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Reduced cyclic stretch, endothelial dysfunction, and oxidative stress: an ex vivo model
Tyler Thacher1, Veronica Gambillara, Rafaela F da Silva
1LHTC, Institute of Bioengineering, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland. tyler.thacher@epfl.ch
Summary
Reduced arterial compliance impairs endothelial function and increases oxidative stress, elevating cardiovascular disease risk. This study shows decreased vascular relaxation and eNOS activity, alongside increased reactive oxygen species production.
Area of Science:
- Cardiovascular Biology
- Endothelial Function
- Oxidative Stress Research
Background:
- Cardiovascular disease is linked to impaired endothelial function and elevated oxidative stress.
- Cyclic stretch is a critical factor in maintaining vascular health.
Purpose of the Study:
- To investigate if reduced cyclic stretch impairs endothelial function.
- To determine if reduced cyclic stretch elevates basal oxidative stress levels.
Main Methods:
- Ex vivo (porcine carotid arteries) and in vitro (endothelial cells) models were used.
- Reduced stretch was achieved by using less compliant materials, decreasing stretch from 4-5% to 1%.
Main Results:
- Reduced compliance significantly decreased bradykinin-dependent relaxation and eNOS (endothelial nitric oxide synthase) phosphorylation.
- Increased reactive oxygen species production was observed, visualized by DHE.
- Expression of p22-phox and p47-phox, components of NAD(P)H oxidase, was upregulated.
Conclusions:
- Reduced arterial compliance leads to a less functional endothelium.
- The eNOS activation pathway is interrupted by reduced compliance.
- Vascular oxidative stress levels are increased, contributing to arterial disease risk.
