Pathways involved in the synergistic activation of macrophages by lipoteichoic acid and hemoglobin

Lipoteichoic acid (LTA) is a Gram-positive cell surface molecule that is found in both a cell-bound form and cell-free form in the host during an infection. Hemoglobin (Hb) can synergize with LTA, a TLR2 ligand, to potently activate macrophage innate immune responses in a TLR2- and TLR4-dependent wa...

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Veröffentlicht in:PloS one 2012-10, Vol.7 (10), p.e47333-e47333
Hauptverfasser: Cox, Kathleen H, Cox, Michelle E, Woo-Rasberry, Virginia, Hasty, David L
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Hasty, David L
description Lipoteichoic acid (LTA) is a Gram-positive cell surface molecule that is found in both a cell-bound form and cell-free form in the host during an infection. Hemoglobin (Hb) can synergize with LTA, a TLR2 ligand, to potently activate macrophage innate immune responses in a TLR2- and TLR4-dependent way. At low levels of LTA, the presence of Hb can result in a 200-fold increase in the secretion of IL-6 following macrophage activation. Six hours after activation, the macrophage genes that are most highly up-regulated by LTA plus Hb activation compared to LTA alone are cytokines, chemokines, receptors and interferon-regulated genes. Several of these genes exhibit a unique TLR4-dependent increase in mRNA levels that continued to rise more than eight hours after stimulation. This prolonged increase in mRNA levels could be the result of an extended period of NF-κB nuclear localization and the concurrent absence of the NF-κB inhibitor, IκBα, after stimulation with LTA plus Hb. Dynasore inhibition experiments indicate that an endocytosis-dependent pathway is required for the TLR4-dependent up-regulation of IL-6 secretion following activation with LTA plus Hb. In addition, interferon-β mRNA is present after activation with LTA plus Hb, suggesting that the TRIF/TRAM-dependent pathway may be involved. Hb alone can elicit the TLR4-dependent secretion of TNF-α from macrophages, so it may be the TLR4 ligand. Hb also led to secretion of high mobility group box 1 protein (HMGB1), which synergized with LTA to increase secretion of IL-6. The activation of both the TLR2 and TLR4 pathways by LTA plus Hb leads to an enhanced innate immune response.
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Hemoglobin (Hb) can synergize with LTA, a TLR2 ligand, to potently activate macrophage innate immune responses in a TLR2- and TLR4-dependent way. At low levels of LTA, the presence of Hb can result in a 200-fold increase in the secretion of IL-6 following macrophage activation. Six hours after activation, the macrophage genes that are most highly up-regulated by LTA plus Hb activation compared to LTA alone are cytokines, chemokines, receptors and interferon-regulated genes. Several of these genes exhibit a unique TLR4-dependent increase in mRNA levels that continued to rise more than eight hours after stimulation. This prolonged increase in mRNA levels could be the result of an extended period of NF-κB nuclear localization and the concurrent absence of the NF-κB inhibitor, IκBα, after stimulation with LTA plus Hb. Dynasore inhibition experiments indicate that an endocytosis-dependent pathway is required for the TLR4-dependent up-regulation of IL-6 secretion following activation with LTA plus Hb. In addition, interferon-β mRNA is present after activation with LTA plus Hb, suggesting that the TRIF/TRAM-dependent pathway may be involved. Hb alone can elicit the TLR4-dependent secretion of TNF-α from macrophages, so it may be the TLR4 ligand. Hb also led to secretion of high mobility group box 1 protein (HMGB1), which synergized with LTA to increase secretion of IL-6. 