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Effect of insulin on hind-limb and whole-body leucine and protein metabolism in fed and fasted lambs

Published online by Cambridge University Press:  09 March 2007

V. H. Oddy ,
D. B. Lindsay ,
P. J. Barker  and
A. J. Northrop
V. H. Oddy
Affiliation:
Agriculture and Food Research Council Institute of Animal Physiology, Babraham, Cambridge CB2 4AT
D. B. Lindsay
Affiliation:
Agriculture and Food Research Council Institute of Animal Physiology, Babraham, Cambridge CB2 4AT
P. J. Barker
Affiliation:
Agriculture and Food Research Council Institute of Animal Physiology, Babraham, Cambridge CB2 4AT
A. J. Northrop
Affiliation:
Agriculture and Food Research Council Institute of Animal Physiology, Babraham, Cambridge CB2 4AT
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Abstract

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1. A combination of isotope-dilution and arterio-venous difference techniques was used to determine rates of leucine metabolism and protein synthesis and degradation in a hind-limb preparation (predominantly muscle) and the whole body of eight lambs fed on milk to appetite and eight lambs fasted from 24 to 48 h.

2. Compared with fed lambs, fasted lambs showed decreased rates of protein synthesis in both whole body and hind-limb, and in hind-limb muscle, elevated rates of protein degradation.

3. The effects of two rates of insulin infusion on whole-body and hind-limb-muscle leucine metabolism, and in turn on protein metabolism, were determined. Insulin had no significant effect on leucine flux or oxidation (and hence protein synthesis and degradation) in whole-body or hind-limb muscle of fed lambs. In fasted lambs insulin progressively reduced arterial leucine concentration and whole-body leucine flux and oxidation, indicating a reduction in both protein synthesis and degradation. Insulin reduced the rate of leucine efflux from hind-limb muscle, which was followed by a reduction in leucine uptake. Insulin increased hind-limb-muscle glucose uptake in both fed and fasted lambs.

4. On the basis that hind-limb muscle was representative of skeletal muscle in general, we estimated that muscle accounted for the same percentage (about 27) of whole-body protein synthesis in both fed and fasted lambs. This percentage was unaffected by infusion of insulin, although the absolute rates differed in fed and fasted lambs.

Type
General Nutrition papers
Information
British Journal of Nutrition , Volume 58 , Issue 3 , November 1987 , pp. 437 - 452
Copyright
Copyright © The Nutrition Society 1987

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