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Myocardial mitochondrial dysfunction in mice lacking adiponectin receptor 1.

Christoph Koentges1, Alexandra König, Katharina Pfeil

  • 1Division of Cardiology and Angiology I, Heart Center Freiburg University, Hugstetter Str. 55, 79106, Freiburg, Germany.

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Adiponectin receptor 1 (AdipoR1) deficiency impairs heart mitochondrial function and efficiency, suggesting its role in Type 2 diabetes. AdipoR1 is crucial for maintaining cardiac mitochondrial health.

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Area of Science:

  • Cardiovascular Biology
  • Metabolic Disease Research
  • Mitochondrial Medicine

Background:

  • Hypoadiponectinemia is linked to cardiovascular disease and Type 2 diabetes.
  • Adiponectin levels influence myocardial mitochondrial function in diabetes models.

Purpose of the Study:

  • To investigate the roles of adiponectin receptors (AdipoR1 and AdipoR2) in regulating cardiac mitochondrial function.
  • To understand AdipoR1's specific contribution to adiponectin's effects on the heart.

Main Methods:

  • Utilized isolated working hearts from mice genetically deficient in AdipoR1 or AdipoR2.
  • Assessed myocardial oxygen consumption, cardiac efficiency, oxidative phosphorylation (OXPHOS) complex activities, and key signaling pathways.
  • Investigated mitochondrial uncoupling and oxidative stress markers.

Main Results:

  • AdipoR1 deficiency reduced cardiac efficiency and impaired mitochondrial oxidative phosphorylation (OXPHOS) complex activities.
  • Signaling pathways including AMPK, Sirtuin 1, and PGC-1α were diminished in AdipoR1-deficient hearts.
  • Mitochondrial uncoupling and increased oxidative stress (4-hydroxynonenal) were observed in AdipoR1-deficient mice.
  • AdipoR2 deficiency did not affect cardiac mitochondrial function.

Conclusions:

  • Adiponectin receptor 1 (AdipoR1) is essential for maintaining normal myocardial mitochondrial function and coupling.
  • Impaired AdipoR1 signaling may contribute to mitochondrial dysfunction and uncoupling in the context of Type 2 diabetes.