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The Journal of Immunology, 2001, 166: 15-19.
Copyright © 2001 by The American Association of Immunologists


CUTTING EDGE

Cutting Edge: Functional Interactions Between Toll-Like Receptor (TLR) 2 and TLR1 or TLR6 in Response to Phenol-Soluble Modulin1

Adeline M. Hajjar*, D. Shane O’Mahony{dagger}, Adrian Ozinsky*, David M. Underhill*, Alan Aderem*, Seymour J. Klebanoff{dagger} and Christopher B. Wilson2,*

Departments of * Immunology and {dagger} Medicine and Pathobiology, University of Washington, Seattle, WA 98195


    Abstract
 Top
 Abstract
 Introduction
 Materials and Methods
 Results and Discussion
 References
 
Toll-like receptor (TLR) 2 and TLR4 play important roles in the early, innate immune response to microbial challenge. TLR2 is preferentially involved in the inflammatory response to lipoteichoic acid, lipopeptides, and glycans from a variety of microbes, whereas TLR4 is essential for a complete response to LPSs. We report here that TLR2 transduces the response to phenol-soluble modulin, a factor secreted by Staphylococcus epidermidis. The TLR2-mediated response to this modulin was enhanced by TLR6 but inhibited by TLR1, indicating a functional interaction between these receptors. We also demonstrate that a response to phenol-soluble modulin mediated by TLR2 and TLR6 was more refractory to inhibition by TLR1 than one mediated by TLR2 alone.


    Introduction
 Top
 Abstract
 Introduction
 Materials and Methods
 Results and Discussion
 References
 
Toll-like receptors (TLRs)3 are type 1 transmembrane receptors that are involved in the early immune response to pathogens (1, 2, 3, 4). Nine mammalian TLRs, defined by sequence similarity, have been cloned (5, 6, 7, 8, 9, 10, 11). TLR2 appears to mediate responses to lipoteichoic acid, lipopeptides, and peptidoglycan from Gram-positive bacteria and mycobacteria (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22). TLR2 and TLR4 have both been reported to function as LPS receptors in vitro (23, 24, 25, 26). However, TLR4 is the predominant receptor transducing the response to LPS in vivo, because TLR4 knockout mice are hyporesponsive to LPS, whereas TLR2 knockout mice respond normally to LPS (27, 28). Furthermore, TLR4 mutations have been identified in mice that are genetically hyporesponsive to LPS (29, 30). To date, no specific ligand recognition has been attributed to TLRs other than TLR2 or TLR4, although a role for TLR5 in the response to Salmonella has been hypothesized (9). We have been studying phenol-soluble modulin (PSM), a factor secreted by Staphylococcus epidermidis and other species of staphylococci (31). Here we report that TLR2 is sufficient to confer PSM responsiveness, but that the response is enhanced by TLR6 and impeded by TLR1, indicating that TLR2 functionally interacts with the latter two proteins in the response to PSM. Furthermore, we demonstrate that a PSM response mediated by TLR2 and TLR6 is less efficiently blocked by TLR1 than one mediated by TLR2 alone.


    Materials and Methods
 Top
 Abstract
 Introduction
 Materials and Methods
 Results and Discussion
 References
 
Cells and reagents

Human embryonic kidney (HEK) 293 cells (obtained from David Schowalter, University of Washington) were maintained in DMEM with high glucose (Life Technologies, Grand Island, NY) and 10% heat-inactivated FCS (HI-FCS; HyClone, Logan, UT). The RAW 264.7 clone TT10 (22, 32) was grown in RPMI 1640 (Life Technologies) and 10% HI-FCS. Recombinant human IL-1{beta} was obtained from Endogen (Woburn, MA). PSM was purified by phenol extraction of supernatants of stationary S. epidermidis as previously described (31). All reagents were verified to be LPS free by the Limulus amebocyte lysate assay (<0.03 endotoxin U/ml; Pyrotell Associates of Cape Cod, Falmouth, MA). Escherichia coli 0111:B4 LPS (cat no. L3024) and Salmonella minnesota Re 595 LPS were obtained from Sigma (St. Louis, MO). The {alpha} hemagglutinin (HA) HA.11 mAb was obtained from Covance and the {alpha}V5 Ab was purchased from Invitrogen (San Diego, CA).

