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Non-passaged muscle precursor cells from 32-month old rat skeletal muscle have delayed proliferation and differentiation

Authors

  • K. A. Zwetsloot,

    Corresponding author
    1. Department of Health, Leisure, and Exercise Science, Appalachian State University, Boone, NC, USA
    2. Institute for Health and Human Services, Appalachian State University, Boone, NC, USA
    • Department of Biomedical Sciences, University of Missouri, Columbia, MO, USA
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  • T. E. Childs,

    1. Department of Biomedical Sciences, University of Missouri, Columbia, MO, USA
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  • L. T. Gilpin,

    1. Department of Biomedical Sciences, University of Missouri, Columbia, MO, USA
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  • F. W. Booth

    1. Department of Biomedical Sciences, University of Missouri, Columbia, MO, USA
    2. Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, MO, USA
    3. Dalton Cardiovascular Institute, University of Missouri, Columbia, MO, USA
    4. Health Activity Center, University of Missouri, Columbia, MO, USA
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Correspondence: Kevin A. Zwetsloot, Ph.D., Department of Health, Leisure, and Exercise Science, Appalachian State University, ASU Box 32071, Boone, NC 28608. Tel.: +1 828 262 7281; Fax: +1 828 262 3138; E-mail: zwetslootka@appstate.edu

Abstract

Objectives

The systemic environment and satellite cell dysfunction have been proposed as important contributors in the development of sarcopenia and impaired skeletal muscle regrowth with ageing. In the present study, we investigated effects of serum age on proliferation of muscle precursor cells (MPCs) isolated from skeletal muscles of young and old rats.

Materials and methods

We examined proliferation and subsequent differentiation of non-passaged MPCs isolated from skeletal muscles of 1-, 3- and 32-month old rats over a 72-h time course, using a serum cross-over design.

Results and conclusions

We found no effect of serum age on MPC proliferation, but we did discover that MPCs isolated from skeletal muscle of 32-month old rats had delayed onset of, and exit from proliferation, compared to MPCs isolated from skeletal muscle of 1-month old rats. Delayed proliferation of MPCs from 32-month old rats was associated with delayed p38 MAPK phosphorylation, and MyoD and p21Cip1 protein expression. We also demonstrate that MPCs from 32-month old rats exhibited lower levels of muscle creatine kinase mRNA compared to 1-month old rats, but elevated levels of myogenin mRNA, when stimulated to differentiate after 36 h proliferation. These findings suggest that delayed entry and exit of the cell cycle observed in MPCs from 32-month old rats may compromise their ability to respond to differentiation stimuli and subsequently impair myogenic potential of 32-month old skeletal muscle, in this model.

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