mTOR-Dependent Control of Skeletal Muscle Protein Synthesis

in International Journal of Sport Nutrition and Exercise Metabolism
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Muscle mass is influenced by many factors including genetically programmed changes, hormonal state, level of activity, and disease processes. Ultimately, whether or not a muscle hypertrophies or atrophies is determined by a simple relationship between the rates of protein synthesis and degradation. When synthesis exceeds degradation, the muscle hypertrophies, and vice versa. In contrast to this simple relationship, the processes that control muscle protein synthesis and degradation are complex. Recently, significant progress has been made in understanding the biochemical mechanisms that control the rate of translation initiation, which is generally the limiting phase in protein synthesis.

The author is with the Departments of Pharmacology and Medicine at the University of Virginia School of Medicine, Charlottesville, VA 22908.

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