Skin patch could painlessly deliver vaccines, cancer medications in one minute

phys.org | 8/25/2019 | Staff
maddyb7 (Posted by) Level 3
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Melanoma is a deadly form of skin cancer that has been increasing in the U.S. for the past 30 years. Nearly 100,000 new cases of melanoma are diagnosed every year, and 20 Americans die every day from it, according to the American Academy of Dermatology. Now, researchers have developed a fast-acting skin patch that efficiently delivers medication to attack melanoma cells. The device, tested in mice and human skin samples, is an advance toward developing a vaccine to treat melanoma and has widespread applications for other vaccines.

The researchers will present their findings today at the American Chemical Society (ACS) Fall 2019 National Meeting and Exposition.

Patch - Chemical - Coating - Mode - Action

"Our patch has a unique chemical coating and mode of action that allows it to be applied and removed from the skin in just a minute while still delivering a therapeutic dose of drugs," says Yanpu He, a graduate student who helped develop the device. "Our patches elicit a robust antibody response in living mice and show promise in eliciting a strong immune response in human skin."

Topical ointments can impart medications to the skin, but they can only penetrate a small distance through it. While syringes are an effective drug delivery mode, they can be painful. Syringes can also be inconvenient for patients, leading to noncompliance.

Microneedle - Patches - Layer-by-layer - LbL - Method

Microneedle patches, prepared with a layer-by-layer (LbL) coating method, are one easy, pain-free way to administer treatment. With the LbL process, researchers coat a surface with molecules of alternating positive and negative charge. For a robust drug film to form on the surface of the patch, every adjacent layer must be strongly attracted to each other and also to the microneedle. "But this attraction makes the entire film very 'sticky,'" He notes. "Past methods, which have retained this 'sticky' nature, can take up to 90 minutes for a sufficient amount of...
(Excerpt) Read more at: phys.org
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