Extra- and intracellular factors regulating cardiomyocyte proliferation in postnatal life

Area of Science:

• Cardiovascular Biology
• Regenerative Medicine
• Molecular Cardiology

Background:

• Mammalian adult cardiomyocytes have limited regenerative capacity post-injury, contrasting with embryonic hearts and other vertebrates.
• The molecular mechanisms preventing adult cardiomyocyte proliferation remain largely unknown.
• Extracellular molecules and signaling pathways are emerging as key regulators of cardiomyocyte cell cycle activity.

Purpose of the Study:

• To review current understanding of factors modulating cardiomyocyte proliferation.
• To highlight the potential of these factors in developing cardiac regeneration strategies.
• To discuss genetically defined pathways and microRNA networks influencing cardiomyocyte cell division.

Main Methods:

• Literature review of studies on cardiomyocyte proliferation.
• Analysis of research on growth factors, stem cells, and signaling pathways (e.g., Hippo pathway).
• Examination of microRNA's role in regulating cardiomyocyte cell cycle.

Main Results:

• Exogenous growth factors can induce proliferation in neonatal and sometimes adult cardiomyocytes.
• Diffusible factors influence the behavior of endogenous and transplanted stem cells for cardiac repair.
• Genetic pathways like Hippo and microRNA networks are critical for controlling postnatal cardiomyocyte proliferation.

Conclusions:

• Modulating cardiomyocyte proliferation via exogenous factors and intrinsic pathways is a promising avenue for cardiac regeneration.
• Identifying specific cytokines activating these pathways is crucial for clinical translation.
• Understanding paracrine control mechanisms is essential for future therapeutic development.