Abstract
Synthetic lipopeptides derived from bacterial lipoprotein are efficient immunoadjuvants. In vitro they activate antigen presenting cells (APCs) to induce the translocation of nuclear factor kappa B (NF-kappaB) and the activation of further transcription factors. This results in the expression of genes encoding cytokines such as IL-1, IL-6, TNF-alpha and in the release of reactive oxygen/nitrogen intermediates. The molecular structure of microbial products determines TLR specificity and thus their activatory potential and immunoadjuvanticity. In the present study, we investigated the lipopeptide-induced activation of leukocytes at different cellular levels by applying derivatives of a synthetic lipopentapeptide-fatty acid library. Our results show that TLR2 plays a key role for the activation of bone marrow-derived macrophages (BMDMs) by lipopentapeptide derivatives and that the fatty acid composition of the lipopeptides determines their activation potential and TLR specificity.
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
MeSH terms
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Adjuvants, Immunologic / chemistry
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Adjuvants, Immunologic / pharmacology*
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Animals
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Bacterial Proteins / chemistry
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Cell Line
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Extracellular Signal-Regulated MAP Kinases / metabolism
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Fatty Acids, Unsaturated / chemistry*
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Humans
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In Vitro Techniques
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Lipoproteins / chemistry*
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Macrophage Activation / genetics
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Macrophage Activation / physiology*
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Macrophages / metabolism*
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Membrane Glycoproteins / genetics
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Membrane Glycoproteins / physiology
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Mice
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Mice, Inbred C57BL
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NF-kappa B / metabolism
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Nitric Oxide / metabolism
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Peptide Library
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Peptides / chemistry
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Peptides / pharmacology*
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Phosphorylation
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Receptors, Cell Surface / genetics
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Receptors, Cell Surface / physiology*
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Toll-Like Receptor 2
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Toll-Like Receptors
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Transfection
Substances
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Adjuvants, Immunologic
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Bacterial Proteins
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Fatty Acids, Unsaturated
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Lipoproteins
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Membrane Glycoproteins
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NF-kappa B
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Peptide Library
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Peptides
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Receptors, Cell Surface
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TLR2 protein, human
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Tlr2 protein, mouse
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Toll-Like Receptor 2
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Toll-Like Receptors
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Nitric Oxide
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Extracellular Signal-Regulated MAP Kinases