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RhoA expression during recovery from skeletal muscle disuse.

J M McClung1, R W Thompson, L L Lowe

  • 1Department of Exercise Science, School of Public Health, University of South Carolina, Columbia, SC 29208, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 16, 2004
PubMed
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Skeletal muscle RhoA expression decreases with disuse but rapidly recovers upon reloading. This study investigated RhoA and associated proteins during disuse and reloading in rat hindlimbs.

Area of Science:

  • Muscle physiology
  • Cellular signaling
  • Molecular biology

Background:

  • Functional overload and anabolic steroids influence skeletal muscle RhoA expression.
  • RhoA signaling is crucial for cellular processes including muscle adaptation.

Purpose of the Study:

  • To determine RhoA and associated protein expression changes during skeletal muscle disuse and subsequent reloading.
  • Investigate the molecular mechanisms underlying muscle adaptation to altered mechanical loading.

Main Methods:

  • Male Sprague-Dawley rats underwent hindlimb suspension (disuse) followed by a period of reloading.
  • Quantitative analysis of RhoA, beta(1)-integrin, and Cdc42 protein and mRNA levels via Western blot and RT-PCR.

Main Results:

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  • Hindlimb suspension decreased RhoA protein and mRNA. Reloading rapidly restored RhoA levels.
  • Beta(1)-integrin and Cdc42 protein levels increased significantly after reloading, suggesting their involvement in recovery.
  • Muscle mass, indicated by the plantaris muscle-to-body weight ratio, recovered after reloading.

Conclusions:

  • Reduced RhoA expression and mRNA are early responses to skeletal muscle disuse.
  • Skeletal muscle demonstrates a rapid recovery of RhoA signaling pathways upon resumption of normal locomotion.