Featured Research

from universities, journals, and other organizations

New Function For The Protein Bcl-xL: It Prevents Bone Breakdown

Date:
December 31, 2009
Source:
Journal of Clinical Investigation
Summary:
In blood cells, the protein Bcl-xL has a well-characterized role in preventing cell death by a process known as apoptosis. New research has now identified its functions in osteoclasts, cells that slowly breakdown bone (a process known as resorption). Surprisingly, not only does Bcl-xL prevent osteoclast apoptosis in mice, it also negatively regulates the bone-resorbing activity of osteoclasts.

In blood cells, the protein Bcl-xL has a well-characterized role in preventing cell death by a process known as apoptosis. However, its function(s) in osteoclasts, cells that slowly breakdown bone (a process known as resorption), has not been determined.

Related Articles


In addressing this issue, Sakae Tanaka and colleagues, at The University of Tokyo, Japan, have discovered that not only does Bcl-xL prevent osteoclast apoptosis in mice, it also negatively regulates the bone-resorbing activity of osteoclasts. They report their findings in the Journal of Clinical Investigation.

To determine the function of Bcl-xL in osteoclasts, the researchers generated mice lacking Bcl-xL only in osteoclasts. As in blood cells, Bcl-xL was shown to promote the survival of osteoclasts. Unexpectedly, however, the mutant mice exhibited marked osteopenia at one year of age. Further analysis indicated that the reduced bone mass was caused by increased osteoclast-mediated bone resorption and identified a potential underlying mechanism. Specifically, Bcl-xL was found to decrease the production of extracellular matrix proteins, which bind cell surface integrin molecules, leading to the activation of c-Src signaling pathways that are already known to promote osteoclast-mediated bone resorption.

Thus, in the absence of Bcl-xL, increased production of extracellular matrix proteins leads to increased osteoclast-mediated bone resorption.



Story Source:

The above story is based on materials provided by Journal of Clinical Investigation. Note: Materials may be edited for content and length.


Journal Reference:

  1. Iwasawa et al. The antiapoptotic protein Bcl-xL negatively regulates the bone-resorbing activity of osteoclasts in mice. Journal of Clinical Investigation, 2009; DOI: 10.1172/JCI39819

Cite This Page:

Journal of Clinical Investigation. "New Function For The Protein Bcl-xL: It Prevents Bone Breakdown." ScienceDaily. ScienceDaily, 31 December 2009. <www.sciencedaily.com/releases/2009/09/090914172339.htm>.
Journal of Clinical Investigation. (2009, December 31). New Function For The Protein Bcl-xL: It Prevents Bone Breakdown. ScienceDaily. Retrieved December 19, 2014 from www.sciencedaily.com/releases/2009/09/090914172339.htm
Journal of Clinical Investigation. "New Function For The Protein Bcl-xL: It Prevents Bone Breakdown." ScienceDaily. www.sciencedaily.com/releases/2009/09/090914172339.htm (accessed December 19, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Friday, December 19, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Kids Die While Under Protective Services

Kids Die While Under Protective Services

AP (Dec. 18, 2014) As part of a six-month investigation of child maltreatment deaths, the AP found that hundreds of deaths from horrific abuse and neglect could have been prevented. AP's Haven Daley reports. (Dec. 18) Video provided by AP
Powered by NewsLook.com
Dads-To-Be Also Experience Hormone Changes During Pregnancy

Dads-To-Be Also Experience Hormone Changes During Pregnancy

Newsy (Dec. 18, 2014) A study from University of Michigan researchers found that expectant fathers see a decrease in testosterone as the baby's birth draws near. Video provided by Newsy
Powered by NewsLook.com
Prenatal Exposure To Pollution Might Increase Autism Risk

Prenatal Exposure To Pollution Might Increase Autism Risk

Newsy (Dec. 18, 2014) Harvard researchers found children whose mothers were exposed to high pollution levels in the third trimester were twice as likely to develop autism. Video provided by Newsy
Powered by NewsLook.com
UN: Up to One Million Facing Hunger in Ebola-Hit Countries

UN: Up to One Million Facing Hunger in Ebola-Hit Countries

AFP (Dec. 17, 2014) Border closures, quarantines and crop losses in West African nations battling the Ebola virus could lead to as many as one million people going hungry, UN food agencies said on Wednesday. Duration: 00:52 Video provided by AFP
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