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Dietary protein intake and 3-methylhistidine excretion in the rat

Published online by Cambridge University Press:  09 March 2007

L. C. Ward  and
P. J. Buttery
L. C. Ward
Affiliation:
Department of Applied Biochemistry and Nutrition, University of Nottingham, School of Agriculture, Sutton Bonington, Loughborough, LE12 5RD
P. J. Buttery
Affiliation:
Department of Applied Biochemistry and Nutrition, University of Nottingham, School of Agriculture, Sutton Bonington, Loughborough, LE12 5RD
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Abstract

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1. Rats were fed for 14 d on diets containing 50, 150 or 250 g/kg casein as the protein source. The daily excretion of Nt-methylhistidine (His(τMe)), a non-re-utilized amino acid, was determined.

2. His(τMe) excretion/100 g body-weight appeared to be unaffected by increasing the concentration of dietary protein from 150 to 250 g/kg. Assuming no change in the proportion of muscle in the animals these results are indicative of no change in myofibrillar protein catabolic rate. The excretion rate/100 g body-weight of the animal given 50 g/kg casein was lower than the other two treatments, especially towards the end of the 14 d treatment period. Thus at this time the myofibrillar-protein catabolic rate was lower than in the animals fed on the higher protein diet.

3. In the animals fed on the high protein diet there was a tendency for this (τMe) excretion rate/100 g body-weight to increase with age.

4. Nitrogen balance and creatinine excretion results are also presented.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 44 , Issue 3 , November 1980 , pp. 381 - 390
Copyright
Copyright © The Nutrition Society 1980

References

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