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Mechanical force regulates Sox9 expression at the developing enthesis.

Arul Subramanian1, Lauren F Kanzaki1, Thomas F Schilling1

  • 1Department of Developmental and Cell Biology, University of California, Irvine, CA 92697, USA.

Development (Cambridge, England)
|July 27, 2023
PubMed
Summary
This summary is machine-generated.

Muscle contraction force balances scleraxis (Scx) and Sox9 transcription factors in tenocytes. This balance controls specialized extracellular matrix (ECM) organization for effective force transmission at tendon entheses.

Keywords:
EnthesisMechanotransductionTendonTenocyte differentiationZebrafish

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Area of Science:

  • Biochemistry
  • Developmental Biology
  • Musculoskeletal Biology

Background:

  • Entheses are crucial skeletal insertion sites for tendons and ligaments.
  • Extracellular matrix (ECM) organization at entheses dictates mechanical properties for force transmission.
  • Transcription factors scleraxis (Scx) and Sox9 are key regulators of enthesis ECM production.

Purpose of the Study:

  • To investigate the role of muscle contraction force in regulating entheseal tenocyte transcription factors Scx and Sox9.
  • To elucidate how the balance of Scx and Sox9 expression influences enthesis ECM organization and force transmission.
  • To determine the involvement of TGF-β signaling in maintaining this transcriptional balance.

Main Methods:

  • Zebrafish embryo model to study craniofacial enthesis development.
  • Quantitative analysis of scxa and sox9a mRNA levels in entheseal tenocytes.
  • Pharmacological inhibition of muscle contraction using paralysis.
  • Assessment of collagen type I alpha 1 (Col1a1) transcription.
  • Investigation of TGF-β signaling pathways.

Main Results:

  • Dynamic changes in scxa and sox9a mRNA levels correlate with tenocyte function in force transmission.
  • The ratio of scxa to sox9a expression regulates transcription of Col1a1, an ECM component.
  • Muscle paralysis during development disrupts the scxa/sox9a balance, increasing sox9a expression.
  • Force-dependent TGF-β signaling is essential for maintaining the balance of scxa and sox9a expression.

Conclusions:

  • Muscle contraction force is a critical regulator of the Scx/Sox9 transcriptional balance in entheseal tenocytes.
  • This balance dictates the specialized ECM organization required for efficient force transmission.
  • TGF-β signaling mediates the force-dependent regulation of enthesis development and function.