Abstract
Maintaining skeletal muscle mass and function throughout the entire lifespan is a prerequisite for good health and independent living. While skeletal muscle has an amazing ability for self-renewal and regeneration, its capacity to perform these tasks declines with age. The age-related loss in skeletal muscle mass and function, known as sarcopenia, is a major contributor to the increase in falls and fractures in the elderly. As such, it impacts dramatically upon the quality of life and independence of our aged community and places considerable stain on healthcare systems. At present there are no treatments which stop sarcopenia. Considerable research has focused on identifying the molecular signals which regulate skeletal muscle protein synthesis, degradation and regeneration and how these signals may be perturbed during the ageing process. Regulation of signalling hormones including growth hormone (GH) and insulin-like growth factor -1 (IGF-1), as well as the Akt (protein kinase B) and serum response factor (SRF) signalling pathways have been implicated in age-related changes in muscle protein synthesis and degradation. These factors, as well as those governing muscle stem cell renewal, are presently considered as potential therapeutic targets to combat age-related muscle wasting. This chapter will provide an overview of the age-related regulation of these molecular targets in skeletal muscle.
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Russell, A.P., Lèger, B. (2011). Age-Related Changes in the Molecular Regulation of Skeletal Muscle Mass. In: Lynch, G. (eds) Sarcopenia – Age-Related Muscle Wasting and Weakness. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9713-2_10
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