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Laying bare the not-so-sweet tale of a sugar and its role in the spread of cancer
Date:4/25/2011

BETHESDA, Md., April 25, 2011 Cancer has a mighty big bag of tricks that it uses to evade the body's natural defense mechanisms and proliferate. Among those tricks is one that allows tumor cells to turn the intricate and extensive system of lymphatic vessels into something of a highway to metastasis. Yet research unveiled this week may aid in the development of therapeutics that will put the brakes on such cancer spread, and the researchers who completed the study say the findings may extend to other lymphatic disorders.

In the latest issue of the Journal of Biological Chemistry, the team at the VA San Diego Healthcare System and the University of California, San Diego, reports an important advance in the understanding of the molecular machinery needed for lymphatic cell growth.

"In many carcinomas, lymphatic vessels grow and remodel around and sometimes within tumors. This allows tumor cells to go upstream to the lymph nodes," explains assistant professor Mark Fuster, who led the study. Once tumor cells hitch a ride to the lymph nodes, the disease can be more difficult to fight. "We were trying to understand the mechanisms that turn on the growth of lymphatic vessel cells in the laboratory."

To better understand how tumors get lymphatic vessels to construct an entry ramp for cancerous cells, Fuster's team began by looking at a much-studied lymphatic stimulatory protein that is often over-produced by tumors. The protein migrates from the tumor to a layer of cells within lymphatic vessels known as the endothelium. The tumor-produced protein is officially known as vascular endothelial growth factor C, or VEGF-C for short (pronounced "vej-eff-cee").

"The growth factor VEGF-C lands on a special receiving molecule, or receptor, on the surface of the lymphatic endothelial cells, sending a signal that says it's time for the endothelial cells to replicate and send offshoots," Fuster says. But the team was curious as to wheth
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Contact: Angela Hopp
ahopp@asbmb.org
301-634-7389
American Society for Biochemistry and Molecular Biology
Source:Eurekalert

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