Featured Research

from universities, journals, and other organizations

The making and unmaking of stem-like, aggressive breast cancer cells

Date:
August 9, 2012
Source:
University of Colorado Denver
Summary:
Progestins regulate miRNA-29, returning hormone-dependent breast cancer cells to chemoresistant, aggressive, stem-cell-like state.

Reverting to a stem-like state, as shown here, helps breast cancer cells evolve around the blockages of current treatments.
Credit: Flickr/CodonAUG cc license

Breast cancers that depend on the hormones estrogen and progesterone are susceptible to treatments targeting these hormones. Take away this dependence and you lose a valuable treatment option.

Related Articles


A University of Colorado Cancer Center study published as a featured article in the journal Oncogene shows how progesterone does just this -- by suppressing a key microRNA, progestins return breast cancer cells to a stem-cell-like state in which they haven't yet differentiated, and are thus more resistant to chemotherapies and more likely to carry a poor prognosis.

"The reason we were looking into the possible role of microRNAs in the dedifferentiation of breast cancer cells into this aggressive, chemo-resistant phenotype is that microRNAs tend to be good, druggable targets. Because one microRNA may regulate many genes involved in a cancerous signaling pathway, we hoped to find one target with many beneficial effects," says Diana Cittelly, PhD, postdoctoral fellow at the CU Cancer Center and the paper's first author. The study was a collaboration between the CU Cancer Center labs of Jennifer Richer, PhD, and Carol Sartorius, PhD.

Specifically, the study shows that progestins regulate miRNA-29 -- a molecule that helps to decide which of a cell's genes are and are not turned into proteins. This regulation of miRNA-29 creates a cascade that stimulates breast cancer cells to revert back to a stem-like state, marked by proteins CD44 and CK5. In animal models, these stem-like cells helped breast cancer evolve around the blockages of current treatments..

"We can manipulate this miRNA-29 in cell lines," Cittelly says, "and we hope technology isn't too far in the future that will allow us to deliver miRNA-29 in human cancers as well."

Turn off the role of miRNA-29 and the hope is that breast cancers won't be able to gain stem cell-like traits and lose their hormone dependence.


Story Source:

The above story is based on materials provided by University of Colorado Denver. The original article was written by Garth Sundem. Note: Materials may be edited for content and length.


Cite This Page:

University of Colorado Denver. "The making and unmaking of stem-like, aggressive breast cancer cells." ScienceDaily. ScienceDaily, 9 August 2012. <www.sciencedaily.com/releases/2012/08/120809133851.htm>.
University of Colorado Denver. (2012, August 9). The making and unmaking of stem-like, aggressive breast cancer cells. ScienceDaily. Retrieved November 27, 2014 from www.sciencedaily.com/releases/2012/08/120809133851.htm
University of Colorado Denver. "The making and unmaking of stem-like, aggressive breast cancer cells." ScienceDaily. www.sciencedaily.com/releases/2012/08/120809133851.htm (accessed November 27, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Thursday, November 27, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Pet Dogs to Be Used in Anti-Ageing Trial

Pet Dogs to Be Used in Anti-Ageing Trial

Reuters - Innovations Video Online (Nov. 26, 2014) Researchers in the United States are preparing to discover whether a drug commonly used in human organ transplants can extend the lifespan and health quality of pet dogs. Video provided by Reuters
Powered by NewsLook.com
Today's Prostheses Are More Capable Than Ever

Today's Prostheses Are More Capable Than Ever

Newsy (Nov. 26, 2014) Advances in prosthetics are making replacement body parts stronger and more lifelike than they’ve ever been. Video provided by Newsy
Powered by NewsLook.com
From Popcorn To Vending Snacks: FDA Ups Calorie Count Rules

From Popcorn To Vending Snacks: FDA Ups Calorie Count Rules

Newsy (Nov. 25, 2014) The US FDA is announcing new calorie rules on Tuesday that will require everywhere from theaters to vending machines to include calorie counts. Video provided by Newsy
Powered by NewsLook.com
Daily Serving Of Yogurt Could Reduce Risk Of Type 2 Diabetes

Daily Serving Of Yogurt Could Reduce Risk Of Type 2 Diabetes

Newsy (Nov. 25, 2014) Need another reason to eat yogurt every day? Researchers now say it could reduce a person's risk of developing type 2 diabetes. 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:

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