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1 Department of Physiology and Pennsylvania Muscle Institute, University of Pennsylvania, Philadelphia, PA, USA
2 Department of Radiation Oncology, University of Pennsylvania, Philadelphia, PA, USA
* To whom correspondence should be addressed. E-mail: lamorris{at}mail.med.upenn.edu.
Skeletal muscle atrophy in response to a number of muscle wasting conditions, including disuse, involves the induction of increased protein breakdown, decreased protein synthesis, and likely a variable component of apoptosis. The increased activation of specific proteases in the atrophy process presents a number of potential therapeutic targets to reduce muscle atrophy via protease inhibition. In this study, mice were provided with food supplemented with the Bowman-Birk inhibitor (BBI), a serine protease inhibitor known to reduce the proteolytic activity of a number of proteases such as chymotrypsin, trypsin, elastase, cathepsin G and chymase. Mice fed the BBI diet were suspended for 3-14 days and the muscle mass and function were then compared to suspended mice on a normal diet. The results indicate that dietary supplementation with BBI significantly attenuates the normal loss of muscle mass and strength following unloading. Furthermore, the data reveal the existence of yet uncharacterized serine proteases that are important contributors to the evolution of disuse atrophy, since BBI inhibited serine protease activity that was elevated following hindlimb unloading and also slowed the loss of muscle fiber size. These results demonstrate that targeted reduction of protein degradation can limit the severity of muscle mass loss following hindlimb unloading. Thus, BBI is a candidate therapeutic agent to minimize skeletal muscle atrophy and loss of strength associated with disuse, cachexia, sepsis, weightlessness or the combination of age and inactivity.
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