New Drug Delivery System: Gold Nanoparticles use DNA to Deliver Doxorubicin, Improving Cancer Treatment

For the first time, scientists in Syracuse University's Chemistry Department have created a new drug delivery system expected to advance the effectiveness of cancer-killing drugs. The delivery system uses gold nanoparticles with attached DNA that binds to Doxorubicin or DOX, an anthracycline antibiotic which is closely related to the natural product daunomycin. Like all anthracyclines, Doxorubicin works by intercalating DNA.

Preliminary tests indicate this delivery device has the potential to significantly improve the results of cancer chemotherapy. Doxorubicin is currently used against cancers of the breast, bone marrow, thyroid, bladder, ovary, small cell lung and several others.

Delivering high concentrations anti-tumor drugs
"The possibilities of this new system are really exciting," says SU Professor James C. Dabrowiak. "For example, it would be easy to add to the device molecules that have the ability to target cancer cells. Another possibility is using light excitation to release high concentrations of an anti-tumor drug directly within the tumor."

These and other upgrades could enable clinics to focus chemotherapy more tightly on cancer cells and reduce negative side effects on healthy cells in other parts of the body. A key element of the new system is that the DNA attached to the gold particles is engineered specifically to bind to the Doxorubicin anti-tumor drug. Studies show that the Doxorubicin can be transferred by diffusion to a receptor DNA molecule.

A deadly assault on cancer
The gold nanoparticles have an average diameter of only 15.5 nanometers or a few billionths of a meter. A single nanoparticle presents more than 100 Doxorubicin sites and that, when multiplied by millions of the particles, could create a massive and deadly assault on a tumor.

"We believe this work can bring significant gains in the effectiveness of chemotherapy treatments," says Mathew M. Maye, SU Assistant Professor of Chemistry and co-inventor of the delivery system. "We still have work to do but this advance opens a promising new field of investigation that can lead to important new clinical tools." A key advantage of the new system is that the Doxorubicin anti-tumor drug is already accepted by the FDA. Other such drugs may be deployed using this system simply by engineering the DNA to bind to a different drug molecule.

Smart particles
The Syracuse laboratory is continuing investigations to check the toxicity of the system. They will also explore "smart" particles capable of attaching to cancer cells and responding to triggers that will activate drug release. Prior discoveries demonstrate that such nano-delivery systems may be within reach and could help deliver large payloads of anti-tumor drugs where needed.

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