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Bigger betas are better Protein found to provide pancreatic cells with protection against diabetes

(Philadelphia, PA) While studying the proteins in pancreatic beta (β) cells the cells that produce insulin researchers at the University of Pennsylvania Medical Center discovered how the protein enzyme Akt1 can cause mice β cells to grow larger and produce more insulin. Their findings, published in this months Nature Medicine, have direct implications for the current need to increase the number of human pancreatic cells available for transplant to diabetic patients.

"The mice bred to produce excess Akt1 protein were more tolerant of glucose and more resistant to diabetes in fact, we simply could not give them diabetes when we tried," said Morris J. Birnbaum, MD, PhD, associate director of the Penn Diabetes Center in the Penn Departments of Medicine & Cell and Molecular Biology and an investigator in the Howard Hughes Medical Institute. "The increase in Akt1 directly leads to an increase in the size, amount, and total production of insulin by β cells."

In the United States, diabetes is the seventh leading cause of death and currently effects over 15 million people. Medical science recognizes two forms of diabetes. Type 1 diabetes results from the immune systems destruction of pancreatic β cells. Type 2 diabetes results when the body cannot either produce enough insulin or properly use the insulin it does produce. Without insulin, the body cannot utilize glucose blood sugar which can lead to a variety of debilitating illnesses, including heart disease, blindness, and kidney failure.

Recently, surgeons have met with success in treating the disorder by transplanting clusters of pancreatic cells, called islets, into diabetic patients. Transplanted islets, which include β cells, have been shown to reestablish the production of insulin in the pancreas. Unfortunately, the demand for islets far outweighs the supply.

"What makes our findings so interesting, clinically, is the potential to enlarge our pool of β cells f
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Contact: Greg Lester
lesterg@uphs.upenn.edu
215-349-5658
University of Pennsylvania School of Medicine
18-Oct-2001


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