Journal of Applied Physiology AJP: Endocrinology and Metabolism
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J Appl Physiol 102: 2389-2397, 2007. First published February 8, 2007; doi:10.1152/japplphysiol.01202.2006
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INVITED REVIEW

HIGHLIGHTED TOPIC
Free Radical Biology in Skeletal Muscle

Oxidative stress and disuse muscle atrophy

Scott K. Powers, Andreas N. Kavazis, and Joseph M. McClung

Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida

Skeletal muscle inactivity is associated with a loss of muscle protein and reduced force-generating capacity. This disuse-induced muscle atrophy results from both increased proteolysis and decreased protein synthesis. Investigations of the cell signaling pathways that regulate disuse muscle atrophy have increased our understanding of this complex process. Emerging evidence implicates oxidative stress as a key regulator of cell signaling pathways, leading to increased proteolysis and muscle atrophy during periods of prolonged disuse. This review will discuss the role of reactive oxygen species in the regulation of inactivity-induced skeletal muscle atrophy. The specific objectives of this article are to provide an overview of muscle proteases, outline intracellular sources of reactive oxygen species, and summarize the evidence that connects oxidative stress to signaling pathways contributing to disuse muscle atrophy. Moreover, this review will also discuss the specific role that oxidative stress plays in signaling pathways responsible for muscle proteolysis and myonuclear apoptosis and highlight gaps in our knowledge of disuse muscle atrophy. By presenting unresolved issues and suggesting topics for future research, it is hoped that this review will serve as a stimulus for the expansion of knowledge in this exciting field.

oxidants; proteasome; calpain; caspase-3; reactive oxygen species


Address for reprint requests and other correspondence: S. K. Powers, Dept. of Applied Physiology and Kinesiology, PO Box 118205, Univ. of Florida, Gainesville, FL 32611 (e-mail: spowers{at}hhp.ufl.edu)




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