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Adaptations in protein metabolism during lactation in the rat

Published online by Cambridge University Press:  09 March 2007

Donald J. Naismith  and
Siân M. Robinson
Donald J. Naismith
Affiliation:
Department of Food and Nutritional Sciences, King's College London, Kensington, London W8 7AH
Siân M. Robinson
Affiliation:
Department of Food and Nutritional Sciences, King's College London, Kensington, London W8 7AH
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Abstract

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1. The activities of two hepatic enzymes that participate in the regulation of amino acid oxidation and urea synthesis were measured in lactating rats (day 15 of lactation) and virgin controls. The enzymes were alanine aminotransferase (EC 2. 6. 1.2) and argininosuccinate synthase (EC 6. 3. 4.5). Carcasses of the dams were also analysed.

2. Changes in the activities of both enzymes in dams fed ad lib. on a diet containing an excess of protein indicated that amino acid oxidation was depressed. In dams restricted in protein to the level of intake of their controls but allowed to satisfy their needs for energy, enzyme activities were significantly reduced. In these animals lean tissue catabolism supplemented the dietary protein supply.

3. This adjustment in protein metabolism which effectively spares protein for milk-protein synthesis could be explained either by a reduction in the availability of substrate in the liver, or by the intervention of an anabolic hormone secreted in lactation.

Type
General Nutrition papers
Information
British Journal of Nutrition , Volume 58 , Issue 3 , November 1987 , pp. 533 - 538
Copyright
Copyright © The Nutrition Society 1987

References

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