Navigation Links
Nanoparticles may enhance circulating tumor cell detection
Date:2/11/2011

Tiny gold particles can help doctors detect tumor cells circulating in the blood of patients with head and neck cancer, researchers at Emory and Georgia Tech have found.

The detection of circulating tumor cells (CTCs) is an emerging technique that can allow oncologists to monitor patients with cancer for metastasis or to evaluate the progress of their treatment. The gold particles, which are embedded with dyes allowing their detection by laser spectroscopy, could enhance this technique's specificity by reducing the number of false positives.

The results are published online in the journal Cancer Research.

One challenge with detecting CTCs is separating out signals from white blood cells, which are similarly sized as tumor cells and can stick to the same antibodies normally used to identify tumor cells. Commercially available devices trap CTCs using antibody-coated magnetic beads, and technicians must stain the trapped cells with several antibodies to avoid falsely identifying white blood cells as tumor cells.

Emory and Georgia Tech researchers show that polymer-coated and dye-studded gold particles, directly linked to a growth factor peptide rather than an antibody, can detect circulating tumor cells in the blood of patients with head and neck cancer.

The key technological advance here is our finding that polymer-coated gold nanoparticles that are conjugated with low molecular weight peptides such as EGF are much less sticky than particles conjugated to whole antibodies, says Shuming Nie, PhD, a professor in the Wallace H. Coulter Department of Biomedical Engineering at Georgia Tech and Emory University. This effect has led to a major improvement in discriminating tumor cells from non-tumor cells in the blood.

The particles are linked to EGF (epithelial growth factor), whose counterpart EGFR (epithelial growth factor receptor) is over-produced on the surfaces of several types of tumor cells.

Upon laser illumination, the particles display a sharp fingerprint-like pattern that is specific to the dye, because the gold enhances the signal coming from the dyes. This suggests that several types of nanoparticles could be combined to gain more information about the growth characteristics of the tumor cells. In addition, measuring CTC levels may be sensitive enough to distinguish patients with localized disease from those with metastatic disease.

Nanoparticles could be instrumental in modifying the process so that circulating tumor cells can be detected without separating the tumor cells from normal blood cells, Nie says. Weve demonstrated that one tumor cell out of approximately one to ten million normal cells can be detected this way.

In collaboration with oncologists at Winship Cancer Institute, researchers used nanoparticles to test for CTCs in blood samples from 19 patients with head and neck cancer. Of these patients, 17 had positive signals for CTCs in their blood. The two with low signals were verified to have no circulating cells by a different technique.

Although the results have not been compared or validated with current CTC detection methods, our one-tube SERS technology could be faster and lower in costs than other detection methods, says Dong Moon Shin, MD, professor of hematology and oncology and otolaryngology, associate director of academic development for Winship Cancer Institute and director of the Winship Cancer Institute Chemoprevention Program. We need to validate this pilot study by continuing with larger groups of patients and comparing with other tests.


'/>"/>

Contact: Holly Korschun
hkorsch@emory.edu
404-727-3990
Emory University
Source:Eurekalert

Related medicine news :

1. New nanoparticles make blood clots visible
2. Special sugar, nanoparticles combine to detect cholera toxin
3. Delivering a potent cancer drug with nanoparticles can lessen side effects
4. Einstein-Montefiore researcher will test nanoparticles against pancreatic cancer
5. Iron oxide nanoparticles becoming tools for brain tumor imaging and treatment
6. With magnetic nanoparticles, scientists remotely control neurons and animal behavior
7. Curcumin nanoparticles open up resistant cancers
8. Novel nanoparticles prevent radiation damage
9. Attacking cancer cells with hydrogel nanoparticles
10. Using gold nanoparticles to hit cancer where it hurts
11. Study shows delayed-enhancement MRI may predict, prevent strokes
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/24/2017)... , ... March 24, 2017 , ... The iaedp Foundation, ... other medical professionals caring for those suffering from the full spectrum of disordered eating, ... as eating disorders professionals from nearly all 50 states and several countries converged on ...
(Date:3/24/2017)... ... March 24, 2017 , ... As the ... create a communications platform that positions them as the go-to thought leader in ... their online publication as an always-on, always-fresh news, views and advocacy engine, called ...
(Date:3/24/2017)... ... ... Viewers who like to educate themselves on current issues and who enjoy ... societal issues tend to appreciate and love the "Informed" series, hosted by Rob Lowe. ... for causes around the world. , Running for charity has become a ...
(Date:3/24/2017)... ... March 24, 2017 , ... “Finding Christ ... #TruthwithGrace”: a devotional journal chronicling the writer’s path toward true communion with God. ... with God #TruthwithGrace” is the creation of published author Lea Michelle Johnson, a ...
(Date:3/24/2017)... ... , ... “The Adventures of Joey, The Dog Who Barks at Puddles”: a ... to the fullest, as God intended. “The Adventures of Joey, The Dog Who Barks ... pursuing her passion for writing, especially about truth and human behavior. , Published by ...
Breaking Medicine News(10 mins):
(Date:3/23/2017)... N.C. , March 23, 2017  Transportation Insight, ... as an end-to-end supply chain management firm with expertise ... Consumer Product Solutions Rick Zaffarano was named ... of the Supply Chain by the only publication exclusively ... global food supply chain. "Rick has brought ...
(Date:3/23/2017)... BARBARA, Calif. and INDIANAPOLIS ... (NYSE: LLY ) and the William Sansum ... the lives of Latino people affected by diabetes through ... tremendous burden of diabetes and cardiovascular disease bears a ... United States ," said David Kerr , ...
(Date:3/23/2017)...  The U.S. Food and Drug Administration today granted ... adults and pediatric patients 12 years and older with ... not received prior chemotherapy. This is the first FDA-approved ... skin cancer. "While skin cancer is one ... form called Merkel cell cancer have not had an ...
Breaking Medicine Technology: