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Chondrogenic Pellet Formation from Cord Blood-derived Induced Pluripotent Stem Cells
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Endochondral Bone Tissue Engineering Using Human Induced Pluripotent Stem Cells.

Michio Arakura1, Sang Yang Lee1,2, Tomoaki Fukui1

  • 1Department of Orthopedic Surgery, Kobe University Graduate School of Medicine, Kobe, Japan.

Tissue Engineering. Part A
|July 26, 2021
PubMed
Summary

Induced pluripotent stem cells (iPSCs) show promise for bone repair. Chondrogenically differentiated iPSC-derived mesenchymal stem cells (iMSCs) successfully regenerated bone defects in mice, demonstrating a new strategy for bone defect repair.

Keywords:
bone regenerationendochondral ossificationinduced pluripotent stem cellsmesenchymal stem cells

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Area of Science:

  • Regenerative Medicine
  • Stem Cell Biology
  • Orthopedic Surgery

Background:

  • Induced pluripotent stem cells (iPSCs) offer potential for bone regenerative strategies.
  • Mesenchymal stem cells derived from iPSCs (iMSCs) can be differentiated into chondrocytes.

Purpose of the Study:

  • To investigate the efficacy of chondrogenically differentiated iMSCs in promoting bone regeneration.
  • To assess the potential of iMSC-based cartilage grafts in repairing critical-sized bone defects in vivo.

Main Methods:

  • Two human iPSC clones (201B7 and 454E2) were differentiated into iMSCs.
  • iMSCs underwent chondrogenic differentiation using 3D pellet culture.
  • Chondrogenically differentiated iMSC pellets were implanted into 2-mm radial bone defects in nude mice, with a control group receiving no treatment.

Main Results:

  • Bone union was observed in 100% (201B7) and 70% (454E2) of experimental groups, significantly higher than the 18% in the control group (p < 0.05).
  • Histological analysis revealed hypertrophic chondrocytes and woven bone formation, indicating endochondral bone ossification (ECO).
  • Complete bone resorption of the graft and replacement by mature, lamellar-like bone was observed by 8 weeks post-transplantation.

Conclusions:

  • Chondrogenically differentiated iMSCs promote significant bone regeneration in a mouse model of radial bone defects.
  • The iMSC-based cartilage graft recapitulates the natural process of endochondral bone ossification.
  • This approach represents a promising strategy for repairing large bone defects using iPSC-derived cells.