A heart damaged by heart attack is usually broken, at least partially, for good.
The injury causes excessive scar tissue to form, and this plays a role in permanently keeping heart muscle from working at full capacity.
Now researchers have identified a key molecule involved in controlling excessive scar tissue formation in mice following a heart attack. When they stopped the scarring from occurring, the scientists found that the animals' heart function greatly improved following the injury.
The study, by scientists at the University of Wisconsin-Madison and Cornell University, appears in Nature Cell Biology online Dec. 14, 2008.
The findings offer heartening news for the millions who have heart attacks each year and suffer from the resulting poor heart function. The study raises the hope that the outlook for people with this major disability might be markedly improved.
The scientists studied a protein, sFRP2, which they unexpectedly found to be involved in the formation of collagen, the main component of scar tissue.
"With many injuries and diseases, large amounts of collagen are formed and deposited in tissues, leading to scarring and a condition called fibrosis," explains co-author Daniel S. Greenspan, professor of pathology and laboratory medicine at the UW School of Medicine and Public Health. "Fibrosis can seriously affect the functioning of heart, lung, liver and other tissues."