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Researchers use nanoparticles to deliver vaccines to lungs
Date:9/25/2013

st a small amount of weight after infection but then fully recovered, whereas the viral challenge was 100 percent lethal to mice who received the non-nanoparticle vaccine.

"Giving the vaccine at the mucosal surface in the nanocapsule form allowed us to completely block that systemic infection," Irvine says.

The researchers also found a strong memory T cell presence at distant mucosal surfaces, including in the digestive and reproductive tracts. "An important caveat is that although immunity at distant mucus membranes following vaccination at one mucosal surface has been seen in humans as well, it's still being worked out whether the patterns seen in mice are fully reproduced in humans," Irvine says. "It might be that it's a different mucosal surface that gets stimulated from the lungs or from oral delivery in humans."

Tumor defense

The particles also hold promise for delivering cancer vaccines, which stimulate the body's own immune system to destroy tumors.

To test this, the researchers first implanted the mice with melanoma tumors that were engineered to express ovalbumin, a protein found in egg whites. Three days later, they vaccinated the mice with ovalbumin. They found that mice given the nanoparticle form of the vaccine completely rejected the tumors, while mice given the uncoated vaccine did not.

Further studies need to be done with more challenging tumor models, Irvine says. In the future, tests with vaccines targeted to proteins expressed by cancer cells would be necessary.


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Contact: Andrew Carleen
acarleen@mit.edu
617-253-1682
Massachusetts Institute of Technology
Source:Eurekalert

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