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Murine Flexor Tendon Injury and Repair Surgery
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A Combination of Oxo-M and 4-PPBP as a potential regenerative therapeutics for tendon injury

Solaiman Tarafder1, Christopher Ricupero1, Sumeet Minhas1

  • 1Columbia University College of Dental Medicine, 630 W. 168th street, Vanderbilt Clinic 12-210, New York, NY 10032.

Theranostics
|July 9, 2019
PubMed

Insights

Small molecules Oxo-M and 4-PPBP activate tendon stem cells (TSCs) for enhanced tendon regeneration. This approach promotes functional healing and collagen reorganization in tendon injuries.

Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Musculoskeletal Research

Background:

  • Tendon injuries often lead to scar tissue, impairing biochemical and mechanical properties.
  • CD146+ perivascular tendon stem/progenitor cells (TSCs) are crucial for tendon healing.
  • Current treatments lack effective strategies for true tendon regeneration.

Purpose of the Study:

  • To identify small molecules that selectively activate endogenous TSCs for tendon regeneration.
  • To investigate the therapeutic potential of Oxo-M and 4-PPBP in tendon healing.
  • To elucidate the specific signaling pathways involved in TSC activation.

Main Methods:

  • Screening of ERK1/2 and FAK agonists to identify Oxo-M and 4-PPBP.
  • In vitro assessment of tenogenic differentiation of TSCs.
  • In vivo evaluation of tendon healing in a rat patellar tendon transection model using PLGA microsphere delivery.
  • Signaling pathway analysis to determine the mechanism of TSC targeting.

Main Results:

  • Oxo-M and 4-PPBP synergistically upregulated tendon-related gene markers in TSCs.
  • Controlled delivery of Oxo-M and 4-PPBP significantly improved healing of transected rat patellar tendons.
  • Enhanced functional restoration and collagenous structure reorganization were observed in treated tendons.
  • Signaling studies indicated specific targeting of CD146+ TSCs via muscarinic acetylcholine receptors (AChR) and sigma-1 (σ1) receptors.

Conclusions:

  • Oxo-M and 4-PPBP show significant potential as regenerative therapeutics for tendon injuries.
  • Targeted activation of endogenous TSCs offers a promising strategy for tendon repair.
  • The identified small molecules and their specific targeting mechanisms provide a novel therapeutic avenue.
Keywords:
Endogenous stem/progenitor cellsRegenerative MedicineSmall moleculesTendon

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