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UVa Health System team uncovers gene's role in type 1 diabetes
Date:11/7/2007

Researchers at the University of Virginia Health System have identified an enzyme thought to be an important instigator of the inner-body conflict that causes Type 1 diabetes. A chronic condition that affects nearly three million American children and adults, Type 1 diabetes is more severe than Type 2. Type 1 diabetes, also called autoimmune diabetes, arises when the bodys infection-fighting white blood cells start destroying the beta-cells that produce insulin in the pancreas.

To shed light on how this conflict begins, UVa researchers focused on a single gene, 12/15-lipoxygenase (12/15-LO). This gene leads to the production of the enzyme, which appears to have an important role in the activation of white blood cells in the pancreas.

Researchers developed non-obese diabetic female mice to serve as a model of Type 1 diabetes. After turning off the 12/15-LO gene in study mice, they discovered that these mice without the enzyme were 97 percent less likely to develop diabetes than mice that had normal levels of it, according to the study, published online in the journal Diabetes (to be published in print in February 2008).

This research is exciting because it advances our knowledge of a new gene that is involved in causing Type 1 diabetes and could pave the way for new treatments to prevent or reverse this increasingly prevalent disease, said Dr. Jerry L. Nadler, who is chief of the UVa Division of Endocrinology and Metabolism.

UVa researchers also discovered that study mice that did not have the 12/15-LO gene and remained non-diabetic demonstrated better glucose tolerance than non-diabetic NOD mice that were matched for age. (Worse glucose tolerance is an indication of having a pre-diabetes condition). The same group of study mice also had improved beta cell mass and less severe insulitis than their non-diabetic NOD counterparts.

Insulitis is a change in the islet cells that includes a high-fluid volume and too many
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Contact: Mary Jane Gore
mjgore@virginia.edu
434-924-9241
University of Virginia Health System
Source:Eurekalert

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