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LSUHSC research finds single gene controls growth of some cancers
Date:6/11/2009

New Orleans, LA Research led by Ashok Aiyar, PhD, Associate Professor of Microbiology at LSU Health Sciences Center New Orleans, showing that a single gene can control growth in cancers related to the Epstein-Barr virus and that existing therapeutics can inactivate it, will be published in the June 12, 2009 online issue of PLoS Pathogens.

The Epstein-Barr virus (EBV) is closely associated with many human cancers such as Burkitt's lymphoma, Hodgkin's lymphoma, AIDS-related lymphomas, post-transplant lymphoproliferative disease, cancers of the nose and throat, and stomach cancer. In many of these malignancies, proteins made by EBV are necessary for tumor cells to grow indiscriminately. This is especially true of AIDS-related lymphomas and post-transplant lymphoproliferative disease, which are serious complications of AIDS and transplant surgery. These cancers are responsible for thousands of deaths each year in the United States.

The LSUHSC research team, which also includes Kenneth Johnston, PhD, Professor of Microbiology, and Timothy Foster, PhD, Assistant Professor of Microbiology and faculty of the LSUHSC Gene Therapy Program, investigated a small region of a certain Epstein-Barr virus protein called EBNA1, to determine the role it plays in the activation of the EBV genes responsible for the indiscriminate growth of tumor cells in these cancers. Their research shows that EBNA1 is controlled by oxidative stress (pathologic changes in response to excessive levels of free radicals) within the EBV-infected cells. Varying levels of oxidative stress change EBNA1's ability to activate EBV genes responsible for indiscriminate tumor cell growth.

"We have shown that in vitro, existing therapeutics such as Vitamin K that can change oxidative stress within cells, inactivate EBNA1," notes Dr. Aiyar, who is also a member of the faculty of the LSUHSC Stanley S. Scott Cancer Center. "As a consequence, EBV genes required for proliferation are no longe
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Contact: Leslie Capo
lcapo@lsuhsc.edu
504-568-4806
Louisiana State University Health Sciences Center
Source:Eurekalert

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