Journal of Applied Physiology
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J Appl Physiol 71: 1020-1024, 1991;
8750-7587/91 $5.00
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Journal of Applied Physiology, Vol 71, Issue 3 1020-1024, Copyright © 1991 by American Physiological Society

ARTICLES

Protein synthesis in adult skeletal muscle after tenotomy: responses to fasting and insulin infusion

A. G. Baillie and P. J. Garlick
Rowett Research Institute, Bucksburn, Aberdeen, United Kingdom.

Muscle growth was established in specific muscles in the hindlimb of adult female rats by tenotomy of the gastrocnemius muscle. Seven days after surgery there was an increase in the wet weight of the soleus (Sol) and plantaris (P) muscles and a decrease in that of the gastrocnemius (G) muscle from the tenotomized limb compared with the respective control muscles from the contralateral limb from the same animal. In all three muscles there was a significant increase in the fractional rate of protein synthesis (ks) in the muscles from the tenotomized limb above the rate of the respective control muscles. In contrast, the extensor digitorum longus (EDL) muscle showed no change in wet weight or ks 7 days after tenotomy of G. Fasting for 12 or 36 h had no significant effect on ks in G, P, or Sol muscles from either the control or tenotomized limbs. In EDL from the control limb, both fasting periods resulted in a significant decrease in ks, although this effect was not seen in the EDL from the tenotomized limbs of the same animals. A subsequent 30-min insulin infusion was similarly ineffectual in G, P, and Sol, with its only effect evident in the EDL from the control limb, where it was sufficient to reverse the decreased ks resulting from the fasting, even though after 36 h fasting the reversal was only partial.


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