Featured Research

from universities, journals, and other organizations

Brain Tumor Treatment May Increase Number Of Cancer Stem-like Cells

Date:
March 12, 2009
Source:
Cell Press
Summary:
A new study suggests that the standard treatment for a common brain tumor increases the aggressiveness of surviving cancer cells, possibly leaving patients more vulnerable to tumor recurrence. The research provides valuable insight into the molecular mechanisms that enable cancer stem-like cells to escape cytotoxic treatment and repopulate the tumor.

A new study suggests that the standard treatment for a common brain tumor increases the aggressiveness of surviving cancer cells, possibly leaving patients more vulnerable to tumor recurrence. The research, published in the March 6th issue of the journal Cell Stem Cell, provides valuable insight into the molecular mechanisms that enable cancer stem-like cells to escape cytotoxic treatment and repopulate the tumor.

Related Articles


Glioblastoma multiforme is the most prevalent and aggressive form of primary brain tumor and is notoriously resistant to standard therapies. Dr. Eric Holland, from Memorial Sloan-Kettering Cancer Center in New York, examined the role of ABCG2, a protein linked with drug resistance, in glioma cancer stem-like cells. "ABC proteins are transporters that participate in tumor resistance by actively transporting drugs across the cell membrane, serving to protect cells from chemotherapeutic agents," offers Dr. Holland.

Dr. Holland and colleagues employed a method that allowed visualization of ABC-mediated efflux of fluorescent dye to identify and isolate "side population" (SP) cells from mouse and human glioblastomas. "Because the SP phenotype in glioma cancer stem-like cells is mainly mediated by ABCG2, as shown by the almost complete abolition of this phenotype when ABCG2 activity is blocked, we subsequently studied the oncogenic potential of ABCG2," explains Dr. Holland.

The researchers confirmed that SP cells are highly tumorigenic, have the ability to self-renew, and are resistant to chemotherapy. These results verified that ABCG2 activity, although not by itself oncogenic, is a marker for glioma stem-like cells. Further, the researchers identified a detailed molecular mechanism that modulates the activity of ABCG2 and enhances the ability of cancer stem-like cells to expel drugs.

Importantly, Dr. Holland's group also found that the chemotherapeutic drug temozolomide, the standard treatment for gliomas, increased the number of glioma cells with stem-like characteristics. The researchers speculated that because temozolomide is not an ABCG2 substrate, the increase in the SP fraction likely resulted from enrichment of cells with stem-like properties. "In the process of increasing the number of cells in tumors with stem-like properties, temozolomide may render surviving cells even more resistant to subsequent treatment with drugs that are substrates for ABCG2," explains Dr. Holland.

The researchers include Anne-Marie Bleau, Dolores Hambardzumyan, Tatsuya Ozawa, Elena I. Fomchenko, Jason T. Huse, Cameron W. Brennan, and Eric C. Holland, of the Memorial Sloan-Kettering Cancer Center, New York, NY.


Story Source:

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


Cite This Page:

Cell Press. "Brain Tumor Treatment May Increase Number Of Cancer Stem-like Cells." ScienceDaily. ScienceDaily, 12 March 2009. <www.sciencedaily.com/releases/2009/03/090305121641.htm>.
Cell Press. (2009, March 12). Brain Tumor Treatment May Increase Number Of Cancer Stem-like Cells. ScienceDaily. Retrieved April 1, 2015 from www.sciencedaily.com/releases/2009/03/090305121641.htm
Cell Press. "Brain Tumor Treatment May Increase Number Of Cancer Stem-like Cells." ScienceDaily. www.sciencedaily.com/releases/2009/03/090305121641.htm (accessed April 1, 2015).

Share This


More From ScienceDaily



More Health & Medicine News

Wednesday, April 1, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

7-Year-Old Girl Gets 3-D Printed 'robohand'

7-Year-Old Girl Gets 3-D Printed 'robohand'

AP (Mar. 31, 2015) — Although she never had much interest in prosthetic limbs before, Faith Lennox couldn&apos;t wait to slip on her new robohand. The 7-year-old, who lost part of her left arm when she was a baby, grabbed it as soon as it came off a 3-D printer. (March 31) Video provided by AP
Powered by NewsLook.com
Solitair Device Aims to Takes Guesswork out of Sun Safety

Solitair Device Aims to Takes Guesswork out of Sun Safety

Reuters - Innovations Video Online (Mar. 31, 2015) — The Solitair device aims to take the confusion out of how much sunlight we should expose our skin to. Small enough to be worn as a tie or hair clip, it monitors the user&apos;s sun exposure by taking into account their skin pigment, location and schedule. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Soda, Salt and Sugar: The Next Generation of Taxes

Soda, Salt and Sugar: The Next Generation of Taxes

Washington Post (Mar. 30, 2015) — Denisa Livingston, a health advocate for the Dinι Community Advocacy Alliance, and the Post&apos;s Abby Phillip discuss efforts around the country to make unhealthy food choices hurt your wallet as much as your waistline. Video provided by Washington Post
Powered by NewsLook.com
UnitedHealth Buys Catamaran

UnitedHealth Buys Catamaran

Reuters - Business Video Online (Mar. 30, 2015) — The $12.8 billion merger will combine the U.S.&apos; third and fourth largest pharmacy benefit managers. Analysts say smaller PBMs could also merge. Fred Katayama reports. Video provided by Reuters
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