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Hemoglobin (Hb) can synergize with LTA, a TLR2 ligand, to potently activate macrophage innate immune responses in a TLR2- and TLR4-dependent way. At low levels of LTA, the presence of Hb can result in a 200-fold increase in the secretion of IL-6 following macrophage activation. Six hours after activation, the macrophage genes that are most highly up-regulated by LTA plus Hb activation compared to LTA alone are cytokines, chemokines, receptors and interferon-regulated genes. Several of these genes exhibit a unique TLR4-dependent increase in mRNA levels that continued to rise more than eight hours after stimulation. This prolonged increase in mRNA levels could be the result of an extended period of NF-κB nuclear localization and the concurrent absence of the NF-κB inhibitor, IκBα, after stimulation with LTA plus Hb. 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immunology</subject><subject>Stimulation</subject><subject>Synergism</subject><subject>Teichoic Acids - metabolism</subject><subject>TLR2 protein</subject><subject>TLR4 protein</subject><subject>Toll-Like Receptor 2 - metabolism</subject><subject>Toll-Like Receptor 4 - metabolism</subject><subject>Toll-like receptors</subject><subject>Transcription activation</subject><subject>Tumor necrosis factor-TNF</subject><subject>Tumor necrosis factor-α</subject><issn>1932-6203</issn><issn>1932-6203</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>BENPR</sourceid><sourceid>DOA</sourceid><recordid>eNqNk12L1DAUhoso7rr6D0QLgujFjPlq2twIy-LHwMKKX7fhNEnbLJlmbNLR-fdmdrrLVPZCcpGQPOdN3pNzsuw5RktMS_zu2o9DD2658b1ZIsRKSumD7BQLShacIPrwaH2SPQnhGqGCVpw_zk4IRSUuBTrN6i8Qu9-wC7ntt95tjU6LPHYmD7veDK0N0aocVLRbiNb3uW_yNajBbzpoTcjrXe7sxkdjVedvSKtz6HXembVvna9t_zR71IAL5tk0n2U_Pn74fvF5cXn1aXVxfrlQXJC4SA-qFWeM6bICrVBZaI5qogCXnInkmGrBGs5phTBnuK6TZU40M7xgSBeanmUvD7ob54Oc0hMkpoQXhSAIJWJ1ILSHa7kZ7BqGnfRg5c2GH1oJQ_LrjNSqaQToxlCDmWBIQFkDooZSQUQ6TFrvp9vGem20Mn0cwM1E5ye97WTrt5IyXhW8SgJvJoHB_xpNiHJtgzLOQW_8mN6NMeEVqXiZ0Ff_oPe7m6gWkgHbNz7dq_ai8rxglBIhKE_U8h4qDW3WVqVaamzanwW8nQUkJpo_sYUxBLn69vX_2aufc_b1EdsZcLEL3o37KgtzkB3AVHUhDKa5SzJGct8Kt9mQ-1aQUyuksBfHH3QXdFv79C8KewQG</recordid><startdate>20121010</startdate><enddate>20121010</enddate><creator>Cox, Kathleen H</creator><creator>Cox, Michelle E</creator><creator>Woo-Rasberry, Virginia</creator><creator>Hasty, David L</creator><general>Public Library of Science</general><general>Public Library of Science (PLoS)</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>IOV</scope><scope>ISR</scope><scope>3V.</scope><scope>7QG</scope><scope>7QL</scope><scope>7QO</scope><scope>7RV</scope><scope>7SN</scope><scope>7SS</scope><scope>7T5</scope><scope>7TG</scope><scope>7TM</scope><scope>7U9</scope><scope>7X2</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8AO</scope><scope>8C1</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>C1K</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>FR3</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>H94</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>KB.</scope><scope>KB0</scope><scope>KL.</scope><scope>L6V</scope><scope>LK8</scope><scope>M0K</scope><scope>M0S</scope><scope>M1P</scope><scope>M7N</scope><scope>M7P</scope><scope>M7S</scope><scope>NAPCQ</scope><scope>P5Z</scope><scope>P62</scope><scope>P64</scope><scope>PATMY</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>PYCSY</scope><scope>RC3</scope><scope>7X8</scope><scope>5PM</scope><scope>DOA</scope></search><sort><creationdate>20121010</creationdate><title>Pathways involved in the synergistic activation of macrophages by lipoteichoic acid and hemoglobin</title><author>Cox, Kathleen H ; Cox, Michelle E ; Woo-Rasberry, Virginia ; Hasty, David L</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c692t-717bc6444d78adc075d60b2ca176493713d94f663801641bb04762d4e6540d5d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Acids</topic><topic>Animals</topic><topic>Bacteria</topic><topic>Binding sites</topic><topic>Biological response modifiers</topic><topic>Biology</topic><topic>Blotting, Western</topic><topic>Bone marrow</topic><topic>Cell activation</topic><topic>Cell Line</topic><topic>Cell surface</topic><topic>Chemokines</topic><topic>Comparative analysis</topic><topic>Cytokines</topic><topic>Endocytosis</topic><topic>Experiments</topic><topic>Fatty acids</topic><topic>Free form</topic><topic>Gene Expression Regulation - immunology</topic><topic>Genes</topic><topic>Health aspects</topic><topic>Hemoglobin</topic><topic>Hemoglobins</topic><topic>Hemoglobins - metabolism</topic><topic>High mobility group proteins</topic><topic>HMGB1 protein</topic><topic>HMGB1 Protein - metabolism</topic><topic>Humans</topic><topic>Immune response</topic><topic>Immune system</topic><topic>Immunity, Innate - immunology</topic><topic>Innate immunity</topic><topic>Interferon</topic><topic>Interleukin 6</topic><topic>Interleukin-6 - immunology</topic><topic>Laboratory animals</topic><topic>Lipopolysaccharides - metabolism</topic><topic>Lipoteichoic acid</topic><topic>Localization</topic><topic>Macrophage Activation - immunology</topic><topic>Macrophages</topic><topic>Mice</topic><topic>Microarray Analysis</topic><topic>mRNA</topic><topic>Neurobiology</topic><topic>Neurosciences</topic><topic>NF-κB protein</topic><topic>Pathways</topic><topic>Phosphorylation</topic><topic>Proteins</topic><topic>Real-Time Polymerase Chain Reaction</topic><topic>Receptors</topic><topic>Reverse Transcriptase Polymerase Chain Reaction</topic><topic>RNA</topic><topic>Signal transduction</topic><topic>Signal Transduction - 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Hemoglobin (Hb) can synergize with LTA, a TLR2 ligand, to potently activate macrophage innate immune responses in a TLR2- and TLR4-dependent way. At low levels of LTA, the presence of Hb can result in a 200-fold increase in the secretion of IL-6 following macrophage activation. Six hours after activation, the macrophage genes that are most highly up-regulated by LTA plus Hb activation compared to LTA alone are cytokines, chemokines, receptors and interferon-regulated genes. Several of these genes exhibit a unique TLR4-dependent increase in mRNA levels that continued to rise more than eight hours after stimulation. This prolonged increase in mRNA levels could be the result of an extended period of NF-κB nuclear localization and the concurrent absence of the NF-κB inhibitor, IκBα, after stimulation with LTA plus Hb. Dynasore inhibition experiments indicate that an endocytosis-dependent pathway is required for the TLR4-dependent up-regulation of IL-6 secretion following activation with LTA plus Hb. In addition, interferon-β mRNA is present after activation with LTA plus Hb, suggesting that the TRIF/TRAM-dependent pathway may be involved. Hb alone can elicit the TLR4-dependent secretion of TNF-α from macrophages, so it may be the TLR4 ligand. Hb also led to secretion of high mobility group box 1 protein (HMGB1), which synergized with LTA to increase secretion of IL-6. The activation of both the TLR2 and TLR4 pathways by LTA plus Hb leads to an enhanced innate immune response.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>23071790</pmid><doi>10.1371/journal.pone.0047333</doi><tpages>e47333</tpages><oa>free_for_read</oa></addata></record>
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subjects Acids
Animals
Bacteria
Binding sites
Biological response modifiers
Biology
Blotting, Western
Bone marrow
Cell activation
Cell Line
Cell surface
Chemokines
Comparative analysis
Cytokines
Endocytosis
Experiments
Fatty acids
Free form
Gene Expression Regulation - immunology
Genes
Health aspects
Hemoglobin
Hemoglobins
Hemoglobins - metabolism
High mobility group proteins
HMGB1 protein
HMGB1 Protein - metabolism
Humans
Immune response
Immune system
Immunity, Innate - immunology
Innate immunity
Interferon
Interleukin 6
Interleukin-6 - immunology
Laboratory animals
Lipopolysaccharides - metabolism
Lipoteichoic acid
Localization
Macrophage Activation - immunology
Macrophages
Mice
Microarray Analysis
mRNA
Neurobiology
Neurosciences
NF-κB protein
Pathways
Phosphorylation
Proteins
Real-Time Polymerase Chain Reaction
Receptors
Reverse Transcriptase Polymerase Chain Reaction
RNA
Signal transduction
Signal Transduction - immunology
Stimulation
Synergism
Teichoic Acids - metabolism
TLR2 protein
TLR4 protein
Toll-Like Receptor 2 - metabolism
Toll-Like Receptor 4 - metabolism
Toll-like receptors
Transcription activation
Tumor necrosis factor-TNF
Tumor necrosis factor-α
title Pathways involved in the synergistic activation of macrophages by lipoteichoic acid and hemoglobin
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