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Infiltrating cancer's recruitment center
Date:1/26/2011

Tel Aviv The most common connective tissue cell in animals is the fibroblast, which plays an important role in healing wounds. But Dr. Neta Erez of Tel Aviv University's Sackler Faculty of Medicine has now demonstrated that fibroblasts can also do a body great harm, helping to "recruit" immune cells for tumor growth.

At the onset of a tumor's creation when cancer cell proliferation is beginning, fibroblasts rush to the scene to aid in healing. However, Dr. Erez's research shows that these ordinarily helpful cells can actually be turned against the body, enhancing tumor growth by stimulating inflammation.

Her research was done in animal models using fresh mouse skin cancer as well as human tumors extracted in the operating room. It was originally carried out at the University of California, San Francisco in the lab of Prof. Douglas Hanahan. Published in Cancer Cell, her most recent findings demonstrate that a growing tumor can co-opt fibroblasts, turning them into cancer-associated fibroblasts (CAFs) making them do the dirty work of supporting tumors.

Cancer and inflammation a two-way street

In recent years, scientists have begun to understand the link between inflammation and cancer. Their findings suggested why long-term aspirin therapy which reduces inflammation can help prevent or slow cancer growth.

Inflammation causes cancer, and researchers are now finding that the reverse is also true: cancer can also cause inflammation by attracting immune cells to sites of growing tumors. Inflammatory cells are implicated in all solid tumors, including liver cancer, which may start with chronic liver inflammation due to hepatitis, and intestinal or colon cancer, which can be triggered by chronic inflammation of the bowels from an ulcer, colitis or Crohn's disease.

"Cancer cells recruit CAFs at very early stages," Dr. Erez says. "Under normal circumstances fibroblasts are very good for health
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Contact: George Hunka
ghunka@aftau.org
212-742-9070
American Friends of Tel Aviv University
Source:Eurekalert  

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