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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
A morphological/biochemical study on the actions of corticosteroids on rat skeletal muscle.
Muscle & Nerve 1986 January
Four corticosteroid hormones were administered (5 mg/kg/day) to rats over 6 to 10 days. Both biochemical and microscopic techniques were employed to determine the influence of these corticosteroids on the fine structure and growth of five striated muscles. Throughout, dexamethasone and triamcinalone were more potent than prednisone or cortisone in influencing muscle growth. The corticosteroids' action on the heart was anabolic, increasing its RNA and protein content. In contrast, the same corticosteroids were catabolic against fast-twitch muscles (e.g., extensor digitorum longus), inducing appreciable atrophy. However, slow-twitch muscles (e.g., soleus) were more resistant to these hormones, exhibiting an intermediate response between that of the heart and fast-twitch muscles. Only minor morphological changes were found in both fast and slow muscles 10 days after the corticosteroid treatments. The hormones' atrophic effects on skeletal muscle primarily arose from the corticosteroid's ability to inhibit protein synthesis, via decreases in the muscles' ribosomal capacities. Whole-body protein synthesis was also suppressed by these corticosteroids, but to a lesser extent than in the whole skeletal musculature.
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