Cloning of murine TLR1

Total RAW 264.7 cell RNA was isolated using RNA exol (BioChain Institute, San Leandro, CA). Superscript II (Life Technologies) was used for reverse transcription of 1 µg of RNA using the primer 5'-GCAGCAACATCATTGAGGTGG-3'. PCR was performed with the antisense primer 5'-GGTGGATATTCTTATTGCTGTGTG-3' (stop codon underlined) and the sense primer 5'-GGCACGTTAGCACTGAGACTC-3'. The predicted 1.8-kb product was cloned using the TA cloning kit (Invitrogen), and multiple clones were sequenced to determine the consensus sequence. Two rounds of 5' rapid amplification of cDNA end (Life Technologies) were used to generate the remaining coding sequence. Both strands of at least three clones of each PCR product were sequenced to obtain a consensus sequence.

Constructs

Plasmids used in transfections were purified using the Endo-free plasmid kit (Qiagen, Chatsworth, CA). HA epitope-tagged TLR constructs were generated using a pDisplay vector (Invitrogen) that had previously been modified by deleting the myc epitope tag and the PDGFR transmembrane domain (SalI-XhoI 200-bp deletion). The modified vector provides a signal peptide and an amino-terminal HA tag. HA-TLR1, HA-TLR4, and HA-TLR6 were constructed by introducing an XmaI restriction site (by PCR) 3' of the TLR signal peptide to permit in-frame ligation into the Display vector. HA-TLR2 has been described previously (32). Chimeric TLR1-TLR6 proteins were generated by exchanging the 1-kb PstI-SacII fragment of TLR1 (aa 480–795) and TLR6 (aa 485–806; SacII was introduced 3' of the stop codon by PCR). The C-terminal V5 epitope-tagged TLR2 construct was obtained by cloning a PCR product of the full-length open reading frame into pEF6/V5-His-TOPO (Invitrogen). The Pro-to-His dominant-negative (dn) TLR constructs were generated by PCR. All constructs were verified by sequencing. The mouse CD14 expression construct has been previously described (22). Mouse MD-2 was generously provided by Kensuke Miyake (Saga Medical School, Saga, Japan) (33).

Luciferase assays

HEK 293 cells were plated at 2 x 105 cells per well in 24-well plates the day before transfection. Cells were transfected by calcium phosphate precipitation (34), washed 3 h after transfection, and stimulated 20–24 h later (as indicated) in medium containing 10% FCS. After a 5-h incubation, the cells were washed once in PBS and lysed in Passive Lysis Buffer (Promega, Madison, WI). The Dual-Luciferase reporter assay system (Promega) was used to quantitate both reporter genes in each lysate.

Intracellular TNF-{alpha} staining

The RAW-TT10 single cell assay has been previously described (22, 32). Briefly, RAW-TT10 cells were transiently transfected by electroporation with constructs expressing dnTLRs. The cells were washed 3 h posttransfection and were allowed to recover for 20 h before stimulation with 25 ng/ml PSM or 2 ng/ml S. minnesota Re 595 LPS for 4 h in the presence of 5 µg/ml brefeldin A to permit the intracellular accumulation of TNF-{alpha}. Fc receptors were blocked with 5% goat serum, and the cells were fixed in 2% paraformaldehyde and stained for TNF-{alpha} in the presence of 1% FCS and 0.1% saponin in PBS. Rat anti-mouse TNF-{alpha} Ab was obtained from PharMingen (cat. no. 18135A), and rat IgG1-PE isotype control was purchased from Caltag (cat. no. R104; South San Francisco, CA). Cells were analyzed on a FACScan using CellQuest (Becton Dickinson, Mountain View, CA).


