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Outsmarting Cancer Cells: Researchers Learn How They Spread


News provided by

Saint Louis University Medical Center

Apr 08, 2011, 12:17 ET

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ST. LOUIS, April 8, 2011 /PRNewswire-USNewswire/ -- Saint Louis University researchers have identified a novel mechanism to control the traffic of cells and fluid from tissues to lymphatic vessels. It may be possible to harness this mechanism to fight cancer spread from one organ to another organ and improve the effectiveness of vaccines.

The lymphatic system is an extensive fluid transit system, consisting of vessels in the body. It defends the body against infection. Cancer cells and infection-fighting cells that are part of the immune system use the lymphatic system to get to other organs, including the lymph nodes.

When cancer cells travel along the lymphatic system from one part of the body to another, they can cause metastases - spread to other organs. Many cancer cells, such as those from breast cancer, prostate cancer and lung cancer, enter the lymphatic vessels by releasing molecules that unbutton button-like structures between lymphatic lining cells. This enables them to gain passage into or out of the lymphatic transport system.

SLU scientists have found that molecules known as CRSBP-1 (also termed LYVE-1) ligands, which are a group of growth factors and cytokines, bind to CRSBP-1 receptors, which are located on the surface of lymphatic vessels. This stimulates a response, and acts like a token to gain entry to the lymphatic vessel network. This mechanism for getting into the lymphatic system is used by many cancer cells.

"When the token binds to CRSBP-1, it opens the gate," said Wei-Hsien Hou, Ph.D., lead author of the paper and an M.D./Ph.D. student at Saint Louis University School of Medicine. "Our study is the first to identify a function for this protein. It's important because it gives us a new target to block metastasis, treat edema (swelling of the body from fluid build-up) and enhance the effectiveness of vaccines by strengthening the body's immune responses."

The research team also found that CRSBP-1 ligand molecules (PDGF-BB and VEGF-A) decrease edema in a mouse model by opening lymphatic intercellular junctions, allowing fluid to drain through the lymphatic network and causing swelling to go down.

Understanding how to gain access into the lymphatic network is significant and will have a strong impact in the fields of cancer and immune research, said Jung S. Huang, Ph.D., a study co-author, professor of biochemistry and molecular biology at Saint Louis University and Hou's mentor. "Once you figure out how breast and other cancers spread, you can begin to work on blocking the process. This is very exciting," he said.

The research, which was supported by grants from the National Institutes of Health, was reported in the April 15 issue of the Journal of Cell Science. Other co-authors in this paper include I-Hua Liu, M.S., Cheng C. Tsai, M.D., Frank E. Johnson, M.D. and Shuan S. Huang, Ph.D.

Established in 1836, Saint Louis University School of Medicine has the distinction of awarding the first medical degree west of the Mississippi River. The school educates physicians and biomedical scientists, conducts medical research, and provides health care on a local, national and international level. Research at the school seeks new cures and treatments in five key areas: cancer, infectious disease, liver disease, aging and brain disease and heart/lung disease.

This news release was issued on behalf of Newswise(TM).  For more information, visit http://www.newswise.com.

SOURCE Saint Louis University Medical Center

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