重组人促红细胞生成素对急性高眼压兔视网膜谷氨酸表达的影响

目的探讨全身应用重组人促红细胞生成素（rhEPO）对急性高眼压兔眼视网膜谷氨酸表达的影响。方法采用日本大耳白兔54只,其中6只兔设为正常对照组。其余48只兔采用生理盐水前房灌注加压法建立急性高眼压模型,其中24只兔皮下注射rhEPO为EPO组,另外24只兔为模型组。分别于造模后第1、3、7、14天免疫组织化学法观察视网膜谷氨酸的表达。结果正常组视网膜组织无谷氨酸表达。模型组兔眼视网膜出现谷氨酸阳性表达细胞,各观察时间点EPO组兔眼视网膜谷氨酸阳性表达细胞数较模型组减少,差异均有统计学意义（P〈0.01）。实验第14天,模型组视网膜谷氨酸阳性表达细胞数为（3.3±1.1）个/高倍视野,EPO组为（0.3±0.2）个/高倍视野,差异有统计学意义（P〈0.01）。结论rhEPO可以下调兔眼急性高眼压引起的视网膜谷氨酸高表达,可能与rhEPO保护视网膜神经功能损害有关。

Effects of recombinant human erythropoietin on glutamate expression in the retina with acute high intraocular pressure in a rabbit model

Objective The neuroprotection provided by recombinant human erythropoietin(rhEPO)on the retina from ischemia-reperfusion injury has been confirmed but its mechanism is not fully understood.The present study aimed to investigate the effect of systemic administration of recombinant human erythropoietin(rhEPO)on the expression of glutamate in the retina after acute high intraocular pressure in vitro.MethodsThe acute high intraocular pressure models were established by the perfusion of physiological saline into anterior chamber of the lateral eye in forty-eight Japanese white rabbits.Other 6 Japanese white rabbits were as normal control group.The experimental rabbits were then equally divided into the model group and EPO group,and hypodermic injection of rhEPO was only performed in the EPO group.Glutamate expression in the retina in both groups was observed by immunohistochemistry on days 1,3,7,and 14 after retinal ischemia-reperfusion.Glutamate expression in another 6 rabbit retina without any treatment was determined as normal by the same method.The use of animal followed the Standard of Association for Research in Vision and Ophthalmology.ResultsNo positive expression of glutamate was observed in normal rabbit retina,but positive expression response of glutamate occurred in the rabbit retina of the model group.The number of positive expression cells in the EPO group was more than that in the model group at each time point(P＜0.01).On day 14 after ischemia-reperfusion,the number of positive expression cells was 3.3±1.1 per high visual field in the retina of the model group but 0.3±0.2 in the retina of the EPO group,showing a significant decrease of positive expression cells in EPO group(P＜0.01).ConclusionSystemic administration of rhEPO can down-regulate the expression of glutamate in the retina with acute high intraocular pressure.This process may be one of the mechanisms that rhEPO protects the retina from ischemia reperfusion injury.