and TNF-α in cell culture medium was detected by enzyme-linked immunosorbent assay. RESULTS: Compared with the blank control group, the expression of TREM-1 mRNA, TREM-1 protein, and sTREM-1 in Pg-LPS-stimulated macrophages was significantly upregulated (P<0.05). The expression of TREM-1 mRNA, TREM-1 protein, and sTREM-1 in the supernatant of cell culture was higher in the 1.0 μg·mL⁻¹ Pg-LPS group than in the 0.5 μg·mL⁻¹ group; this expression was statistically significant since the 6, 4, and 4 h time point (P<0.05). Cell immunofluorescence staining showed that TREM-1 protein was positive when the THP-1 macrophages was stimulated by Pg-LPS (1.0 μg·mL⁻¹) for 24 h, and the staining sites of TREM-1 were mainly located in the cell membrane of the macrophages (P<0.05). The expression level of TNF-α increased in groups stimulated by Pg-LPS, and the expression level of TNF-α was significantly higher in 1.0 μg·mL⁻¹ Pg-LPS stimulated groups than in 0.5 μg·mL⁻¹ Pg-LPS-stimulated groups since the 6 h time point (P<0.05). The expressions of TREM-1 mRNA, TREM-1 protein, and sTREM-1 in 0.5 μg·mL⁻¹ Pg-LPS-stimulated macrophages were positively correlated with one another (r=1, P<0.05), but no statistically significant correlation was found in the expression of TNF-α. The positive correlation between sTREM-1 and TNF-α expressions was detected when macrophages were stimulated by 1.0 μg·mL⁻¹ Pg-LPS (r=1, P<0.05). CONCLUSIONS: The expression of TREM-1 mRNA, TREM-1 protein, and sTREM-1 in the culture supernatant in Pg-LPS-stimulated macrophages was significantly upregulated on the basis of the concentration of Pg-LPS; moreover, their upregulation was positively correlated with one another. The expression of TNF-α in the supernatant of cell culture was also upregulated and was positively correlated with the expression of sTREM-1 at the group of high Pg-LPS concentration (1.0 μg·mL⁻¹). Results reveal that TREM-1, which has been realized as a proinflammatory receptor protein, can promote the development of periodontitis by regulating the expression of TNF-α in macrophages. 目的 探索牙龈卟啉单胞菌脂多糖（Pg-LPS）刺激的巨噬细胞中髓样细胞触发受体-1（TREM-1）、可溶性TREM-1（sTREM-1）及肿瘤坏死因子-α（TNF-α）的表达，探讨TREM-1与牙周炎发病机制的可能关联。方法 使用豆蔻酰佛波醇乙酯诱导人单核细胞系细胞THP-1分化为巨噬细胞，分别予以0（空白对照）、0.5、1.0 μg·mL⁻¹的Pg-LPS刺激，并根据不同时间分组：孵育4、6、12、24 h组。实时定量聚合酶链反应检测巨噬细胞中TREM-1 mRNA的表达，Western blot分析TREM-1蛋白表达的差异，细胞免疫荧光染色检测TREM-1在巨噬细胞中的表达部位，并通过酶联免疫吸附试验对细胞培养液中的sTREM-1及TNF-α进行检测。结果 与空白对照组相比，Pg-LPS刺激巨噬细胞后TREM-1 mRNA、TREM-1蛋白及细胞培养上清液中的sTREM-1表达均显著增强（P<0.05）；1.0 μg·mL⁻¹ Pg-LPS组TREM-1 mRNA、TREM-1蛋白及细胞培养上清液中的sTREM-1表达量高于0.5 μg·mL⁻¹组，且分别从6、4、4 h时间点开始差异具有统计学意义（P<0.05）；细胞免疫荧光染色结果显示，Pg-LPS（1.0 μg·mL⁻¹）刺激巨噬细胞24 h后，可见TREM-1蛋白呈阳性染色，且TREM-1的染色部位主要位于巨噬细胞的细胞膜区域；Pg-LPS刺激巨噬细胞后TNF-α的分泌水平升高（P<0.05），其中1.0 μg·mL⁻¹ Pg-LPS组表达量高于0.5 μg·mL⁻¹组，且从12 h开始差异具有统计学意义（P<0.05）；0.5 μg·mL⁻¹ Pg-LPS刺激巨噬细胞后TREM-1 mRNA、TREM-1蛋白、sTREM-1间表达呈正相关（r=1，P<0.05），但与TNF-α表达不存在相关性；在1.0 μg·mL⁻¹ Pg-LPS刺激巨噬细胞后检测到了具有统计学意义的sTREM-1与TNF-α表达的正相关性（r=1，P<0.05）。结论 巨噬细胞受到Pg-LPS刺激后可出现Pg-LPS浓度依赖性的TREM-1 mRNA、TREM-1蛋白及细胞培养上清液中的sTREM-1表达上调，且能观测到三者之间表达的正相关性；同时细胞培养上清液中的TNF-α也出现Pg-LPS浓度依赖性的表达上调，在高浓度Pg-LPS（1.0 μg·mL⁻¹）刺激下与sTREM-1表达量呈正相关。该结果提示，TREM-1作为促炎受体蛋白，可能通过调节巨噬细胞TNF-α的表达来实现牙周炎发展的促进作用。.
    [Abstract] [Full Text] [Related] [New Search]