[The correlation study of the expression of VEGF with t-PA and PAI expression in plasma and intraocular tissue in proliferative diabetic retinopathy].

Objective: To evaluate the correlation between the expression of VEGF with t-PA and PAI expression in plasma aqueous humor and vitreous of proliferative diabetic retinopathy (PDR).

Methods: It was an experimental study. The concentrations of VEGF t-PA and PAI in plasma, aqueous humor and vitreous body in PDR and normal group were detected by ELISA.

Results: The levels of VEGF (53.37 ng/L) and PAI (8.00 µg/L) in the plasma of PDR patients were higher than control group, and there was significant statistically difference between them (Z = -3.437, -5.816; P < 0.01). The levels of t-PA (24.32 µg/L) in plasma of PDR patients and control group was no statistically difference between them (Z = -1.715, P = 0.086). The levels of VEGF (335.00 ng/L) t-PA (5.70 µg/L) and PAI (0.63 µg/L) in the aqueous humor of PDR patients were higher than control group, and there was statistically difference between them (Z = -4.805, -1.967, -4.018; P < 0.05). The levels of VEGF (691.69 ng/L) t-PA (13.05 µg/L) and PAI (4.01 µg/L) in the vitreous of PDR patients were higher than control group , and there was statistically difference between them (Z = -2.807, -2.642, -2.230;P < 0.05). Compare the plasma aqueous humor and vitreous of PDR patients. The levels of VEGF is: vitreous>aqueous humor>plasma. The levels of t-PA is: plasma>vitreous>aqueous humor. The levels of PAI is: plasma and vitreous>aqueous humor. The expression of VEGF was highly correlated with t-PA and PAI in plasma aqueous humor and vitreous of PDR (P < 0.05).

Conclusions: VEGF PAI in plasma, VEGF t-PA PAI in aqueous humor and vitreous were increases. The expression of VEGF was positive correlated with t-PA and PAI in plasma aqueous humor and vitreous of PDR.