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Related Experiment Video

Updated: Jan 1, 2026

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Multi-layer pre-vascularized magnetic cell sheets for bone regeneration.

Ana S Silva1, Lúcia F Santos1, Maria C Mendes1

  • 1Department of Chemistry, CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal.

Biomaterials
|December 20, 2019
PubMed
Summary

This study developed magnetic cell sheets to create vascularized 3D bone grafts. The engineered tissue promoted bone formation and blood vessel growth, advancing regenerative medicine.

Keywords:
Magnetic cell sheetOsteogenic differentiationScaffold-free tissue engineeringVascularization

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Area of Science:

  • Regenerative Medicine
  • Biomaterials Engineering
  • Tissue Engineering

Background:

  • Effective in vitro production of vascularized 3D bone constructs for clinical translation remains a challenge.
  • Cell sheet (CS) engineering offers a promising microenvironment for vascularization and maintaining cell-matrix integrity.
  • Existing methods struggle to create thick, clinically relevant bone tissue engineered constructs.

Purpose of the Study:

  • To develop hierarchical, vascularized 3D cellular constructs using magnetic responsive heterotypic cell sheets.
  • To investigate the osteogenic and angiogenic potential of stratified cell sheets engineered with iron oxide nanoparticles.
  • To evaluate the synergistic effects of endothelial and stromal cells in promoting bone regeneration.

Main Methods:

  • Fabrication of stratified, magnetic responsive heterotypic cell sheets using iron oxide nanoparticle-labeled cells (human umbilical vein endothelial cells [HUVECs] and adipose-derived stromal cells [ASCs]).
  • Magnetic force-based engineering to construct thick, multilayered cellular constructs.
  • In vitro assessment of osteogenesis (ALP activity, matrix mineralization, protein expression) and in vivo evaluation using a chick chorioallantoic membrane (CAM) assay for vascularization.

Main Results:

  • The heterotypic cell sheet construct (ASCs/HUVECs/ASCs) demonstrated enhanced osteogenesis compared to the homotypic construct (ASCs/ASCs), evidenced by increased ALP activity and matrix mineralization over 21 days.
  • Synergistic signaling between BMP-2 and VEGF was identified, promoting both angiogenesis and osteogenesis.
  • In vivo CAM assay confirmed robust vascular recruitment, preserved human vascular structures, and integration of human cells into host vasculature.

Conclusions:

  • Stratified magnetic responsive heterotypic cell sheets provide a viable strategy for creating vascularized 3D bone constructs.
  • The engineered constructs exhibit significant osteogenic and angiogenic potential, driven by cell-cell crosstalk.
  • This approach holds promise for advancing the clinical translation of lab-based engineered bone tissue.