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Applying a Three-dimensional Uniaxial Mechanical Stimulation Bioreactor System to Induce Tenogenic Differentiation of Tendon-Derived Stem Cells
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Tendon-Derived Stem Cell Differentiation in the Degenerative Tendon Microenvironment.

Chang Liu1,2, Jing-Wan Luo1, Ke-Ke Zhang1

  • 1Center for Translational Medicine Research and Development, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518000, China.

Stem Cells International
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The degenerative tendon microenvironment prompts tendon-derived stem cells (TDSCs) to transform into bone and cartilage cells. This occurs due to altered cell shape and reduced FAK/ERK1/2 signaling in tendinopathy.

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Orthopedics

Background:

  • Tendinopathy pathogenesis is unclear, with tendon-derived stem cells (TDSCs) implicated.
  • The differentiation pathways of TDSCs in a degenerative tendon environment are not well understood.

Purpose of the Study:

  • To investigate how the degenerative tendon microenvironment regulates TDSC differentiation.
  • To explore the molecular mechanisms underlying TDSC fate in tendinopathy.

Main Methods:

  • Isolated TDSCs from rat Achilles tendons and cultured them on normal and degenerative decellularized tendon slices (DTSs).
  • Utilized immunofluorescence, H&E staining, real-time PCR, and Western blot to analyze TDSC morphology and differentiation markers.
  • Assessed the activation of FAK and ERK1/2 signaling pathways.

Main Results:

  • TDSCs exhibited increased spreading on degenerative DTSs compared to normal DTSs.
  • Expression of tenocyte markers (COL1, TNMD) was lower on degenerative DTSs.
  • Expression of chondrogenic (COL2, SOX9) and osteogenic (Runx2, ALP) markers was higher on degenerative DTSs.
  • Reduced phosphorylation of FAK and ERK1/2 was observed on degenerative DTSs.

Conclusions:

  • The degenerative tendon microenvironment induces TDSCs to differentiate into chondrogenic and osteogenic lineages.
  • Altered TDSC morphology and reduced FAK/ERK1/2 activation contribute to this differentiation in tendinopathy.