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Related Concept Videos

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Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
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Related Experiment Video

Updated: Jun 19, 2025

Development of a Rabbit Chronic-Like Rotator Cuff Injury Model for Study of Fibrosis and Muscular Fatty Degeneration
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Satellite myoblast and mesenchymal stem cell injections decrease fatty degeneration after rotator cuff tear in rats.

Tahir Koray Yozgatli1, Elif Gelenli Dolanbay2, Tunca Cingoz1

  • 1Department of Orthopedic Surgery Acibadem University Faculty of Medicine Istanbul Turkey.

Journal of Experimental Orthopaedics
|July 25, 2024
PubMed
Summary

Surgical repair combined with satellite myoblasts (SM) and mesenchymal stem cells (MSCs) injections effectively treated chronic rotator cuff tears in rats. This approach improved muscle mass and reduced fatty degeneration, promoting better tendon healing and muscle regeneration.

Keywords:
fatty degenerationrotator cuffstem cell therapysurgical repair

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Isolation, Culture, and Transplantation of Muscle Satellite Cells
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Area of Science:

  • Orthopedics
  • Regenerative Medicine
  • Stem Cell Therapy

Background:

  • Rotator cuff tears often lead to fatty degeneration, which surgical repair alone cannot reverse.
  • Delayed treatment exacerbates fatty degeneration in rotator cuff tears.
  • Current surgical methods may not fully restore function after rotator cuff tears due to persistent fatty degeneration.

Purpose of the Study:

  • To evaluate the efficacy of local injections of satellite myoblasts (SM) and mesenchymal stem cells (MSCs) in stimulating myogenesis and reducing adipogenesis in a rat model of chronic rotator cuff tears.
  • To determine if combining stem cell therapy with surgical repair can reverse fatty degeneration associated with rotator cuff tears.

Main Methods:

  • A standardized rotator cuff tear model was created in 24 Wistar albino rats.
  • Animals were divided into two groups: surgical repair plus SM and MSC injections (n=12) and surgical repair only (n=12).
  • Injections were administered at weeks 8, 9, and 10 post-initial surgery, with follow-up until week 14.

Main Results:

  • The group receiving surgical repair with SM and MSC injections showed significantly greater supraspinatus muscle mass compared to the repair-only and control groups.
  • Adipose tissue ratio was significantly lower in the repair + SM and MSC group than in the repair-only and control groups.
  • Histological analysis revealed improved muscle and tendon organization in the repair + SM and MSC group.

Conclusions:

  • Surgical repair combined with SM and MSC injections is a promising treatment for chronic rotator cuff tears.
  • This combined approach effectively improves fatty degeneration, enhances tendon healing, and stimulates myogenesis in a rat model.
  • Stem cell-based therapy offers a potential strategy to reverse the degenerative changes associated with rotator cuff tears.