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Development of a Rabbit Chronic-Like Rotator Cuff Injury Model for Study of Fibrosis and Muscular Fatty Degeneration
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Muscle gene expression patterns in human rotator cuff pathology.

Alexander Choo1, Meagan McCarthy1, Rajeswari Pichika1

  • 1Departments of Orthopaedic Surgery (A.C., M.M., R.P., S.S., and J.G.L.), Bioengineering (E.J.S. and R.L.L.), and Radiology (S.R.W.), University of California San Diego, 9500 Gilman Drive (0610), La Jolla, CA 92093. E-mail address for S.R. Ward: srward@ucsd.edu.

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Summary

Rotator cuff tear severity impacts muscle gene expression. Full-thickness tears show fibrosis and fat, while massive tears downregulate muscle-building genes, complicating treatment.

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Area of Science:

  • Orthopedics
  • Molecular Biology
  • Regenerative Medicine

Background:

  • Rotator cuff pathology is a frequent cause of shoulder pain.
  • Muscle degeneration (fatty infiltration, atrophy, fibrosis) negatively affects surgical outcomes.
  • Understanding gene expression changes is crucial for rotator cuff repair success.

Purpose of the Study:

  • To quantify gene expression related to muscle growth, fat development, and fibrosis in human rotator cuff muscles.
  • To compare gene expression across different rotator cuff tear severities.

Main Methods:

  • Supraspinatus muscle biopsies from 27 patients (bursitis, tendinopathy, full-thickness tear, massive tear).
  • Quantitative polymerase chain reaction (qPCR) to analyze gene expression pathways.
  • Assessment of myogenic, adipogenic, and fibrogenic gene expression.

Main Results:

  • Massive tears showed reduced expression of genes for muscle building, fat development, and fibrosis.
  • Full-thickness tears exhibited increased fibrotic and adipogenic gene expression.
  • Bursitis and tendinopathy groups maintained expression of muscle-building genes.

Conclusions:

  • Rotator cuff muscle gene expression varies significantly with tear severity.
  • Full-thickness tears are linked to detrimental fatty atrophy and fibrosis.
  • Massive tears display inhibited muscle-building pathways, suggesting challenges in recovery and highlighting the importance of early intervention.