Oxytocin has been found to stimulate heart stem cells — regenerating heart tissue after injury.The 'love hormone' oxytocin could be the key to healing broken hearts by triggering the regeneration of cardiac muscle cells.Scientists at Michigan State University have discovered that oxytocin, the hormone often associated with social bonding, plays a critical role in heart repair. In studies involving zebrafish and human cell cultures, oxytocin was found to activate Epicardium-derived Progenitor Cells (EpiPCs). These specialized stem cells have the unique ability to transform into cardiomyocytes, the muscle cells that generate heartbeats. When a heart is injured, oxytocin levels surge, effectively signaling the body to begin rebuilding lost or damaged cardiac tissue.This breakthrough suggests a promising new path for treating heart disease and recovering from heart attacks. While zebrafish naturally use this mechanism to heal their hearts, laboratory tests on human cells confirm that oxytocin outperforms other molecules in stimulating regeneration. Because oxytocin is already approved for medical use in other contexts, researchers believe it could be rapidly repurposed for cardiac therapy. Future clinical trials will focus on developing longer-lasting versions of the hormone to help patients regrow healthy heart muscle and restore vital cardiovascular function.source: Wasserman, A. H., Huang, A., & Aguirre, A. Oxytocin promotes epicardial cell activation and heart regeneration after cardiac injury. Frontiers in Cell and Developmental Biology.