    Results and Discussion
 Top
 Abstract
 Introduction
 Materials and Methods
 Results and Discussion
 References
 
Cloning of murine TLR1

Two mouse expressed sequence tags (ESTs) (AA177549 and AA175009) that display homology to human TLR1 were identified using TBLASTN. The first EST, which contains the translational stop site and 3' flanking sequences, was used to design an antisense oligonucleotide primer for reverse transcription of RNA from RAW 264.7 cells. A second antisense primer encompassing the stop codon was used in PCR with a sense primer designed from the sequence of the second EST, and 5' rapid amplification of the cDNA end was used to isolate the remainder of the coding sequence, which included an in-frame stop codon upstream of the initiating methionine. RT-PCR using primers spanning the entire coding region was used to confirm that a full-length open reading frame had been cloned. Mouse TLR1 shows 74% identity to human TLR1 and 65% identity to mouse TLR6 (data not shown; TLR1 GenBank accession no. AY009154).

TLR2 confers responsiveness to PSM

The recent identification of PSM as a factor that activates monocytic cells and is secreted from Staphylococci led us to investigate the role of TLRs in mediating the response to PSM (31). HEK 293 cells, which do not respond to PSM, were transiently transfected with constructs expressing murine TLR1, TLR2, TLR4, or TLR6 together with reporter constructs ELAM-1-Luc (35) to measure NF-{kappa}B activation, and {beta}-actin Renilla-Luc (36) as a transfection control (Fig. 1GoA). Full-length TLRs were expressed in each transfection (Fig. 1GoB). CD14 and MD-2 were included in the transfections shown in Fig. 1GoA because they facilitate or are required, respectively, for responses to LPS, which was tested in parallel with PSM. IL-1 was used as a positive control for activation because the parental HEK 293 cells respond to IL-1. IL-1 induced NF-{kappa}B in all transfectants tested (Fig. 1GoA). PSM induced the ELAM reporter 12-fold in cells transfected with TLR2, but <1.5-fold in cells transfected with TLR1, TLR4, or TLR6. CD14 enhanced the TLR2-mediated PSM response (Fig. 1GoC), whereas MD-2 had no effect on the TLR2-mediated PSM response (data not shown), but was required for the LPS response as was reported previously (26, 33). In contrast, LPS responsiveness was clearly detected in cells transfected with TLR4. We did not detect a TLR4-mediated response to PSM, confirming that PSM does not contain trace amounts of LPS. These results demonstrate that expression of TLR2 in HEK 293 cells is sufficient to render them PSM responsive.



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FIGURE 1. TLR2 confers PSM responsiveness. A, HEK293 cells were transiently transfected with the constructs indicated together with 0.2 µg of the NF-{kappa}B reporter (ELAM-1-firefly luciferase) and 0.006 µg of the transfection control ({beta} actin-Renilla luciferase). MD-2 (0.1 µg) and 0.1 µg CD14 were included in each transfection. The amount of each HA-TLR expression construct transfected (1.2 µg TLR1, 0.1 µg TLR2, 0.1 µg TLR4, and 0.1 µg TLR6) was adjusted such that equivalent signals were detected by Western blot when equal volumes of lysates were loaded (B). Because TLR1 is expressed much more poorly than other TLRs, we transfected 12-fold more TLR1 DNA to detect sufficient TLR1 protein on Western blot. TLR1 was not toxic to the cells because the Renilla luciferase readings were at least as high, if not higher, than those of other transfections. We also observed that TLR6 is expressed as a doublet. Because the HA tag is fused to the amino terminus of the protein, the doublet cannot arise from an alternative translational initiation site; however, it may reflect differences in posttranslational modification. The total amount of DNA transfected per well (2 µg plus the reporter constructs) was normalized by the addition of empty vector. For each transfection, the response to 10 ng/ml human IL-1{beta} (dark bars), 100 ng/ml PSM (stippled bars), or 100 ng/ml E. coli 0111: B4 LPS (hatched bars) was measured. Firefly luciferase units were divided by Renilla luciferase units to obtain relative luciferase units (RLU) shown. Similar results were obtained in three separate experiments. B, Anti-HA Western blot of the lysates shown in A. Equal volumes of each lysate were loaded on a 6% denaturing polyacrylamide gel. The positions of prestained molecule mass markers are indicated. C, HEK293 cells were transiently transfected with the indicated constructs. HA-TLR2 (0.05 µg), 0.1 µg CD14, 0.25 µg ELAM-Luc, and 0.0075 µg {beta} actin-Renilla luciferase were transfected per well. Empty vector was added to a total of 2.26 µg of DNA per well.

