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Related Experiment Video

Updated: Oct 10, 2025

Assessing Cardiomyocyte Subtypes Following Transcription Factor-mediated Reprogramming of Mouse Embryonic Fibroblasts
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Polyploid cardiomyocytes: implications for heart regeneration.

Anna Kirillova1, Lu Han2,3, Honghai Liu2,3

  • 1Medical Scientist Training Program, University of Pittsburgh and Carnegie Mellon University, Pittsburgh, PA 15219, USA.

Development (Cambridge, England)
|December 13, 2021
PubMed
Summary

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Sequential changes in calcium transients during M phase regulate cardiomyocyte proliferation.

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Interdependent changes of nuclear lamins, nuclear pore complexes, and ploidy regulate cellular regeneration and stress response in the heart.

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Single Nucleotide Polymorphism rs9277336 Controls the Nuclear Alpha Actinin 4-Human Leukocyte Antigen-DPA1 Axis and Pulmonary Endothelial Pathophenotypes in Pulmonary Arterial Hypertension.

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This summary is machine-generated.

Terminally differentiated cells, like cardiomyocytes, can be polyploid, possessing multiple genome copies. Understanding how these polyploid cells form may unlock new strategies for cardiac regeneration.

Area of Science:

  • Cell Biology
  • Cardiovascular Science
  • Regenerative Medicine

Background:

  • Terminally differentiated cells are typically considered to have finalized their form and function.
  • Many terminally differentiated cells, including mammalian cardiomyocytes (heart muscle cells), are polyploid, possessing multiple copies of the diploid genome.
  • These cardiomyocytes can be bi- or multi-nucleated or have polyploid nuclei.

Purpose of the Study:

  • To present the mechanisms that generate bi- and multi-nucleated cardiomyocytes.
  • To elucidate the mechanisms responsible for generating polyploid nuclei in cardiomyocytes.
  • To hypothesize how these mechanisms influence cardiomyocyte proliferation and cardiac regeneration.

Main Methods:

  • Review of recent mechanistic studies on cardiomyocyte polyploidization.
Keywords:
CardiomyocytesCytokinesisDifferentiationKaryokinesisPloidyRegeneration

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  • Analysis of mechanisms generating multinucleation and polyploid nuclei.
  • Comparative discussion with other polyploid cell types, including cancer cells.

    • Main Results:

    • Polyploid cardiomyocytes, characterized by multiple nuclei or increased DNA content, are common in mammals.
    • Mechanisms exist for generating both multinucleated and polyploid nuclei in cardiomyocytes.
    • These polyploidization processes are implicated in limiting cardiomyocyte proliferation and thus, heart regeneration.

    Conclusions:

    • Understanding the generation of polyploid cardiomyocytes is crucial for advancing cardiac regeneration research.
    • Mechanisms of cardiomyocyte polyploidization may offer therapeutic targets for enhancing heart repair.
    • Insights from cardiomyocyte polyploidy can inform studies on other polyploid cells, such as cancer cells.