摘要
目的 探讨信号传导及转录活化因子3(signal transducer and activator of transcription 3,STAT3)对肺泡上皮细胞表面活性物质相关蛋白(surfactant proteins,SP)表达的调控作用.方法 构建过表达STAT3的慢病毒并感染人肺泡上皮细胞A549细胞,构建过表达STAT3基因的A549细胞株;设计并化学合成STAT3的小干扰RNA(small interfering RNA,siRNA),在脂质体(Lipofectamine3000)的介导下转染A549细胞,构建沉默STAT3的A549细胞;采用Real-time PCR法分别检测STAT3过表达和沉默后STAT3、SP-A、SP-B、SP-C和SP-D mRNA的表达量,Western blot法检测STAT3、磷酸化STAT3(p-STAT3)、SP-A、SP-B、SP-C和SP-D蛋白的表达.结果 通过Real-time PCR和Western blot法检测STAT3的表达,结果证明成功构建了过表达/沉默STAT3的A549细胞株;与空载病毒组(LV5-Mock)相比,过表达STAT3组(LV5-STAT3)的SP-A、SP-B、SP-C、SP-D mRNA和蛋白的表达均上调(P<0.05);与阴性对照组(NC)及转染试剂对照组(Mock)相比,沉默STAT3组(siRNA) SP-A、SP-B、SP-C和SP-D mRNA和蛋白的表达均下调(P<0.05).结论 STAT3对肺表面活性物质相关蛋白的表达具有调控作用,过表达STAT3基因能够促进SP的表达,沉默STAT3基因抑制SP的表达.
Objective To investigate the role of signal transducer and activator of transcription 3 (STAT3) on the expression of surfactant proteins (SP) in alveolar epithelial cells line A549.Methods STAT3 overexpression lentivirus vector was constructed and transfected into A549 cells.Three small interfering RNAs (siRNA) were chemically synthesized and transfected into A549 cells by Lipofectamine 3000 to construct cells that silenced STAT3.The expression of STAT3,SP-A,SP-B,SP-C and SP-D were detected by Real-time PCR and Western blot.Results In A549 cells,over-or under-regulation of STAT3 were constructed successfully.When STAT3 was rendered over-expressed,the expression of SP-A,SP-B,SP-C,SP-D mRNA was significantly increased compared with Mock group(P < 0.05).The proteins were found to be significantly increased as well.By contrast,when STAT3 was under-expressed,SP was down-regulated (P < 0.05).Conclusion STAT3 regulates the expression of pulmonary surfactant proteins in A549 cells.Over-expression of the STAT3 gene promotes the expression of SP,and its under-expression inhibited it.
作者
贡永健
许卫东
陶慧娴
卢志涛
陈旸
周晓玉
周晓光
Gong Yongjian;Xu Weidong;Tao Huixian;Lu Zhitao;Chen Yang;Zhou Xiaoyu;Zhou Xiaoguang(Neonatal Medical Center,Children′s Hospital of Nanjing Medical University,Nanjing 210008,China)
出处
《国际儿科学杂志》
2018年第9期724-728,共5页
International Journal of Pediatrics
基金
国家自然科学基金项目(81571476、81741086)
江苏省自然科学基金项目(BK20141080)
江苏省张家港市科技支撑计划项目(ZKS1512).
