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In vivo uptake of [14C]leucine by skeletal muscle ribosomes after injury in rats fed two levels of protein*

Published online by Cambridge University Press:  09 March 2007

V. R. Young  and
P. C. Huang
V. R. Young
Affiliation:
Department of Nutrition and Food Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
P. C. Huang
Affiliation:
Department of Nutrition and Food Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
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Abstract

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1. After 14 days on a diet containing 5 or 25% casein male rats received a fracture of the left femur. Four hours before they were killed the injured and control rats were injected with [1-14C]leucine; the incorporation of radioactivity into an isolated fraction of skeletal muscle ribosomes was studied 6, 12, 24, 48, 72, 96 and 228 h after injury.

2. The incorporation of [14C]leucine into the ribosome fraction in right thigh muscles dropped to 40% of control values 72 h after fracture in well-nourished rats and after 96 h with diets containing 5 or 25%, casein.

3. The specific activity of the trichloroacetic acid-soluble fraction of muscle from injured rats was equal to or higher than that of the controls during the first 72 h but lower at 96 h.

4. These results suggest that a reduced incorporation of amino acids by ribosomes from the right thigh muscle occurred on day 3 after fracture in the group receiving 25% casein but not in the group receiving 5% casein.

5. Muscle RNA and DNA concentrations were not affected by the injury.

6. The relationship between these findings and the loss of muscle N after injury is discussed.

Type
Research Article
Information
British Journal of Nutrition , Volume 23 , Issue 2 , June 1969 , pp. 271 - 280
Copyright
Copyright © The Nutrition Society 1969

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