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  • Title: Relationship between vascular endothelial growth factor and interleukin-6 in diabetic retinopathy.
    Author: Funatsu H, Yamashita H, Shimizu E, Kojima R, Hori S.
    Journal: Retina; 2001; 21(5):469-77. PubMed ID: 11642376.
    Abstract:
    PURPOSE: To determine the relationship between the severity of diabetic retinopathy and the levels of interleukin-6 (IL-6) and vascular endothelial growth factor (VEGF) in aqueous humor and plasma. METHODS: Forty-four eyes of 34 diabetic patients were studied. The concentrations of VEGF and IL-6 in plasma samples and in aqueous specimens obtained from the eyes during cataract surgery were measured by enzyme-linked immunosorbent assay. RESULTS: Aqueous levels of VEGF and IL-6 were significantly correlated with the severity of diabetic retinopathy (p = 0.793 and p = 0.744, respectively). Vascular endothelial growth factor and IL-6 levels in aqueous humor were significantly correlated with the aqueous protein concentration (p = 0.641 and p = 0.646, respectively). The aqueous level of VEGF was significantly correlated with that of IL-6 (p = 0.627). Aqueous levels of VEGF and IL-6 were also significantly correlated with the grade of fundus findings. Vascular endothelial growth factor and IL-6 concentrations were higher in the aqueous than in the plasma. CONCLUSION: The results of the current study suggest that there is a relationship between VEGF and IL-6 but the role of IL-6 in diabetic retinopathy is unclear and may warrant further investigation.
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