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a Noll Physiological Research Center, The Pennsylvania State University, University Park.
b The Human Performance Laboratory, Department of Kinesiology, The University of Connecticut, Storrs.
c Military Performance Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts.
d Department of Cellular and Molecular Physiology, Hershey Medical Center, The Pennsylvania State University, Hershey.
Lars Larsson, Noll Physiological Research Center, The Pennsylvania State University, 129 Noll Laboratory, University Park, PA 16802 E-mail: lgl5{at}psu.edu.
Decision Editor: John A. Faulkner, PhD
The purpose of this investigation was to determine the role played by pretranslational events in the decreased rate of myosin heavy-chain (MyHC) protein synthesis in old age. It was hypothesized that the decreased rate of MyHC protein synthesis reported in the elderly population is, at least in part, related to lower MyHC messenger RNA (mRNA) in old age. MyHC protein expression and mRNA levels for the three MyHC isoforms expressed in human muscle, that is, types I, IIa, and IIx/d, were measured in percutaneous vastus lateralis muscle biopsies from 16 young and 16 old healthy men. The MyHC isoform mRNA content was determined by quantitative, real-time reverse transcriptase polymerase chain reaction, and it was normalized to 18S ribosomal RNA; the relative MyHC protein isoform content was measured on silver-stained 7% sodium dodecyl sulfate–polyacrylamide gel electrophoresis gels. The old men demonstrated signs of sarcopenia, such as loss of muscle force, a trend toward a loss in lean body mass, and an increased percentage of body fat. Statistically significant correlations were observed between the isoform expression of different MyHCs at the protein and mRNA levels. However, the expression of the different MyHC isoforms at the mRNA and protein levels did not differ between the young and old men. Thus, the present results do not support the hypothesis that pretranslational events in MyHC protein synthesis are playing a significant role in the development of sarcopenia.
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