AJP - Endocrinology and Metabolism, Vol 262, Issue 5 E583-E590, Copyright © 1992 by American Physiological Society

ARTICLES

Trace element movement and oxidative stress in skeletal muscle atrophied by immobilization

H. Kondo, M. Miura, I. Nakagaki, S. Sasaki and Y. Itokawa
Department of Hygiene, Faculty of Medicine, Kyoto University, Japan.

The movements of trace elements and the level of oxidative stress in the soleus, a typical slow red muscle which, atrophied by immobilization, were investigated in designated intervals. Male Wistar rats (14 wk old) whose one ankle joints were immobilized in the extended position were killed after 4, 8, and 12 days. Fe, Zn, Mn, and Cu concentrations and the levels of thiobarbituric acid-reactive substance (TBARS) and glutathione were measured. The rate of atrophy increased rapidly until the 8th day and slowly after that. In whole muscle, Fe concentration kept increasing, and Zn and Mn increased temporarily. Their subcellular distributions also changed; especially, the Fe level of the microsomal fraction kept increasing and reached threefold at 12 days. Increased TBARS and glutathione disulfide and decreased total glutathione indicated the increased oxidative stress in atrophy, which might result from an increased Fe level, especially that of the microsomal fraction. Vitamin E injection lessened the rate of atrophy, which showed that oxidative stress accelerated muscle atrophy. This might be mediated by increased intracellular Ca. Also metallothionein was induced in muscle atrophy.

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