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- W1965918638 abstract "Macrophage-activating lipopeptide 2 (MALP-2), a mycoplasmal diacylated lipopeptide with palmitic acid moiety (Pam2), activates Toll-like receptor (TLR) 2 to induce inflammatory cytokines. TLR2 is known to mature myeloid dendritic cells (mDC) to drive mDC contact-mediated natural killer (NK) cell activation. Here we tested if MALP-2 activates NK cells through stimulation of TLR2 on mDC. Although synthetic MALP-2 with 6 or 14 amino acids (a.a.) stretch (designated as s and f) matured mDC to induce IL-6, IL-12p40 and TNF-α to a similar extent, they far less activated NK cells than Pam2CSK4, a positive control of 6 a.a.-containing diacyl lipopeptide. MALP-2s and f were TLR2/6 agonists and activate the MyD88 pathway similar to Pam2CSK4, but MALP-2s having the CGNNDE sequence acted on mDC TLR2 to barely induce external NK activation. Even the s form, with slightly high induction of IL-6 compared to the f form, barely induced in vivo growth retardation of NK-sensitive implant tumor. Pam2CSK4 and MALP-2 have the common lipid moiety but different peptides, which are crucial for NK cell activation. The results infer that MALP-2 is applicable to a cytokine inducer but not to an adjuvant for antitumor NK immunotherapy." @default.
- W1965918638 created "2016-06-24" @default.
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- W1965918638 date "2011-04-01" @default.
- W1965918638 modified "2023-10-16" @default.
- W1965918638 title "Failure of mycoplasma lipoprotein MALP-2 to induce NK cell activation through dendritic cell TLR2" @default.
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- W1965918638 doi "https://doi.org/10.1016/j.micinf.2010.12.003" @default.
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