Navigation Links
New insight into factors that drive muscle-building stem cells
Date:1/8/2008

A report in the January issue of Cell Metabolism, a publication of Cell Press, provides new evidence explaining how stem cells known as satellite cells contribute to building muscles up in response to exercise. These findings could lead to treatments for reversing or improving the muscle loss that occurs in diseases such as cancer and AIDS as well as in the normal aging process, according to the researchers.

The researchers showed that a transient and local rise in an inflammatory signal, the cytokine known as interleukin-6 (IL-6), is essential for the growth of muscle fibers. The findings offer the first clear mechanism for the stem cells incorporation into muscle and the first evidence linking a cytokine to this process, said Pura Muoz-Cnoves of Universitat Pompeu Fabra in Barcelona, Spain. As we learn more about how muscles grow in adults, we may uncover new methods for restoring lost muscle mass in the elderly and ill, she added.

Skeletal muscles are made up of individual myofibers, each with many nuclei containing genetic material. As muscles are made to work harder, they adapt by bulking up each of those individual fibers, the researchers explained, but the mechanisms responsible have largely remained elusive.

Mounting evidence has shown that the growth of myofibers is limited by the need to maintain an equilibrium between the number of nuclei and the fibers overall volume. Because mature myofibers are incapable of cell division, new nuclei must be supplied by satellite cells (muscle stem cells). Once activated, satellite cells follow an ordered set of events, including proliferation, migration, and incorporation into the myofiber, leading to its growth.

Now, the researchers have found that IL-6 is an essential regulator in that process. While IL-6 was virtually undetectable in the muscles of control mice, animals whose muscles were made to work harder showed an increase in IL-6 after one day. That cytokine rise was maintained for two weeks before it declined again.

Interestingly, systemically high levels of IL-6 had earlier been implicated in the muscle wasting process, Muoz-Cnoves noted. Having excess IL-6 is bad, but its local translation is required for muscle growth.

The researchers further found that IL-6 was produced both within myofibers and in their associated satellite cells, leading to muscle growth. In contrast, the muscles of mice lacking IL-6 did not show any significant increase in size after several weeks of overloading. The researchers also showed that IL-6 exerts its effects by inducing the proliferation of satellite cells.

While Muoz-Cnoves said that the findings are just the beginning of a new line of investigation into how adult muscle grows, she added that they might ultimately provide a new avenue for muscle-building therapies.

Treatments could be designed to compensate for or block the pathways leading to muscle loss, she said. In muscles that have already lost mass, you might also be able to stimulate muscle growth.


'/>"/>

Contact: Cathleen Genova
cgenova@cell.com
617-397-2802
Cell Press
Source:Eurekalert

Related medicine news :

1. Insights into cell movement likely to aid immune study, cancer research
2. Patient-Centric Healthcare Study Reveals Key Insights for Pharmaceutical Marketers
3. New insights into deadly heart rhythm disorder
4. Neural Insights Could Bring Better Cochlear Implants
5. New technique reveals insights into lung disease
6. MDs reactions to pharma marketing influenced by brand, side effects: Management Insights
7. Elbit Imaging Ltd. Announces US$19,829,643 Investment in its Subsidiary InSightec Ltd., in an Internal Round of Financing
8. InSightec Ltd. Announces US$30 Million Investment Round
9. Cell Insights May Predict Breast Cancers Spread
10. Physics provides new insights on cataract formation
11. Aetna HSA Online Video Wins 2007 Insight Award for Customer Advocacy in Healthcare
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/5/2016)... ... 2016 , ... Spring Fertility , the only fertility ... egg freezing, today announced the grand opening of its first location in San ... Fertility offers both fertility preservation (egg, sperm, embryo, and testicular and ovarian tissue ...
(Date:5/5/2016)... ... May 05, 2016 , ... ... Wharton Seminars for Business Journalists , led by the Wharton School’s ... and economic issues.  This one-day program at the Wharton School’s San Francisco ...
(Date:5/5/2016)... ... May 05, 2016 , ... United Benefit Advisors (UBA), ... as the latest addition to its family of Partner Firms. Headquartered in Mount ... wellness, human resources, and health care consumerism specialists. , “Partnering with UBA will ...
(Date:5/5/2016)... ... May 05, 2016 , ... ... Make-A-Wish grants the most heartfelt wishes of these children. The wishes provide ... treatment. President and CEO of Make-A-Wish Mississippi, Brent Wilson said, “In 2016, ...
(Date:5/5/2016)... ... May 05, 2016 , ... Michael Lanteri Agency ... created to assist the people of their local community. The agency pledges to ... community leaders. Their hope is to bring awareness to important local causes with ...
Breaking Medicine News(10 mins):
(Date:5/4/2016)... Research and Markets has ... Ischemic Stroke Market and Competitive Landscape Highlights ...      (Logo: http://photos.prnewswire.com/prnh/20160330/349511LOGO ) ... Market and Competitive Landscape Highlights 2016, provides ... products, Acute Ischemic Stroke epidemiology, Acute Ischemic ...
(Date:5/4/2016)... , May 4, 2016 ... addition of the  "Global Actinic Keratosis Market ... to their offering.       (Logo: ... Keratosis Market and Competitive Landscape Highlights 2016, ... products, Actinic Keratosis epidemiology, Actinic Keratosis market ...
(Date:5/3/2016)... 4, 2016 Global Insulin ... profiling 09 key companies and supported with 272 ... in-depth study on the current state of the ... the industry including definitions, classifications, applications and industry ... provided for the international market including development history, ...
Breaking Medicine Technology: