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Matrix metabolism rate differs in functionally distinct tendons.

Helen L Birch1, Sarah Worboys, Sabry Eissa

  • 1Institute of Orthopaedics and Musculoskeletal Science, University College London, Stanmore Campus, Royal National Orthopaedic Hospital, Brockley Hill, Stanmore, HA7 4LP, UK. h.birch@ucl.ac.uk

Matrix Biology : Journal of the International Society for Matrix Biology
|November 23, 2007
PubMed
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Energy storing tendons like the equine superficial digital flexor tendon (SDFT) show slower collagen turnover than positional tendons. This reduced matrix turnover may increase degeneration risk and injury in these high-stress tendons.

Area of Science:

  • Biomechanical engineering
  • Veterinary orthopedics
  • Tendon physiology

Background:

  • Tendon matrix integrity is crucial for mechanical function.
  • Tendon matrix turnover is an active process, not inert.
  • Energy-storing tendons experience higher physiological stress than positional tendons.

Purpose of the Study:

  • To investigate differences in matrix turnover between energy-storing (equine SDFT) and positional (equine CDET) tendons.
  • To test the hypothesis that energy-storing tendons have higher matrix turnover due to micro-damage.
  • To compare collagen and non-collagenous protein expression and degradation markers.

Main Methods:

  • Assessed matrix age, degradation markers, and protein expression in equine SDFT and CDET.
  • Measured mRNA levels for collagen types I and III.

Related Experiment Videos

  • Quantified mRNA for matrix metalloproteinases (MMPs) and MMP protein activity.
  • Measured cross-linked carboxyterminal telopeptide of type I collagen (ICTP) and tissue fluorescence.

    • Main Results:

    • Equine SDFT had higher cellularity but lower mRNA for collagen types I and III compared to CDET.
    • CDET showed significantly higher mRNA levels for MMP1, MMP13, and higher MMP protein activity.
    • CDET exhibited higher ICTP levels and lower tissue fluorescence, indicating more rapid collagen turnover.

    Conclusions:

    • Positional tendons (CDET) demonstrate higher matrix degradation and turnover rates than energy-storing tendons (SDFT).
    • Reduced collagen turnover in SDFT may contribute to its higher susceptibility to degeneration and injury.
    • Findings suggest a link between matrix turnover rate and tendon injury risk in different functional roles.