BITC induces cardiomyocyte proliferation and heart regeneration

Cardiomyocyte proliferation is an evolutionarily conserved mechanism that supports cardiac regeneration in vertebrates. Mammalian cardiomyocytes are arrested from the cell cycle shortly after birth, and therefore mammals lose the ability to regenerate injured myocardium for the rest of their lives. Pharmacological induction of cardiomyocyte proliferation has gained a lot of interest in recent years, as researchers strive to achieve heart tissue regeneration. Here we show that a small chemical, benzyl isothiocyanate (BITC), induced cardiomyocyte proliferation through activation of the cyclin-dependent kinase (CDK) pathway. BITC treatment also allowed heart regeneration in the infarcted neonatal heart, even after the regeneration period in mice. Furthermore, administration of BITC to adult mice in parallel with mild hypoxia (10% O2) induced cell cycle reentry in the adult heart. Our findings thus suggest that pharmacological activation of the CDK pathway using BITC, concurrently with the activation of hypoxia-related signaling pathways, may be a promising approach to inducing cardiac regeneration in patients with heart disease.