摘要目的:观察Krüppel样因子7 （KLF7）对视网膜缺血再灌注（RIR）损伤小鼠RGC存活及ERG的影响。方法:采用随机数字表法将126只雄性C57BL/6J小鼠随机分为正常组、RIR组、正常-KLF7组、正常-绿色荧光蛋白（GFP）组、RIR-KLF7组、RIR-GFP组。小鼠8周龄时，正常-KLF7组及RIR-KLF7组小鼠玻璃体腔注射1.0×10 12 vg/ml过表达KLF7的重组腺相关病毒载体（AAV2-KLF7-GFP）1 μl；正常-GFP组及RIR-GFP组小鼠玻璃体腔注射同样滴度的仅带GFP的空白腺相关病毒载体1 μl。小鼠11周龄时，RIR组、RIR-KLF7组、RIR-GFP组小鼠建立RIR模型并测量眼压。玻璃体腔注射AAV2-KLF7-GFP病毒载体4周后，利用视网膜冰冻切片观察病毒转染情况。RIR建模后第7天，利用视网膜铺片免疫荧光染色定量观察RGC存活率；行全视野ERG检查，观察其暗适应a、b波和振荡电位（Ops ）、光负性反应（PhNR）振幅和潜伏期的变化；行视动反应检测，观察其视敏度的变化。玻璃体腔注射病毒4周后，采用Western bolt检测小鼠视网膜中KLF7的蛋白表达。 结果:与正常组比较，RIR组小鼠视网膜RGC存活率，ERG a、b波振幅，Ops、PhNR振幅以及视敏度均明显降低，差异有统计学意义（ t=12.860、7.157、5.735、8.953、4.744、9.887， P<0.05 ）。随着刺激光强的增加，小鼠暗适应ERG a、b波振幅逐渐升高，其潜伏期逐渐缩短。与RIR组比较，RIR-KLF7组小鼠视网膜RGC存活率，ERG a、b波振幅，Ops、PhNR振幅以及视敏度均明显升高，差异有统计学意义（ t=6.350、3.253、3.695、5.825、5.325、4.591， P<0.05）。Western bolt检测结果显示，正常-KLF7组小鼠视网膜中KLF7蛋白表达较正常组明显上调，差异有统计学意义（ t=4.105， P<0.01 ）。 结论:KLF7过表达可提高RGC存活率，保护其电生理功能。

abstractsObjective:To investigate the effects of Krüppel-like factor 7 (KLF7) on the survival of retinal ganglion cells (RGCs) and electroretinogram (ERG) after retinal ischemia-reperfusion (RIR) injury in mice.Methods:A total of 126 male C57BL/6J mice were randomly divided into normal group, RIR group, normal-KLF7 group, normal-green fluorescent protein (GFP) group, RIR-KLF7 group and RIR-GFP group. At the age of 8 weeks, mice of normal-KLF7 group and RIR-KLF7 group were intravitreally injected 1ul of 1.0×10 12 vg/ml adeno-associated virus overexpressing KLF7 (AAV2-KLF7-GFP). Mice of normal-GFP group and RIR-GFP group were injected adeno-associated virus of AAV2-GFP with the same titer. At the age of 11 weeks, RIR injury was induced in mice of RIR group, RIR-KLF7 group and RIR-GFP group, and intraocular pressure was measured. Retinal cryosections were used to access the efficacy of virus transfection 4 weeks after AAV2-KLF7-GFP transfer. 7 days after RIR injury, RGCs' survival rate was observed and quantified by immunofluorescent staining. ERG was performed to observe the differences in amplitudes and incubation period of scotopic ERG a-, b-wave, oscillatory potentials (Ops), photopic negative responses (PhNR). Optomotor response was performed to observe the differences of visual acuity. Expression of KLF7 was detected by western blot 4 weeks after AAV2-KLF7-GFP transfer. Results:Compared with normal group, RGCs’ survival rates, amplitudes of ERG a-, b-wave, Ops, PhNR and visual acuity of mice in RIR group were decreased, and the differences were statistically significant ( t=12.860, 7.157, 5.735, 8.953, 4.744, 9.887; P<0.05). With the increase of light intensity, the amplitudes of scotopic ERG a- and b-wave were gradually increased while the incubation period was gradually shortened. Compared with RIR group, RGCs’ survival rates, amplitudes of ERG a-, b-wave, Ops, PhNR and visual acuity of mice in RIR-KLF7 group were increased, and the differences were statistically significant ( t=6.350, 3.253, 3.695, 5.825, 5.325, 4.591; P<0.05). Protein level of KLF7 was up-regulated in normal-KLF7 group than those in normal group, and the difference was statistically significant ( t=4.105, P<0.01). Conclusion:Overexpression of KLF7 can improve RGCs’ survival rates and preserve the electrophysiological function.