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Related Experiment Videos

Apoptosis in rotator cuff tendonopathy.

Jun Yuan1, George A C Murrell, Ai-Qun Wei

  • 1Orthopaedic Research Institute, St George Hospital Campus, 4-10 South Street, University of New, South Wales, Sydney, NSW 2217, Australia.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|December 11, 2002
PubMed
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This study reveals excessive apoptosis, or programmed cell death, in rotator cuff tendons, suggesting its key role in rotator cuff degeneration. These findings highlight apoptosis as a significant factor in the pathogenesis of these common shoulder disorders.

Area of Science:

  • Orthopedics
  • Cell Biology
  • Pathology

Background:

  • Rotator cuff disorders are a common cause of shoulder pain and dysfunction.
  • The underlying mechanisms of rotator cuff degeneration are not fully understood.
  • Apoptosis (programmed cell death) is a cellular process implicated in various degenerative conditions.

Purpose of the Study:

  • To investigate the role of apoptosis in the pathogenesis of rotator cuff disorders.
  • To quantify the levels of apoptosis in human rotator cuff tendons.

Main Methods:

  • Collected supraspinatus tendon samples from patients with rotator cuff tears (n=25) and subscapularis tendons from controls (n=6).
  • Utilized in situ DNA end labeling and DNA laddering assays to detect and quantify apoptosis.

Related Experiment Videos

  • Employed immunohistochemical staining to identify apoptotic cells.

    • Main Results:

    • Degenerative rotator cuff tendons exhibited significant mucoid degeneration with numerous apoptotic cells.
    • The percentage of apoptotic cells was significantly higher in degenerative rotator cuff tissue (34%) compared to controls (13%) (p < 0.001).
    • Apoptotic cells were primarily fibroblast-like cells within the degenerated tendon tissue.

    Conclusions:

    • This study provides the first evidence of excessive apoptosis in degenerating rotator cuff tendons.
    • Apoptosis appears to play a significant role in the pathogenesis of rotator cuff degeneration.
    • Targeting apoptosis may offer a potential therapeutic strategy for rotator cuff disorders.