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The effect of manipulating growth in sheep by diet or anabolic agents on plasma cortisol and muscle glucocorticoid receptors

Published online by Cambridge University Press:  09 March 2007

P. M. Sharpe ,
P. J. Buttery  and
N. B. Haynes
P. M. Sharpe
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leics LEI2 5RD
P. J. Buttery
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leics LEI2 5RD
N. B. Haynes
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leics LEI2 5RD
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Abstract

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1. The cortisol status (total plasma cortisol concentration, free cortisol concentration, transcortin capacity) and the characteristics of skeletal muscle binding for cortisol and dexamethasone were examined in female lambs either implanted with Zeranol or trenbolone acetate or whose dietary intake was restricted.

2. The skeletal muscle glucocorticoid receptor had a high affinity for the glucocorticoid triamcinolone (relative binding affinity 0.85) and cortisol (relative binding affinity 0.51) with virtually no affinity for trenbolone.

3. Trenbolone acetate treatment reduced the binding capacity of sheep skeletal muscle for cortisol within 2 d of implantation. The other treatments had little effect except a small reduction in the animals where food intake was restricted. Similarly, binding capacity for dexamethasone was reduced by trenbolone acetate treatment but was not affected by the other treatments. This reduction in trenbolone acetate-treated animals is, at least in part, due to a reduction in glucocorticoid receptors.

4. Transcortin capacity was elevated by Zeranol treatment but reduced with diet restriction or trenbolone treatment.

5. No support for the suggestion of free cortisol concentration being important in the growth-promoting mechanism of trenbolone or Zeranol was obtained.

6. Although insulin concentrations were not significantly altered by treatment (P > 0.05), when combining all the animals there was evidence of a negative correlation between total cortiso1: insulin vaue (P < 0.05) or free cortisol: insulin value and growth rate (P < 0.001). Free cortisol was negatively correlated to growth rate (P < 0.05) and transcortin capacity positively correlated (P < 0.01).

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 56 , Issue 1 , July 1986 , pp. 289 - 304
Copyright
Copyright © The Nutrition Society 1986

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