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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 distinct macro- and microvascular complications.

Sumathy Mohan¹, Robert L Reddick, Nicolas Musi

¹Department of Pathology, The University of Texas Health Science Center, San Antonio, TX 78229, USA. mohan@uthscsa.edu

Laboratory Investigation; a Journal of Technical Methods and Pathology

|April 9, 2008

Summary

Impaired endothelial nitric oxide synthase (eNOS) activity worsens diabetic organ damage, particularly in the kidneys, even with lower blood sugar. This study highlights eNOS

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Modeling and Evaluation of Murine Diabetic Cardiomyopathy Model

Modeling and Evaluation of Murine Diabetic Cardiomyopathy Model

Published on: November 29, 2024

Area of Science:

Cardiovascular Biology
Renal Physiology
Metabolic Disease Research

Background:

Endothelial nitric oxide synthase (eNOS) dysfunction contributes to diabetic complications.
The specific organ-level effects of eNOS deficiency in diabetes remain unclear.

Purpose of the Study:

To investigate the functional consequences of combined genetic disruption of eNOS and diabetic conditions.
To characterize organ-specific abnormalities in a novel double-knockout mouse model.

Main Methods:

Generation and characterization of eNOS-/-/ lepr(db/db) double-knockout (DKO) mice.
Assessment of metabolic parameters (obesity, hyperglycemia, hyperinsulinemia, hypertension).
Histopathological analysis of pancreas, liver, aorta, and kidney tissues.

Main Results:

DKO mice exhibited obesity, hyperglycemia, hyperinsulinemia, and hypertension.
Pancreatic islets were enlarged, and hepatocytes showed fat accumulation.
Aorta remained normal without injury, but showed impaired re-endothelialization and increased medial thickness post-injury.
Significant glomerular capillary damage and diabetic nephropathy were observed in the kidneys.

Conclusions:

Absence of eNOS exacerbates hyperglycemia-induced organ-specific complications in diabetes, with a pronounced effect on renal microvasculature compared to the aorta.
The DKO model provides critical insights into the role of eNOS in diabetic vascular and renal pathology.
This model may facilitate the development of novel therapeutic strategies for diabetic complications.