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Cell mechanics studied by a reconstituted model tissue.

T Wakatsuki1, M S Kolodney, G I Zahalak

  • 1Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

Biophysical Journal
|October 29, 2000
PubMed
Summary
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This study quantifies the mechanical properties of fibroblast-populated matrices (FPMs), revealing distinct cellular and matrix contributions to tissue stiffness. Understanding these components is crucial for advancing tissue engineering and regenerative medicine.

Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Mechanobiology

Background:

  • Tissue models composed of cells and extracellular matrix (ECM) mimic natural tissues.
  • Cellular cytoskeletal and matrix proteins dictate tissue force and stiffness.
  • Cells actively regulate tissue mechanics during development and healing.

Purpose of the Study:

  • To quantitatively characterize the mechanical properties of fibroblast-populated matrices (FPMs).
  • To differentiate between active cellular and passive matrix contributions to tissue mechanics.
  • To understand how cell density influences mechanical properties in reconstituted tissues.

Main Methods:

  • Fibroblast-populated matrices (FPMs) were created as reconstituted connective tissue models.

Related Experiment Videos

  • Uniaxial stretch measurements were employed to quantify mechanical properties.
  • Cellular contractile forces were modulated using calf serum (active component) and F-actin disruption with cytochalasin D (passive component).

    • Main Results:

    • FPMs exhibited mechanical behaviors similar to natural tissues, including exponential stress-strain relationships.
    • The active component's mechanical properties were independent of cell density above a threshold.
    • The passive component's stiffness and modulus increased with cell number due to matrix compression and reorganization.

    Conclusions:

    • Mechanical properties of reconstituted tissues can be quantitatively characterized by separating active and passive contributions.
    • Cell density significantly impacts the passive mechanical properties of the extracellular matrix.
    • These findings are essential for controlling and optimizing mechanical properties in tissue engineering applications.