[Study on the damage of the tight junctions of nasal mucosal epithelial cells by artemisia annua pollen]
- PMID: 32842360
- DOI: 10.3760/cma.j.cn115330-20191002-00612
[Study on the damage of the tight junctions of nasal mucosal epithelial cells by artemisia annua pollen]
Abstract
Objective: To investigate the damage and mechanism of artemisia annua pollen on tight junction of human nasal mucosa epithelial cells (HNEpC). Methods: HNEpC were cultured in vitro. Different concentrations of artemisia annua pollen (0, 20, 40, 80, 100, 160, 200 μg/ml) were used to intervene the cells for 24 h, and the cell proliferation activity was detected by the CCK-8 method. The expression and phosphorylation of p38MAPK signaling pathway were detected by Western Blot before and after the intervention of SB203580, a p38MAPK inhibitor in HNEpC. Immunofluorescence chemical staining, Western Blot and quantitative real-time PCR (qPCR) were used to observe the expression and distribution of tight junctions Occludin and Claudin-1. SPSS 21.1 software was used for statistical analysis. Results: CCK-8 results showed that, compared with the control group, the proliferation activity of HNEpC increased after 6 h intervention with different concentrations of artemisia annua pollen (all P<0.05). After 12 h of intervention, the proliferation activity of HNEpC in the 20, 40, 80, 100 and 160 μg/ml groups was not significantly changed (all P>0.05), while that in the 200 μg/ml group was decreased (P<0.05). After the intervention for 24 h, the proliferation activity of cells in the 20 and 40 μg/ml groups was not significantly changed (all P>0.05), while that in the 80, 100, 160 and 200 μg/ml groups was decreased (all P<0.05). Immunofluorescence staining showed that the Occludin and Claudin-1 proteins in the normal control group were localized on the cell membrane and expressed more and formed a ring structure around the cell membrane. However, under the intervention of high concentration artemisia annua pollen, its expression level decreased, appeared broken, fuzzy, and nonuniform distribution. Western Blot and qPCR results showed that after 24 h of intervention, the expression levels of HNEpC Claudin-1 protein and its mRNA in the pollen groups (40, 80, 100, 160, 200 μg/ml) of artemisia annua decreased compared with those of those of the control group (mRNA expression levels were 0.567±0.214, 0.443±0.109, 0.462±0.160, 0.497±0.134, 0.388±0.076 compared with 1.001±0.067, respectively, all P<0.05). However, the mRNA of Occludin protein and its mRNA only decreased in the 200 μg/ml treatment group (mRNA expression level was 0.631±0.109 compared with 1.016±0.026, P<0.05), while all the other treatment groups increased (mRNA expression levels were 1.258±0.134, 1.827±0.103, 2.429±0.077, 1.707±0.085, 1.477±0.066 compared with 1.016±0.026, respectively, all P<0.05). Western Blot showed that p-p38MAPK expression increased after intervention with 100, 160, 200 μg/ml artemisia annua pollen for 24 h. SB203580 could inhibit the decreasing expression of Occludin caused by artemisinin pollen (mRNA expression was 1.255±0.179 compared with 0.631±0.109, P<0.05), but had no effect on Claudin-1 protein expression. Conclusion: Pollen from artemisia annua may activate p38MAPK signaling pathway and destroy the close connection of HNEpC.
目的： 探讨黄花蒿花粉对鼻黏膜上皮细胞（HNEpC）紧密连接的损伤作用及机制。 方法： 体外培养HNEpC，采用不同质量浓度黄花蒿花粉（0、20、40、80、100、160、200 μg/ml）分别干预细胞24 h，CCK-8法检测细胞增殖活性；p38丝裂原素活化蛋白激酶（p38MAPK）抑制剂SB203580干预HNEpC前后，Western Blot法检测p38MAPK信号通路表达及其磷酸化水平；免疫荧光化学染色法、Western Blot法和实时荧光定量聚合酶链反应（qPCR）观察细胞紧密连接Occludin、Claudin-1的表达和分布情况。采用SPSS 21.0软件分析数据。 结果： CCK-8结果显示，与对照组相比，不同质量浓度黄花蒿花粉干预6 h后，HNEpC增殖活性均增高（P值均<0.05）；干预12 h后，20、40、80、100、160 μg/ml组的HNEpC增殖活性未见明显改变（P值均>0.05），200 μg/ml组降低（P<0.05）；干预24 h后，20、40 μg/ml组的细胞增殖活性未见明显改变（P值均>0.05），80、100、160、200 μg/ml组降低（P值均<0.05）。免疫荧光染色可见正常对照组Occludin和Claudin-1蛋白定位于细胞膜上，表达多，围绕细胞膜形成环状结构；而在高浓度黄花蒿花粉干预下，其表达水平下降，出现断裂、模糊，分布不均匀。Western Blot和qPCR实验结果表明，干预24 h后，黄花蒿花粉（40、80、100、160、200 μg/ml）干预组HNEpC Claudin-1蛋白及其mRNA表达水平较对照组降低（mRNA表达量分别为0.567±0.214、0.443±0.109、0.462±0.160、0.497±0.134、0.388±0.076比1.001±0.067，P值均<0.05），而Occludin蛋白及其mRNA仅在200 μg/ml黄花蒿花粉处理组降低（mRNA表达量为0.631±0.109比1.016±0.026，P<0.05），其他处理组均增高（mRNA表达量分别为1.258±0.134、1.827±0.1034、2.429±0.077、1.707±0.085、1.477±0.066比1.016±0.026，P值均<0.05）。Western Blot结果表明，100、160、200 μg/ml黄花蒿花粉干预24 h后，磷酸化p38MAPK（p-p38MAPK）表达增加。SB203580能够抑制黄花蒿花粉引起的紧密连接蛋白Occludin表达下降（mRNA表达量为1.255±0.179比0.631±0.109，P<0.05），而对Claudin-1蛋白表达无影响。 结论： 黄花蒿花粉可能通过激活p38MAPK信号通路，破坏HNEpC的紧密连接。.
Keywords: Connexins; Occludin; Rhinitis, allergic; p38 Mitogen-activated protein kinases.
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