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La Jolla Institute scientist leads team which discovers important new player in diabetes onset
Date:6/7/2010

SAN DIEGO (June 7, 2010) If you think of diabetes onset like an elaborate molecular drama, then a research team led by a La Jolla Institute scientist has unmasked a previously unknown cellular player, which is critical to proper insulin secretion. "Defective insulin secretion is a hallmark of both type 1 and type 2 diabetes," said Catherine Hedrick, Ph.D., a scientist at the La Jolla Institute for Allergy & Immunology, who led the team, which included researchers from the University of Virginia.

Working in mouse models, the team discovered that the ABCG1 protein is essential for the beta cells of the pancreas to produce sufficient amounts of insulin. Insulin is needed by the body to convert glucose from food into energy. Problems with insulin production underlie both type 1 and type 2 diabetes. "Based on our studies in mice, we think that some diabetes patients may have reduced expression of ABCG1 which impairs their insulin secretion," said Dr. Hedrick, who has previously published findings showing that type 2 diabetics have lower levels of ABCG1 than non-diabetics.

The research team also showed that proper expression of the ABCG1 protein in beta cells could be restored in the mice by treatment with some existing antidiabetic drugs. "Our study suggests that certain existing antidiabetic drugs may also provide therapeutic benefit related to restoring normal levels of ABCG1 protein in beta cells and improving insulin secretion in people with type 2 diabetes," said Dr. Hedrick. "Our research points to the need to investigate this possibility further as well as to explore the potential development of new therapies that boost ABCG1 protein levels and insulin secretion," she said.

The finding was published online today in the Journal of Clinical Investigation in a paper titled "An intracellular role for ABCG1-mediated cholesterol transport in the regulated secretory pathway of mouse pancreatic beta cells." Jeff Sturek,
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Contact: Bonnie Ward
contact@liai.org
619-303-3160
La Jolla Institute for Allergy and Immunology
Source:Eurekalert

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