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Glutamine prevents myostatin hyperexpression and protein hypercatabolism induced in C2C12 myotubes by tumor necrosis

Andrea Bonetto1, Fabio Penna, Valerio G Minero

  • 1Department of Experimental Medicine and Oncology, University of Torino, Corso Raffaello, 30, 10125, Turin, Italy.

Amino Acids
|July 13, 2010
PubMed

Insights

Tumor necrosis factor-alpha (TNFα) triggers muscle protein loss by increasing myostatin expression and activating proteolytic systems. Glutamine supplementation can prevent this muscle wasting, suggesting amino acids may help preserve muscle mass.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Physiology

Background:

  • Skeletal muscle protein depletion is primarily driven by increased protein breakdown via proteolytic systems.
  • Myostatin, a key regulator of muscle mass, shows enhanced expression in pathologies causing muscle wasting.
  • Tumor necrosis factor-alpha (TNFα) is a pro-catabolic mediator implicated in muscle hypercatabolism.

Purpose of the Study:

  • To investigate TNFα's role in regulating myostatin expression and muscle protein catabolism.
  • To explore the potential of amino acid supplementation to counteract TNFα-induced muscle protein loss.

Main Methods:

  • Utilized C2C12 myotubes as an in vitro model.
  • Exposed myotubes to TNFα with or without glutamine or leucine supplementation.
  • Assessed atrogin-1 expression, Ca2+-dependent proteolysis, and myostatin levels.

Main Results:

  • TNFα treatment upregulated atrogin-1 and enhanced Ca2+-dependent proteolysis in myotubes.
  • TNFα exposure led to increased myostatin expression.
  • Glutamine supplementation effectively prevented TNFα-induced muscle protein loss and normalized myostatin levels.

Conclusions:

  • TNFα directly contributes to muscle protein loss and disrupts myostatin signaling.
  • Amino acid supplementation, particularly glutamine, shows promise in preventing muscle wasting.
  • This suggests a potential therapeutic strategy for preserving muscle mass in catabolic conditions.

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