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Injectable sponge delivers drugs, cells, and structure
Date:11/13/2012

Cambridge, Mass. November 13, 2012 Bioengineers at Harvard have developed a gel-based sponge that can be molded to any shape, loaded with drugs or stem cells, compressed to a fraction of its size, and delivered via injection. Once inside the body, it pops back to its original shape and gradually releases its cargo, before safely degrading.

The biocompatible technology, revealed this week in the Proceedings of the National Academy of Sciences, amounts to a prefabricated healing kit for a range of minimally invasive therapeutic applications, including regenerative medicine.

"What we've created is a three-dimensional structure that you could use to influence the cells in the tissue surrounding it and perhaps promote tissue formation," explains principal investigator David J. Mooney, Robert P. Pinkas Family Professor of Bioengineering at the Harvard School of Engineering and Applied Sciences (SEAS) and a Core Faculty Member at the Wyss Institute for Biologically Inspired Engineering at Harvard.

"The simplest application is when you want bulking," Mooney explains. "If you want to introduce some material into the body to replace tissue that's been lost or that is deficient, this would be ideal. In other situations, you could use it to transplant stem cells if you're trying to promote tissue regeneration, or you might want to transplant immune cells, if you're looking at immunotherapy."

Consisting primarily of alginate, a seaweed-based jelly, the injectable sponge contains networks of large pores, which allow liquids and large molecules to easily flow through it. Mooney and his research team demonstrated that live cells can be attached to the walls of this network and delivered intact along with the sponge, through a small-bore needle. Mooney's team also demonstrated that the sponge can hold large and small proteins and drugs within the alginate jelly itself, which are gradually released as the biocompatible matrix starts t
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Contact: Caroline Perry
cperry@seas.harvard.edu
617-496-1351
Harvard University
Source:Eurekalert  

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Injectable sponge delivers drugs, cells, and structure
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