 
Functional interactions between TLR2 and TLR1 or TLR6 in response to PSM

To determine whether other TLR family members might contribute to the TLR2-mediated PSM response, we cotransfected HEK 293 cells with nonsaturating amounts of TLR2 and each of the other TLR clones. CD14 was also included in each transfection. Fig. 2GoA shows the NF-{kappa}B response of cotransfected cells. All of the transfectants expressed equivalent amounts of V5 epitope-tagged TLR2 as judged by Western blots (Fig. 2GoB), and each of the cotransfected HA-tagged TLR proteins was also readily detected (Fig. 2GoB). IL-1 stimulation resulted in a 4- to 5-fold induction of the reporter construct in all cotransfectants tested. Cells transfected with V5 epitope-tagged TLR2 alone showed a 6-fold induction of the ELAM reporter, which was consistently enhanced by cotransfection of HA-tagged TLR2 (1.5 ± 0.2-fold greater than TLR2-V5 alone; n = 5) and TLR6 (1.4 ± 0.2-fold; n = 12) but inhibited by TLR1 (0.5 ± 0.2-fold; n = 9). TLR4 had no effect on TLR2-V5-mediated response to PSM (Fig. 2GoA). These interactions were specific for TLR2 because neither TLR1 nor TLR6 affected the TLR4-mediated response to LPS (data not shown). Thus, TLR1 and TLR6 had opposite effects on the TLR2-mediated response to PSM.



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FIGURE 2. Functional interaction between TLR2 and TLR6 or TLR1. A, HEK293 cells were transiently transfected and stimulated as described in Fig. 1Go. TLR2-V5 (0.025 µg) and 0.1 µg CD14 were included in each well. HA-TLR2 (0.05 µg), 0.05 µg HA-TLR6, 0.6 µg HA-TLR1, 0.05 µg HA-TLR4, 0.6 µg HA-TLR1-6, and 0.1 µg HA-TLR6-1 were transfected as indicated for each well. We found that the expression patterns of the chimeric proteins reflected the levels of the amino-terminal donor. TLR1-6 was poorly expressed, like TLR1, indicating that the extracellular domain of the protein is responsible for its decreased expression with respect to TLR6. Similarly, TLR6-1 was expressed as a doublet, characteristic of TLR6. RLU represents the mean ± SD of triplicate wells. Similar results were obtained in four separate experiments. B, Western blots of the lysates shown in A. Equal volumes of each lysate were loaded on separate gels and immunoblotted with anti-V5 or anti-HA Abs. The positions of prestained molecular mass markers are indicated.

 
The extracellular domain of TLR1 is sufficient to inhibit the PSM response of TLR2

