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Calcineurin Links Mitochondrial Elongation with Energy Metabolism

Paul T Pfluger1, Dhiraj G Kabra1, Michaela Aichler2

  • 1Helmholtz Diabetes Center, Helmholtz Zentrum München, 85764 Neuherberg, Germany.

Cell Metabolism
|September 29, 2015
PubMed

Insights

Calcineurin signaling regulates body weight and energy balance. This conserved pathway impacts metabolism in response to diet and exercise, offering insights into obesity and metabolic disease.

Area of Science:

  • Cellular signaling pathways
  • Metabolic regulation
  • Physiological homeostasis

Background:

  • Canonical protein phosphatase 3/calcineurin signaling is crucial for many physiological functions.
  • Its role in systemic energy and body weight homeostasis is not fully understood.

Purpose of the Study:

  • To investigate the role of calcineurin in controlling systemic energy and body weight homeostasis.
  • To explore calcineurin's impact on metabolic adaptation to environmental changes.

Main Methods:

  • Calcineurin knockdown in Drosophila melanogaster.
  • Genetic deficiency of Ppp3cb and tissue-specific ablation of Ppp3r1 in mice.
  • Analysis of body weight, energy stores, energy expenditure, and mitochondrial function.

Main Results:

  • Calcineurin knockdown in flies decreased body weight and energy stores, increasing energy expenditure.
  • Mice with calcineurin deficiency (Ppp3cb global knockout or Ppp3r1 skeletal muscle-specific knockout) were protected from diet-induced obesity.
  • Skeletal muscle mitochondrial hyperphosphorylation of Drp1 was linked to altered mitochondrial morphology and respiration, but reduced exercise performance.

Conclusions:

  • Calcineurin is a conserved regulator of systemic energy and body weight homeostasis.
  • Calcineurin plays a pivotal role in adaptive metabolic responses to dietary challenges and exercise.
  • Targeting calcineurin signaling may offer therapeutic strategies for obesity and metabolic disorders.

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