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Estimation of tissue protein synthesis in sheep during sustained elevation of plasma leucine concentration by intravenous infusion

Published online by Cambridge University Press:  09 March 2007

A. L. Schaefer ,
S. R. Davis  and
G. A. Hughson
A. L. Schaefer
Affiliation:
New Zealand Ministry of Agriculture and Fisheries Research Division, Ruakura Agricultural Research Centre, Hanzilron, New Zealand
S. R. Davis
Affiliation:
New Zealand Ministry of Agriculture and Fisheries Research Division, Ruakura Agricultural Research Centre, Hanzilron, New Zealand
G. A. Hughson
Affiliation:
New Zealand Ministry of Agriculture and Fisheries Research Division, Ruakura Agricultural Research Centre, Hanzilron, New Zealand
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Abstract

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1. The fractional rate of protein synthesis (FSR) was determined in skeletal muscle, liver, rumen and cardiac muscle of wether sheep by continuous intravenous infusion of L–[4,5–3H]leucine accompanied by infusion of 0, 7.6, 15.2 or 22.8 mmol leucine/h (three sheep per treatment). FSR was calculated assuming plasma (ksp) or intracellular (ksi) leucine-specific radioactivity (SRA) was representative of the leucine precursor pool SRA for protein synthesis.

2. Plasma leucine concentration (plateau) was linearly related to leucine infusion rate, 22.8 mmol/h evoking tenfold increase in plasma concentration.

3. Difference between plasma leucine SRA and intracellular leucine SRA in all tissues diminished as plasma leucine concentration increased.

4. There were significant differences between ksi and kap estimates for liver and rumen in control sheep.

5. As leucine infusion rate increased, differences between kri and kag, diminished in all tissues. With increasing leucine infusion, in liver kst decreased and ksp was increased, in rumen kge decreased and ksp was stable, while in cardiac and skeletal muscle ksi and ksp both increased.

6. At a leucine infusion rate of 22.8 mmol/h, mean kap, and kst respectively were: rumen 1 1 (SE 2), 13 (SE 1); liver 19 (SE 2), 21 (SE 2); cardiac muscle 3–6 (SE 0.4), 3.8 (SE 0.3); skeletal muscle 4.1 (SE 0.2), 4.5 (SE 0.5) and did not differ significantly in any tissue.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 56 , Issue 1 , July 1986 , pp. 281 - 288
Copyright
Copyright © The Nutrition Society 1986

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