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Department of Physiological Science, University of California, Los Angeles, Los Angeles, California 90095-1527, USA
1Correspondence: Department of Physiological Science, 621 Young Dr. S., University of California, Los Angeles, CA 90095-1527, USA. E-mail: jtidball{at}physci.ucla.edu
Previous findings have provided strong evidence that myostatin functions as a negative regulator of muscle mass during development and growth. In the present study, we test the hypothesis that myostatin may serve a similar function in fully differentiated muscle experiencing modified loading. Our findings show that myostatin expression can be modulated in fully differentiated, nonpathological skeletal muscle in a manner that is inversely related to changes in muscle mass. Atrophy of rat hind limb muscles induced by 10 days of unloading resulted in a 16% decrease in plantaris mass, a 110% increase in myostatin mRNA, and a 37% increase in myostatin protein. Immunohistochemical observations showed a detectable increase in myostatin concentration at myotendinous junctions during muscle unloading. The concentration of myostatin mRNA and protein returned to values not significantly different from ambulatory controls after 4 days of reloading, during which time plantaris mass also returned to control values. However, the results also show that periods of 30 min of daily muscle loading during the unloading period were sufficient to prevent significant losses of muscle mass caused by unloading, although myostatin mRNA still showed a 55% increase in concentration. Thus, significant increases in myostatin expression are not sufficient for muscle mass loss, although muscle mass loss during unloading is accompanied by increases in myostatin.—Wehling, M., Cai, B., Tidball, J. G. Modulation of myostatin expression during modified muscle use.
Key Words: atrophy • myotendinous junction • plantaris muscle • rat • unloading
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