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Am J Physiol Endocrinol Metab 270: E430-E437, 1996;
0193-1849/96 $5.00
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AJP - Endocrinology and Metabolism, Vol 270, Issue 3 E430-E437, Copyright © 1996 by American Physiological Society

ARTICLES

IL-1 receptor antagonist attenuates sepsis-induced alterations in the IGF system and protein synthesis

C. H. Lang, J. Fan, R. Cooney and T. C. Vary
Department of Surgery, State University of New York at Stony Brook, New York 11794-8191, USA.

The purpose of the present investigation was to determine whether endogenously produced interleukin (IL)-1 mediates the changes in insulin-like growth factor (IGF) I and IGF binding proteins (IGFBP) induced by chronic abdominal sepsis in rats and to correlate the changes in the IGF system with the alternations in protein synthesis. A constant infusion of IL-1 receptor antagonist (IL-1ra) was begun after the induction of sepsis and was continued for 5 days. Sepsis decreased IGF-I levels in the blood, liver, and gastrocnemius muscle, increased the content in the kidney, and did not alter IGF-I levels in heart, jejunum, and spleen. IL-1ra attenuated the sepsis-induced decrease in plasma IGF-I and completely prevented the changes in IGF-I observed in liver, kidney, and the gastrocnemius. IGFBP-1 was increased in the blood, liver, and muscle of septic rats. IL-1ra prevented this increase in IGFBP-1 in blood and liver but not in muscle. The rate of in vivo protein synthesis was decreased in the gastrocnemius and kidney and unaltered in the heart, liver, jejunum, and spleen. A strong linear correlation existed between levels of IGF-I and the rate of protein synthesis determined simultaneously in the gastrocnemius. These results provide evidence for the role of IL-1 as an endogenous mediator of the sepsis-induced changes in IGF-I and IGFBP-1 and suggest that the accompanying changes in muscle protein synthesis are partially mediated via changes in IGF-I.


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