VEGF expression and cell apoptosis in NOD mouse retina

Area of Science:

• Ophthalmology
• Endocrinology
• Cell Biology

Background:

• Diabetic retinopathy is a leading cause of vision loss.
• Early detection and understanding of molecular changes are crucial for intervention.
• Vascular Endothelial Growth Factor (VEGF) plays a role in neovascularization and vascular permeability.

Purpose of the Study:

• To investigate retinal vascular endothelial growth factor (VEGF) levels.
• To assess retinal cell apoptosis in early-stage diabetic NOD mice.
• To explore the relationship between VEGF and retinal cell apoptosis.

Main Methods:

• Non-obese diabetic (NOD) mice and control groups were used, with time points at 2, 4, 6, 8, and 12 weeks.
• Enzyme-linked immunosorbent assay (ELISA) measured VEGF levels in serum and retinal tissue.
• Transmission electron microscopy examined retinal cell apoptosis.

Main Results:

• Significantly elevated serum and retinal VEGF levels were observed in NOD mice compared to controls at 12 weeks (P<0.01).
• A strong positive correlation (γ=0.9902, P=0.001) was found between serum and retinal VEGF levels.
• Increased apoptosis in retinal ganglion cells and endothelial cells was noted in NOD mice (P<0.01).

Conclusions:

• Elevated VEGF expression is implicated in increased retinal cell apoptosis during early diabetes.
• Multiple factors related to retinal VEGF expression likely contribute to the pathogenesis of early diabetic retinopathy.