Abstract
Berry, L. Joe (Bryn Mawr College, Bryn Mawr, Pa.), and Dorothy S. Smythe. Some metabolic aspects of tolerance to bacterial endotoxin. J. Bacteriol. 90:970–977. 1965.—The tolerance to bacterial endotoxins which is produced in mice given a series of daily injections of heat-killed Salmonella typhimurium failed to occur when actinomycin D was administered with the heat-killed cells. Neither ethionine nor 2-thiouracil, when given with endotoxin, altered the development of tolerance. An injection of endotoxin, actinomycin D, or ethionine lowered the activity of the liver enzyme tryptophan pyrrolase more significantly at either 4 or 17 hr postinjection in normal mice than in tolerant mice. Similarly, an injection of either saccharated iron oxide or Thorotrast lowered liver tryptophan pyrrolase activity more extensively in normal than in tolerant animals. Activation of the reticuloendothelial system (RES) of tolerant mice, as determined by an accelerated rate of carbon clearance from the blood, was observed, but this was prevented by the appropriate dose of actinomycin D. Similar results were obtained when saccharated iron oxide, rather than endotoxin, was used to activate the RES, but these animals were not resistant to endotoxin and their tryptophan pyrrolase was normally diminished after an injection of endotoxin. Thus, RES activation may occur without tolerance developing. A more nearly normal level of enzyme activity appears to be characteristic of the tolerant state.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
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