The research is available on-line in the journal Advanced Functional Materials. Tests so far involve laboratory cell cultures, but the researchers said MRI tracking will be particularly advantageous as they move toward tests in animals and people.
"Some of the most essential questions in nanomedicine today are about biodistribution - where particles go inside the body and how they get there", stated study co-author Naomi Halas. "Non-invasive tests for biodistribution will be enormously useful on the path to FDA approval, and this technique - adding MRI functionality to the particle you're testing and using for therapy - is a very promising way of doing this."
Naomi Halas, Rice's Stanley C. Moore Professor in Electrical and Computer Engineering and professor of chemistry and biomedical engineering, is a pioneer in nanomedicine. The all-in-one particles are based on nanoshells - particles she invented in the 1990s that are currently in human clinical trials for cancer treatment. Nanoshells harvest laser light that would normally pass harmlessly through the body and convert it into tumour-killing heat.
In designing the new particle, Naomi Halas partnered with Amit Joshi, assistant professor in BCM's Division of Molecular Imaging, to modify nanoshells by adding a fluorescent dye that glows when struck by near-infrared (NIR) light. NIR light is invisible and harmless, so NIR imaging could provide doctors with a means of diagnosing diseases without surgery.
In studying ways to attach the dye, Naomi Halas' graduate student, Rizia Bardhan, found that dye molecules emitted 40-50 times more light if a tiny gap was left between them and the surface of the nanoshell. The gap was just a few nanometers wide, but rather than waste the space, Rizia Bardhan inserted a layer of iron oxide that would be detectable with MRI. The researchers also attached an antibody that lets the particles bind to the surface of breast and ovarian cancer cells.
In the lab, the team tracked the fluorescent particles and confirmed that they targeted cancer cells and destroyed them with heat. Amit Joshi said the next step will be to destroy whole tumours in live animals. He estimates that testing in humans is at least two years away, but the ultimate goal is a system where a patient gets a shot containing nanoparticles with antibodies that are tailored for the patient's cancer. Using NIR imaging, MRI or a combination of the two, doctors would observe the particles' progress through the body, identify areas where tumours exist and then kill them with heat.
"This particle provides four options - two for imaging and two for therapy", Amit Joshi stated. "We envision this as a platform technology that will present practitioners with a choice of options for directed treatment."
Eventually, Amit Joshi said, he hopes to develop specific versions of the particles that can attack cancer at different stages, particularly early stage cancer, which is difficult to diagnose and treat with current technology. The researchers also expect to use different antibody labels to target specific forms of the disease. Naomi Halas said the team has been careful to choose components that are either already approved for medical use or are already in clinical trials.
"What's nice is that every single component of this has been approved or is on a path toward FDA approval", Naomi Halas stated. "We're putting together components that all have good, proven track records."
Rizia Bardhan and BCM postdoctoral researcher Wenxue Chen are co-primary authors of the paper. Additional Rice co-authors include Emilia Morosan, assistant professor of physics and astronomy, and graduate students Ryan Huschka and Liang Zhao. Additional BCM co-authors include Robia Pautler, assistant professor of neuroscience and radiology, postdoctoral researcher Marc Bartels and graduate student Carlos Perez-Torres.
The research was sponsored by the Air Force Office of Scientific Research, the Welch Foundation and the Department of Defense's Multidisciplinary University Research Initiative. You can consult the paper at http://tinyurl.com/nanocomplex