Featured Research

from universities, journals, and other organizations

Neural Stem Cells In Mice Affected By Gene Associated With Longevity

Date:
November 5, 2009
Source:
Stanford University Medical Center
Summary:
A gene associated with longevity in roundworms and humans has been shown to affect the function of stem cells that generate new neurons in the adult brain, according to researchers. The study in mice suggests that the gene may play an important role in maintaining cognitive function during aging.

A gene associated with longevity in roundworms and humans has been shown to affect the function of stem cells that generate new neurons in the adult brain, according to researchers at the Stanford University School of Medicine. The study in mice suggests that the gene may play an important role in maintaining cognitive function during aging.

"It's intriguing to think that genes that regulate life span in invertebrates may have evolved to control stem cell pools in mammals," said Anne Brunet, PhD, assistant professor of genetics. She is the senior author of the research, which will be published Nov. 6 in Cell Stem Cell.

Unlike your skin or your intestine, your adult brain doesn't make a lot of new cells. But those it does are critical to learning, memory and spatial awareness. To meet these demands, your brain maintains two small caches of neural stem cells, which can both self-renew and give rise to neurons and other cells known as oligodendrocytes and astrocytes. Properly balancing these functions allows you to generate new nerve cells as needed while also maintaining a robust neural stem cell pool.

As mice and other organisms age, the pool of neural stem cells in the brain shrinks and fewer new neurons are generated. These natural changes correlate with the gradual loss of cognitive ability and sensory functions that occur as we approach the end of our lives. However, the life span of some laboratory animals can be artificially extended by mutating genes involved in metabolism, and some humans outlive their life expectancy (about 70 years for someone born in 1960) by decades. Brunet and her colleagues wanted to know why.

The researchers studied a family of transcription factors called FoxO known to be involved in proliferation, differentiation and programmed cell death. FoxO genes are required for the extreme longevity seen in some strains of laboratory roundworms, and a single mutation in the FoxO3 gene has recently been associated with long life in Japanese, German, American and Italian populations.

"We wanted to know if FoxO3 could be involved in regulating the pool of neural stem cells," said Brunet. To do so, the researchers examined laboratory mice in which the FoxO3 gene was knocked out. While mice can live without FoxO3, such mice usually die from cancer between 12 and 18 months after birth. The normal life span of a laboratory mouse is about 30 months.

Brunet and her colleagues used mice of three different ages, both with and without the gene: 1-day-old (newborns), 3-month-old (young adult) and 1-year-old (middle age). They found that, overall, adult and middle-aged mice without FoxO3 had fewer neural stem cells than did age-matched mice with this regulatory protein. There were no significant differences between the newborn mice with and without FoxO3, suggesting that FoxO3 loss only affects adults.

The researchers also discovered that the few stem cells found in the adult mice without FoxO3 more rapidly churned out neural cell precursors -- those cells destined to become new neurons -- than did the mice with normal FoxO3 levels. In fact, the brains of the mice that lacked FoxO3 were heavier than the control group, perhaps because they were burning through their pool of neural stem cells by making too many new nerve cells.

When the researchers looked at the neural stem cell in a laboratory dish, they found that those from young and middle-aged adult mice lacking FoxO3 -- but not those from newborn mice -- seemed to be compromised in their ability to self-renew and to generate the three types of nerve cells. Further investigation bolstered their findings when they discovered that the FoxO3 protein regulates the expression of genes involved in quiescence and differentiation in cells.

The researchers concluded that FoxO3 may be needed for the stem cells to re-enter a waiting state called quiescence that normally occurs after dividing. Cells that are unable to enter quiescence are less able to self-renew and may lose their ability to become any of the three nerve cell types.

Together, the research results suggest that FoxO3 is important to regulate the pool of neural stem cells in the adult brain.

Although the researchers studied mice of varying ages, from birth to about one year, Brunet stressed that their current study does not address changes that might occur in FoxO3 levels or activity over time -- a technically difficult endeavor they are now pursuing.

"We suspect that indeed there will be some changes," said Brunet. "But they will be relatively subtle. We know that the level of FoxO3 doesn't vary drastically, but it's possible the protein becomes less active over a mouse's life span. Or perhaps it simply becomes overwhelmed by the accumulated molecular changes of aging."

Brunet and her colleagues, along with collaborators at the University of Arkansas, are working on creating a mouse in which FoxO3 levels are artificially elevated. If their theory about the function of the protein in the brain is correct, it's possible that the neural stem cell pools of these mice will be protected from the ravages of time.

"We're very interested in understanding how everything unravels during the aging process," said Brunet.

In addition to Brunet, other Stanford researchers involved in the work include postdoctoral scholars Valιrie Renault, PhD, Dervis Salih, PhD, and Ashley Webb, PhD; graduate students Victoria Rafalski, Alex Morgan and Saul Villeda; undergraduates Jamie Brett and Camille Guillerey; research assistant Pramod Thekkat; assistant professor of radiation oncology Nicholas Denko, MD, PhD; associate professor of neurosurgery Theo Palmer, PhD; and assistant professor of medicine and of pediatrics Atul Butte, MD, PhD.

The research was funded by the National Institutes of Health, the California Institute for Regenerative Medicine, the Brain Tumor Society, the Esther A. & Joseph Klingenstein Fund Inc., the American Federation for Aging Research, the National Science Foundation, the Lucile Packard Foundation for Children's Health and the National Library of Medicine.


Story Source:

The above story is based on materials provided by Stanford University Medical Center. Note: Materials may be edited for content and length.


Cite This Page:

Stanford University Medical Center. "Neural Stem Cells In Mice Affected By Gene Associated With Longevity." ScienceDaily. ScienceDaily, 5 November 2009. <www.sciencedaily.com/releases/2009/11/091105132450.htm>.
Stanford University Medical Center. (2009, November 5). Neural Stem Cells In Mice Affected By Gene Associated With Longevity. ScienceDaily. Retrieved July 28, 2014 from www.sciencedaily.com/releases/2009/11/091105132450.htm
Stanford University Medical Center. "Neural Stem Cells In Mice Affected By Gene Associated With Longevity." ScienceDaily. www.sciencedaily.com/releases/2009/11/091105132450.htm (accessed July 28, 2014).

Share This




More Health & Medicine News

Monday, July 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

$15B Deal on Vets' Health Care Reached

$15B Deal on Vets' Health Care Reached

AP (July 28, 2014) — A bipartisan deal to improve veterans health care would authorize at least $15 billion in emergency spending to fix a veterans program scandalized by long patient wait times and falsified records. (July 28) Video provided by AP
Powered by NewsLook.com
Traditional African Dishes Teach Healthy Eating

Traditional African Dishes Teach Healthy Eating

AP (July 28, 2014) — Classes are being offered nationwide to encourage African Americans to learn about cooking fresh foods based on traditional African cuisine. The program is trying to combat obesity, heart disease and other ailments often linked to diet. (July 28) Video provided by AP
Powered by NewsLook.com
West Africa Gripped by Deadly Ebola Outbreak

West Africa Gripped by Deadly Ebola Outbreak

AFP (July 28, 2014) — The worst-ever outbreak of the deadly Ebola epidemic grips west Africa, killing hundreds. Duration: 00:48 Video provided by AFP
Powered by NewsLook.com
Trees Could Save More Than 850 Lives Each Year

Trees Could Save More Than 850 Lives Each Year

Newsy (July 27, 2014) — A national study conducted by the USDA Forest Service found that trees collectively save more than 850 lives on an annual basis. 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