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Tumor-activated protein promotes cancer spread
Date:5/13/2013

Researchers at the University of California, San Diego School of Medicine and UC San Diego Moores Cancer Center report that cancers physically alter cells in the lymphatic system a network of vessels that transports and stores immune cells throughout the body to promote the spread of disease, a process called metastasis.

The findings are published in this week's online Early Edition of the Proceedings of the National Academy of Sciences.

Roughly 90 percent of all cancer deaths are due to metastasis the disease spreading from the original tumor site to multiple, distant tissues and finally overwhelming the patient's body. Lymph vessels are often the path of transmission, with circulating tumor cells lodging in the lymph nodes organs distributed throughout the body that act as immune system garrisons and traps for pathogens and foreign particles.

The researchers, led by principal investigator Judith A. Varner, PhD, professor of medicine at UC San Diego Moores Cancer Center, found that a protein growth factor expressed by tumors called VEGF-C activates a receptor called integrin α4β1 on lymphatic vessels in lymph node tissues, making them more attractive and sticky to metastatic tumor cells.

"One of the most significant features of this work is that it highlights the way that tumors can have long-range effects on other parts of the body, which can then impact tumor metastasis or growth," said Varner.

Varner said α4β1 could prove to be a valuable biomarker for measuring cancer risk, since increased levels of the activated protein in lymph tissues is an indirect indicator that an undetected tumor may be nearby.

She said whole-body imaging scans of the lymphatic network might identify problem areas relatively quickly and effectively. "The idea is that a radiolabeled or otherwise labeled anti-integrin α4β1 antibody could be injected into the lymphatic circulation, and i
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Contact: Scott LaFee
slafee@ucsd.edu
619-543-6163
University of California - San Diego
Source:Eurekalert

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