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On the trail of a targeted therapy for blood cancers
Date:10/10/2008

INDIANAPOLIS Investigators from the Herman B Wells Center for Pediatric Research at the Indiana University School of Medicine are focusing on a family of blood proteins that they hope holds a key to decreasing the toxic effects of chemotherapy in children and adults.

Their findings may one day help in the development of targeted therapies for leukemia, multiple myeloma and other cancers of the blood.

The researchers, led by Kristin T. Chun, Ph.D., assistant professor of pediatrics and of biochemistry and molecular biology, studied how the cullin family of proteins affects the degradation of proteins that control the development of blood cells. Their work was published in the July 15 issue of Blood, the journal of the American Society of Hematology.

The cullin family of proteins is involved in the degradation of proteins that control a myriad of cell functions, including those that determine whether a blood cell will eventually develop into a mature blood cell, will divide, or will undergo programmed cell death.

"How cullin 4A regulates other proteins that control the fate of blood cells is important because when cullin 4A fails to regulate their degradation properly, blood cells die and this leads to bone marrow failure. There are many reasons why this is significant." said Dr. Chun. "For example, when blood cells make wrong decisions the result can be a lack of a sufficient number of certain types of mature blood cells causing leukemia, anemia, or bone marrow failure."

Working with mice which had been genetically engineered to lack cullin 4A, the researchers found that within less than two weeks all blood cells disappeared because without this cullin, no new blood cells were being made.

"Our work is the first to show an effect in all blood cells and establishes that Cul4A is essential for the survival of blood cells and possibly other cells including cells of the intestine. It's still early
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Contact: Cindy Fox Aisen
caisen@iupui.edu
317-274-7722
Indiana University
Source:Eurekalert  

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