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Putting a brake on tumor spread
Date:1/23/2014

A team of scientists, led by principal investigator David D. Schlaepfer, PhD, a professor in the Department of Reproductive Medicine at the University of California, San Diego School of Medicine, has found that a protein involved in promoting tumor growth and survival is also activated in surrounding blood vessels, enabling cancer cells to spread into the bloodstream.

The findings are published in this week's online issue of the Journal of Cell Biology.

Blood vessels are tightly lined with endothelial cells, which form a permeability barrier to circulating cells and molecules. "Our studies show that pharmacological or genetic inhibition of the endothelial protein focal adhesion kinase, or FAK, prevents tumor spread by enhancing the vessel barrier function."

The researchers found that selective FAK inhibition within endothelial cells prevented spontaneous tumor metastasis without alterations in tumor size. Schlaepfer, with colleagues at the UC San Diego Moores Cancer Center, is exploring whether inhibiting targets like FAK, which has important regulatory functions in both tumor cells and blood vessels, might provide a dual mechanism for preventing both cancer growth and spread.

Using mouse models of breast, ovarian and melanoma tumors, first author Christine Jean, PhD, showed that FAK activity was elevated in the blood vessels surrounding tumors, compared to normal tissue. FAK modifies the function of other cellular proteins, and researchers identified a previously unknown FAK target: a protein called vascular endothelial cadherin (VE-cadherin) that helps endothelial cells fasten tightly together. When modified by FAK, VE-cadherin complexes fall apart and blood vessels become leaky. Inactivating FAK within endothelial cells prevented this unwanted permeability and helped block the ability of tumor cells to pass through endothelial cell barriers.

Schlaepfer said the research has major clinical implications
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Contact: Scott LaFee
slafee@ucsd.edu
619-543-6163
University of California - San Diego
Source:Eurekalert  

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