Murine TLR1 is 65% identical with murine TLR6, and the C-terminal halves of TLR1 and TLR6, consisting of one-fourth of the extracellular domain and the entire cytoplasmic domain, are nearly 90% identical. Because TLR6 enhanced the response of TLR2 to PSM, whereas TLR1 inhibited this response, we wished to determine whether the different responses to the two receptors could be attributed to their divergent extracellular domains. Therefore, we constructed chimeric receptors that fused the extracellular domain of TLR1 to the cytoplasmic domain of TLR6 (TLR1-6) or joined the extracellular domain of TLR6 to the cytoplasmic domain of TLR1 (TLR6-1). The response to PSM was inhibited in cells expressing TLR1-6 and TLR2-V5 (Fig. 2GoA). TLR1-6 and TLR1 inhibited the TLR2-mediated response to PSM to a similar extent, demonstrating that TLR1 and TLR1-6 are functionally equivalent in these assays. This indicates that the extracellular domain of TLR1, in conjunction with the cytoplasmic domain of either TLR1 or TLR6, interferes with the TLR2-mediated response to PSM. The converse chimeric receptor, TLR6-1, was expressed at similar levels to TLR6 and TLR1-6 (Fig. 2GoB) but had no effect on the TLR2-mediated PSM response (Fig. 2GoA). This suggests that both the extracellular and cytoplasmic domains of TLR6 are required to facilitate the response to PSM, although we cannot exclude the possibility that TLR6-1 could be improperly localized within the cell or could be misfolded.

dnTLR2 or dnTLR6 also inhibits the PSM response

To extend our analysis, we compared the ability of TLR1 and of dn forms of MyD88, TLR1, TLR2, TLR4, or TLR6 to inhibit the response to PSM mediated by TLR2 or by TLR2 + TLR6 (Fig. 3GoA). C3H/HeJ mice express dnTLR4 encoding a single missense mutation that converts a cytoplasmic proline residue to histidine (P712H) (29, 30). The analogous mutation was engineered in TLR2 (P681H), as was described previously (32), and in TLR1 (P678H) and TLR6 (P691H). To better evaluate the inhibition by the dn proteins, we adjusted our transfection conditions such that the PSM response was similar in cells cotransfected with TLR2 and TLR6 to cells expressing TLR2 alone (Fig. 3GoA). dnMyD88 completely blocked the PSM response in both transfectants (>90% inhibition). dnTLR2 and dnTLR6 blocked the response in TLR2-expressing cells (80% inhibition) but impeded the TLR2 + TLR6-mediated response less efficiently (65 and 50% inhibition, respectively). dnTLR1 was expressed much more poorly than the other dnTLRs (Fig. 3GoB) but, like wild-type TLR1, dnTLR1 impeded the TLR2-mediated PSM response (55% inhibition). Surprisingly, neither of the TLR1 proteins inhibited the TLR2 + TLR6-mediated PSM response (Fig. 3GoA). These results indicate that a functional complex between TLR2 and TLR6 is more resistant to inhibition by TLR1, and to a lesser extent by dnTLR6 or dnTLR2, than is a signaling complex by TLR2 alone. This suggests that the relative abundance of these TLRs within a cell is likely to play a critical role in the response to PSM.



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FIGURE 3. dnTLR2 and dnTLR6 block the PSM response. A, HEK293 cells were transiently transfected and stimulated as described in Fig. 1Go. TLR2-V5 (0.025 or 0.0125 µg) and 0.0125 µg HA-TLR6 were transfected per well as indicated. CD14 (0.1 µg), 0.2 µg ELAM-1-firefly luciferase and 0.006 µg {beta}-actin–Renilla luciferase were included in each well. HA-TLR1 (0.6 µg), 1.875 µg HA-dnTLR1, 0.15 µg HA-dnTLR2, 0.15 µg HA-dnTLR4, 0.15 µg HA-dnTLR6, and 0.15 µg dnMyD88 were transfected per well. The total amount of DNA transfected per well was kept constant by the addition of empty vector. Similar results were obtained in two separate experiments. B, Western blot of the lysates shown in A. Equal volumes of each lysate were loaded on a 6% denaturing polyacrylamide gel. Wild-type HA-TLR6 was hard to detect (compare Vect. with 0.0125 µg TLR2-V5 to Vect. with 0.0125 µg TLR2-V5 + 0.0125 µg HA-TLR6). The lanes with no HA-tagged label indicate the lysates from cells transfected with dnMyD88. C, The TT10 derivative of RAW 264.7 cells was transiently transfected with constructs encoding each dn protein indicated. Transfected cells were identified by GFP, which was expressed by virtue of an internal ribosomal entry site located downstream of each protein tested. Cell activation in response to either PSM (25 ng/ml) or LPS (2 ng/ml Re595 LPS) was measured by intracellular TNF-{alpha} staining. Each histogram represents one transfection. Dotted lines show TNF-{alpha} production in unstimulated cells. Thin lines show TNF-{alpha} production in GFP-negative (untransfected) cells, and the thick lines show TNF-{alpha} production in GFP-positive (transfected) cells in response to the indicated stimulus.

