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MIT works toward novel therapeutic device
Date:10/22/2007

CAMBRIDGE, Mass.-MIT and University of Rochester researchers report important advances toward a therapeutic device that has the potential to capture cells as they flow through the blood stream and treat them. Among other applications, such a device could zapp cancer cells spreading to other tissues, or signal stem cells to differentiate.

Their concept leverages cell rolling, a biological process that slows cells down as they flow through blood vessels. As the cells slow, they adhere to the vessel walls and roll, allowing them to sense signals from nearby tissues that may be calling them to work. Immune cells, for example, can be slowed and summoned to battle an infection.

Through mimicking a process involved in many important physiological and pathological events, we envision a device that can be used to selectively provide signals to cells traveling through the bloodstream, said Jeffrey M. Karp of the Harvard-MIT Division of Health Sciences and Technology. This technology has applications in cancer and stem cell therapies and could be used for diagnostics of a number of diseases.

The team, led by Karp, started with technology to induce cell rolling for research. With an implantable therapeutic device in mind, they improved that cell rolling technology to make it safe, more stable and longer lasting.

The improvements are described in the October 20 online issue of the journal Langmuir, published by the American Chemical Society.

In the body, P-selectin and other selectin proteins regulate cell rolling in blood vessels. When P-selectin is present on a vessel's inner wall, cells that are sensitive to it will stick to that patch and begin to roll across it.

To induce rolling in the laboratory, the original technology weakly adheres P-selectin to a glass surface and flows cells across it. This surface treatment remains stable for several hours then breaks down. While this method is useful for experiments, it's
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Contact: Elizabeth Thomson
thomson@mit.edu
617-258-5402
Massachusetts Institute of Technology
Source:Eurekalert

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