Featured Research

from universities, journals, and other organizations

Carbohydrate Regulates Stem Cell Potency

Date:
February 8, 2008
Source:
American Society for Biochemistry and Molecular Biology
Summary:
A carbohydrate molecule that coats certain proteins on the cell surface, is critical for the proper proliferation and potency of embryonic stem cells, researchers report. Stem cells' tremendous therapeutic potential arises from their ability to continually self-renew and turn into any adult cell type. Researchers have long been trying to uncover the basis of these abilities, but while several proteins and growth factors are known to play a role both inside and outside the cell, the molecular mechanisms remain largely unknown.

Model displayes external factors that act to block stem cells from differentiating into different types of adult tissue. LIF activates STAT3 and blocks non-neural differentiation by induction of Myc, while BMP/Smad signaling through HS chains blocks neural differentiation by induction of Id. Wnt/b-catenin signaling through HS chains blocks primitive endodermal differentiation by induction of Nanog. FGF may contribute to proliferation through HS chains. HS chain dependent signaling by unknown factors may regulate proliferation and Oct3/4 expression.
Credit: Shoko Nishihara

Heparan sulfate, a carbohydrate molecule that coats certain proteins on the cell surface, is critical for the proper proliferation and potency of embryonic stem cells, researchers report.

Stem cells' tremendous therapeutic potential arises from their ability to continually self-renew and turn into any adult cell type. Researchers have long been trying to uncover the basis of these abilities, but while several proteins and growth factors are known to play a role both inside and outside the cell, the molecular mechanisms remain largely unknown.

Many of the stem-cell associated can attach to heparan sulfate molecules, so Shoko Nishihara and colleagues examined what would happen to mouse stem cells in cell culture if heparan sulfate production was reduced or blocked. They discovered that three of the major external factors promoting stem cell renewal (proteins called Wnt, FGF, and BMP) could not induce the proper signals inside the cell without heparan sulfate (HS).

As a result, HS deficient cells grew more slowly, and also spontaneously differentiated into other cells more often, at rates that correlated with the level of inhibition. Nishihara and colleagues propose that heparan sulfate might be the cell-surface component that mediates the external and internal signals promoting stem cell renewal, and could be an important target for stem cell engineering.


Story Source:

The above story is based on materials provided by American Society for Biochemistry and Molecular Biology. Note: Materials may be edited for content and length.


Cite This Page:

American Society for Biochemistry and Molecular Biology. "Carbohydrate Regulates Stem Cell Potency." ScienceDaily. ScienceDaily, 8 February 2008. <www.sciencedaily.com/releases/2008/02/080201131223.htm>.
American Society for Biochemistry and Molecular Biology. (2008, February 8). Carbohydrate Regulates Stem Cell Potency. ScienceDaily. Retrieved August 20, 2014 from www.sciencedaily.com/releases/2008/02/080201131223.htm
American Society for Biochemistry and Molecular Biology. "Carbohydrate Regulates Stem Cell Potency." ScienceDaily. www.sciencedaily.com/releases/2008/02/080201131223.htm (accessed August 20, 2014).

Share This




More Health & Medicine News

Wednesday, August 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: World's Oldest Man Lives in Japan

Raw: World's Oldest Man Lives in Japan

AP (Aug. 20, 2014) A 111-year-old Japanese was certified as the world's oldest man by Guinness World Records on Wednesday. Sakari Momoi, a native of Fukushima in northern Japan, was given a certificate at a hospital in Tokyo. (Aug. 20) Video provided by AP
Powered by NewsLook.com
Ebola-Hit Sierra Leone's Freetown a City on Edge

Ebola-Hit Sierra Leone's Freetown a City on Edge

AFP (Aug. 19, 2014) Residents of Sierra Leone's capital voice their fears as the Ebola virus sweeps through west Africa. Duration: 00:56 Video provided by AFP
Powered by NewsLook.com
101-Year-Old Working Man Has All The Advice You Need

101-Year-Old Working Man Has All The Advice You Need

Newsy (Aug. 19, 2014) Herman Goldman has worked at the same lighting store for almost 75 years. Find out his secrets to a happy, productive life. Video provided by Newsy
Powered by NewsLook.com
Researcher Testing on-Field Concussion Scanners

Researcher Testing on-Field Concussion Scanners

AP (Aug. 19, 2014) Four Texas high school football programs are trying out an experimental system designed to diagnose concussions on the field. The technology is in response to growing concern over head trauma in America's most watched sport. (Aug. 19) Video provided by AP
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