Investigation of Cardiomyocyte Regeneration in Injured Zebrafish Heart and Role of Wnt Signaling in Cardiac Repair

The study demonstrated that zebrafish could fully regenerate their ventricular myocardium to pre-injury levels within four weeks, even in the presence of scars, indicating efficient cardiomyocyte regeneration. The research highlighted the active role of Wnt/β-catenin signaling in promoting cardiomyocyte dedifferentiation and proliferation, essential for regeneration, although it did not significantly affect scar removal. The study also noted the upregulation of the Wnt9a ligand in endothelial cells post-injury, underscoring the importance of Wnt signaling in zebrafish cardiac repair.