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PubMed1994

Site directed mutagenesis of the complement C5a receptor--examination of a model for its interaction with the ligand C5a.

C5a is a 74 amino acid peptide cleaved from the fifth component of the complement system after activation of either the alternative or classical pathways. It is a potent chemoattractant for neutrophils and monocytes binding to identical receptors on the cell surface. Following the cloning of the cDNA encoding for the human complement C5a receptor, revealing it to be a member of the rhodopsin superfamily of G-protein coupled receptors, a model for the interaction of the C5a receptor with its ligand was proposed, the structure for the receptor being modelled on that of the well defined receptor bacteriorhodopsin. In this model two key residues of the receptor, aspartate82 and either glutamate179 or glutamate 180 were proposed to make up part of the binding site for C5a, acting as counter ions for arginine74 and arginine40, respectively of the C5a molecule. Replacement of aspartate82, glutamate179 and glutamate180 of the C5a receptor with asparagine and glutamine, respectively was shown to have little effect on the dissociation constant of the receptor as detected by Scatchard analysis and competitive binding assays. Hence this modus operandi for the interaction of C5a with its receptor can be rejected.

Animals↗

PubMed2000

A recurrent general RNA binding domain appended to plant methionyl-tRNA synthetase acts as a cis-acting cofactor for aminoacylation.

The cDNA encoding rice methionyl-tRNA synthetase was isolated. The protein exhibited a C-terminal polypeptide appended to a classical MetRS domain. This supplementary domain is related to endothelial monocyte activating polypeptide II (EMAPII), a cytokine produced in mammals after cleavage of p43, a component of the multisynthetase complex. It is also related to Arc1p and Trbp111, two tRNA binding proteins. We expressed rice MetRS and a derivative with a deletion of its EMAPII-like domain. Band-shift analysis showed that this extra-domain provides MetRS with non-specific tRNA binding properties. The EMAPII-like domain contributed a 10-fold decrease in K:(M) for tRNA in the aminoacylation reaction catalyzed by the native enzyme, as compared with the C-terminally truncated MetRS. Consequently, the EMAPII domain provides MetRS with a better catalytic efficiency at the free tRNA concentration prevailing in vivo. This domain binds the acceptor minihelix of tRNA(Met) and facilitates its aminoacylation. These results suggest that the EMAPII module could be a relic of an ancient tRNA binding domain that was incorporated into primordial synthetases for aminoacylation of RNA minihelices taken as the ancestor of modern tRNA.

Acylation↗

PubMed2000

Review: Biology and relevance of C-reactive protein in cardiovascular and renal disease.

C-reactive protein (CRP) is a member of the pentraxin family of proteins, which are characterised by a cyclic pentameric structure and radial symmetry. The five identical 24-kDa protomers consist of 206 amino acids, and are noncovalently linked. CRP binds to a range of substances such as phosphocholine, fibronectin, chromatin, histones, and ribonucleoprotein in a calcium-dependent manner. It is a ligand for specific receptors on phagocytic leukocytes, mediates activation reactions on monocytes and macrophages, and activates complement. Plasma CRP is the classical acute-phase protein, increasing 1,000-fold in response to infection, ischemia, trauma, burns, and inflammatory conditions. A growing number of studies suggest that CRP is an independent risk factor for atherosclerotic vascular disease. Plasma CRP concentrations in the highest quartile are associated, depending on the subject group, with 1.5- to 7-fold increases in relative risk. In the high-risk endstage renal failure population, a raised CRP is associated with up to 5.5-fold increased relative risk of CVD and 4.6-fold increased relative risk of death. This review examines the relationships between CRP, cardiovascular disease, and mortality, with special reference to renal disease.

C-Reactive Protein↗

PubMed1982

[Auer bodies and Ph1 chromosome: chronic myeloid pseudoleukemia?].

In 4 cases, the probable diagnosis was that of a chronic myeloid leukaemia (CML) in a blast crisis, because of the sudden acute onset and the presence of the Ph 1 chromosome. In each case, however, there were Auer bodies in the blasts, an unusual finding in CML. Cytological and cytochemical examination led respectively to the diagnosis of an M2 acute myeloblastic leukaemia (AML), according to the FAB classification, to that of a pre-leukaemia progressing to an M2 AML, to that of a M3 promyelocyte leukaemia, with numerous monocytes and finally, in one case, the diagnosis lay between a possible acute crisis of CML with Auer bodies or an acute myelo-monocyte leukaemia. These atypical findings did not conform to the classic picture of CML and cannot be classified as such in spite of the presence of the Ph 1 chromosome. To consider them as true CML would be to run a risk of distorting the haematological evolutive and therapeutic aspects of this disease.

Adult↗

PubMed1982

Two-dimensional electrophoretic analysis of human leukocyte proteins from patients with rheumatoid arthritis.

Human leukocyte proteins from more than 150 patients with rheumatoid arthritis, together with age- and sex-matched controls, were analyzed by use of the ISO-DALT technique in two-dimensional polyacrylamide gel electrophoresis. Patients with ankylosing spondylitis, polymyalgia rheumatica, psoriatic arthritis, calcium tendinitis, post-infectious arthritis, and asymmetrical seronegative arthritis were also included as positive controls. Synthesis of several proteins, referred to by number as members of the "Rheuma" set, is shown to increase in the leukocyte preparations from patients with classical rheumatoid arthritis. Several of these proteins are specific to monocytes or granulocytes; others are of unknown cellular origin, but appear to be unique to rheumatoid arthritis. The Rheuma proteins appear to be indicators of disease activity, because their increased synthesis can be correlated with sedimentation rate and other clinical indices of rheumatoid disease activity.

