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Key to treating cancer may be finding its original cell
Date:8/11/2008

DURHAM, N.C. Cancer biologists are turning their attention to the normal cells that give rise to cancers, to learn more about how tumor growth might be stopped at the earliest opportunity.

"Identifying the specific, normal cells that cancers come from can provide critical insight into how cancers develop," said Robert Wechsler-Reya, an associate professor of Pharmacology and Cancer Biology at Duke University Medical Center. "This may help us develop more rational and effective approaches to treatment."

Every cancer comes from a normal cell. The hard part is finding the cell at the root of each particular subtype of cancer. For the first time, the Duke team has identified two types of cells in the brain that can give rise to the malignant brain tumor medulloblastoma. This dangerous cancer, which occurs most commonly in children, is currently treated with a combination of surgery, chemotherapy and radiation, which have extremely severe side effects, said Wechsler-Reya, who is a member of the Preston Robert Tisch Brain Tumor Center at Duke.

To find the normal cells at the root of medulloblastoma, Wechsler-Reya's laboratory, in collaboration with Brandon Wainwright's laboratory at the University of Queensland in Australia, created mouse models of medulloblastoma by turning off the patched gene, a key regulator of cell growth in the developing brain cerebellum. In particular, they tested the effects of shutting off patched in granule neuron precursors (GNPs), which can only make one particular type of nerve cell (neuron), or in stem cells, which can make all the different cell types in the cerebellum.

When they deleted patched in the neuron precursors, 100 percent of the mice developed medulloblastoma. Deleting patched from stem cells initially led to the formation of many more stem cells. However, most of these stem cells went on to form normal cell types within the cerebellum. Only the patched-less stem cells that gave ris
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Contact: Mary Jane Gore
mary.gore@duke.edu
919-660-1309
Duke University Medical Center
Source:Eurekalert

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