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The transcriptional coregulators TIF2 and SRC-1 regulate energy homeostasis by modulating mitochondrial respiration

Delphine Duteil1, Céline Chambon, Faisal Ali

  • 1Department of Physiological Genetics, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France.

Cell Metabolism
|November 2, 2010
PubMed

Insights

Mice lacking TIF2 in skeletal muscle showed improved metabolic health. This suggests targeting transcriptional coregulators like TIF2 and SRC-1 could treat metabolic disorders.

Area of Science:

  • Metabolic regulation
  • Adipose tissue biology
  • Skeletal muscle physiology

Background:

  • Transcriptional coregulators SRC-1 and TIF2 are key regulators of metabolism in adipose tissue and liver.
  • Their specific roles in skeletal muscle are not fully understood.

Purpose of the Study:

  • To investigate the cell-autonomous functions of TIF2 in adult skeletal muscle.
  • To determine the impact of TIF2 ablation in skeletal muscle on metabolic health and response to environmental stressors.

Main Methods:

  • Generation of TIF2((i)skm)⁻(/)⁻ mice with selective TIF2 ablation in skeletal muscle myofibers.
  • Assessment of mitochondrial function, oxidative capacity, and metabolic parameters under conditions of sedentariness and high-caloric diet.

Main Results:

  • Skeletal muscle-specific TIF2 deficiency led to increased mitochondrial uncoupling.
  • These mice exhibited protection against reduced muscle oxidative capacity, delayed type 2 diabetes onset, and attenuated diet-induced obesity.
  • SRC-1 and TIF2 antagonistically regulate uncoupling protein 3 (UCP3) expression, with elevated SRC-1 in TIF2-deficient muscle contributing to metabolic adaptations.

Conclusions:

  • TIF2 plays a critical role in maintaining skeletal muscle metabolic homeostasis.
  • Modulating SRC-1 and TIF2 activity offers a potential therapeutic strategy for metabolic disorders like type 2 diabetes and obesity.

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