Wnt10b gain-of-function in cardiomyocytes improved ventricular function, reduced scar size, and promoted robust neovascularization compared with wild-type mice after cardiac injury.
Does Wnt10b gain-of-function improve cardiac repair and ventricular function in mouse models of myocardial infarction?
Wnt10b gain-of-function promotes arteriole formation, attenuates fibrosis, and improves ventricular function after myocardial injury in mice.
RATIONALE: Myocardial infarction causes irreversible tissue damage, leading to heart failure. We recently discovered that canonical Wnt signaling and the Wnt10b ligand are strongly induced in mouse hearts after infarction. Wnt10b regulates cell fate in various organs, but its role in the heart is unknown. OBJECTIVE: To investigate the effect of Wnt10b gain-of-function on cardiac repair mechanisms and to assess its potential to improve ventricular function after injury. METHODS AND RESULTS: Histological and molecular analyses showed that Wnt10b is expressed in cardiomyocytes and localized in the intercalated discs of mouse and human hearts. After coronary artery ligation or cryoinjury in mice, Wnt10b is strongly and transiently induced in peri-infarct cardiomyocytes during granulation tissue formation. To determine the effect of Wnt10b on neovascularization and fibrosis, we generated a mouse line to increase endogenous Wnt10b levels in cardiomyocytes. We found that gain of Wnt10b function orchestrated a recovery phenotype characterized by robust neovascularization of the injury zone, less myofibroblasts, reduced scar size, and improved ventricular function compared with wild-type mice. Wnt10b stimulated expression of vascular endothelial growth factor receptor 2 in endothelial cells and angiopoietin-1 in vascular smooth muscle cells through nuclear factor-κB activation. These effects coordinated endothelial growth and smooth muscle cell recruitment, promoting robust formation of large, coronary-like blood vessels. CONCLUSION: Wnt10b gain-of-function coordinates arterial formation and attenuates fibrosis in cardiac tissue after injury. Because generation of mature blood vessels is necessary for efficient perfusion, our findings could lead to novel strategies to optimize the inherent repair capacity of the heart and prevent the onset of heart failure.
Paik et al. (Fri,) conducted a other in Myocardial infarction. Wnt10b gain-of-function vs. Wild-type mice was evaluated on Cardiac repair mechanisms including neovascularization, fibrosis, and ventricular function. Wnt10b gain-of-function in cardiomyocytes improved ventricular function, reduced scar size, and promoted robust neovascularization compared with wild-type mice after cardiac injury.