Extending the time window of mammalian heart regeneration by thymosin beta 4

Recent studies demonstrated that the heart of 1-day-old neonatal mice could regenerate, with Wt1(+) EPDCs migrating into myocardial regions after partial surgical resection, but this capacity was lost by 7days of age. By treatment with T4 to maintain Wt1 expression and retain the migrating feature of EPDCs in neonatal mice, we explored the possibility of restoring the cardiac regeneration potential of mice. We intraperitoneally injected T4 into 1-day-old mice on daily basis and then apical resection was performed on the mice 7days later. Twenty one days after the resection, morphological analysis revealed that the T4-treated mice regenerated the resected ventricular apex, while the mice in PBS control group developed significant fibrosis without apical regeneration. The T4-treated mice had significantly better ventricular ejection fraction and fractional shortening than controls. During the process of regeneration, Wt1(+) EPDCs migrated into myocardial region and some of them expressed Islet1 and the markers for mature cardiomyocytes, such as cTnT and SA. These characteristics of Wt1(+) EPDCs were also seen in the heart regeneration of mice subjected to apical resection 1day after birth. T4 has no essential effect on cell cycle activity as no disruption of actin filaments was observed in T4-treated hearts. These results revealed that the cardiac regeneration potential of neonatal mice could be extended to the 7th post-natal day by T4 and Wt1(+) EPDCs mobilization might play an important role in the extension.