How the discovery of mammalian regeneration shapes translational efforts
A landmark study demonstrated that neonatal mice can regenerate damaged hearts, challenging the long-held belief that mammals lack regenerative potential.
Regeneration restores the original organ functions impaired by injury, disease, and ageing. Unlike zebrafish and axolotls, which maintain robust regenerative potential throughout development and adulthood, mammals were once thought to be devoid of regenerative capacity for organs such as the heart and spinal cord. The 2011 study by Hesham Sadek and Eric Olson showed that 1-day-old neonatal mice successfully regenerate damaged hearts after partial surgical resection. This finding highlights that mammals possess regenerative potential at birth. The implications of this work extend beyond understanding neonatal cardiac regeneration, holding promise for regeneration-deficient adult human hearts. The study revealed that intrinsic regenerative potential, previously thought to be lost in later developmental stages, is encoded within the mammalian genome for cardiac tissues. This discovery has significant implications for research on the evolution of regenerative capacities and the development of strategies to reactivate regeneration in non-regenerating mammals. Further fundamental studies are likely to push the boundaries of regenerative biology, paving the way for safe and reliable strategies to activate dormant regenerative potential in adult mammalian tissues.