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Muscle composition is regulated by a Lox-TGFβ feedback loop.

Liora Kutchuk1, Anu Laitala2, Sharon Soueid-Bomgarten1

  • 1The Rappaport Faculty of Medicine and Research Institute, Technion - Israel Institute of Technology, Haifa 31096, Israel.

Development (Cambridge, England)
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Summary

Lysyl oxidase (Lox) deletion disrupts muscle tissue balance. A feedback loop between myofibers and connective tissue involving Lox and TGFβ signaling is crucial for muscle development and organization.

Keywords:
CollagenLysyl oxidaseMouseMuscleMuscle connective tissueTGF-beta

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Area of Science:

  • Muscle biology
  • Extracellular matrix dynamics
  • Developmental biology

Background:

  • Muscle tissue comprises diverse cells and extracellular matrix, with limited understanding of their intercellular communication during development.
  • Lysyl oxidase (Lox) is an extracellular enzyme critical for collagen maturation and tissue organization.

Purpose of the Study:

  • To investigate the role of lysyl oxidase (Lox) in regulating the balance between myofibers and muscle connective tissue (MCT).
  • To elucidate the crosstalk between myofibers and MCT involving Lox and TGFβ signaling during muscle development.

Main Methods:

  • Mice models with Lox deletion were used to analyze muscle tissue composition and signaling pathways.
  • Investigated the secretion of Lox from myofibers and its effect on TGFβ signaling.

Main Results:

  • Deletion of Lox disrupted the balance between myofibers and MCT.
  • Myofiber-secreted Lox attenuates TGFβ signaling, which normally promotes MCT development.
  • A feedback loop between TGFβ signaling and Lox maintains homeostasis and organization within muscle tissue.

Conclusions:

  • The TGFβ-Lox feedback loop is essential for maintaining developmental homeostasis and proper organization of muscle components.
  • Understanding this mechanism provides insights into muscle diseases like Duchenne muscular dystrophy.