Endothelial function in the time of the giants

Area of Science:

• Vascular Biology
• Cardiovascular Research
• Endothelial Function

Background:

• Endothelium plays a crucial role in regulating vascular tone.
• Dysfunctional endothelium in atherosclerosis and hypertension impairs relaxation and promotes vasoconstriction.
• Platelet aggregation can release vasoactive substances, impacting vascular response.

Purpose of the Study:

• To investigate the in vivo effects of atherosclerosis on vasoconstrictor responses.
• To explore the role of endothelial dysfunction in aortic valvular stenosis.
• To examine the impact of oxidative stress and gene variants on endothelial function.

Main Methods:

• In vivo experiments in atherosclerotic monkeys to assess vasoconstriction.
• Study of aortic valve pathophysiology in hypercholesterolemic mice.
• Gene transfer of extracellular superoxide dismutase (ecSOD) variants in disease models.

Main Results:

• Atherosclerosis significantly potentiates serotonin-induced vasoconstriction in multiple vascular beds.
• Endothelial dysfunction was observed in atherosclerotic monkeys and improved with hypercholesterolemia correction.
• Increased oxidative stress and severe aortic stenosis were noted in hypercholesterolemic mice; ecSOD gene transfer showed differential effects based on variant.

Conclusions:

• Platelet-induced vasospasm may contribute to transient ischemic attacks in atherosclerosis.
• Oxidative stress in stenotic aortic valves may trigger pro-calcific gene expression.
• Gene transfer of ecSOD variants can elucidate mechanisms of endothelial dysfunction and vascular disease predisposition.