Experimental study of kallikrein-kinin system participating in proliferative vitreoretinopathy procedure / 中华实验眼科杂志

ABSTRACT

Background Our previous study demonstrated that kallikrein-kinin is a special protein in vitreous of the eye with proliferative vitreoretinopathy(PVR),and the expression intensity of kallikrein-kinin showed the positive correlation with the grade of PVR.Objective This study was to further explore whether kallikrein-kinin participate in the formation of PVR.Methods Rat retinal pigment epithelial cell line(RPE-J cells) was cultured in DMEM containing 4% fetal bovine serum and then prepared into suspension by PBS with the cells density of 2.5×108 cells/ml.Platelet-rich plasma was prepared by PBS with the platelet 2.5×108 /ml.RPE cell suspension(4μl) and platelet-rich plasma(6μl) was intravitreally injected in the left eyes of 30 clean Wistar rats to establish the PVR models,and 10μl sterile pyrogen-free normal saline solution was used in the same way in other matched rats as controls.The PVR was graded on Francine's criteria in 1 day,3,7,14,21,28 days after injection under the slit lamp.The serum,vitreous and retina were obtained in 28 days after injection to assess the expression of bradykinin using Western blot.The histopathology examination of rat retina was performed in the 28th day after injection.This experimental procedure followed the Regulations for the Administration of Affair Concerning Experimental Animals by State Science and Technology Commission.Results Typical PVR was seen in 25 models with the successful rate 89.3% at 28 days after injection.PVR 1,2,3 grades were respectively exhibited in 7,14,28 days under the slit lamp.Infiltration of inflammatory cells and migration of RPE cells were found in the 7th day.In the 14th day after injection,RPE cells transformed into fibroblasts and retinal detachment occurred after that.Western blot analysis revealed that bradykinin was detected in vitreous,serum and retinal samples of rats in experimental and control rats,but the expression intensity was higher in the rats of model groups.Conclusion Intravitreal co-injection of RPE cells and platelet-rich plasma can effectively induce a model of PVR in Wistar rat.The kallikrein-kinin system probably takes part in the onset of PVR.