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Tumor growth in complex, evolving microenvironmental geometries: a diffuse domain approach.

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This study models tumor growth, finding that cell-basement membrane adhesion influences tumor shape and size. Basement membrane stiffness affects invasion, with stiffer membranes initially hindering but ultimately promoting invasiveness.

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Area of Science:

  • Computational biology
  • Mathematical modeling
  • Cancer research

Background:

  • Tumor growth occurs in complex microenvironments with dynamic membranes.
  • Understanding cell-basement membrane interactions is crucial for cancer progression.

Purpose of the Study:

  • To develop a mathematical model of tumor growth in dynamic microenvironments.
  • To investigate the impact of cell-basement membrane adhesion and stiffness on tumor progression and invasion.

Main Methods:

  • Utilized a diffuse domain approach for modeling complex geometries.
  • Incorporated models for cell-cell adhesion, cell-basement membrane adhesion, elastic forces, and matrix degradation.
  • Investigated tumor progression and basement membrane response.

Main Results:

  • Tumor size positively correlates with cell-basement membrane adhesion, leading to elongated tumors.
  • Basement membrane stiffness negatively correlates with tumor size before invasion due to elastic forces.
  • Downregulation of cell-basement membrane adhesiveness is necessary for modeling invasion.
  • Stiff basement membranes promote invasiveness by creating narrow openings, while in 3D, pressure can enlarge openings.

Conclusions:

  • Cell-basement membrane adhesion and basement membrane stiffness are key factors in tumor growth and invasion dynamics.
  • The model provides insights into how microenvironmental factors influence cancer progression.
  • Findings highlight the complex role of basement membrane mechanics in enabling or restricting tumor spread.