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J Appl Physiol 90: 1174-1183, 2001;
8750-7587/01 $5.00
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Vol. 90, Issue 3, 1174-1183, March 2001

HIGHLIGHTED TOPICS
Plasticity in Skeletal, Cardiac, and Smooth Muscle
Selected Contribution: Skeletal muscle focal adhesion kinase, paxillin, and serum response factor are loading dependent

Scott E. Gordon1,2, Martin Flück1, and Frank W. Booth1,2

1 Department of Integrative Biology and Pharmacology, University of Texas-Houston Health Science Center, Houston, Texas 77030; and 2 Department of Veterinary Biomedical Sciences, University of Missouri, Columbia, Missouri 65211

This investigation examined the effect of mechanical loading state on focal adhesion kinase (FAK), paxillin, and serum response factor (SRF) in rat skeletal muscle. We found that FAK concentration and tyrosine phosphorylation, paxillin concentration, and SRF concentration are all lower in the lesser load-bearing fast-twitch plantaris and gastrocnemius muscles compared with the greater load-bearing slow-twitch soleus muscle. Of these three muscles, 7 days of mechanical unloading via tail suspension elicited a decrease in FAK tyrosine phosphorylation only in the soleus muscle and decreases in FAK and paxillin concentrations only in the plantaris and gastrocnemius muscles. Unloading decreased SRF concentration in all three muscles. Mechanical overloading (via bilateral gastrocnemius ablation) for 1 or 8 days increased FAK and paxillin concentrations in the soleus and plantaris muscles. Additionally, whereas FAK tyrosine phosphorylation and SRF concentration were increased by <= 1 day of overloading in the soleus muscle, these increases did not occur until somewhere between 1 and 8 days of overloading in the plantaris muscle. These data indicate that, in the skeletal muscles of rats, the focal adhesion complex proteins FAK and paxillin and the transcription factor SRF are generally modulated in association with the mechanical loading state of the muscle. However, the somewhat different patterns of adaptation of these proteins to altered loading in slow- vs. fast-twitch skeletal muscles indicate that the mechanisms and time course of adaptation may partly depend on the prior loading state of the muscle.

compensatory hypertrophy; atrophy; mechanical stress; fiber type; muscle growth


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