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1.宁夏医科大学总医院重症医学科,银川 750004
2.沧州市人民医院呼吸内科,沧州 061000
白吉佳,Email:15209605572@163.com,研究方向:重症感染。
马希刚,Email:nyfyicu@163.com。
收稿:2023-05-05,
修回:2023-06-29,
录用:2023-07-16,
纸质出版:2024-02-28
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白吉佳,石国翠,马申懋,等.TNF-α下调大鼠肺微血管内皮细胞紧密连接蛋白ZO-1、Claudin-5的表达[J].重庆医科大学学报,2024,49(2):125-131.
Bai Jijia,Shi Guocui,Ma Shenmao,et al.TNF-α downregulates the expression of tight junction proteins ZO-1 and Claudin-5 in rat pulmonary microvascular endothelial cells[J].Journal of Chongqing Medical University,2024,49(2):125-131.
白吉佳,石国翠,马申懋,等.TNF-α下调大鼠肺微血管内皮细胞紧密连接蛋白ZO-1、Claudin-5的表达[J].重庆医科大学学报,2024,49(2):125-131. DOI: 10.13406/j.cnki.cyxb.003423.
Bai Jijia,Shi Guocui,Ma Shenmao,et al.TNF-α downregulates the expression of tight junction proteins ZO-1 and Claudin-5 in rat pulmonary microvascular endothelial cells[J].Journal of Chongqing Medical University,2024,49(2):125-131. DOI: 10.13406/j.cnki.cyxb.003423.
目的
2
研究肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)对大鼠肺微血管内皮细胞紧密连接蛋白1(zonula occludens-1,ZO-1)、Claudin-5表达的影响,探讨TNF-α对大鼠肺血管屏障的损伤机制。
方法
2
将体外培养的大鼠肺微血管内皮细胞分为对照组、TNF-α 24 h、48 h和72 h组(TNF-α 10 mg/L)。透射电镜观察大鼠肺微血管内皮细胞超微结构。MTT法及流式细胞仪分别测定各组细胞的增殖抑制率及凋亡率。免疫荧光法测定ZO-1及Claudin-5的分布。RT-qPCR及Western blot测定各组细胞ZO-1及Claudin-5的mRNA及蛋白表达。
结果
2
对照组内皮细胞含有大量的线粒体及内质网等结构,结构正常。TNF-α各组细胞线粒体数量减少,线粒体肿胀,嵴溶解,核固缩,凋亡细胞增多,细胞增殖抑制率及凋亡率较对照组增加(均
P
<
0.05),呈时间依赖性。ZO-1及Claudin-5呈线状荧光分布于内皮细胞间连接部位。与对照组比较,TNF-α各组细胞ZO-1的转录及表达水平均降低(均
P
<
0.05)。TNF-α各组Claudin-5的转录水平较对照组明显降低(均
P
<
0.05),TNF-α 48 h、72 h组Claudin-5的蛋白表达水平较对照组降低(均
P
<
0.05),TNF-α 24 h组与对照组比较差异无
统计学意义(
P
>
0.05)。
结论
2
TNF-α下调大鼠微血管内皮细胞ZO-1及Claudin-5的表达,诱导细胞损伤及凋亡,破坏肺屏障,导致肺损伤。
Objective
2
To investigate the effect of tumor necrosis factor-α(TNF-α) on the expression of tight junction proteins ZO-1 and Claudin-5 in rat pulmonary microvascular endothelial cells and to explore the injury mechanism of TNF-α on pulmonary vascular barrier in rats.
Methods
2
Rat pulmonary microvascular endothelial cells cultured
in vitro
were divided into control group,and TNF-α 24 h,48 h,and 72 h groups(TNF-α 10 mg/L). The ultrastructure of rat pulmonary microvascular endothelial cells was observed by a transmission electron microscope. The proliferation inhibition rate and apoptosis rate of cells in each group were determined by MTT assay and flow cytometry. The distribution of ZO-1 and Claudin-5 was determined by the immunofluorescence method. The mRNA and protein expression levels of ZO-1 and Claudin-5 in cells of each group were determined by real-time fluorescence quantitative polymerase chain reaction and Western blot.
Results
2
Endothelial cells in the control group contained a large number of mitochondria and endoplasmic reticulum,with a normal structure. Cells in the TNF-α groups showed a decrease in the number of mitochondria,mitochondrial swelling,cristae lysis,karyopyknosis,and an increase in apoptotic cells,with a significant time-dependent increase in the proliferation inhibition rate and apoptosis rate compared with the control group(all
P
<
0.05). ZO-1 and Claudin-5 were distributed at the junction of endothelial cells,showing linear fluorescence. Compared with the control group,the TNF-α groups showed a significant decrease in the transcription and expression levels of ZO-1 and the transcription level of Claudin-5(
P
<
0.05); the TNF-α 48 h and 72 h groups showed a
significant decrease in the protein expression level of Claudin-5(
P
<
0.05); the TNF-α 24 h group showed no significant difference(
P
>
0.05).
Conclusion
2
TNF-α downregulates the expression of ZO-1 and Claudin-5 in rat pulmonary microvascular endothelial cells,induces cell injury and apoptosis,destroys the lung barrier,and leads to lung injury.
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