Featured Research

from universities, journals, and other organizations

Metabolic state of brain cancer stem cells significantly different than the cancer cells they create

Date:
September 6, 2011
Source:
University of California - Los Angeles Health Sciences
Summary:
The metabolic state of glioma stem cells, which give rise to deadly glioblastomas, is significantly different from that of the brain cancer cells to which they give birth, a factor which helps those stem cells avoid treatment and cause recurrence later.

The metabolic state of glioma stem cells, which give rise to deadly glioblastomas, is significantly different from that of the brain cancer cells to which they give birth, a factor which helps those stem cells avoid treatment and cause recurrence later.

Researchers with the UCLA Department of Radiation Oncology at UCLA's Jonsson Comprehensive Cancer Center also found for the first time that these glioma stem cells can change their metabolic state at will, from glycolysis, which uses glucose, to oxidative phosphorylation, which uses oxygen.

The glioma stem cells' ability to change their metabolic state at will also allow these stem cells that seed new cancer growth to evade treatment and remain alive, said Dr. Frank Pajonk, an associate professor of radiation oncology and senior author of the study.

"We found these cancer stem cells are substantially different in their metabolic states than the differentiated cancer cells they create, and since they act differently, they can't be killed in the same way," Pajonk said. "And as yet, we don't have anything to target these glioma stem cells specifically."

The study is published this week in the early online edition of the journal Proceedings of the National Academy of Sciences.

Cancer cells take up large amounts of glucose, which fuels their grow and spread and allows them to be differentiated from normal cells under Positron Emission Tomography (PET) scanning, which captures metabolic activity. Pajonk and his team found that the glioma stem cells took up much less glucose, which makes them difficult to detect with PET.

Targeting cancer metabolic pathways as a treatment has gained new interest in recent years. However, these cancer stem cells that take up less glucose could evade those treatments by utilizing glucose more efficiently through oxidative phosphorylation, which would not be targeted by such drugs.

"If glioma stem cells are indeed important for tumor control, knowledge of the metabolic state of glioma stem cells is needed," the study states.

Using a unique imaging system Pajonk and his team developed for glioma stem cells that relies on low enzymatic activity of the proteasome in cancer stem cells, they were able to assess them for metabolic function, including oxygen consumption rates, glucose uptake and other markers. They also found that the glioma stem cells were resistant to radiation, another roadblock to targeting these cells with conventional treatments.

Pajonk and his team concluded that glioma stem cells rely mainly on oxidative phosphorylation for energy. But they found if the stem cells were challenged, they could switch on additional metabolic pathways.

The study also shows for the first time that low expression of proteasome sub-units, an indicator of large numbers of glioma stem cells in the tumor, predicts unfavorable treatment outcomes for those patients.

"What I think is really exciting is we have here for the first time a novel cancer stem cell marker in glioma, which gives us an additional tool to look for these cells and come up with therapies that target them," said Pajonk, who also is a researcher with the Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research at UCLA.

This study was funded by the National Cancer Institute.


Story Source:

The above story is based on materials provided by University of California - Los Angeles Health Sciences. Note: Materials may be edited for content and length.


Cite This Page:

University of California - Los Angeles Health Sciences. "Metabolic state of brain cancer stem cells significantly different than the cancer cells they create." ScienceDaily. ScienceDaily, 6 September 2011. <www.sciencedaily.com/releases/2011/09/110906164309.htm>.
University of California - Los Angeles Health Sciences. (2011, September 6). Metabolic state of brain cancer stem cells significantly different than the cancer cells they create. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2011/09/110906164309.htm
University of California - Los Angeles Health Sciences. "Metabolic state of brain cancer stem cells significantly different than the cancer cells they create." ScienceDaily. www.sciencedaily.com/releases/2011/09/110906164309.htm (accessed April 18, 2014).

Share This



More Health & Medicine News

Friday, April 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

'Holy Grail' Of Weight Loss? New Find Could Be It

'Holy Grail' Of Weight Loss? New Find Could Be It

Newsy (Apr. 18, 2014) In a potential breakthrough for future obesity treatments, scientists have used MRI scans to pinpoint brown fat in a living adult for the first time. Video provided by Newsy
Powered by NewsLook.com
Scientists Create Stem Cells From Adult Skin Cells

Scientists Create Stem Cells From Adult Skin Cells

Newsy (Apr. 17, 2014) The breakthrough could mean a cure for some serious diseases and even the possibility of human cloning, but it's all still a way off. Video provided by Newsy
Powered by NewsLook.com
Obama: 8 Million Healthcare Signups

Obama: 8 Million Healthcare Signups

AP (Apr. 17, 2014) President Barack Obama gave a briefing Thursday announcing 8 million people have signed up under the Affordable Care Act. He blasted continued Republican efforts to repeal the law. (April 17) Video provided by AP
Powered by NewsLook.com
Is Apathy A Sign Of A Shrinking Brain?

Is Apathy A Sign Of A Shrinking Brain?

Newsy (Apr. 17, 2014) A recent study links apathetic feelings to a smaller brain. Researchers say the results indicate a need for apathy screening for at-risk seniors. Video provided by Newsy
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:
from the past week

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