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Related Experiment Video

Updated: Jun 10, 2026

Fabrication of Micro-tissues using Modules of Collagen Gel Containing Cells
09:28

Fabrication of Micro-tissues using Modules of Collagen Gel Containing Cells

Published on: December 13, 2010

Effectiveness factor and diffusion limitations in collagen gel modules containing HepG2 cells.

Lindsay Corstorphine1, Michael V Sefton

  • 1Institute of Biomaterials and Biomedical Engineering, University of Toronto, Canada.

Journal of Tissue Engineering and Regenerative Medicine
|July 24, 2010
PubMed
Summary
This summary is machine-generated.

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Modular tissue engineering uses small, cell-containing modules to overcome oxygen diffusion limits in engineered tissues. This study confirms small modules sustain high cell densities, avoiding hypoxia and mass transfer issues common in larger constructs.

Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Cellular Engineering

Background:

  • Hypoxia is a major challenge in thick, three-dimensional (3D) engineered tissues due to oxygen diffusion limitations.
  • Modular tissue engineering, assembling small cell-laden modules, offers a scalable and vascularized solution.
  • The assumption of negligible mass transfer resistance within small modules needed validation.

Purpose of the Study:

  • To theoretically and experimentally investigate oxygen transport and mass transfer limitations within small tissue engineering modules.
  • To determine the impact of module size on cell density, distribution, and viability.
  • To validate the effectiveness factor as a predictor of maximum cell density in modules.

Main Methods:

  • Theoretical analysis of oxygen transport within modules using the effectiveness factor.

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Last Updated: Jun 10, 2026

Fabrication of Micro-tissues using Modules of Collagen Gel Containing Cells
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Fabrication of Micro-tissues using Modules of Collagen Gel Containing Cells

Published on: December 13, 2010

Hydrogel Arrays Enable Increased Throughput for Screening Effects of Matrix Components and Therapeutics in 3D Tumor Models
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Hydrogel Arrays Enable Increased Throughput for Screening Effects of Matrix Components and Therapeutics in 3D Tumor Models

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Microengineering 3D Collagen Hydrogels with Long-Range Fiber Alignment

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  • Experimental fabrication of small (400 µm) and large (700 µm) HepG2-collagen modules at varying cell seeding densities.
  • Assessment of cell density, distribution, morphology, and viability within modules.

    • Main Results:

    • Small modules sustained high cell densities (8.0 × 10^7 cells/cm^3) with negligible mass transfer inhibition.
    • Large modules exhibited a necrotic core and significantly reduced cell densities (1.5 × 10^7 cells/cm^3).
    • Cell density within modules self-regulated to approximately 8000 cells/module based on oxygen availability.

    Conclusions:

    • Small-diameter modules effectively avoid internal mass transfer limitations in tissue engineering.
    • The effectiveness factor is a reliable tool for estimating maximum cell density per module.
    • Modular tissue engineering with small modules is a viable strategy for creating well-oxygenated, dense cellular constructs.