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Harvard scientists control cells following transplantation, from the inside out
Date:1/10/2014

Harvard stem cells scientists at Brigham and Women's Hospital and MIT can now engineer cells that are more easily controlled following transplantation, potentially making cell therapies, hundreds of which are currently in clinical trials across the United States, more functional and efficient.

Associate Professor Jeffrey Karp, PhD, and James Ankrum, PhD, demonstrate in this month's issue of Nature Protocols how to load cells with microparticles that provide the cells cues for how they should behave over the course of days or weeks as the particles degrade.

"Regardless of where the cell is in the body, it's going to be receiving its cues from the inside," said Karp, a Harvard Stem Cell Institute Principal Faculty member at Brigham and Women's Hospital. "This is a completely different strategy than the current method of placing cells onto drug-doped microcarriers or scaffolds, which is limiting because the cells need to remain in close proximity to those materials in order to function. Also these types of materials are too large to be infused into the bloodstream."

Cells are relatively simple to control in a Petri dish. The right molecules or drugs, if internalized by a cell, can change its behavior; such as inducing a stem cell to differentiate or correcting a defect in a cancer cell. This level of control is lost after transplantation as cells typically behave according to environmental cues in the recipient's body. Karp's strategy, dubbed particle engineering, corrects this problem by turning cells into pre-programmable units. The internalized particles stably remain inside the transplanted cell and tell it exactly how to act, whether the cell is needed to release anti-inflammatory factors or regenerate lost tissue.

"Once those particles are internalized into the cells, which can take on the order of 6-24 hours, we can deliver the transplant immediately or even cryopreserve the cells," Karp said. "When the cells ar
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Contact: Joseph Caputo
joseph_caputo@harvard.edu
914-573-1784
Harvard University
Source:Eurekalert  

Page: 1 2

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