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. 1990 Jan;58(1):217–221. doi: 10.1128/iai.58.1.217-221.1990

Endotoxic induction of prostaglandin release from macrophages by nontoxic lipid A analogs synthesized chemically.

K Tanamoto 1, U Shade 1, E T Rietschel 1, S Kusumuto 1, T Shiba 1
PMCID: PMC258432  PMID: 2294051

Abstract

The ability of synthetic lipid A analogs to induce prostaglandin synthesis in macrophages was compared with that of native lipopolysaccharide. The synthetic preparations comprised monomeric or dimeric derivatives of D-glucosamine with different patterns of substitution by phosphate and tetradecanoic, (R)-3-hydroxytetradecanoic, and (R)-3-tetradecanoyloxytetradecanoic acid. All of these preparations are structurally distinct from native lipid A (principally regarding the position of fatty acid substitution) and hence have been previously shown to be endotoxically inactive in many biological tests. It was found that many of these synthetic samples exhibit strong activity in inducing prostaglandin E2 and prostaglandin F2 alpha, with some of them having activity comparable to that of lipopolysaccharide. Experiments with macrophages of C3H/HeJ mice enabled us to differentiate between endotoxin-specific (in the case of dimeric preparations) and endotoxin-nonspecific (for monomeric preparations) mechanisms for the induction of prostaglandins. These results indicate that there is a difference in the mechanism of induction of prostaglandin synthesis between monomeric lipid A's and dimeric or native lipid A structures.

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Selected References

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