活性氧簇/沉默信息调节因子1在高氧致支气管上皮细胞损伤中的作用  

Role of reactive oxygen species/silent information regulator 1 in hyperoxia-induced bronchial epithelial cell injury

作　　者：杨坤 吴越 章容 雷小平 康兰 董文斌 YANG Kun;WU Yue;ZHANG Rong;LEI Xiao-Ping;KANG Lan;DONG Wen-Bin(Department of Neonatology,Children's Medical Center,Affiliated Hospital of Southwest Medical University/Sichuan Clinical Research Center for Birth Defects,Luzhou,Sichuan 646000,China)

机构地区：[1]西南医科大学附属医院儿童医学中心新生儿科/四川省出生缺陷临床医学研究中心,四川泸州646000

出　　处：《中国当代儿科杂志》2024年第8期852-860,共9页Chinese Journal of Contemporary Pediatrics

基　　金：四川省科技计划重点研发项目(2022YFS0062)。

摘　　要：目的探讨活性氧簇(reactive oxygen species,ROS)/沉默信息调节因子1(silent information regulator 1,SIRT1)对高氧致BEAS-2B细胞线粒体损伤的影响。方法实验分为三部分:(1)细胞分为高氧0 h(H0)组、H6组、H12组、H24组、H48组。(2)细胞分为对照组、H48组、高氧48 h+SIRT1抑制剂(H48+EX 527)组和高氧48 h+SIRT1激动剂(H48+SRT1720)组。(3)细胞分为对照组、高氧48 h+乙酰半胱氨酸(H48+NAC)组和H48组。采用活性氧试剂盒检测ROS水平,Western blot法检测SIRT1和线粒体相关蛋白表达水平,免疫荧光染色法检测线粒体相关蛋白表达,透射电镜检测线粒体形态。结果(1)与H0组相比,H6组、H12组、H24组和H48组ROS荧光强度增加(P<0.05),H48组SIRT1和线粒体相关蛋白表达水平降低(P<0.05),H24组和H48组线粒体相关蛋白荧光强度降低(P<0.05)。(2)与H48组相比,H48+SRT1720组线粒体相关蛋白表达水平升高,线粒体平均长宽比增加(P<0.05);H48+EX 527组线粒体平均面积减少(P<0.05)。(3)与H48组相比,H48+NAC组ROS荧光强度降低,SIRT1和线粒体相关蛋白表达水平升高,线粒体平均面积和平均长宽比增加(P<0.05)。结论ROS/SIRT1轴参与了高氧诱导的BEAS-2B细胞线粒体损伤。Objective To investigate the effect of reactive oxygen species(ROS)/silent information regulator 1(SIRT1)on hyperoxia-induced mitochondrial injury in BEAS-2B cells.Methods The experiment was divided into three parts.In the first part,cells were divided into H0,H6,H12,H24,and H48 groups.In the second part,cells were divided into control group,H48 group,H48 hyperoxia+SIRT1 inhibitor group(H48+EX 527 group),and H48 hyperoxia+SIRT1 agonist group(H48+SRT1720 group).In the third part,cells were divided into control group,48-hour hyperoxia+N-acetylcysteine group(H48+NAC group),and H48 group.The ROS kit was used to measure the level of ROS.Western blot and immunofluorescent staining were used to measure the expression levels of SIRT1 and mitochondria-related proteins.Transmission electron microscopy was used to observe the morphology of mitochondria.Results Compared with the H0 group,the H6,H12,H24,and H48 groups had a significantly increased fluorescence intensity of ROS(P<0.05),the H48 group had significant reductions in the expression levels of SIRT1 protein and mitochondria-related proteins(P<0.05),and the H24 and H48 groups had a significant reduction in the fluorescence intensity of mitochondria-related proteins(P<0.05).Compared with the H48 group,the H48+SRT1720 group had significant increases in the expression levels of mitochondria-related proteins and the mitochondrial aspect ratio(P<0.05),and the H48+EX 527 group had a significant reduction in the mitochondrial area(P<0.05).Compared with the H48 group,the H48+NAC group had a significantly decreased fluorescence intensity of ROS(P<0.05)and significantly increased levels of SIRT1 protein,mitochondria-related proteins,mitochondrial area,and mitochondrial aspect ratio(P<0.05).Conclusions The ROS/SIRT1 axis is involved in hyperoxia-induced mitochondrial injury in BEAS-2B cells.

关 键 词：线粒体损伤 高氧 活性氧簇 沉默信息调节因子1 人支气管上皮细胞 

分 类 号：R722.1[医药卫生—儿科]