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Updated: Mar 20, 2026
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Simultaneous Assessment of Cardiomyocyte DNA Synthesis and Ploidy: A Method to Assist Quantification of Cardiomyocyte Regeneration and Turnover
Published on: May 23, 2016
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Postnatal telomere dysfunction induces cardiomyocyte cell-cycle arrest through p21 activation
Esther Aix1, Óscar Gutiérrez-Gutiérrez1, Carlota Sánchez-Ferrer1
1Centro Nacional de Investigaciones Cardiovasculares Carlos III, 28029 Madrid, Spain.
The Journal of Cell Biology
|June 1, 2016
Summary
Telomere dysfunction signals mammalian cardiomyocytes to exit the cell cycle after birth. Restoring cardiomyocyte proliferation in telomere-dysfunctional mice by inhibiting p21 suggests potential heart regeneration strategies.
Area of Science:
- Cardiovascular Biology
- Cellular Aging
- Molecular Cardiology
Background:
- Mammalian cardiomyocyte cell-cycle exit post-birth is poorly understood.
- Identifying triggers for cardiomyocyte proliferation arrest is crucial for cardiac repair.
Purpose of the Study:
- To investigate the role of telomere dysfunction in cardiomyocyte cell-cycle arrest.
- To explore therapeutic targets for enhancing cardiac regeneration.
Main Methods:
- Assessed telomerase activity and telomere length in wild-type and telomerase-deficient (G3 Terc(-/-)) mouse hearts.
- Examined cell-cycle markers (p21) and telomere integrity.
- Investigated cardiomyocyte proliferation after cardiac injury in G3 Terc(-/-) and G3 Terc(-/-)/p21(-/-) mice.
Main Results:
- Telomere length and telomerase activity decrease post-birth in wild-type mice, leading to telomere dysfunction and cell-cycle arrest.
- Premature telomere dysfunction in G3 Terc(-/-) mice caused precocious cell-cycle arrest, p21 up-regulation, and binucleation.
- Loss of cardiomyocyte proliferation after injury in G3 Terc(-/-) newborns was rescued in G3 Terc(-/-)/p21(-/-) mice.
Conclusions:
- Telomere dysfunction is a critical signal for cardiomyocyte cell-cycle arrest after birth.
- Targeting p21 may offer a strategy to enhance mammalian heart regeneration.
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