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Updated: Jan 28, 2026
11:04
Isolation of Valvular Endothelial Cells
Published on: December 29, 2010
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Endocardially Derived Macrophages Are Essential for Valvular Remodeling.
Ayako Shigeta1, Vincent Huang1, Jonathan Zuo1
1Department of Molecular, Cell, and Developmental Biology, University of California, Los Angeles, Los Angeles, CA 90095, USA.
Developmental Cell
|February 26, 2019
Summary
Endocardial hematopoiesis is essential for heart development, generating macrophages crucial for cardiac valve remodeling. This study reveals transient hemogenic activity in the endocardium is indispensable for proper valvular tissue formation.
Area of Science:
- Developmental biology
- Hematopoiesis
- Cardiovascular research
Background:
- Mammalian embryogenesis involves transient de novo hematopoiesis in sites like the yolk sac and heart.
- The essentiality of these local hematopoietic mechanisms for embryonic growth remains unclear.
Purpose of the Study:
- To investigate the role of endocardial hematopoiesis in embryonic development.
- To determine if endocardial-derived cells are critical for cardiac valve formation and remodeling.
Main Methods:
- Colony formation assays using explanted embryonic heart tubes.
- Genetic lineage tracing utilizing the endocardial-specific Nfatc1-Cre mouse model.
- Surface marker characterization, gene expression profiling, and ex vivo phagocytosis assays.
Main Results:
- Hemogenic endocardium identified as a de novo source of tissue macrophages within the endocardial cushion.
- Endocardially derived cardiac tissue macrophages exhibit phagocytic and antigen-presenting functions.
- Genetic ablation of these macrophages led to severe cardiac valve malformations.
Conclusions:
- Endocardial hematopoiesis is critical for cardiac valve remodeling.
- Transient hemogenic activity in the endocardium is indispensable for valvular tissue development.
- Endocardially derived macrophages play a vital role in heart valve formation.
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