Growing strong muscles without working out? 'Hulk' protein, Grb10, controls muscle growth

"By identifying a novel mechanism regulating muscle development, our work has revealed potential new strategies to increase muscle mass," said Lowenna J. Holt, Ph.D., a study author from the Diabetes and Obesity Research Program at the Garvan Institute of Medical Research in Sydney, Australia. "Ultimately, this might improve treatment of muscle wasting conditions, as well as metabolic disorders such as Type 2 diabetes."

To make this discovery, Holt and colleagues compared two groups of mice. Once group had disruption of the Grb10 gene, and were very muscular. The other group, where the Grb10 gene was functional, had normal muscles. Researchers examined the properties of the muscles in both adult and newborn mice and discovered that the alterations caused by loss of Grb10 function had mainly occurred during prenatal development. These results provide insight into how Grb10 works, suggesting that it may be possible to alter muscle growth and facilitate healing, as the processes involved in muscle regeneration and repair are similar to those for the initial formation of muscle.

"Don't turn in your gym membership just yet," said Gerald Weissmann, M.D., Editor-in-Chief of The FASEB Journal. "If you want big muscles, the classic prescription still applies: lift heavy things, eat and sleep right, and have your hormones checked. But this study shows that when we understand the basic science of how muscle fibers grow and multiply, we will be able to lift the burden -- literally -- of muscle disease for many of our patients."