HLF细胞高氧暴露后miR-15b及miR-16上调并抑制VEGF表达

摘要

目的 探讨高氧暴露下人胚肺成纤维细胞(HLF)中miR-15b及miR-16对VEGF蛋白的调控作用.方法 用转染技术分别上调及下调HLF细胞miR-15b和miR-16水平;用Western blot技术检测细胞中VEGF蛋白;同时,用体外细胞培养方法,观察高氧暴露下HLF细胞miR-15b、miR-16及VEGF蛋白水平的影响.结果 上调miR-15b和miR-16可使HLF细胞中VEGF蛋白降低,反之可使其升高;高氧暴露可诱导HLF细胞miR-15b和miR-16上调,而VEGF表达则下降.结论 高氧暴露可诱导HLF细胞中miR-15b及miR-16上调并抑制VEGF的表达,可能参与支气管肺发育不良(BPD)的发生过程.%Objective To investigate the effect of miR-15b and miR-16 on the expression of vascular endothelial growth factor (VEGF) protein in human embryonic lung fibroblast (HLF) cells under hyperoxia.Methods The expression level of miR-15b and miR-16 was up-regulated and down-regulated in HLF cells by transfection technology, respectively.The expression of VEGF protein in HLF cells was assessed by Western blot.Furthermore, under hyperoxia exposure in vitro, the expression of miR-15b, miR-16 and VEGF protein in HLF cells was analyzed.Results Up-regulation of miR-15b and miR-16 suppressed VEGF protein expression, while down-regulated miR-15b and miR-16 promoted VEGF protein expression.In addition, hyperoxia exposure induced up-regulation of miR-15b and miR-16, but down-regulation of VEGF protein in HLF cells.Conclusions Hyperoxia exposure may up-regulate the expression level of miR-15b and miR-16, but suppress VEGF protein expression.These may contribute to the development of bronchopulmonary dysplasia.