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Stimulation and inhibition of angiogenesis in diabetic retinopathy
H Funatsu1, H Yamashita, H Noma
1Department of Ophthalmology, Diabetes Center, Tokyo Women's Medical University, Tokyo, Japan.
Purpose:
To investigate the role of stimulators and inhibitors of angiogenesis in the pathogenesis of diabetic retinopathy.
Methods:
Undiluted vitreous samples and simultaneous paired plasma samples were obtained from 30 diabetic patients (35 eyes) undergoing vitreous surgery. The levels of vascular endothelial growth factor (VEGF), endostatin, and platelet factor-4 (PF-4) were measured simultaneously in each specimen by enzyme-linked immunosorbent assay. The severity of diabetic retinopathy was evaluated according to the modified Early Treatment Diabetic Retinopathy Study retinopathy severity scale.
Results:
Vitreous levels of VEGF and endostatin were significantly correlated with the severity of diabetic retinopathy (rho = 0.52, rho = 0.48, respectively), but the vitreous level of PF-4 was not (rho = 0.12). Vitreous levels of VEGF, endostatin, and PF-4 were not significantly correlated with their plasma levels. The vitreous level of VEGF was significantly correlated with that of endostatin (rho = 0.42). The VEGF concentration was significantly higher in the vitreous than in the plasma, while the endostatin concentration was not.
Conclusions:
The present study showed that VEGF and endostatin were expressed in the vitreous of patients with diabetic retinopathy and may be involved in the pathogenesis of this condition.
Insights
Vascular endothelial growth factor (VEGF) and endostatin in the vitreous humor are linked to diabetic retinopathy severity. These molecules may play a role in the development of this eye condition.
Area of Science:
- Ophthalmology
- Endocrinology
- Molecular Biology
Background:
- Diabetic retinopathy is a leading cause of vision loss.
- Angiogenesis plays a critical role in the progression of diabetic retinopathy.
Purpose of the Study:
- To investigate the role of angiogenesis stimulators and inhibitors in diabetic retinopathy pathogenesis.
- To analyze the correlation between vitreous and plasma levels of key angiogenic factors and retinopathy severity.
Main Methods:
- Vitreous and plasma samples were collected from 30 diabetic patients undergoing vitreous surgery.
- Vascular Endothelial Growth Factor (VEGF), endostatin, and Platelet Factor-4 (PF-4) levels were measured using ELISA.
- Retinopathy severity was graded using the Early Treatment Diabetic Retinopathy Study scale.
Main Results:
- Vitreous VEGF and endostatin levels significantly correlated with diabetic retinopathy severity (rho=0.52 and 0.48).
- Vitreous VEGF was significantly higher than plasma VEGF; endostatin levels did not differ significantly.
- Vitreous VEGF and endostatin levels were positively correlated (rho=0.42).
Conclusions:
- VEGF and endostatin are present in the vitreous of patients with diabetic retinopathy.
- These factors are implicated in the pathogenesis of diabetic retinopathy.
- Further research is warranted to explore therapeutic strategies targeting these angiogenic factors.