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Titin-based mechanosensing modulates muscle hypertrophy.

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Area of Science:

  • Muscle physiology
  • Sarcomeric protein mechanics
  • Skeletal muscle biology

Background:

  • Titin is an elastic sarcomeric filament implicated in muscle mechanosensing and trophicity.
  • Direct experimental evidence for titin's role in mechanosensing is limited.
  • Novel in vivo models are needed to investigate titin's function in muscle adaptation.

Purpose of the Study:

  • To investigate the role of titin stiffness in regulating muscle hypertrophy.
  • To establish a direct link between titin's mechanosensory function and muscle trophicity.
  • To utilize a novel in vivo model for studying muscle adaptation.

Main Methods:

  • Unilateral diaphragm denervation (UDD) in mice to induce passive stretch and hypertrophy.
  • Utilized wildtype, RBM20ΔRRM (reduced titin stiffness), and TtnΔIAjxn (increased titin stiffness) mouse models.
  • Analyzed changes in hemidiaphragm mass and protein expression following UDD.

Main Results:

  • UDD induced significant hemidiaphragm hypertrophy in wildtype mice.
  • Reduced titin stiffness (RBM20ΔRRM) attenuated hypertrophy, while increased stiffness (TtnΔIAjxn) exaggerated it.
  • Muscle hypertrophy was found to scale directly with titin stiffness.
  • UDD induced expression of titin-binding proteins involved in muscle trophicity (MARP1 & 2, FHL1, MuRF1).

Conclusions:

  • Titin functions as a critical mechanosensor in skeletal muscle.
  • Titin stiffness directly modulates the adaptive hypertrophy response.
  • Titin plays a key role in regulating muscle trophicity through mechanosensing.