Vegfa Impacts Early Myocardium Development in Zebrafish.
Diqi Zhu1, Yabo Fang2, Kun Gao3
1Department of Pediatric Cardiology, Shanghai Children's Medical Center Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200127, China. zhudiqi@scmc.com.cn.
International Journal of Molecular Sciences
|February 24, 2017
Summary
Vascular endothelial growth factor A (Vegfa) signaling is crucial for heart development. Loss of Vegfa function causes cardiac defects by impairing myocardium fusion, highlighting its direct role in early heart morphogenesis.
Area of Science:
- Cardiovascular Biology
- Developmental Biology
- Molecular Genetics
Background:
- Vascular endothelial growth factor A (Vegfa) signaling is essential for cardiovascular development.
- The precise cellular mechanisms of Vegfa signaling during early cardiogenesis are not fully understood.
Purpose of the Study:
- To elucidate the differential functions and underlying mechanisms of Vegfa signaling in cardiac development.
- To investigate the role of Vegfa in early heart formation.
Main Methods:
- Utilized a loss-of-function approach in zebrafish models.
- Generated and analyzed morphants and mutants for vegfaa.
Main Results:
- Loss of vegfaa function resulted in significant defects in cardiac looping and chamber formation, particularly affecting the ventricle.
- Vegfa signaling regulates heart morphogenesis in a dose-dependent manner.
- Impaired myocardium fusion was identified as the primary defect, preceding endocardial abnormalities.
Conclusions:
- Vegfa signaling directly impacts myocardium fusion, serving as an initial cause of cardiac developmental defects.
- Endocardial defects observed later are likely secondary to impaired myocardium-endocardium crosstalk.
- Vegfa plays a critical, dose-dependent role in regulating heart morphogenesis.
