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Effect of high glucose concentration on VEGF and PEDF expression in cultured retinal Müller cells
Hua Mu1, Xiao-Mei Zhang, Jian-Ju Liu
1Department of Ophthalmology, Eye Hospital, The First Affiliated Hospital, Harbin Medical University, 23 Youzheng Road, 150001 Harbin, China. muhua998@sohu.com
Abstract:
To explore the effect of high glucose concentration on the expression of vascular endothelial growth factor (VEGF) and pigment epithelium derived factor (PEDF) in the cultured rat retinal Müller cells. Rat Müller cells were cultured and RT-PCR and Western-blot analysis were used to measure the levels of VEGF and PEDF in cultured Müller cells at different high glucose concentrations. Under 10, 20, 30 mmol/L high glucose conditions, the levels of VEGF mRNA and protein increased and the levels of PEDF mRNA and protein decreased. These results suggest that the VEGF and PEDF expression in Müller cells are unbalance under high glucose concentration, which contribute to retinal neovascularization in diabetic retinopathy.
Insights
High glucose levels disrupt the balance of vascular endothelial growth factor (VEGF) and pigment epithelium derived factor (PEDF) in rat retinal Müller cells. This imbalance is linked to the development of retinal neovascularization in diabetic retinopathy.
Area of Science:
- Ophthalmology
- Cell Biology
- Diabetic Retinopathy Research
Background:
- Diabetic retinopathy is a leading cause of vision loss, characterized by abnormal blood vessel growth in the retina.
- Müller cells play a crucial role in retinal homeostasis and are implicated in the pathogenesis of diabetic retinopathy.
- Vascular Endothelial Growth Factor (VEGF) and Pigment Epithelium Derived Factor (PEDF) are key regulators of angiogenesis.
Purpose of the Study:
- To investigate the impact of high glucose concentrations on the expression of VEGF and PEDF in cultured rat retinal Müller cells.
- To elucidate the role of VEGF and PEDF dysregulation in high glucose conditions relevant to diabetic retinopathy.
Main Methods:
- Primary rat retinal Müller cells were cultured in vitro.
- Cells were exposed to varying concentrations of high glucose (10, 20, 30 mmol/L).
- Quantitative analysis of VEGF and PEDF at both mRNA and protein levels was performed using RT-PCR and Western blot.
Main Results:
- High glucose exposure significantly increased VEGF mRNA and protein expression in Müller cells.
- Conversely, high glucose exposure led to a significant decrease in PEDF mRNA and protein levels.
- A clear imbalance in VEGF and PEDF expression was observed under hyperglycemic conditions.
Conclusions:
- High glucose concentration induces an imbalance between VEGF and PEDF expression in retinal Müller cells.
- This VEGF/PEDF dysregulation in Müller cells is a potential contributing factor to the retinal neovascularization observed in diabetic retinopathy.
- Targeting this imbalance may offer a therapeutic strategy for managing diabetic retinopathy.
