摘要目的:观察聚嘧啶束结合蛋白相关剪切子（PSF）高表达对低浓度4-羟基壬烯醛（4-HNE）诱导下人视网膜微血管内皮细胞（HRMECs）的影响，初步探讨其可能存在的机制。方法:将体外培养的对数生长期HRMECs分为4-HNE处理组、PSF高表达联合4-HNE组（PSF+4-HNE组）、PSF高表达+核因子E2相关因子2（Nrf2）抑制剂（ML385）联合4-HNE组（PSF+ML385+4-HNE组）、磷酸肌醇3激酶抑制剂LY294002预处理后4-HNE联合PSF组（LY294002+4-HNE+PSF组）。4-HNE处理组、PSF+4-HNE组、PSF+ML385+4-HNE组细胞培养基加入10 μmmol/L 4-HNE刺激12 h，PSF+4-HNE组、PSF+ML385+4-HNE组应用转染试剂脂质体2000将1.0 μg pcDNA-PSF真核表达质粒导入细胞中转染24 h后，PSF+ ML385+ 4-HNE组加入ML385（5 μmol/L）预处理48 h。LY294002+4-HNE+PSF组，除采用LY294002预处理外，4-HNE浓度、刺激时间以及质粒转染时间同前。Transwell检测PSF对HRMECs迁移能力的影响；Matrigel体外三维成型法检测PSF对HRMECs管腔形成的影响；流式细胞仪检测PSF对HRMECs中活性氧（ROS）水平的影响；蛋白质免疫印迹法（Western blot）检测PSF、Nrf2、血红素加氧酶-1（HO-1）蛋白相对表达量以及磷酸化丝氨酸-苏氨酸蛋白激酶（pAkt）蛋白相对表达量。两组间比较采用 t检验。 结果:4-HNE处理组、PSF+4-HNE组细胞数、迁移细胞数、完整管腔形成数分别为（1.70±0.06）、（0.80±0.13）个，（24.00±0.58）、（10.00±0.67）个和（725.00±5.77）、（318.70±12.13）个。两组细胞数、迁移细胞数、完整管腔形成数比较，差异均有统计学意义（ t=12.311、15.643、17.346， P<0.001）。流式细胞仪检测结果显示，4-HNE处理组、PSF+4-HNE组、PSF+ML385+4-HNE组ROS水平分别为816.70±16.67、416.70±15.44、783.30±17.41；组间两两比较，差异均有统计学意义（ t=16.311、14.833、18.442， P<0.001）。Western blot检测结果显示，4-HNE处理组、PSF+4-HNE组、LY294002+4-HNE+PSF组HRMECs中pAkt、Nrf2、HO-1蛋白相对表达量分别为0.08±0.01、0.57±0.04、0.35±0.09，0.17±0.03、1.10±0.06、0.08±0.11，0.80±0.14、2.50±0.07、0.50±0.05。与PSF+4-HNE组比较，LY294002+4-HNE+PSF组pAkt、Nrf2、HO-1蛋白相对表达量显著下降，差异均有统计学意义（ t=17.342、16.813、18.794， P<0.001）。 结论:PSF高表达通过活化磷酸肌醇3激酶/Akt通路上调HO-1的表达，从而抑制低浓度4-HNE诱导的HRMECs增生迁移和管腔形成。

abstractsObjective:To observe the effect of high expression of polypyrimidine tract-binding protein-associated splicing factor (PSF) on low concentration of 4-hydroxynonenal (4-HNE) induced human retinal microvascular endothelial cells (HRMECs), and explore the possible mechanism.Methods:The HRMECs cultured in vitro were divided into 4-HNE treated group, PSF overexpression group combined with 4-HNE group (PSF+4-HNE group), PSF overexpression+ML385 treatment combined with 4-HNE group (PSF+ML385+4-HNE group), and 4-HNE induced PSF overexpression group with LY294002 pretreatment (LY294002+4-HNE+PSF group). Cell culture medium containing 10 μmmol/L 4-HNE was added into 4-HNE treatment group, PSF+4-HNE group, PSF+ML385+4-HNE group for 12 hours to stimulate oxidative stress. 1.0 μg of pcDNA-PSF eukaryotic expression plasmid were transfected into PSF+4-HNE group and PSF+ML385+4-HNE group to achieve the overexpression of PSF. Also cells were pretreated with ML385 (5 μmol/L) for 48 hours in the PSF+ML385+4-HNE group, meanwhile within the LY294002+4-HNE+PSF group, after pretreatment with LY294002, cells were treated with plasmid transfection and 4-HNE induction. Transwell detects the migration ability of PSF to HRMECs. The effect of PSF on the lumen formation of HRMECs was detected by using Matrigel in vitro three-dimensional molding method. Flow cytometer was used to detect the effect of PSF overexpression on reactive oxygen (ROS) level in HRMECs. Protein immunoblotting was used to detect the relative expression of PSF, nuclear factor E2 related factor 2 (Nrf2), heme oxygenase-1 (HO-1) protein, and phosphoserine threonine protein kinase (pAkt) protein. The comparison between the two groups was performed using a t-test. Results:The number of live cells, migrating cells, and intact lumen formation in the 4-HNE treatment group and the PSF+4-HNE group were 1.70±0.06, 0.80±0.13, 24.00±0.58, 10.00±0.67, and 725.00±5.77, 318.7±12.13, respectively. There were significant differences in the number of live cells, migrating cells, and intact lumen formation between the two groups ( t=12.311, 15.643, 17.346; P<0.001). The results of flow cytometry showed that the ROS levels in the 4-HNE treatment group, PSF+4-HNE group, and PSF+ML385+4-HNE group were 816.70±16.67, 416.70±15.44, and 783.30±17.41, respectively. There were statistically significant differences between the two groups ( t=16.311, 14.833, 18.442; P<0.001). Western blot analysis showed that the relative expression levels of pAkt, Nrf2, and HO-1 proteins in HRMECs in the 4-HNE treatment group, PSF+4-HNE group and LY294002+4-HNE+PSF group were 0.08±0.01, 0.57±0.04, 0.35±0.09, 0.17±0.03, 1.10±0.06, 0.08±0.11 and 0.80±0.14, 2.50±0.07, 0.50±0.05, respectively. Compared with the PSF+4-HNE group, the relative expression of pAkt, Nrf2, and HO-1 proteins in the LY294002+4-HNE+PSF group decreased significantly, with significant differences ( t=17.342, 16.813, 18.794; P<0.001). Conclusion:PSF upregulates the expression of HO-1 by activating the phosphatidylinositol 3 kinase/Akt pathway and inhibits cell proliferation, migration, and lumen formation induced by low concentrations of 4-HNE.