Three-dimensional simulation of anisotropic cell-driven collagen gel compaction

Area of Science:

• Biomedical Engineering
• Computational Biology
• Tissue Engineering

Background:

• Tissue equivalents (TEs) are crucial for studying cell behavior in engineered tissues.
• Previous models of TE mechanics were limited to lower dimensions.

Purpose of the Study:

• To solve a 3D anisotropic biphasic theory of tissue equivalent mechanics.
• To validate the model against experimental data in various tissue engineering scenarios.

Main Methods:

• Developed a 3D adaptive finite-element computational platform.
• Solved five coupled partial differential equations describing cell-collagen interactions.
• Applied the model to cell traction assays, cell-seeded gels, and engineered cardiac valve leaflets.

Main Results:

• Model predictions aligned with experimental data for cell traction and cell-seeded gels.
• Observed fiber and cell alignment in simulations matched experimental findings.
• The model captured general fiber alignment in engineered valve leaflets but missed experimental asymmetry.

Conclusions:

• The 3D model provides a robust framework for predicting tissue equivalent mechanics.
• The computational approach enhances understanding of cell-matrix interactions in engineered tissues.
• Further model refinement may be needed to capture complex experimental asymmetries.