A component of garlic oil may help release protective compounds to the heart after heart attack, during cardiac surgery or as a treatment for heart failure.

At low concentrations, hydrogen sulfide gas has been found to protect the heart from damage. However, this unstable and volatile compound has been difficult to deliver as therapy.

Now researchers at Emory University School of Medicine have turned to diallyl trisulfide, a garlic oil component, as a way to deliver the benefits of hydrogen sulfide to the heart. Their findings suggest that doctors could use diallyl trisulfide in many of the situations where researchers have proposed using hydrogen sulfide.

The data was presented Nov. 16 at the American Heart Association (AHA) Scientific Sessions conference in Orlando, Florida.

"We are now performing studies with orally active drugs that release hydrogen sulfide," says David Lefer, Ph.D., professor of surgery at Emory University School of Medicine and director of the

Working with Lefer, postdoctoral fellow Benjamin Predmore blocked the coronary arteries of mice for 45 minutes, simulating a heart attack, and gave them diallyl sulfide just before blood flow was restored. The compound reduced the proportion of damaged heart tissue in the area at risk by 61 percent, compared with untreated animals.

"Interruption of oxygen and blood flow damages mitochondria, and loss of mitochondrial integrity can lead to cell death," he says. "We see that diallyl sulfide can temporarily turn down the function of mitochondria, preserving them and lowering the production of reactive oxygen species."

Transverse aortic constriction results in enlargement of the heart and is a model of heart failure. Diallyl sulfide twice daily, given after aortic constriction, could reduce heart enlargement, Kondo found.

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