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New technique can help nanoparticles deliver drug treatments
Date:5/7/2013

route of nanomedicines for cancer applications, for example, and measured the quantity of the nanoparticles in all tissues and the rates at which it degraded. They then compared those rates to those predicted by in vitro measurements.

Reineke said the 200 nm particles degraded much faster in the body than in vitro, while the 500 nm particles degraded similarly to in vitro analyses. The liver and spleen had the highest concentration of polymers and therefore were easiest to analyze.

Researchers found that 500 nm particles degraded faster in the liver than the spleen, but for the 200 nm size the degradation rate in the liver and the spleen were similar.

"It's known that larger particles degrade differently, and we verified that," Reineke said, "but they didn't quite degrade in vivo the way we would expect. We found that among tissue types there are differences in how they degrade."

"That tells us that in vitro degradation doesn't predict in vivo degradation very well, because we see so many differences."

Reineke said that by in vivo testing of other types of nanoparticles, a mathematical model can be developed to help determine which are most effective and have the lowest toxicity for a given application.

"Optimizing a therapeutic system that utilizes nanoparticles is really about getting that timing correct. In order to do that, we have to know how and when the particles are going to release the drug."


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Contact: Julie O'Connor
julie.oconnor@wayne.edu
313-577-8845
Wayne State University - Office of the Vice President for Research
Source:Eurekalert

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