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Silk optics find multiple uses in human body

05 Dec '12
4 min read

Preventing Infection, Fighting Cancer

The Tufts researchers also demonstrated the silk mirrors’ potential to administer therapeutic treatments.

In one experiment, the researchers mixed gold nanoparticles in the silk protein solution before casting the MPAs. They then implanted the gold-silk mirror under the skin of mice. When illuminated with green laser light, the nanoparticles converted light to heat. Similar in-vitro experiments showed that the devices inhibited bacterial growth while maintaining optical performance.

The team also embedded the cancer-fighting drug doxorubicin in the MPAs. The embedded drug remained active even at high temperatures (60 degree C), underscoring the ability of silk to stabilize chemical and biological dopants.

When exposed to enzymes in vitro, the doxorubicin was released as the mirror gradually dissolved. The amount of reflected light decreased as the mirror degraded, allowing the researchers to accurately assess the rate of drug delivery.

"The important implication here is that using a single biofriendly, resorbable device one could image a site of interest, such as a tumor, apply therapy as needed and then monitor the progress of the therapy," says Omenetto.

Collaborating with Omenetto and Kaplan from Tufts Department of Biomedical Engineering were Hu Tao, research assistant professor; Jana M. Kainerstorfer, post-doctoral researcher; Sean M. Siebert, a Tufts undergraduate; Eleanor M. Pritchard, former post-doctoral researcher; Angelo Sassaroli, research  assistant professor; Bruce J.B. Panilaitis, research assistant professor; Mark A. Brenckle, graduate student; Jason Amsden, former post-doctoral researcher; Jonathan Levitt, post-doctoral researcher, and Professor Sergio Fantini.

At Tufts, Fiorenzo Omenetto also has an appointment in the Department of Physics in the School of Arts and Sciences, and David Kaplan also has appointments in the Department of Chemical and Biological Engineering, the Department of Chemistry in the School of Arts and Sciences, the Sackler School of Graduate Biomedical Sciences, and the School of Dental Medicine.

The work was supported by the United States Army Research Laboratory, the United States Army Research Office, the Defense Advanced Research Projects Agency, the Air Force Office of Scientific Research, the Tissue Engineering Resource Center of the National Institutes of Health under award number P41EB00250 and the National Science Foundation.

Tufts University School of Engineering Located on Tufts' Medford/Somerville campus, the School of Engineering offers a rigorous engineering education in a unique environment that blends the intellectual and technological resources of a world-class research university with the strengths of a top-ranked liberal arts college.

Tufts University School of Engineering

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