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Changes in protein distribution in normal and protein-deficient rats during an acute-phase ‘injury’ response

Published online by Cambridge University Press:  09 March 2007

G. Jennings  and
M. Elia
G. Jennings
Affiliation:
Dunn Nutrition Unit, Downhams Lane, Milton Road, Cambridge CB4 4XJ
M. Elia
Affiliation:
Dunn Nutrition Unit, Downhams Lane, Milton Road, Cambridge CB4 4XJ
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Abstract

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The present study investigated the effect of the acute-phase ‘injury’ response, induced by subcutaneous injection of turpentine, on the hydration and protein content of organs and tissues of normally nourished rats receiving a diet containing 200g protein/kg, and of protein-malnourished rats receiving a diet containing 30 g protein/kg. The measurements were carried out 48 h after turpentine injection, and were compared with both saline-injected animals, and pair-fed control animals. Circulating α2-macroglobulin was also measured as an index of the acute-phase-protein response. In normally nourished rats turpentine injection caused a significant increase in the mean masses of the liver, kidney and lung (7–35% compared with saline-injected animals, and 20–44% compared with pair-fed controls), and a small reduction in the mass of extra-abdominal and extrathoracic tissues (‘carcass’). In general the protein content of tissues changed in a similar way (for liver, kidney and lung a 16–33% increase compared with saline-injected animals, and 32–49% compared with pair-fed controls). Protein deficiency produced a significant attenuation in the response to turpentine. The change in the mass and protein content of several tissues was reduced (for lung, liver and kidney, the increase in protein content was only 5–15%), and the effects on anorexia (1 v. 41% reduction infood intake) and the α2,-macroglobulin response (1·28 v. 4·28 g/l; P< 0·001) were also reduced. It is concluded that the injury response spares most central thoracic and abdominal organs, but this effect as well as the anorexia and acute-phase-protein response to injury are attenuated by protein deficiency.

Keywords

Protein deficiencyAcute-phase responseInjury
Type
General Nutrition
Information
British Journal of Nutrition , Volume 76 , Issue 1 , July 1996 , pp. 123 - 132
Copyright
Copyright © The Nutrition Society 1996

References

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