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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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Definition Diabetic nephropathy is a chronic kidney complication that results from prolonged hyperglycemia.Prevalence It is the most common cause of chronic kidney disease (CKD) and end-stage renal disease (ESRD) worldwide, affecting up to half of individuals with diabetes.Pathophysiology • Sustained hyperglycemia triggers multiple hemodynamic and metabolic changes in the kidney. • Early in the disease, increased renal blood flow and glomerular hyperfiltration occur due to afferent arteriolar...

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Updated: Jun 13, 2026

An Assay to Detect Protection of the Retinal Vasculature from Diabetes-Related Death in Mice

An Assay to Detect Protection of the Retinal Vasculature from Diabetes-Related Death in Mice

Published on: January 12, 2024

Diabetic eNOS-knockout mice develop accelerated retinopathy.

Qiuhong Li¹, Amrisha Verma, Ping-Yang Han

¹Department of Ophthalmology, College of Medicine, University of Florida, Gainesville, Florida 32610-0284, USA. qli@ufl.edu

Investigative Ophthalmology & Visual Science

|May 4, 2010

Summary

This summary is machine-generated.

Endothelial nitric oxide synthase (eNOS) deficiency exacerbates diabetic retinopathy in mice, increasing vascular permeability and complications. This highlights eNOS-derived nitric oxide's crucial role in maintaining retinal vascular health.

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Area of Science:

Ophthalmology
Vascular Biology
Diabetology

Background:

Endothelial nitric oxide synthase (eNOS) dysfunction is linked to diabetic vascular issues.
Diabetic retinopathy (DR) is a major microvascular complication of diabetes.

Purpose of the Study:

To investigate the role of eNOS in diabetic retinopathy development.
To examine the functional consequences of eNOS deficiency in diabetic conditions.

Main Methods:

Diabetes induced in eNOS-knockout and wild-type mice using streptozotocin.
Assessed retinal vascular permeability, acellular capillaries, gliosis, and basement membrane thickness.
Measured nitric oxide levels and inducible nitric oxide synthase (iNOS) expression.

Main Results:

Diabetic eNOS-knockout mice showed significantly increased retinal vascular permeability.
Accelerated onset and increased acellular capillaries, gliosis, and basement membrane thickening were observed.
Elevated nitric oxide levels and iNOS expression were noted in diabetic eNOS-knockout retinas.

Conclusions:

eNOS-derived nitric oxide is essential for maintaining retinal vascular function in diabetes.
The eNOS-knockout mouse model effectively replicates human diabetic retinopathy vascular changes.
This model aids in understanding DR pathogenesis and developing therapeutic strategies.