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Red Wine may Help Treat Diabetes

by VR Sreeraman on October 15, 2009 at 4:58 PM
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 Red Wine may Help Treat Diabetes

The much touted naturally produced molecule called resveratrol, found in red wine, may help squeeze out diabetes, says a new study.

In the study, resveratrol has been shown to lower insulin levels in mice when injected directly into the brain, even when the animals ate a high-fat diet.

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The findings from a new UT Southwestern Medical Center study suggest that when acting directly on certain proteins in the brain, resveratrol may offer some protection against diabetes.

Earlier research has shown that resveratrol exerts anti-diabetic actions when given orally to animals with type 2 diabetes (non-insulin dependent diabetes mellitus), but it has been unclear which tissues in the body mediated these effects.
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"Our study shows that the brain plays an important role in mediating resveratrol's anti-diabetic actions, and it does so independent of changes in food intake and body weight," said Dr. Roberto Coppari, assistant professor of internal medicine at UT Southwestern and senior author of the study appearing online and in the December issue of Endocrinology.

"These animals were overrun with fat and many of their organs were inflamed. But when we delivered resveratrol in the brain, it alleviated inflammation in the brain," added Coppari.

However, Coppari emphasized that his study does not support the conclusion that consuming products made from red grapes could alleviate diabetes.

"The main reason is that resveratrol does not cross the blood brain barrier efficiently," he said.

"In order for the brain to accumulate the same dose of resveratrol delivered in our study, the amounts of red wine needed daily would surely cause deleterious effects, especially in the liver. Rather, our study suggests that resveratrol's analogs that selectively target the brain may help in the fight against diet-induced diabetes," he added.

For the study, the researchers investigated what happens when resveratrol acts only in the brain. Specifically, they wanted to know whether resveratrol injected in the brain activated a group of proteins called sirtuins, which are found throughout the body and thought to underlie many of the beneficial effects of calorie restriction.

In one group of animals, researchers injected resveratrol directly into the brain; another group received a saline-based placebo. All the surgically treated animals consumed a high-fat diet before and after the surgery.

Coppari said the insulin levels of the animals treated with the placebo solution rose increasingly higher post-surgery.

"That's a normal outcome because insulin sensitivity decreases the longer you keep an animal on a high-fat diet," he said.

Insulin levels in the mice given resveratrol, however, actually started to drop and were halfway to normal by the end of the five-week study period, even though the animals remained on a high-fat diet.

In addition, the researchers found that resveratrol did indeed activate sirtuin proteins in the brain.

Source: ANI
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