摘要
目的探讨低氧诱导因子2α(HIF-2α)基因调控叉头框M1蛋白质(FoxM1)蛋白表达对低氧大鼠肺动脉平滑肌细胞(PASMC)增殖的影响。方法构建HIF-2α过表达慢病毒载体(LV-HIF-2α)和沉默RNA(siRNA),并分别在常氧和低氧条件下转染大鼠PASMC,其中常氧组分成常氧对照组、常氧+LV-HIF-2α空载组、常氧+LV-HIF-2α组;低氧组分成低氧对照组、低氧+siRNA-HIF-2α空载组、低氧+siRNA-HIF-2α组,采用Western印迹检测HIF-2α及其对下游FoxM1蛋白、细胞周期蛋白D1(cyclinD1)及细胞增殖相关AuroraA蛋白表达影响。5-乙炔基-2′-脱氧尿苷(EdU)细胞增殖检测过表达和抑制HIF-2α表达对大鼠PASMC增殖能力的影响。结果常氧+LV-HIF-2α组HIF-2α表达均显著高于常氧对照组和常氧+LV-HIF-2α空载组(0.17±0.02比0.09±0.01和0.07±0.00),而低氧+siRNA-HIF-2α组PASMC中HIF-2α表达均显著低于低氧对照组和低氧+siRNA-HIF-2α空载组(0.28±0.01比0.35±0.02和0.30±0.01)(均P<0.05);常氧+LV-HIF-2α组FoxM1蛋白、cyclinD1及细胞增殖相关AuroraA蛋白表达均显著高于常氧对照组和常氧+LV-HIF-2α空载组(分别为0.40±0.03比0.24±0.01和0.30±0.01,0.22±0.02比0.09±0.01和0.08±0.02,0.29±0.02比0.04±0.01和0.07±0.01)(均P<0.05);低氧+siRNA-HIF-2α组FoxM1蛋白、cyclinD1及AuroraA蛋白表达均显著低于低氧对照组和低氧+siRNA-HIF-2α空载组(分别为0.23±0.01比0.36±0.02和0.32±0.01,0.15±0.01比0.31±0.01和0.28±0.03,0.14±0.02比0.33±0.03和0.27±0.02)(均P<0.05);常氧对照组PASMC的EdU阳性表达率显著低于常氧+LV-HIF-2α组[(30.77±2.43)%比(55.56±3.01)%],而低氧对照组显著高于低氧+siRNA-HIF-2α组[(65.28±3.21)%比(44.64±2.78)%](均P<0.05)。结论HIF-2α调控FoxM1表达明显增加而促进低氧大鼠肺动脉平滑肌细胞增殖。
Objective To investigate the effect of hypoxia-inducible factor 2α (HIF-2α) gene on the expression of Forkhead box M1 (FoxM1) protein in the proliferation of hypoxic rat pulmonary artery smooth muscle cells (PASMC). Methods HIF-2α overexpression lentiviral vector (LV-HIF-2α) and silencing RNA (siRNA) were constructed and transfected into rat PASMC under normoxia and hypoxia, respectively. The PASMC under normoxia were classified into normoxic control group, normoxia + LV-HIF-2α empty group, normoxia + LV-HIF-2α group;the PASMC under hypoxia were classified into hypoxic control group, hypoxia + siRNA-HIF-2α empty group, hypoxia + siRNA-HIF-2α group. The expression of HIF-2α and its downstream proteins FoxM1, cyclin D1 and Aurora A expressions were detected by Western blot. 5-Ethyny-2′-deoxyuridine (EdU) cell proliferation assay was used to evaluate the effect of overexpression and inhibition of HIF-2α expression on the proliferation of rat PASMC. Results The expression of HIF-2α in normoxia + LV-HIF-2α group was significantly higher than that in normoxic control group and normoxia+LV-HIF-2α empty group (0.17±0.02 vs 0.09±0.01 and 0.07±0.00), while the expression of HIF-2α in PASMC of hypoxia + siRNA-HIF-2α group was significantly lower than that of hypoxic control group and hypoxia + siRNA-HIF-2α empty group (0.28±0.01 vs 0.35±0.02 and 0.30±0.01) (all P<0.05);the expression of FoxM1 protein, cyclinD1 and cell proliferation-related Aurora A protein in normoxia+LV-HIF-2α group were significantly higher than that in normoxic control group and normoxia+LV-HIF-2α empty group (0.40±0.03 vs 0.24±0.01 and 0.30±0.01, 0.22±0.02 vs 0.09±0.01 and 0.08±0.02, 0.29±0.02 vs 0.04±0.01 and 0.07±0.01, respectively) (all P<0.05);the expressions of FoxM1 protein, cyclinD1 and Aurora A protein in hypoxia + siRNA-HIF-2α group were significantly lower than those in hypoxic control group and hypoxia + siRNA-HIF-2α empty group (0.23±0.01 vs 0.36±0.02 and 0.32±0.01, 0.15±0.01 vs 0.31±0.01 and 0.28±0.03, 0.14±0.02 vs 0.33±0.03 and 0.27±0.02, respectively) (all P<0.05);the positive expression rate of EdU in the normoxic control group was significantly lower than that in the normoxia+LV-HIF-2α group [(30.77±2.43)% vs (55.56±3.01)%], while the hypoxic control group was significantly higher than the hypoxic+siRNA-HIF-2α group [(65.28±3.21)% vs (44.64±2.78)%] (both P<0.05). Conclusion HIF-2α up-regulates the expression of FoxM1 and promotes the proliferation of pulmonary artery smooth muscle cells in hypoxic rats.
作者
朱昊
朱黎明
蒋永亮
胡瑞成
戴爱国
Zhu Hao;Zhu Liming;Jiang Yongliang;Hu Ruicheng;Dai Aiguo(Department of Respiratory Medicine, Hunan Provincial People′s Hospital (First Affiliated Hospital of Hunan Normal University), Changsha 410016, China;Institute of Respiratory Diseases, Changsha Medical University, Changsha 410219, China)
出处
《中华医学杂志》
CAS
CSCD
北大核心
2019年第2期129-134,共6页
National Medical Journal of China
基金
国家自然科学基金(81270118)
湖南省医药卫生科研项目(B2013-063).
关键词
低氧诱导因子2α
叉头框M1蛋白质
肺动脉平滑肌细胞
细胞低氧
细胞增殖
Hypoxia-inducible Factor 2α
Forkhead box M1 protein
Pulmonary artery smooth muscle cells
Cell hypoxia
Cell proliferation
