Endothelial Dysfunction in Youth-Onset Type 2 Diabetes: A Clinical Translational Study

Area of Science:

• Cardiovascular Research
• Endocrinology
• Biomedical Imaging

Background:

• Youth-onset type 2 diabetes (Y-T2D) increases coronary atherosclerotic disease risk.
• Early pathological features and cardiac endothelial dysfunction in Y-T2D remain unevaluated.
• Endothelial function MRI may detect dysfunction before classical risk factors manifest.

Purpose of the Study:

• Evaluate peripheral and coronary artery structure and endothelial function in young adults with recent Y-T2D.
• Assess plasma-derived small extracellular vesicles' effects on endothelial cells.
• Corroborate imaging findings with cellular and molecular analyses.

Main Methods:

• Utilized endothelial function magnetic resonance imaging (3.0T) to measure coronary and brachial artery function.
• Analyzed plasma-derived small extracellular vesicles from Y-T2D patients and healthy peers.
• Treated human coronary artery endothelial cells with Y-T2D plasma-derived small extracellular vesicles, assessing protein expression, oxidative stress, and nitric oxide levels.

Main Results:

• Y-T2D patients showed greater coronary wall thickness and impaired endothelial function (coronary and brachial).
• Y-T2D plasma-derived small extracellular vesicles decreased nitric oxide and increased oxidative stress and inflammation in endothelial cells.
• Hemoglobin A1c and hs-CRP were higher in Y-T2D, but lipid profiles were similar.

Conclusions:

• Coronary and brachial endothelial dysfunction are evident early in Y-T2D, even without severe hyperglycemia or dyslipidemia.
• Plasma-derived small extracellular vesicles contribute to endothelial dysfunction markers.
• Accelerated subclinical coronary atherosclerosis is an early feature of Y-T2D.