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Diabetic Retinopathy

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...

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Updated: Jun 1, 2026

Retinal Cryo-sections, Whole-Mounts, and Hypotonic Isolated Vasculature Preparations for Immunohistochemical Visualization of Microvascular Pericytes

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Sema3A [corrected] resists retinal revascularization.

¹Wilmer Eye Institute.

|June 4, 2011

Summary

This summary is machine-generated.

Hypoxic neurons in the retina secrete Semaphorin3A (Sema3A), inhibiting blood vessel regeneration. This discovery sheds light on the mechanisms behind pathologic preretinal neovascularization.

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Area of Science:

Ophthalmology
Neuroscience
Vascular Biology

Background:

Ischemic retinopathies are characterized by abnormal blood vessel growth.
Hypoxia is a key driver of neovascularization in the retina.

Discussion:

Semaphorin3A (Sema3A) is identified as a key mediator secreted by hypoxic neurons.
Sema3A actively inhibits retinal vascular regeneration.

Key Insights:

The study reveals a novel mechanism where Sema3A promotes pathologic neovascularization.
This finding links neuronal hypoxia to aberrant blood vessel formation in the retina.

Outlook:

Targeting Sema3A may offer new therapeutic strategies for ischemic retinopathies.
Further research is needed to explore the precise signaling pathways involved.