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Related Experiment Videos

Cellular and matrix contributions to tissue construct stiffness increase with cellular concentration.

J Pablo Marquez1, Guy M Genin, Kenneth M Pryse

  • 1Department of Mechanical & Aerospace Engineering, Campus Box 1185, Washington University, St. Louis, MO 63130, USA. pablo@me.wustl.edu

Annals of Biomedical Engineering
|July 29, 2006
PubMed
Summary

Cellular and extracellular matrix contributions to bio-artificial tissue mechanics increase with cell density. Higher cell concentrations dramatically increase active cellular forces in fibroblast-populated matrices.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Biomechanics

Background:

  • Bio-artificial tissue constructs integrate cells and extracellular matrix (ECM) for functional properties.
  • Understanding the distinct mechanical roles of cellular and ECM components is crucial for tissue engineering.

Purpose of the Study:

  • To quantify the individual contributions of cells and ECM to the mechanics of fibroblast-populated matrices (FPMs).
  • To investigate the relationship between cell concentration and mechanical properties in engineered tissues.

Main Methods:

  • Mechanical testing, including relaxation tests, was performed on FPMs with varying chick embryo fibroblast cell concentrations within a type I collagen ECM.
  • Mechanical modeling was employed to analyze force contributions.

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  • Selective biochemical elimination of tissue components was used to differentiate cellular and ECM roles.

    • Main Results:

    • Both cellular and ECM contributions to FPM mechanics increased exponentially with cell concentration.
    • Force responses during relaxation tests showed a logarithmic decay over 3600 seconds.
    • Active cellular forces significantly increased in FPMs with higher cell densities, demonstrating a dramatic rise.

    Conclusions:

    • Cell concentration is a critical factor governing the mechanical behavior of fibroblast-populated matrices.
    • The active cellular component plays a significant role in the mechanics of engineered tissues, particularly at higher cell densities.