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p21 Knockdown as a Therapeutic Strategy for Focal Cartilage Injury Repair.

Leila Larijani1, Aria Ahadzadeh Ardebili1,2, Nini Ortiz Vales3

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

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|April 20, 2026
PubMed
Summary

Targeting cellular senescence by suppressing p21 (CDKN1A) with lentiviral shRNA significantly enhances cartilage regeneration in mice. This approach offers a promising therapeutic strategy for treating cartilage defects and osteoarthritis.

Keywords:
CDKN1Acartilage regenerationfocal cartilage injuryintraarticular injectionlentiviral vectorsp21senescenceshRNA therapy

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Molecular Biology

Background:

  • Focal articular cartilage defects lack self-repair, often leading to osteoarthritis.
  • Cellular senescence, marked by increased p21 (CDKN1A) expression, hinders chondrocyte function and cartilage healing.

Purpose of the Study:

  • To investigate if targeted p21 suppression using lentiviral delivery can promote cartilage regeneration.
  • To evaluate the efficacy of p21 knockdown in enhancing chondrocyte proliferation and cartilage repair in vitro and in vivo.

Main Methods:

  • Lentiviral shRNA vectors targeting p21 or control vectors were constructed.
  • In vitro studies involved transducing murine cells and analyzing cell cycle progression.
  • In vivo studies utilized mouse models with cartilage defects, assessing repair via histology and tissue cytometry after intraarticular injection.

Main Results:

  • In vitro, p21 shRNA reduced p21 mRNA by ~80% and increased cells in the G2M phase.
  • In vivo, p21 shRNA treatment significantly improved cartilage repair in both immunocompromised and immunocompetent mice.
  • Tissue cytometry confirmed high transduction efficiency and substantial reduction in p21-positive chondrocytes, correlating negatively with repair outcomes.

Conclusions:

  • Lentiviral-mediated p21 knockdown effectively promotes articular cartilage regeneration.
  • Targeting the p21 pathway represents a viable therapeutic strategy for cartilage repair and osteoarthritis treatment.