A computational model to predict cell traction-mediated prestretch in the mitral valve

Area of Science:

• Biomedical Engineering
• Tissue Mechanics
• Cellular Mechanobiology

Background:

• Prestretch is a critical mechanical property in soft biological tissues, influencing their function.
• The mechanisms underlying the development of tissue prestretch, particularly in the mitral valve, are not fully understood.
• Growth and remodeling processes are implicated but require further elucidation.

Purpose of the Study:

• To investigate if local cell-mediated traction forces can account for global anisotropic prestretch in the mitral valve.
• To model and quantify the contribution of cellular forces to tissue mechanics.
• To compare model predictions with experimental observations of mitral valve behavior.

Main Methods:

• Implementation of a finite element model for the mitral valve.
• Incorporation of a model predicting actin stress fiber-generated traction forces.
• Systematic variation of model parameters and structural properties to simulate anisotropic prestretch development.

Main Results:

• The model accurately predicted valvular contraction magnitude post-excision, aligning with reported data.
• Simulations demonstrated that anisotropic prestretch development could be achieved by adjusting model parameters.
• The simulated anisotropic prestretch closely resembled physiological values observed in the mitral valve.

Conclusions:

• Cell-generated traction forces are a plausible mechanism explaining the magnitude and anisotropy of mitral valve prestretch.
• The study provides a computational framework for understanding cell-matrix interactions in tissue development.
• Findings contribute to the broader understanding of growth and remodeling in soft biological tissues.