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Objective To evaluate nitric oxide(NO)and vascular endothelial growth factor(VEGF)in vitreous humor and blood samples in patients with proliferative diabetic retinopathy(PDR)and in patients with branch retinal vein occlusion(BRVO).Methods NO concentrations were determined by using the Greiss reaction in plasma and vitreous humor samples.VEGF levels were assayed by ELISA.The patients in the studies were divided into four groups:16 patients with PDR,5 patients with BRVO,11 patients with rhegmatogenous retinal detachment(RRD),and 10 patients with idiopathic macular hole(IMH).Results The vitreous fluid levels of NO were significantly higher in patients with PDR(15.2μmol/L,4.6-50.9μmol/L)than those in the other three groups(F=5.13,P=0.005).The concentrations of VEGF were significantly higher in patients with PDR and BRVO(1507.2 μg/mL,50.71-3722.0μg/ml;838.8μg/mL,159.6-3328.0μg/mL)than those in the other two groups(F=6.84,P=0.0008),but highest in PDR(T=3.92,P=0.001).There was no significant difference between NO and VEGF in serum in four groups.There was no correlation between concentrations of NO and VEGF in four groups whatever in vitreous or plasma(all P>0.05).Conclusion The results suggest that higher levels of NO and VEGF may be related to the angiogenesis in DR.
Objective To evaluate nitric oxide (NO) and vascular endothelial growth factor (VEGF) in vitreous humor and blood samples in patients with proliferative diabetic retinopathy (PDR) and in patients with branch retinal vein occlusion (BRVO). Methods NO concentrations were determined by using the Greiss reaction in plasma and vitreous humor samples. VEGF levels were assayed by ELISA. The patients in the studies were divided into four groups: 16 patients with PDR, 5 patients with BRVO, 11 patients with rhegmatogenous retinal detachment (RRD), and 10 patients with idiopathic macular hole (IMH). Results The vitreous fluid levels of NO were significantly higher in patients with PDR (15.2 μmol / L, 4.6-50.9 μmol / L) than those in the other three groups (F = 5.13, P = 0.005). The concentrations of VEGF were significantly higher in patients with PDR and BRVO (1507.2 μg / mL, 50.71-3722.0 μg / ml; 838.8 μg / mL, 159.6-3328.0 μg / mL) than those in the other two groups (F = 6.84, P = 0.0008), but highest in PDR (T = 3.92, P = 0.001). There was no signif icant difference between NO and VEGF in serum in four groups. Here was no correlation between concentrations of NO and VEGF in four groups whatever in vitreous or plasma (all P> 0.05) .Conclusion The results suggest that higher levels of NO and VEGF may be related to the angiogenesis in DR.