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The heart wall comprises three distinct layers: the epicardium, myocardium, and endocardium. The outermost layer, the epicardium, is the visceral layer of the serous pericardium, featuring a thin, transparent mesothelial surface and an inner layer of areolar connective tissue with fat deposits that increase with age.
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The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.
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The Isolation and Culture of Primary Epicardial Cells Derived from Human Adult and Fetal Heart Specimens
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Exploring the Function of Epicardial Cells Beyond the Surface.

David Wong1,2, Julie Martinez1,2, Pearl Quijada1,3,4

  • 1Department of Integrative Biology and Physiology, (D.W., J.M., P.Q.).

Circulation Research
|July 4, 2024
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Summary

The epicardium is crucial for heart development and repair, particularly in regenerative species. Understanding its cellular functions offers potential for new cardiovascular therapies in mammals.

Keywords:
angiogenesiscardiovascular diseasesfibrosisinflammationmyocardial infarction

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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.