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Slow-release 'jelly' delivers drugs better
Date:1/28/2013

iram, former Chilkoti graduate student and first author on the paper, dubbed the new delivery system POD, for protease-operated depot.

In the latest experiments, published on-line in the journal Proceedings of the National Academy of Sciences, the researchers fused glucagon-like peptide-1 (GLP-1), a hormone that regulates the release of insulin, with a genetically engineered heat-sensitive polymer to create the POD.

"Remarkably, a single injection of the GLP-1 POD was able to reduce blood glucose levels in mice for up to five days, which is 120 times longer than an injection of the peptide alone," Chilkoti said. "For a patient with type 2 diabetes, it would be much more desirable to inject such a drug once a week or once a month rather than once or twice a day.

"Additionally, this approach avoids the peaks and valleys of drug concentrations that these patients often experience," Chilkoti said.

Unlike peptide-loaded microspheres, PODs are also easy to manufacture, because the peptide drug and the heat-sensitive polymer are all made of amino acids. They can be built as one long stretch of amino acids by engineered bacteria.

"This new delivery system provides the first entirely genetically encoded alternative to peptide drug encapsulation for sustained delivery of peptide drugs," Chilkoti said.


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Contact: Richard Merritt
richard.merritt@duke.edu
919-660-8414
Duke University
Source:Eurekalert

Page: 1 2

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