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Updated: Sep 17, 2025
Intrathoracic Injection for the Study of Adult Zebrafish Heart
Published on: May 14, 2019
Cloche/Npas4l is a pro-regenerative platelet factor during zebrafish heart regeneration
Junjie Hou1, Yabing Song2, Chenglu Xiao3
1School of Basic Medical Sciences, The Second Affiliated Hospital, Institute of Biomedical Innovation, The MOE Basic Research and Innovation Center for the Targeted Therapeutics of Solid Tumors, Jiangxi Medical College, Nanchang University, Nanchang 330031, China; Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, College of Future Technology, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100871, China.
Platelets are crucial for zebrafish heart regeneration. The study identifies npas4l as a key platelet factor that promotes cardiomyocyte and endothelial cell proliferation, essential for repairing heart injuries.
Area of Science:
- Cardiovascular Biology
- Regenerative Medicine
- Hematology
Background:
- Zebrafish exhibit remarkable heart regeneration capabilities.
- The role of blood cells, particularly platelets, in this process remains largely unexplored.
Purpose of the Study:
- To investigate the function of cloche/npas4l as a pro-regenerative platelet factor in zebrafish heart regeneration.
- To elucidate the mechanisms by which platelets modulate cardiomyocyte and endothelial cell proliferation during cardiac repair.
Main Methods:
- Single-cell transcriptomic analysis of zebrafish hearts post-injury.
- Genetic manipulation of npas4l expression in zebrafish.
- Assessment of cardiomyocyte and endothelial cell proliferation.
- Functional studies involving platelet depletion and overexpression.
Main Results:
- Haploinsufficiency of npas4l impaired cardiomyocyte (CM) and endothelial cell (EC) proliferation and heart regeneration.
- npas4l expression in platelets dynamically increased after heart injury, mediating platelet-CM and platelet-EC interactions.
- Platelet depletion reduced CM/EC proliferation, while npas4l overexpression in platelets rescued proliferation defects.
- Npas4l signaling in platelets regulates ligand expression, such as bmp6, influencing CM proliferation.
Conclusions:
- Platelet Npas4l signaling is a critical pro-regenerative mechanism in zebrafish heart regeneration.
- Platelets modulate CM and EC proliferation through a ligand-receptor network involving Npas4l during cardiac repair.
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