In vitro characterization of endothelial damage from rapid multiaxial mechanical loading.

Area of Science:

• Biotechnology and Biomedical Engineering
• Cellular and Molecular Biology
• Cardiovascular Research

Background:

• Endothelial cells form a vital monolayer regulating blood transport.
• Vascular interventions like angioplasty induce mechanical stress, causing endothelial damage.
• This damage contributes to complications such as neointimal hyperplasia and restenosis.

Purpose of the Study:

• To investigate endothelial monolayer damage under various in vitro mechanical loading conditions.
• To develop a computational model predicting endothelial damage based on mechanical stimuli.
• To identify key metrics for assessing and mitigating iatrogenic endothelial injury.

Main Methods:

• Endothelial cells cultured into confluent monolayers on elastomer substrates.
• A novel bi-stable device used for uniaxial, strip-biaxial, and equibiaxial stretching.
• Quantification of endothelial damage via relative void area and development of a discrete network model.

Main Results:

• Equibiaxial stretching resulted in significantly higher endothelial damage compared to uniaxial or strip-biaxial states.
• The discrete network model successfully rationalized experimental observations.
• Strain energy density was identified as a predictive measure for endothelial damage across various kinematic states.

Conclusions:

• Mechanical loading conditions significantly influence endothelial cell damage.
• Strain energy density offers a predictive criterion for endothelial denudation risk.
• Findings provide a framework for optimizing clinical procedures to minimize iatrogenic injury and improve vascular health.