 
As a complementary approach, we next expressed dnMyD88, dnTLR2, dnTLR4, or dnTLR6 in the PSM-responsive RAW 264.7 cell clone TT10 (22, 32), which expresses TLR1, TLR2, TLR4, and TLR6 as determined by RT-PCR (data not shown). The construct encoding each dn protein also expresses green fluorescence protein (GFP), permitting transfected cells to be identified by fluorescence. Expression of GFP alone did not inhibit the response to PSM or LPS (Fig. 3GoC), whereas expression of dnMyD88 blocked both responses. The PSM response was blocked by dnTLR2 and dnTLR6, whereas greater than 80% of cells expressing dnTLR4 responded to PSM. We were unable to test dnTLR1 in this assay because this construct could not be expressed in RAW cells (data not shown). Conversely, the LPS response was completely inhibited by dnTLR4 in RAW cells, whereas dnTLR2 and dnTLR6 blocked the LPS response in <15% of cells. Thus, the TLR signaling complex that recognizes PSM in RAW cells can be inhibited by dnTLR2 and dnTLR6.

The experiments described above indicate that PSM signals through TLR2. Although the transmembrane and cytoplasmic domains of TLR6 and TLR1 are highly conserved, these TLRs enhanced or impeded, respectively, the TLR2-dependent response to PSM. These divergent effects appear to result from differences in their extracellular domains, which may reflect differences in interaction between these receptors and TLR2, in ligand binding, or in both. We have also found that dnTLR6 impedes the TLR2-mediated response to peptidoglycan, intact Gram-positive bacteria, and yeast, but not the TLR2-mediated response to lipopeptides in RAW cells, suggesting that TLR6 may interact functionally with TLR2 in response to certain ligands but not to others (37). Furthermore, our results suggest that the ratio of different TLRs within a cell may modify the response to a given ligand.


    Acknowledgments
 
We thank Kensuke Miyake for the mouse MD-2 expression construct and Beth Moorefield for helpful comments on the manuscript.


    Footnotes
 
1 This work was supported by Cystic Fibrosis Foundation Molecular Biology of Cystic Fibrosis Grants RDP R565 (to A.M.H.), Cystic Fibrosis Foundation Grant #Wilson98PO (to C.B.W.), and National Institutes of Health Grants HL65898 (to C.B.W.), AI25032 (to A.A.), and AI32972 (to A.A.). Back

2 Address correspondence and reprint requests to Dr. Christopher B. Wilson, Department of Immunology, Box 357650, University of Washington, Seattle, WA 98195. Back

3 Abbreviations used in this paper: TLR, Toll-like receptor; PSM, phenol-soluble modulin; HEK, human embryonic kidney; HA, hemagglutinin; EST, expressed sequence tag; ELAM-1, endothelial cell-leukocyte adehesion molecule; dn, dominant-negative; GFP, green fluorescence protein. Back

Received for publication September 5, 2000. Accepted for publication November 1, 2000.


