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Inhibiting fatty-acid utilization in neonatal hearts extends the window for cardiomyocyte proliferation. This approach, by reducing reactive oxygen species and DNA damage, shows promise for cardiac regeneration therapies.

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Area of Science:

  • Cardiology
  • Developmental Biology
  • Metabolic Regulation

Background:

  • Neonatal mammalian hearts possess a limited regenerative capacity.
  • This capacity is lost within the first week post-birth, coinciding with a metabolic shift from glycolysis to fatty-acid oxidation.
  • Fatty-acid oxidation increases reactive oxygen species (ROS), inducing DNA damage and cardiomyocyte cell-cycle arrest via the DNA-damage response (DDR) pathway.

Purpose of the Study:

  • To investigate the role of fatty-acid utilization in limiting neonatal cardiac regeneration.
  • To determine if inhibiting fatty-acid oxidation can promote cardiomyocyte proliferation and improve cardiac function post-injury.

Main Methods:

  • Neonatal mice were fed fatty-acid deficient milk to assess effects on proliferation.
  • A tamoxifen-inducible cardiomyocyte-specific pyruvate dehydrogenase kinase 4 (PDK4) knockout mouse model was generated.
  • PDK4 deletion was used to enhance glucose oxidation over fatty-acid oxidation in cardiomyocytes.

Main Results:

  • Inhibition of fatty-acid utilization prolonged the cardiomyocyte proliferative window.
  • PDK4 knockout led to increased pyruvate dehydrogenase activity, favoring glucose oxidation.
  • Loss of PDK4 decreased cardiomyocyte size, DNA damage, and DDR markers, while increasing proliferation.
  • Inducible PDK4 deletion improved cardiac function and reduced remodeling after myocardial infarction.

Conclusions:

  • Inhibiting fatty-acid utilization in cardiomyocytes promotes proliferation.
  • Reducing reliance on fatty acids may be a therapeutic strategy for cardiac regeneration.
  • Targeting PDK4 offers a potential avenue for developing novel cardiac repair therapies.