Featured Research

from universities, journals, and other organizations

Molecules on branched-polymer surfaces can capture rare tumor cells in blood

Date:
November 17, 2011
Source:
University of Illinois at Chicago
Summary:
The removal of rare tumor cells circulating in the blood might be possible with the use of biomolecules bound to dendrimers, highly branched synthetic polymers, which could efficiently sift and capture the diseased cells, according to new research.

The removal of rare tumor cells circulating in the blood might be possible with the use of biomolecules bound to dendrimers, highly branched synthetic polymers, which could efficiently sift and capture the diseased cells, according to new research at the University of Illinois at Chicago.

Related Articles


Dendrimers have been used to encapsulate drug molecules and serve as a delivery vehicle, but in the new study they were employed to capture circulating tumor cells by biomimicry -- using nanotechnology to create artificial surfaces much like those in real cells.

"We want to take advantage of what nature gives us," says Seungpyo Hong, lead researcher of the study, published in the journal Angewandte Chemie. "We want to create new biomimetic surfaces that will allow us to remove damaged cells from the blood."

Hong, assistant professor of biopharmaceutical sciences at UIC, and his coworkers created a highly sensitive surface that enables multivalent binding -- the simultaneous binding of many molecules to multiple receptors in a biological system. The biomimetic surface was created using dendrimers of seventh-generation polyamidoamine, or PAMAM, and the anti-epithelial cell adhesion molecule, or aEpCAM.

In the body, cancer cells can detach from a primary tumor and flow throughout the bloodstream, enabling them to seed distant new tumors. Rare and difficult to capture, only a few circulating tumor cells can be found in a milliliter of blood in a cancer patient. By comparison, the same volume of blood contains several million white blood cells and a billion red blood cells, Hong said.

Three breast cancer cell lines were used as circulating tumor cell models, with each used to compare the cell adhesion of the dendrimer surfaces to a linear polymer of polyethylene glycol. PEG is commonly used to bind molecules to improve the safety and efficiency of therapeutics.

The nano-scale PAMAM dendrimers were chosen because their size and surface dimension could accommodate multiple anti-epithelial cell adhesion molecules, Hong said. This enabled the multivalent binding, along with the physiological process of "cell rolling" induced by E-selectin, which mimics the process by which circulating tumor cells are recruited to the endothelia and enhances the surface sensitivity toward tumor cells.

The surface developed by the UIC research team demonstrated up to a million-fold increase in binding strength, and up to 7-fold increase in detection efficiency, as compared to the aEpCAM-coated PEG surface that is the current gold standard for circulating tumor cell detection.

Hong says this is the first study to capture the tumor cells on the surface exploiting the multivalent effect, which is most likely due to the spherical architecture of dendrimers. The research was selected as a "Hot Paper" by Angewandte Chemie and highlighted in Faculty of 1000 by Donald Tomalia, the inventor of PAMAM dendrimers.

The results demonstrate that the combination of nanotechnology and biomimicry has a "great potential to be applied for highly sensitive detection of rare tumor cells from blood," Hong said.

Co-authors are David Eddington, associate professor of bioengineering at UIC; and research assistants Ja Hye Myung, Khyati Gajjar and Jelena Saric. The research was funded through a grant from the National Science Foundation.


Story Source:

The above story is based on materials provided by University of Illinois at Chicago. Note: Materials may be edited for content and length.


Journal Reference:

  1. Ja Hye Myung, Khyati A. Gajjar, Jelena Saric, David T. Eddington, Seungpyo Hong. Dendrimer-Mediated Multivalent Binding for the Enhanced Capture of Tumor Cells. Angewandte Chemie International Edition, 2011; DOI: 10.1002/anie.201105508

Cite This Page:

University of Illinois at Chicago. "Molecules on branched-polymer surfaces can capture rare tumor cells in blood." ScienceDaily. ScienceDaily, 17 November 2011. <www.sciencedaily.com/releases/2011/11/111117144049.htm>.
University of Illinois at Chicago. (2011, November 17). Molecules on branched-polymer surfaces can capture rare tumor cells in blood. ScienceDaily. Retrieved December 20, 2014 from www.sciencedaily.com/releases/2011/11/111117144049.htm
University of Illinois at Chicago. "Molecules on branched-polymer surfaces can capture rare tumor cells in blood." ScienceDaily. www.sciencedaily.com/releases/2011/11/111117144049.htm (accessed December 20, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Saturday, December 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

The Best Tips to Curb Holiday Carbs

The Best Tips to Curb Holiday Carbs

Buzz60 (Dec. 19, 2014) It's hard to resist those delicious but fattening carbs we all crave during the winter months, but there are some ways to stay satisfied without consuming the extra calories. Vanessa Freeman (@VanessaFreeTV) has the details. Video provided by Buzz60
Powered by NewsLook.com
Sierra Leone Bikers Spread the Message to Fight Ebola

Sierra Leone Bikers Spread the Message to Fight Ebola

AFP (Dec. 19, 2014) More than 100 motorcyclists hit the road to spread awareness messages about Ebola. Nearly 7,000 people have now died from the virus, almost all of them in west Africa, according to the World Health Organization. Video provided by AFP
Powered by NewsLook.com
Researchers Test Colombian Village With High Alzheimer's Rates

Researchers Test Colombian Village With High Alzheimer's Rates

AFP (Dec. 19, 2014) In Yarumal, a village in N. Colombia, Alzheimer's has ravaged a disproportionately large number of families. A genetic "curse" that may pave the way for research on how to treat the disease that claims a new victim every four seconds. Duration: 02:42 Video provided by AFP
Powered by NewsLook.com
The Best Protein-Filled Foods to Energize You for the New Year

The Best Protein-Filled Foods to Energize You for the New Year

Buzz60 (Dec. 19, 2014) The new year is coming and nothing will energize you more for 2015 than protein-filled foods. Fitness and nutrition expert John Basedow (@JohnBasedow) gives his favorite high protein foods that will help you build muscle, lose fat and have endless energy. Video provided by Buzz60
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins