Chemistry 2011.org
Chemistry2011.org
All About Chemistry... 2011 and beyond

Related Stories

New technology using fluorescent proteins tracks cancer cells circulating in blood

After cancer spreads, finding and destroying malignant cells that circulate in the body is usually critical to patient survival. Now, researchers reporting in the Cell Press journal Chemistry & Biology have developed a new method that allows investigators to label and track single tumor cells circulating in the blood. This advance could help investigators develop a better understanding of cancer spread and how to stop it.

Cancer spread, or metastasis, leads to up to 90% of cancer deaths. Investigators currently do not have the clinical capability to intervene and stop the dissemination of tumor cells through metastasis because many steps of this process remain unclear. It is known that cancer cells undergo multiple steps, including invasion into nearby normal tissue, movement into the lymphatic system or the bloodstream, circulation to other parts of the body, invasion of new tissues, and growth at distant locations. Now, a new approach developed by Dr. Ekaterina Galanzha of the University of Arkansas for Medical Sciences in Little Rock and her colleagues allows for labeling and tracking of individual circulating cancer cells throughout the body, thereby helping researchers elucidate the pathways of single cells from start to finish.

The advance uses photoswitchable fluorescent proteins that change their color in response to light. When the first laser of light hits the circulating tumor cells, they appear to be fluorescent green. A second laser, using a different wavelength, makes the cells appear to be fluorescent red. To label individual cells, researchers use a very thin violet laser beam aimed at small blood vessels.

The fluorescence from each cell is collected, detected, and reproduced on a computer monitor as real-time signal traces, allowing the investigators to count and track individual cells in the bloodstream

"This technology allows for the labeling of just one circulating pathological cell among billions of other normal blood cells by ultrafast changing color of photosensitive proteins inside the cell in response to laser light," explains Dr. Galanzha.

In tumor-bearing mice, the researchers could monitor the real-time dynamics of circulating cancer cells released from a primary tumor. They could also image the various final destinations of individual circulating cells and observe how these cells travel through circulation and colonize healthy tissue, existing sites of metastasis, or the site of the primary tumor. "Therefore, the approach may give oncologists knowledge on how to intervene and stop circulating cancer cell dissemination that might prevent the development of metastasis," she says.

The approach might also prove useful for other areas of medicine -- for example, tracking bacteria during infections or immune-related cells during the development of autoimmune disease.

Story Source:

The above story is based on materials provided by Cell Press. Note: Materials may be edited for content and length.

Share this story with your friends!

Social Networking

Please recommend us on Facebook, Twitter and more:

Other social media tools

Global Partners
Feedback

Tell us what you think of Chemistry 2011 -- we welcome both positive and negative comments. Have any problems using the site? Questions?

About us

Chemistry2011 is an informational resource for students, educators and the self-taught in the field of chemistry. We offer resources such as course materials, chemistry department listings, activities, events, projects and more along with current news releases.

Events & Activities

Are you interested in listing an event or sharing an activity or idea? Perhaps you are coordinating an event and are in need of additional resources? Within our site you will find a variety of activities and projects your peers have previously submitted or which have been freely shared through creative commons licenses. Here are some highlights: Featured Idea 1, Featured Idea 2.

About you

Ready to get involved? The first step is to sign up by following the link: Join Here. Also don’t forget to fill out your profile including any professional designations.

Global Partners