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Simultaneous Assessment of Cardiomyocyte DNA Synthesis and Ploidy: A Method to Assist Quantification of Cardiomyocyte Regeneration and Turnover
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The oxygen-rich postnatal environment induces cardiomyocyte cell-cycle arrest through DNA damage response.

Bao N Puente1, Wataru Kimura2, Shalini A Muralidhar2

  • 1Department of Internal Medicine, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA; Department of Pediatrics, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

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Summary
This summary is machine-generated.

The transition to oxygen after birth triggers cell-cycle arrest in heart cells (cardiomyocytes) via reactive oxygen species. Reducing oxidative stress may enhance heart regeneration therapies.

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Area of Science:

  • Cardiovascular Biology
  • Cellular Regeneration
  • Neonatal Physiology

Background:

  • Mammalian hearts possess limited regenerative capacity post-birth.
  • Cardiomyocytes exit the cell cycle shortly after birth, ceasing proliferation.
  • The trigger for this permanent cell-cycle exit remains largely unknown.

Purpose of the Study:

  • To identify the primary postnatal event causing cardiomyocyte cell-cycle arrest.
  • To investigate the role of the oxygen-rich postnatal environment as an upstream signal.
  • To explore the mechanisms linking oxygen exposure to cell-cycle exit.

Main Methods:

  • Quantification of reactive oxygen species (ROS) and oxidative DNA damage markers in neonatal hearts.
  • Assessment of DNA damage response (DDR) markers during the first postnatal week.
  • Experimental manipulation of oxygen levels (hypoxemia, hyperoxemia), ROS scavenging, and DDR inhibition in vivo.

Main Results:

  • Significant increases in ROS, oxidative DNA damage, and DDR markers were observed in the first postnatal week.
  • Postnatal hypoxemia, ROS scavenging, or DDR inhibition extended the cardiomyocyte proliferative window.
  • Hyperoxemia and ROS generators accelerated cardiomyocyte cell-cycle arrest.

Conclusions:

  • Transition to an oxygen-rich environment is a key signal for cardiomyocyte cell-cycle arrest.
  • ROS and subsequent DNA damage trigger a protective mechanism for cell-cycle exit.
  • Reducing mitochondrial-dependent oxidative stress is crucial for developing cardiomyocyte proliferation therapies.