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The ability of induced pluripotent stem cells or iPSCs to differentiate into most body cell types has stimulated repair and regenerative medicine research over the past few decades. iPSC-derived blood cells, hepatocytes, beta islet cells, cardiomyocytes, neurons, and other cell types can repair injuries or regenerate damaged tissue in diseases such as diabetes and neurodegenerative disorders.
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Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
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Teratoma-free cartilage regeneration using p21-/- iPSCs engineered with iCasp9.

Leila Larijani1, Derrick Rancourt1,2, Roman J Krawetz1,3

  • 1McCaig Institute for Bone & Joint Health, University of Calgary, Calgary, Alberta T2N4N1Canada.

Stem Cells Translational Medicine
|November 19, 2025
PubMed
Summary

Induced pluripotent stem cells (iPSCs) show promise for cartilage repair. A safety system, iCaspase9 (iCasp9), effectively eliminated iPSCs post-transplantation, preventing tumor formation and preserving cartilage regeneration potential.

Keywords:
cartilage regenerationiCasp9induced pluripotent stem cellstumor formation

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Area of Science:

  • Regenerative Medicine
  • Stem Cell Biology
  • Orthopedics

Background:

  • Articular cartilage has limited self-repair due to its avascular and aneural nature, leading to osteoarthritis (OA) after injury.
  • Stem cell therapies, including induced pluripotent stem cells (iPSCs), offer potential for cartilage regeneration but face safety concerns like post-transplantation tumorigenesis.
  • The iCaspase9 (iCasp9) system allows for inducible apoptosis of genetically modified cells, providing a safety mechanism.

Purpose of the Study:

  • To evaluate the safety and efficacy of the iCaspase9 (iCasp9) suicide system in controlling induced pluripotent stem cells (iPSCs) for cartilage repair.
  • To assess if iCasp9-mediated elimination of iPSCs mitigates tumor formation without compromising cartilage regeneration.
  • To investigate the role of p21 mutations in conjunction with the iCaspase9 system for enhanced cartilage repair and safety.

Main Methods:

  • Engineered induced pluripotent stem cells (iPSCs) with the iCaspase9 (iCasp9) system, in both p21 knockout (p21-/-) and wildtype (p21+/+) backgrounds.
  • Transplantation of iPSCs into a mouse cartilage injury model.
  • Administration of the iCaspase9 activator AP20187 to assess tumor suppression and cartilage regeneration.

Main Results:

  • Tumor formation was observed in mice receiving iPSCs without iCaspase9 activation, regardless of p21 status.
  • No tumors were detected in mice treated with AP20187, indicating successful iCaspase9-mediated cell elimination.
  • Both p21-/- and p21+/+ iPSCs facilitated comparable cartilage regeneration, suggesting the safety system does not impede therapeutic efficacy.

Conclusions:

  • The iCaspase9 (iCaspase9) system provides an effective safety switch for induced pluripotent stem cells (iPSCs) in cartilage regeneration.
  • iCaspase9-mediated elimination of iPSCs successfully prevents post-transplantation tumorigenesis while preserving their chondrogenic potential.
  • This approach offers a promising strategy for the clinical translation of iPSC-based therapies for cartilage repair.