AIM: To investigate the effect of venous marker chicken ovalbumin upstream promoter-transcription factor Ⅱ (COUP-TFⅡ) expression on vascular endothelial cell senescence and its molecular mechanism.METHODS: The mRNA expression of COUP-TFⅡ in the human coronary artery endothelial cells (HCAEC) and human umbilical vein endothelial cells (HUVEC) was detected by RT-qPCR.After transfection with a COUP-TFⅡ siRNA (siCOUP-TFⅡ) to inhibit COUP-TFⅡ expression in the HUVEC, the senescence and proliferation of endothelial cells were evaluated by β-galactosidase staining, Western blot, CCK-8 assay and cell counting after treatment with 10-5 mol/L angiotensin Ⅱ (AngⅡ).The protein levels of Akt and p-Akt were determined by Western blot.RESULTS: Compared with the HCAEC, COUP-TFⅡ was significantly highly expressed in the HUVEC.Knockdown of COUP-TFⅡ via siCOUP-TFⅡ significantly induced endothelial cell senescence and inhibited endothelial cell proliferation and p-Akt level after treatment with AngⅡ at 10-5 mol/L.Furthermore, an Akt activator SC79 at 4 mg/L partly reversed the effect of siCOUP-TFⅡ on AngⅡ-induced endothelial cell senescence and proliferation.CONCLUSION: Knockdown of COUP-TFⅡ promotes endothelial cell senescence and inhibits endothelial cell proliferation, which might be partly regulated by Akt signaling.%目的: 观察静脉表型分子鸡卵清蛋白上游启动子转录因子Ⅱ(COUP-TFⅡ)表达对血管内皮细胞衰老的影响和分子机制.方法: 通过RT-qPCR检测比较人冠状动脉内皮细胞(HCAEC)和人脐静脉内皮细胞(HUVEC)中COUP-TFⅡ的表达情况.使用10-5 mol/L血管紧张素Ⅱ(AngⅡ)诱导HUVEC衰老,通过COUP-TFⅡ特异性小干扰RNA(siCOUP-TFⅡ)转染HUVEC使其COUP-TFⅡ的表达降低,利用β-半乳糖苷酶染色、Western blot、CCK-8、细胞计数等方法分别观察siCOUP-TFⅡ对AngⅡ诱导的血管内皮细胞衰老及增殖的影响,通过Western blot检测Akt信号分子的表达变化.结果: 与HCAEC相比,HUVEC中COUP-TFⅡ呈显著高表达;用siCOUP-TFⅡ抑制HUVEC的COUP-TFⅡ表达时,能显著促进AngⅡ诱导的内皮细胞衰老并抑制内皮细胞增殖和p-Akt蛋白水平;加入Akt激动剂SC79 (4 mg/L)能够部分逆转siCOUP-TFⅡ对AngⅡ诱导的HUVEC衰老和增殖的影响.结论: COUP-TFⅡ表达降低可促进血管内皮细胞衰老并抑制内皮细胞增殖,其机制可能与调节Akt信号有关.
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