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Popular diabetes drug works differently than thought
Date:5/4/2010

CINCINNATIThe popular diabetes medication metformin works in different fashion than the current widely accepted view. This new finding could lead to wider use of the drugparticularly in people with cancer and diseases linked to TSC deficiency like tuberous sclerosis and lymphangioleiomyomatosis (LAM).

The results of this study, led by George Thomas, PhD, scientific director of UC's Metabolic Diseases Institute, are published in the May 5 edition of Cell Metabolism.

Metformin, marketed first by Bristol-Myers Squibb as Glucophage and now available in generic form and a number of combinations, is widely prescribed to people with type 2 diabetes and may be extended to the treatment of certain cancers. The drug blocks the production of glucose (sugar) and increases sensitivity to insulina hormone that converts sugar and other foods into energy within the body.

Researchers have thought that metformin, an energy-deprivation agent, disables the mTOR (mammalian target of rapamycin) complex by first activating the tuberous sclerosis complex (TSC) proteins through the enzyme AMPK.

Thomas' team determined that mTOR could actually be disabled without AMPK, and even without TSC. The team was able to determine that metformin works to knock out mTOR through another enzyme, RAG GTPase.

"We've poked a hole in dogma," says Thomas, a professor in the cancer and cell biology department. "Scientists can and should go back and ask about things they had crossed off their list."

The importance of this finding, says Thomas, is the possibility it holds for broader use of metformin.

"Metformin is already prescribed to 100 million people worldwide, and our study raises the question, 'Could this drug be used even more widely?'"

A drug like metformin, which improves insulin sensitivity, could be seen as a possible viable alternative to drugs that target mTOR, but that may have long-term deleterious effects
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Contact: Dama Kimmon
dama.kimmon@uc.edu
513-558-4519
University of Cincinnati Academic Health Center
Source:Eurekalert

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