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Mayo-led research team develop agents that keep insulin working longer
Date:5/7/2010

JACKSONVILLE, Fla. More than half a century after researchers identified a promising way to treat diabetes based on blocking the breakdown of insulin in the body, a research team led by a scientist at the Mayo Clinic campus in Florida have developed potent molecules that can do just that.

The researchers say their findings, published in the May issue of PLoS ONE, could lay the foundation for a new class of drugs for treating diabetes. The tiny molecules they developed work by inhibiting a powerful molecular machine known as insulin-degrading enzyme (IDE) from chewing up the insulin hormone. That keeps insulin in the body longer to help remove glucose (simple food sugar) from the blood.

The discovery may lead to drugs that diabetics can use to help insulin work better and longer, says the study's lead researcher, Malcolm Leissring, Ph.D., from Mayo Clinic's Department of Neuroscience. Diabetes affects over 200 million people worldwide, and the incidence is growing at an alarming rate, so new treatments are greatly needed, he says.

IDE is a protease, an enzyme that chops proteins or peptides into smaller pieces. According to Dr. Leissring, inhibitors have been developed for practically all biomedically important proteases in the body. "It was very surprising that IDE inhibitors had not been developed before, particularly given IDE's special relationship with insulin, a very important hormone," he says.

This was especially puzzling because IDE was discovered more than 60 years ago. In fact, finding an IDE inhibitor was a major goal of diabetes research in the 1950s. In a landmark study, one group of early researchers managed to purify a naturally occurring IDE inhibitor, and showed that it made insulin more effective at lowering blood glucose in animals, precisely the desired effect for treating diabetes. However, the composition of the agent was never determined.

The research team initially tried to
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Contact: Kevin Punsky
punsky.kevin@mayo.edu
904-953-2299
Mayo Clinic
Source:Eurekalert

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