Navigation Links
New insight into factors that drive muscle-building stem cells

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
Cell Press

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:
(Date:11/25/2015)... ... November 25, 2015 , ... For the first time, Vitalalert ... Organizations, One Beat ” campaign. The partnership between the two groups began in 2014 ... MAP International’s cause. , MAP International was founded in 1954 and is an international ...
(Date:11/25/2015)... ... November 25, 2015 , ... On November 25, 2015, officials of ... Narconon network, announced the release of a new cutting edge recovery program that has ... been working with drug- and alcohol-addicted individuals with the purpose to free addicts from ...
(Date:11/25/2015)... ... , ... Smiles by Stevens is pleased to announce the addition ... many patients are aware of the benefits of Botox® in the treatment of moderate ... with discomfort, soreness, and pain as a result of Jaw Tension, TMJ (temporo-mandibular joint) ...
(Date:11/25/2015)... ... , ... In an ongoing Clinical Study conducted by an independent physician, Andrew ... is evaluating the efficacy of its product and its disinfection protocol. This study is ... May 2014 through October 2015 at a 360-bed, acute-care, academic medical center located in ...
(Date:11/25/2015)... Silver Spring, Md (PRWEB) , ... November 25, ... ... the Pulmonary Hypertension Association (PHA) announces the nation’s Periwinkle Pioneers, individuals and groups ... the history of this disease. The Periwinkle Pioneers, nominated by the public, will ...
Breaking Medicine News(10 mins):
(Date:11/26/2015)... , 26 november 2015 ... kondigt de geplande investering aan van ten ... de laboratoria en het mondiale hoofdkantoor in ... uitbreiding zal resulteren in extra kantoorruimte en ... aan de groeiende behoeften van de farmaceutische ...
(Date:11/26/2015)... -- --> --> Juntendo ... optimal contrast weighting of MRI for patients with Multiple ... research agreement with SyntheticMR in order to use SyMRI in ... possible to generate multiple contrast images from a single scan ... thus making it possible to both fine tune images and ...
(Date:11/26/2015)... DUBLIN , Nov. 26, 2015 ... the addition of the "2016 Future Horizons ... Monitoring (TDM) Market: Supplier Shares, Country Segment Forecasts, ... offering. --> ... comprehensive analysis of the Japanese therapeutic drug monitoring ...
Breaking Medicine Technology: