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Bone grafts engineered from human adipose-derived stem cells in dynamic 3D-environments.

Heidi A Declercq1, Tamara De Caluwé, Olga Krysko

  • 1Tissue Engineering Group, Department of Basic Medical Sciences, Ghent University, De Pintelaan 185 (6B3), 9000 Ghent, Belgium.

Biomaterials
|November 14, 2012
PubMed
Summary

Modular tissue engineering using adipose stem cell microtissues offers a superior bottom-up bone graft approach compared to traditional scaffolds. This method promotes enhanced osteogenic gene expression for high-quality bone regeneration.

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Area of Science:

  • Regenerative Medicine
  • Biomaterials Science
  • Stem Cell Biology

Background:

  • Traditional tissue engineering (TE) faces limitations in creating large, functional bone grafts.
  • Modular TE offers a promising alternative by utilizing self-assembling building blocks.

Purpose of the Study:

  • To compare a bottom-up modular TE approach using adipose tissue-derived stem cells (ADSC) on microcarriers with a top-down scaffold-based approach.
  • To evaluate the osteogenic differentiation and bone graft quality using ADSC and bone marrow-derived stem cells (BMSC).

Main Methods:

  • ADSC-laden microcarriers were used to form microtissues and subsequently macrotissues in a bottom-up manner.
  • Scaffolds were used in a top-down approach for comparison, with both methods employing static and dynamic culture conditions.
  • Immunophenotypic analysis, 2D/3D osteogenic differentiation, (immuno)histochemistry, and gene expression were performed.

Main Results:

  • Dynamic culturing of scaffolds showed high colonization but limited central integration and higher osteogenic gene expression compared to static cultures.
  • A specific cell-to-microcarrier ratio facilitated aggregate formation, leading to microtissue and macrotissue development.
  • Microcarriers promoted upregulation of key osteogenic markers (Runx2, collagen I, BSP, osteocalcin), whereas scaffolds showed downregulation, indicating an end-stage differentiation.

Conclusions:

  • A bottom-up modular TE approach using ADSC-laden microcarriers can engineer high-quality bone grafts (2 cm³).
  • This method demonstrates superior osteogenic potential compared to traditional scaffold-based approaches.