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Rotator cuff repair using cell sheets derived from human rotator cuff in a rat model.

Yoshifumi Harada1, Yutaka Mifune1, Atsuyuki Inui1

  • 1Department of Orthopedic Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|May 13, 2016
PubMed
Summary

Human rotator-cuff derived cell sheets promoted cartilage regeneration and blood vessel growth in a rat rotator cuff model. This cell sheet treatment led to superior mechanical strength, offering a promising strategy for tendon tissue engineering.

Keywords:
cell sheetenthesisrotator cuff repairrotator cuff-derived cells

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Area of Science:

  • Orthopaedic Research
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Tendon-bone junction regeneration is crucial for rotator cuff repair.
  • Current methods often result in suboptimal healing and mechanical strength.
  • Cell sheet technology offers a novel approach for biological regeneration.

Purpose of the Study:

  • To evaluate the efficacy of human rotator-cuff derived cell sheets in promoting biological regeneration of tendon-bone junctions.
  • To assess the impact of cell sheets on cartilage formation, angiogenesis, and mechanical properties in a rat rotator cuff injury model.

Main Methods:

  • Human rotator-cuff derived cells were cultured into cell sheets using temperature-responsive plates.
  • Cell sheets were applied to repaired rotator cuff tendons in immunodeficient rats (sheet group) versus controls without cell sheets.
  • Histological, gene expression (VEGF, Col2, TeM), and biomechanical analyses were performed post-surgery.

Main Results:

  • The cell sheet group exhibited enhanced proteoglycan deposition, increased type II collagen, and more isolectin B4 positive cells at the enthesis.
  • Angiogenesis was confirmed by the presence of human-specific CD31 positive cells exclusively in the sheet group.
  • Significantly higher ultimate failure load was observed in the cell sheet group at 8 weeks.

Conclusions:

  • Rotator-cuff derived cell sheets effectively promote cartilage regeneration and angiogenesis at the tendon-bone junction.
  • Cell sheet application results in superior mechanical strength compared to conventional repair methods.
  • This cell sheet-based treatment represents a promising strategy for tendon tissue engineering in rotator cuff injuries.