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Treatment of Endotoxemic Mice With Anti—Interleukin-6 Antibody Paradoxically Increases Interleukin-6 Levels and Stimulates Mucosal Protein Synthesis

Quan Wang, MD; Josef E. Fischer, MD; Per-Olof Hasselgren, MD
Arch Surg. 1997;132(1):82-88. doi:10.1001/archsurg.1997.01430250084018.
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Objective:  To test the role of interleukin-6 (IL-6) in the regulation of mucosal protein synthesis during endotoxemia.

Experimental Design:  Three series of experiments were performed: (1) mice were injected with different doses of lipopolysaccharide (LPS) and protein synthesis was measured in jejunal mucosa at various time points up to 24 hours after injection of LPS; (2) mice were pretreated with anti—IL-6 antibody before injection of LPS; and (3) mice were injected with recombinant IL-6 and mucosal protein synthesis was measured 24 hours later.

Results:  Treatment of mice with LPS resulted in a dose- and time-dependent increase in mucosal protein synthesis. Pretreatment of endotoxemic mice with anti—IL-6 antibody resulted in a paradoxical increase in plasma and tissue levels of IL-6 and a further increase in mucosal protein synthesis. Administration of IL-6 to normal mice resulted in increased mucosal protein synthesis.

Conclusion:  The increase in mucosal protein synthesis seen during endotoxemia may be regulated at least in part by IL-6.Arch Surg. 1997;132:82-88


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