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Manipulating key protein in the brain holds potential against obesity and diabetes
Date:7/25/2014

DALLAS -- A protein that controls when genes are switched on or off plays a key role in specific areas of the brain to regulate metabolism, UT Southwestern Medical Center researchers have found.

The research potentially could lead to new therapies to treat obesity and diabetes, since the transcription factor involved spliced X-box binding protein 1 (Xbp1s) appears to influence the body's sensitivity to insulin and leptin signaling. Insulin and leptin are hormones central to the body's regulation of food intake and sugar disposal, and obesity and diabetes are conditions under which the body develops resistance to their actions.

"This study identifies critical molecular mechanisms that link the brain and peripheral endocrine tissues and that ultimately contribute to the regulation of body weight and glucose metabolism," said Dr. Kevin Williams, Assistant Professor of Internal Medicine and co-first author of the study with Dr. Tiemin Liu, a postdoctoral research fellow in Internal Medicine.

Researchers found that over-expression of the gene Xbp1s in mice that were fed a high-fat diet protected them against obesity and diabetes, according to the recent study, published online in Cell Metabolism. On average, these mice were 30 percent leaner than mice fed the same food. The gene's actions took place in pro-opiomelanocortin (Pomc) neurons in the hypothalamic region of the brain. Elevated Xbp1s levels in Pomc neurons mimicked a "fed" signal, resulting in improved body weight, decreased blood glucose levels, and improved insulin sensitivity in the liver.

"Manipulating this one gene in the brain affected metabolism in the liver. This result shows that the brain is controlling glucose production by the liver," said Dr. Joel Elmquist, Director of the Division of Hypothalamic Research, Professor of Internal Medicine, Pharmacology, and Psychiatry, and holder of the Carl H. Westcott Distinguished Chair in
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Contact: Debbie Bolles
debbie.bolles@utsouthwestern.edu
214-648-3404
UT Southwestern Medical Center
Source:Eurekalert

Page: 1 2

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