Endothelial structure in rabbits with moderate hypercholesterolaemia. A scanning electron microscopic study

Area of Science:

• Cardiovascular Biology
• Pathology
• Microscopy

Background:

• Hypercholesterolemia is a known risk factor for atherosclerotic arterial disease.
• The specific mechanisms by which high cholesterol affects arterial endothelium require further elucidation.

Purpose of the Study:

• To investigate the structural and functional changes in the aortic endothelium of rabbits with diet-induced hypercholesterolemia.
• To determine the role of hemodynamic strain in hypercholesterolemia-induced endothelial alterations.

Main Methods:

• Scanning electron microscopy was used to examine the aortic surfaces of rabbits fed a cholesterol supplement.
• Rabbits were divided into normal and hypercholesterolemic groups.
• Aortic regions with varying hemodynamic strain were analyzed.

Main Results:

• Hypercholesterolemia exacerbated cell injury in regions of high hemodynamic strain compared to normal rabbits.
• Intimal thickenings with surrounding cell injury developed in cholesterol-fed rabbits in high strain areas.
• Loss of fine-structural details was observed in the endothelium of hypercholesterolemic rabbits in low strain regions.

Conclusions:

• Hypercholesterolemia increases endothelial cell susceptibility to injury.
• Diet-induced hypercholesterolemia can lead to intimal thickening and endothelial dysfunction.
• These findings suggest hypercholesterolemia negatively impacts endothelial integrity, contributing to atherosclerotic arterial disease.