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Flexor tendon healing in the rat: a histologic and gene expression study
Wataru Oshiro1, Jueren Lou, Xiaoyun Xing
1Department of Orthopaedic Surgery, Barnes-Jewish Hospital, Washington University, St Louis, MO 63110, USA.
The Journal of Hand Surgery
|September 26, 2003
Summary
This study developed a rat model for flexor tendon healing, revealing matrix metalloproteinases (MMPs) roles. MMP-9 and MMP-13 aid collagen breakdown, while MMP-2, MMP-3, and MMP-14 also remodel collagen.
Area of Science:
- Biomedical Engineering
- Molecular Biology
- Orthopedic Research
Background:
- Tendon healing is a complex process involving degradation and remodeling.
- Understanding the molecular mechanisms is crucial for developing effective treatments.
Purpose of the Study:
- Establish a reliable rat flexor tendon laceration and repair model.
- Investigate the molecular mechanisms, particularly collagen and matrix metalloproteinase (MMP) gene expression, during tendon healing.
Main Methods:
- Surgical repair of rat flexor digitorum longus tendons.
- Histologic analysis of repaired tendons over 84 days.
- Gene expression analysis of collagens and MMPs over 28 days.
Main Results:
- Histology showed collagen degradation (days 7-21) and new fiber formation by day 28, with remodeling until day 84.
- Type I collagen decreased then recovered by day 28; types III, V, and XII collagen increased.
- MMP-9 and MMP-13 peaked early (days 7-14), while MMP-2, MMP-3, and MMP-14 increased and remained elevated until day 28.
Conclusions:
- The rat model effectively represents the complete tendon healing process.
- MMP-9 and MMP-13 are primarily involved in collagen degradation.
- MMP-2, MMP-3, and MMP-14 play dual roles in both collagen degradation and remodeling.