Gold particles and infrared light for controlled drug delivery
A handheld, ultra-portable device that can recognize and immediately report on a wide variety of environmental or medical compounds may eventually be possible, using a method that incorporates a mixture of biologically tagged nanowires onto integrated circuit chips, according to Penn State researchers. “Probably one of the most important things for connecting to the circuit
Full Post: Biologically tagged nanowires integrated onto circuit chips
Using tiny gold particles and infrared light, MIT researchers have developed a drug-delivery system that allows multiple drugs to be released in a controlled fashion.
Such a system could one day be used to provide more control when battling diseases commonly treated with more than one drug, according to the researchers.
“With a lot of diseases, especially cancer and AIDS, you get a synergistic effect with more than one drug,” said Kimberly Hamad-Schifferli, assistant professor of biological and mechanical engineering and senior author of a paper on the work that recently appeared in the journal ACS Nano .
Delivery devices already exist that can release two drugs, but the timing of the release must be built into the device - it cannot be controlled from outside the body. The new system is controlled externally and theoretically could deliver up to three or four drugs.
The new technique takes advantage of the fact that when gold nanoparticles are exposed to infrared light, they melt and release drug payloads attached to their surfaces.
Nanoparticles of different shapes respond to different infrared wavelengths, so “just by controlling the infrared wavelength, we can choose the release time” for each drug, said Andy Wijaya, graduate student in chemical engineering and lead author of the paper.
The team built two different shapes of nanoparticles, which they call “nanobones” and “nanocapsules.” Nanobones melt at light wavelengths of 1,100 nanometers, and nanocapsules at 800 nanometers.
In the ACS Nano study, the researchers tested the particles with a payload of DNA. Each nanoparticle can carry hundreds of strands of DNA, and could also be engineered to transport other types of drugs.
In theory, up to four different-shaped particles could be developed, each releasing its payload at different wavelengths.
A nontoxic nanoparticle developed by Penn State researchers is proving to be an all-around effective delivery system for both therapeutic drugs and the fluorescent dyes that can track their delivery. In a recent online issue of Nano Letters, an interdisciplinary group of materials scientists, chemists, bioengineers, physicists, and pharmacologists show that calcium phosphate particles ranging
Full Post: Nontoxic nanoparticle delivers and tracks drugs
A research team from the Massachusetts Institute of Technology (MIT)-Harvard Center for Nanotechnology Excellence has custom-designed nanoparticles that can deliver the anticancer drug cisplatin specifically to prostate cancer cells. The nanoparticles are composed of two different polymers and are decorated with a nucleic acid aptamer that binds to the tumor marker prostate-specific membrane antigen.
Full Post: Targeted nanoparticles boost platinum-based anticancer therapy
A tiny particle syringe composed of polymer layers and nanoparticles may provide drug delivery that targets diseased cells without harming the rest of the body, according to a team of chemical engineers. This delivery system could be robust and flexible enough to deliver a variety of substances. “People probably fear the effects of some
Full Post: Tiny particle syringe for drug delivery
Antibodies that target epidermal growth factor receptor (EGFR) have proven themselves as potent anticancer drugs. Now, a team of investigators led by Shuming Nie, Ph.D., and Lily Yang, Ph.D., both at the Emory University School of Medicine and members of the Emory-Georgia Tech Nanotechnology Center for Personalized and Predictive Oncology, is aiming to capitalize on
Full Post: Artificial antibody delivers nanoparticles to tumors
MIT engineers have developed carbon nanotubes into sensors for cancer drugs and other DNA-damaging agents inside living cells. The sensors, made of carbon nanotubes wrapped in DNA, can detect chemotherapy drugs such as cisplatin as well as environmental toxins and free radicals that damage DNA. “We’ve made a sensor that can be placed in living
Full Post: Carbon nanotube sensors for cancer drugs