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Related Experiment Videos

Euglycemic hyperinsulinemia and hyperaminoacidemia decrease skeletal muscle ubiquitin mRNA in goats

D Larbaud1, E Debras, D Taillandier

  • 1Centre de Recherche en Nutrition Humaine, Unité d'Etude du Métabolisme Azoté, Ceyrat, France.

The American Journal of Physiology
|September 1, 1996
PubMed
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Insulin reduces protein breakdown by decreasing ubiquitin mRNA in skeletal muscle. This finding in goats suggests a key mechanism for insulin's whole-body antiproteolytic effect, without impacting other tissues.

Area of Science:

  • Metabolic Regulation
  • Molecular Biology
  • Animal Physiology

Background:

  • Insulin is known to inhibit whole-body protein breakdown.
  • The specific tissues and proteolytic pathways affected by insulin's antiproteolytic action remain unclear.
  • Understanding these mechanisms is crucial for metabolic research.

Purpose of the Study:

  • To investigate the impact of insulin on specific proteolytic pathway components in various tissues.
  • To identify the tissues and molecular pathways through which insulin exerts its protein breakdown inhibition.
  • To elucidate the role of ubiquitin-dependent proteolysis in insulin's effect.

Main Methods:

  • A 6-hour hyperinsulinemic, euglycemic, and hyperaminoacidemic clamp was performed in goats.

Related Experiment Videos

  • mRNA levels for cathepsin D, m-calpain, and ubiquitin were measured in skeletal muscle, skin, liver, and intestine.
  • Goats were used due to their known response to insulin-induced inhibition of protein breakdown.

    • Main Results:

    • Insulin treatment did not alter mRNA levels of cathepsin D, m-calpain, or ubiquitin in the liver, skin, or jejunum.
    • A significant decrease in ubiquitin mRNA levels was observed in skeletal muscle.
    • No concurrent reduction in mRNA for cathepsin D, m-calpain, or other ubiquitin-proteolysis pathway components was found in skeletal muscle.

    Conclusions:

    • Insulin's antiproteolytic effect in vivo may be partly explained by reduced ubiquitin mRNA levels in skeletal muscle.
    • This study highlights skeletal muscle as a key tissue mediating insulin's protein breakdown inhibition.
    • The findings point towards the ubiquitin-dependent proteolytic pathway as a target of insulin's action.