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CUTTING EDGE |








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Department of Host Defense, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan;
Core Research for Evolutional Science and Technology of Japan Science and Technology Corporation, Osaka, Japan;
Institute of Immunology, Philipps University, Marburg, Germany; and
Immunobiology Research Group, Gesellschaft für Biotechnologische Forschung, Braunschweig, Germany
Mycoplasmas and their membranes are potent activators of macrophages, the active principle being lipoproteins and lipopeptides. Two stereoisomers of the mycoplasmal lipopeptide macrophage-activating lipopeptide-2 (MALP-2) differing in the configuration of the lipid moiety were synthesized and compared in their macrophage-activating potential, the R-MALP being >100 times more active than the S-MALP in stimulating the release of cytokines, chemokines, and NO. To assess the role of the Toll-like receptor (TLR) family in mycoplasmal lipopeptide signaling, the MALP-2-mediated responses were analyzed using macrophages from wild-type, TLR2-, TLR4-, and MyD88-deficient mice. TLR2- and MyD88-deficient cells showed severely impaired cytokine productions in response to R- and S-MALP. The MALP-induced activation of intracellular signaling molecules was fully dependent on both TLR2 and MyD88. There was a strong preference for the R-MALP in the recognition by its functional receptor, TLR2.
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