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Engineering center to probe forces that cause cancer to spread
Date:10/26/2009

more aggressively invade the surrounding normal tissues where oxygen is more plentiful. Hypoxia-inducible factor 1 controls the responses of cancer cells to low oxygen, and we have recently identified drugs that block the action of HIF-1 and inhibit tumor growth in experimental cancer models."

The center's second key research project teams Wirtz with Greg D. Longmore, a cancer cell biologist at Washington University in St. Louis. The two will study the physical basis for cancer cell adhesion and de-adhesion and how it increases the likelihood that cancer cells will break free, move into the bloodstream and migrate to other tissues. "Cancer cells are able to modulate proteins on the surface almost like a protein 'brake' that allows them to adhere or de-adhere in response to mechanical forces," Wirtz said.

The center's third primary research project will be led by Konstantinos Konstantopoulos, professor and chair of the Whiting School's Department of Chemical and Biomolecular Engineering, and Martin L. Pomper, who holds appointments in the School of Medicine's Department of Radiology and the Kimmel Cancer Center. These two researchers will investigate the effects of fluid mechanical forces at different oxygen tension microenvironments on tumor cell signaling, adhesion and migration.

"Fluid flow in and around tumor tissue modulates the mechanical microenvironment, including the forces acting on the cell surface and the tethering force on cell-substrate connections," Konstantopoulos said. "Cells in the interior of a tumor mass experience a lower oxygen tension microenvironment and lower fluid velocities than those at the edges in proximity with a functional blood vessel and are prompted to produce different biochemical signals. These differential responses affect tumor cell fatethat is, whether a cell will live or die, and whether it will be able to detach and migrate to secondary sites in the body."

All three projects will combi
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Contact: Mary Spiro
mspiro@jhu.edu
410-516-4802
Johns Hopkins University
Source:Eurekalert

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