Expression of erythropoietin and erythropoietin receptor in detached retina in rat model

Objective To observe the expression of erythropoietin (EPO) and EPO receptor (EPOR) in detached retina in rat model.Methods Fourty-eight male SD rats were randomly divided into control group and retinal detachment (RD) groups (1 hour,3,6,12,24,48,and 72 hours group) with 6 rats (12 eyes) in each group.1.4% hyaluronic acid was slowly injected into the subretinal space to induce the detachment of the upper retina to set up the RD model.The expression levels of mRNA and protein of EPO and EPOR were measured by RT-PCR and western-blotting analysis.Meanwhile,the locations of EPO and EPOR in retina were checked by immunohistochemistry.Results Both of the mRNA and protein levels of EPO and EPOR increased after RD,and reached the peak at the 48th hour after RD.The mRNA levels of EPO and EPOR were significantly higher in the 6 and 12 hours group than that in the control group(P< 0.05).The protein levels of EPO and EPOR were significantly higher in 3 hours group than that in the control group(P<0.05).Immunohistochemistry indicated weak expression of EPO from ganglion cell layer to inner and outer segment of photoreceptor cells,and strong expression in the corresponding location was found 48 hours after RD.Expression of EPOR from ganglion cell layer to inner segment of photoreceptor cells in the normal retina was detected,and strong expression in the corresponding location was found 48 hours after RD.Conclusion The expression of EPO and EPOR in retina increases gradually after RD,and reaches the peak at the 48th hour;most of the layers of neural retina can express EPO and EPOR. Key words: Erythropoietin,recombinant; Receptors,erythropoietin; Retinal detachment/etiology; Animal experimentation