The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 168, 95-105, Copyright © 1988 by Rockefeller University Press


ARTICLES

Tolerance to tumor necrosis factor in rats and the relationship to endotoxin tolerance and toxicity

DL Fraker, MC Stovroff, MJ Merino and JA Norton
Surgical Metabolism Section, National Cancer Institute, Bethesda, Maryland 20892.

Treatment of rats with recombinant human TNF initially causes a marked decrease in food intake, a loss of body weight, and a negative nitrogen balance. These alterations normalize with continued twice daily intraperitoneal injections of the same dose. Rats tolerized to TNF in this manner are refractory to a lethal dose of TNF. Also, TNF- pretreated and -tolerized rats have prolonged survival and reversed histopathologic changes after injection of a lethal dose of endotoxin compared with control animals. The TNF-tolerant state is dependent on the dose of TNF used and the length of TNF pretreatment. TNF-induced tolerance is relatively short lived, being present 2-4 d after TNF pretreatment and dissipating by 2 wk. Rats made tolerant to endotoxin are also tolerant to a lethal dose of TNF. A bidirectional crossreacting tolerance exists between TNF and endotoxin. The mechanism of TNF tolerance is unclear, but it does not appear to be due to a humoral immune response or a perturbation of the uptake and clearance of injected TNF.
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