Building on his Nobel Prize-winning work creating fluorescent proteins that light up the inner workings of cells, a team of researchers led by Howard Hughes Medical Institute investigator Roger Tsien, PhD, professor of pharmacology, chemistry and biochemistry at the University of California, San Diego and the Moores UCSD Cancer Center has developed biological probes that can stick to and light up tumors in mice.
The scientists were able to spot and remove more cancerous tissue in mice injected with the fluorescent probes than in those mice without the fluorescent probes, upping survival five-fold. The findings – reported online the week of February 15 in the early edition of the Proceedings of the National Academy of Sciences – are the latest steps in research aimed at helping surgeons see the outlines of cancerous tumors in real time, and promise to open new doors to using molecular tools in the operating room.
"The development of biological probes that can guide surgeons, rather than depending only on feel and normal 'white light' to see, can provide tools to navigate the body on a molecular level," said first author Quyen Nguyen, MD, PhD, assistant professor of surgery at the University of California, San Diego School of Medicine.
Surgeons often rely on feel, look and experience to tell if they have removed all of a tumor while sparing healthy tissue. While the patient lies on the operating table under anesthesia, tissue samples are quickly examined by pathologists, and remaining tumor tissue is sometimes missed, meaning further surgery or a greater likelihood of tumor recurrence. Tsien, Nguyen and colleagues used synthetic molecules called activatable cell penetrating peptides (ACPPs) and microscopic nanoparticles to develop probes carrying fluorescent and magnetic tags. These tags make tumors visible to MRI and allow the tumors to "glow" on the operating table. The team wanted to see if the probes could aid surgeons in seeing more of the tumor, particularly the margins.
In a series of studies, working mainly in mice with implanted human tumors, the researchers showed that if tumors had spread to surrounding tissue, the ACCP-nanoparticle probes enabled them to visualize areas of tumors that they wouldn't ordinarily see – either because the tissue was buried beneath other tissue or the tumor simply was difficult to distinguish from normal tissue.
Using a technique called PCR (polymerase chain reaction) to measure tumor DNA, they found that, on average, 90 percent fewer cancer cells remained after surgery to remove tumors in mice using the probe-based molecular guidance compared to surgery without it – a 10-fold reduction. They also found that the fluorescently labeled probes hit their mark 93 percent of the time, allowing the researchers to "see" left over tumor tissue.
According to the scientists, only a single injection of the nanoparticle-based probe containing the fluorescent and magnetic tags was needed in order to use MRI to examine the entire mouse model for tumors before and after surgery, in addition to the real-time guidance in surgery.
Nguyen said that in the future, additional tags may be added, and eventually, a cocktail of personalized probes may be designed for individual types of cancers. If the nanoparticle-based probes are successful in finding tumor cells in humans, the researchers envision using them eventually to deliver chemotherapy drugs to finish off the remaining cancer.
Tsien and Nguyen see many advantages to molecularly guided cancer surgery. Probes can be useful in staging cancer, particularly in prostate cancer, and can be used in a variety of tumor types. In addition, such biological probes can be used in laparoscopic and robotic surgery, where surgeons cannot feel the tumor, and rely much more on sight. If surgeons can completely remove a cancer, it may mean a patient could be cured quickly, and at relatively low cost when compared to long-term chemotherapy.
Additional co-authors include: Emilia Olson, Todd Aguilera, Tao Jiang, Miriam Scadeng, and Lesley Ellies, of UC San Diego.
Funding support came from the Department of Defense Breast Cancer Research Program, the Howard Hughes Medical Institute and the National Institutes of Health.
The Moores UCSD Cancer Center is one of the nation's 40 National Cancer Institute-designated Comprehensive Cancer Centers, combining research, clinical care and community outreach to advance the prevention, treatment and cure of cancer. For more information, visit http://health.ucsd.edu/cancer.
Researchers identify potentially druggable mutant p53 proteins that promote cancer growth
09.12.2016 | Cold Spring Harbor Laboratory
Plant-based substance boosts eyelash growth
09.12.2016 | Fraunhofer-Institut für Angewandte Polymerforschung IAP
Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.
Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
09.12.2016 | Life Sciences
09.12.2016 | Ecology, The Environment and Conservation
09.12.2016 | Health and Medicine