Exploring the Function of Epicardial Cells Beyond the Surface

Area of Science:

• Cardiovascular Biology
• Regenerative Medicine
• Developmental Biology

Background:

• The epicardium, once considered a passive layer, is now recognized for its vital roles in cardiac development, regeneration, and repair.
• Recent research highlights the epicardium's essential functions in highly regenerative animal models, influencing cardiomyocyte proliferation, fibrosis, and vascularization.

Purpose of the Study:

• To review the cellular and molecular characteristics of the epicardium.
• To explore the epicardium's role in heart regeneration and repair across different species.
• To examine emerging technologies for studying epicardial cell function and therapeutic potential.

Main Methods:

• Review of existing literature on epicardial biology and cardiac regeneration.
• Analysis of transcriptomic studies to understand epicardial heterogeneity.
• Examination of novel technological approaches, including stem cells and organoids, for studying epicardial function.

Main Results:

• The epicardium plays a key role in regulating cardiomyocyte proliferation, transient fibrosis, and neovascularization in regenerative models.
• Epicardial cells secrete signaling factors that modulate cardiac remodeling during myocardial infarction, with varied effects on repair.
• Transcriptomic studies reveal significant cellular and molecular heterogeneity of the epicardium across species and developmental stages.

Conclusions:

• The epicardium's regenerative capabilities in lower vertebrates offer insights into potential therapeutic strategies for mammalian heart repair.
• Understanding epicardial-derived signaling molecules is critical for developing novel treatments for cardiovascular diseases and developmental disorders.
• Advanced techniques like cardiac organoids hold promise for modeling and advancing reparative cardiovascular medicine.