    References
 Top
 Abstract
 Introduction
 Materials and Methods
 Results and Discussion
 References
 

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Toll-Like Receptor 2 (TLR2)-Dependent-Positive and TLR2-Independent-Negative Regulation of Proinflammatory Cytokines by Mycobacterial Lipomannans
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H.-K. Lee, S. Dunzendorfer, and P. S. Tobias
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GutHome page
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E. A. Kurt-Jones, M. Chan, S. Zhou, J. Wang, G. Reed, R. Bronson, M. M. Arnold, D. M. Knipe, and R. W. Finberg
Herpes simplex virus 1 interaction with Toll-like receptor 2 contributes to lethal encephalitis
PNAS, February 3, 2004; 101(5): 1315 - 1320.
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Innate ImmunityHome page
R. K. Ernst, A. M. Hajjar, J. H. Tsai, S. M. Moskowitz, C. B. Wilson, and S. I. Miller
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Innate Immunity, December 1, 2003; 9(6): 395 - 400.
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Infect. Immun.Home page
S. R. Coats, R. A. Reife, B. W. Bainbridge, T.-T. T. Pham, and R. P. Darveau
Porphyromonas gingivalis Lipopolysaccharide Antagonizes Escherichia coli Lipopolysaccharide at Toll-Like Receptor 4 in Human Endothelial Cells
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The Lip Lipoprotein from Neisseria gonorrhoeae Stimulates Cytokine Release and NF-{kappa}B Activation in Epithelial Cells in a Toll-like Receptor 2-dependent Manner
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JEMHome page
T. R. Hawn, A. Verbon, K. D. Lettinga, L. P. Zhao, S. S. Li, R. J. Laws, S. J. Skerrett, B. Beutler, L. Schroeder, A. Nachman, et al.
A Common Dominant TLR5 Stop Codon Polymorphism Abolishes Flagellin Signaling and Is Associated with Susceptibility to Legionnaires' Disease
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Cardiovasc ResHome page
D. de Kleijn and G. Pasterkamp
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Soluble Branched {beta}-(1,4)Glucans from Acetobacter Species Show Strong Activities to Induce Interleukin-12 in Vitro and Inhibit T-helper 2 Cellular Response with Immunoglobulin E Production in Vivo
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Clin. Microbiol. Rev.Home page
S. Janssens and R. Beyaert
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Clin. Microbiol. Rev., October 1, 2003; 16(4): 637 - 646.
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JCBHome page
F. Sandor, E. Latz, F. Re, L. Mandell, G. Repik, D. T. Golenbock, T. Espevik, E. A. Kurt-Jones, and R. W. Finberg
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Innate ImmunityHome page
R. I. Tapping and P. S. Tobias
Mycobacterial lipoarabinomannan mediates physical interactions between TLR1 and TLR2 to induce signaling
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J. Leukoc. Biol.Home page
K. A. Heldwein, M. D. Liang, T. K. Andresen, K. E. Thomas, A. M. Marty, N. Cuesta, S. N. Vogel, and M. J. Fenton
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J. Immunol.Home page
H. M. Paterson, T. J. Murphy, E. J. Purcell, O. Shelley, S. J. Kriynovich, E. Lien, J. A. Mannick, and J. A. Lederer
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Rheumatology (Oxford)Home page
T. Koyama, H. Tsukamoto, K. Masumoto, D. Himeji, K. Hayashi, M. Harada, and T. Horiuchi
A novel polymorphism of the human APRIL gene is associated with systemic lupus erythematosus
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Infect. Immun.Home page
A. Yoder, X. Wang, Y. Ma, M. T. Philipp, M. Heilbrun, J. H. Weis, C. J. Kirschning, R. M. Wooten, and J. J. Weis
Tripalmitoyl-S-Glyceryl-Cysteine-Dependent OspA Vaccination of Toll-Like Receptor 2-Deficient Mice Results in Effective Protection from Borrelia burgdorferi Challenge
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Associations between Toll-Like Receptors and Interleukin-4 in the Lungs of Patients with Tuberculosis
