Researchers in Israel report they have discovered a molecule in newborn hearts that appears to control the process of renewing heart muscle. When injected into adult mouse hearts injured by heart attacks, this molecule, called Agrin, seems to “unlock” that renewal process and enable heart muscle repair – something never seen in human heart tissue outside of the womb. These findings, published June 5 in Nature, point to new directions for research on restoring the function of damaged hearts. Heart disease is the leading cause of death worldwide. The healing process following a human heart attack is long and inefficient, explained Prof. Eldad Tzahor of the Weizmann Institute of Science, who led the study together with doctoral student Elad Bassat, research student Alex Genzelinakh and other Weizmann molecular cell biologists. Once damaged, muscle cells called cardiomyocytes are replaced by scar tissue, which cannot pump blood and therefore place a burden on the remaining cardiomyocytes. -- More...

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