The correlation study of the expression of tissue plasminogen activator and plasminogen activator inhibitor with VEGF expression in proliferative diabetic retinopathy

Abstract

Objective To evaluate the correlation between the expression of tissue plasminogen activator(t -PA)and plasminogen activator inhibitor(PAI)with vascular endothelial growth factor (VEGF)expression in proliferative diabetic retinopathy(PDR).Methods Vitreous samples were taken from 35 eyes with PDR and analyzed with enzyme linked immunosorbent assay(ELISA)for the expression of VEGF, t - PA and PAI.Control samples were from 20 eyes with idiopathic macular hole and analyzed in the same way.The correlation between VEGF expression and the expression of t - PA and PAI in proliferative diabetic retinopathy were studied.Results VEGF, t - PA and PAI were significantly expressed as compared with those in control subjects(P ＜0.01).The expression of t- PA and PAI were highly correlated with that of VEGF in proliferative diabetic retinopathy(P ＜ 0.01).Conclusions It is suggest that a number of bioactive substances may be involved in the pathogenesis of angiogenesis in PDR.The expression of t - PA may beupregulated by the activation of VEGF, which may further facilitate the process of angiogenesis in PDR.Meanwhile, the correlated expression of PAI may suggest the presence of an endogenous angiogenesis mechanism accompanying the activities of VEGF. Key words: Diabetic retinopathy ; Vascular endothelial growth factor ; Tissue - plasminogen activator ; Plasminogen activator inhibitor ; Angiogenesis ;