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. 1982 Jan;35(1):133–137. doi: 10.1128/iai.35.1.133-137.1982

N-acetyl muramyl dipeptide stimulation of bone resorption in tissue culture.

F E Dewhirst
PMCID: PMC351006  PMID: 7054120

Abstract

N-Acetyl-muramyl-L-alanyl-D-isoglutamine (MDP), a structurally defined fragment of bacterial peptidoglycan, stimulated significant release of previously incorporated 45Ca from fetal rat bones in tissue culture over the concentration range of 0.1 to 10.0 micrograms/ml. MDP-Stimulated bone resorption was not inhibited by the addition of the prostaglandin synthetase inhibitor indomethacin to the culture medium. MDP was neither mitogenic for nor stimulated the release of osteoclast-activating factor from cultured human peripheral blood mononuclear cells. Thus, MDP-stimulated bone resorption in vitro is mediated by a mechanism which is not dependent upon prostaglandins or osteoclast-activating factor. 6-O-Stearoyl-N-acetyl-muramyl-L-alanyl-D-isoglutamine, a lipophilic analog of MDP, was slightly more potent than MDP. Two diastereomers of MDP, N-acetyl-muramyl-L-alanyl-L-isoglutamine and N-acetyl-muramyl-D-alanyl-D-isoglutamine, which are inactive as adjuvants, were at least 1,000 times less active than MDP in stimulating bone resorption. The stereochemical specificity for bone-resorptive activity paralleled that required for adjuvant activity, macrophage activation, and activation of the reticuloendothelial system.

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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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