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The Peptide Sequence of Diacyl Lipopeptides Determines Dendritic Cell TLR2-Mediated NK Activation
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Title: | The Peptide Sequence of Diacyl Lipopeptides Determines Dendritic Cell TLR2-Mediated NK Activation |
Authors: | Azuma, Masahiro Browse this author | Sawahata, Ryoko Browse this author | Akao, Yuusuke Browse this author | Ebihara, Takashi Browse this author | Yamazaki, Sayuri Browse this author | Matsumoto, Misako Browse this author →KAKEN DB | Hashimoto, Masahito Browse this author | Fukase, Koichi Browse this author | Fujimoto, Yukari Browse this author | Seya, Tsukasa Browse this author |
Issue Date: | 2-Sep-2010 |
Publisher: | Public Library of Science |
Journal Title: | PLoS ONE |
Volume: | 5 |
Issue: | 9 |
Start Page: | e12550 |
Publisher DOI: | 10.1371/journal.pone.0012550 |
Abstract: | Natural killer (NK) cells are lymphocyte effectors that are activated to control certain microbial infections and tumors. Many NK-activating and regulating receptors are involved in regulating NK cell function. In addition, activation of naïve NK cells is fundamentally triggered by cytokines or myeloid dendritic cells (mDC) in various modes. In this study, we synthesized 16 S[2,3-bis(palmitoyl)propyl] cysteine (Pam2Cys) lipopeptides with sequences designed from lipoproteins of Staphylococcus aureus, and assessed their functional properties using mouse (C57BL/6) bone marrow-derived DC (BMDC) and NK cells. NK cell activation was evaluated by three criteria: IFN-γ production, up-regulation of NK activation markers and cytokines, and NK target (B16D8 cell) cytotoxicity. The diacylated lipopeptides acted as TLR2 ligands, inducing up-regulation of CD25/CD69/CD86, IL-6, and IL-12p40, which represent maturation of BMDC. Strikingly, the Pam2Cys lipopeptides induced mouse NK cell activation based on these criteria. Cell-cell contact by Pam2Cys peptide-stimulated BMDC and NK cells rather than soluble mediators released by stimulated BMDC induced activation of NK cells. For most lipopeptides, the BMDC TLR2/MyD88 pathway was responsible for driving NK activation, while some slightly induced direct activation of NK cells via the TLR2/MyD88 pathway in NK cells. The potential for NK activation was critically regulated by the peptide primary sequence. Hydrophobic or proline-containing sequences proximal to the N-terminal lipid moiety interfered with the ability of lipopeptides to induce BMDC-mediated NK activation. This mode of NK activation is distinctly different from that induced by polyl:C, which is closely associated with type I IFN-inducing pathways of BMDC. These results imply that the MyD88 pathway of BMDC governs an alternative NK-activating pathway in which the peptide sequence of TLR2-agonistic lipopeptides critically affects the potential for NK activation. |
Rights: | http://creativecommons.org/licenses/by/2.5/ |
Type: | article |
URI: | http://hdl.handle.net/2115/43901 |
Appears in Collections: | 医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 瀬谷 司
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