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Induction of Macrophage Nitric Oxide Production by Gram-Negative Flagellin Involves Signaling Via Heteromeric Toll-Like Receptor 5/Toll-Like Receptor 4 Complexes
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I. Sabroe, L. R. Prince, E. C. Jones, M. J. Horsburgh, S. J. Foster, S. N. Vogel, S. K. Dower, and M. K. B. Whyte
Selective Roles for Toll-Like Receptor (TLR)2 and TLR4 in the Regulation of Neutrophil Activation and Life Span
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C. F. Ortega-Cava, S. Ishihara, M. A. K. Rumi, K. Kawashima, N. Ishimura, H. Kazumori, J. Udagawa, Y. Kadowaki, and Y. Kinoshita
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J. Y. Lee, A. Plakidas, W. H. Lee, A. Heikkinen, P. Chanmugam, G. Bray, and D. H. Hwang
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J. Immunol.Home page
G. Melmed, L. S. Thomas, N. Lee, S. Y. Tesfay, K. Lukasek, K. S. Michelsen, Y. Zhou, B. Hu, M. Arditi, and M. T. Abreu
Human Intestinal Epithelial Cells Are Broadly Unresponsive to Toll-Like Receptor 2-Dependent Bacterial Ligands: Implications for Host-Microbial Interactions in the Gut
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R. Girard, T. Pedron, S. Uematsu, V. Balloy, M. Chignard, S. Akira, and R. Chaby
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K. Takeda, O. Takeuchi, and S. Akira
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E. E. Putnins, A.-R. Sanaie, Q. Wu, and J. D. Firth
Induction of Keratinocyte Growth Factor 1 Expression by Lipopolysaccharide Is Regulated by CD-14 and Toll-Like Receptors 2 and 4
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L. Williams, G. Jarai, A. Smith, and P. Finan
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N. Reiling, C. Holscher, A. Fehrenbach, S. Kroger, C. J. Kirschning, S. Goyert, and S. Ehlers
Cutting Edge: Toll-Like Receptor (TLR)2- and TLR4-Mediated Pathogen Recognition in Resistance to Airborne Infection with Mycobacterium tuberculosis
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J. Immunol.Home page
H. Weighardt, S. Kaiser-Moore, R. M. Vabulas, C. J. Kirschning, H. Wagner, and B. Holzmann
Cutting Edge: Myeloid Differentiation Factor 88 Deficiency Improves Resistance Against Sepsis Caused by Polymicrobial Infection
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T. H. Flo, L. Ryan, E. Latz, O. Takeuchi, B. G. Monks, E. Lien, O. Halaas, S. Akira, G. Skjak-Brak, D. T. Golenbock, et al.
Involvement of Toll-like Receptor (TLR) 2 and TLR4 in Cell Activation by Mannuronic Acid Polymers
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Toll-Like Receptor 4 (TLR4)-Deficient Murine Macrophage Cell Line as an In Vitro Assay System To Show TLR4-Independent Signaling of Bacteroides fragilis Lipopolysaccharide
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Int ImmunolHome page
S. E. Applequist, R. P. A. Wallin, and H.-G. Ljunggren
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N. Tsuboi, Y. Yoshikai, S. Matsuo, T. Kikuchi, K.-I. Iwami, Y. Nagai, O. Takeuchi, S. Akira, and T. Matsuguchi
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BloodHome page
E. A. Kurt-Jones, L. Mandell, C. Whitney, A. Padgett, K. Gosselin, P. E. Newburger, and R. W. Finberg
Role of Toll-like receptor 2 (TLR2) in neutrophil activation: GM-CSF enhances TLR2 expression and TLR2-mediated interleukin 8 responses in neutrophils
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O. Takeuchi, S. Sato, T. Horiuchi, K. Hoshino, K. Takeda, Z. Dong, R. L. Modlin, and S. Akira
Cutting Edge: Role of Toll-Like Receptor 1 in Mediating Immune Response to Microbial Lipoproteins
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M. Triantafilou, K. Miyake, D. T. Golenbock, and K. Triantafilou
Mediators of innate immune recognition of bacteria concentrate in lipid rafts and facilitate lipopolysaccharide-induced cell activation
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S. B. Mizel and J. A. Snipes
Gram-negative Flagellin-induced Self-tolerance Is Associated with a Block in Interleukin-1 Receptor-associated Kinase Release from Toll-like Receptor 5
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