Adult↗

PubMed1976

Interaction of C-reactive protein with lymphocytes and monocytes: complement-dependent adherence and phagocytosis.

The serum constituent C-reactive protein (CRP), which activates the classical complement (C) pathway when reacting with its substrates, was examined for its ability to mediate reactions of opsonic adherence and phagocytosis. Erythrocytes coated with C-polysaccharide (CPS) and reacted with CRP (E. CPS-CRP) failed to adhere to B cells and displayed only minimal adherence to monocytes. However, upon the addition of absorbed C or purified C components these cells were found to possess the cleavage products C4b and C3b, which in turn resulted in attachment of these cells to both human B lymphocytes and peripheral blood monocytes. E. CPS-CRP treated with C in the absence of antibody were readily phagocytosized by glass-adherent human monocytes. The phagocytosis of E. CPS-CRP-C was not only mediated by CRP but also required the presence of CRP on the surface of the red cells. The extent of ingestion was proportional to the amount of CRP on the red cell intermediate and was reduced by blocking monocyte receptors with aggregated human gamma-globulin (HGG) at concentrations which did not impair the uptake of other particles. The mediation by CRP of reactions of opsonic adherence and phagocytosis as outlined in these studies points to a significant role for CRP in reactions of host defense and inflammation.

C-Reactive Protein↗

PubMed1985

Complement-subcomponent-C1-inhibitor synthesis by human monocytes.

By using a radioimmunoassay, C1-inhibitor was found to accumulate in the supernatants of human monocyte cultures. The production of this protein was inhibited reversibly by cycloheximide. When C1-inhibitor synthesis was compared with C2 synthesis, it was found that C1-inhibitor synthesis continued, whereas synthesis of C2 appeared to cease after about 7 days in culture. Immunoprecipitation of supernatants of monocyte cultures that had been pulsed with [35S]methionine showed a specific band with an Mr of 105 000. Immunoprecipitates of the lysates revealed a band of Mr 83 000; this was thought to represent a partially or non-glycosylated precursor of C1-inhibitor. C1-inhibitor produced by the monocytes was shown, by using a haemolytic assay, to be functionally active. However, the functional activity of C1-inhibitor was reduced by only 44% in the presence of cycloheximide, whereas the concentration of this protein in cycloheximide-treated culture supernatants fell by more than 93%. This finding suggests that monocytes secrete a second molecule, which inhibits C1 activity but is distinct from classical C1-inhibitor.

Cells, Cultured↗

PubMed2001

Regulation and possible function of beta-catenin in human monocytes.

In this study, we demonstrate that adherence factors, serum constituents, LPS, and zymosan are capable of inducing a cellular accumulation of beta-catenin in human monocytes. Whereas adherence-dependent accumulation of beta-catenin can be blocked by wortmannin, an inhibitor of phosphatidylinositol 3-kinase, accumulation induced by the remaining stimuli cannot be prevented by inhibition of phosphatidylinositol 3-kinase, implying the involvement of beta-catenin in other not yet described signal transduction pathways. A role of beta-catenin in adherence-dependent processes by interacting with classical cadherins can be excluded as we could not detect cadherins in monocytes. To test whether it is possible that beta-catenin interacts with LEF/TCF (lymphoid enhancer factor/T cell factor) transcription factors, we studied the expression of this protein family. TCF-4 was identified as the LEF/TCF transcription factor present in human monocytes. However, neither cellular induction of beta-catenin nor cotransfection experiments with beta-catenin conducted in the monocytic cell line THP-1 resulted in the activation of a LEF/TCF-dependent promoter, suggesting the requirement of additional signals. Concurrent with this suggestion, we found that LPS and zymosan, two physiological inducers of beta-catenin, caused an increase in the expression of genes that are positively regulated by beta-catenin.

Androstadienes↗

PubMed2004

Monocyte-derived HLA-G acts as a strong inhibitor of autologous CD4 T cell activation and is upregulated by interferon-beta in vitro and in vivo: rationale for the therapy of multiple sclerosis.

Peripheral antigen presenting cells (APCs) contribute to the maintenance of immune tolerance and are considered to play a critical role in promoting the (re)activation of autoreactive T cells in multiple sclerosis (MS). Interferon-beta (IFN-beta) is the principle immune-modulatory agent used in the treatment of MS, but its mechanism of action remains elusive. HLA-G is a non-classical MHC molecule (MHC class Ib) attributed chiefly immune-regulatory functions. We here investigated the role of monocyte-derived HLA-G in the immune-regulatory processes of MS and its implications for current immune-modulatory therapies. Monocytes constitutively express cell surface HLA-G1 and soluble HLA-G5. Comparison of monocytic HLA-G expression between patients with relapsing-remitting MS (n=17) and healthy donors (n=20) revealed significantly lower levels of HLA-G1 protein in MS patients. However, both groups showed a significant upregulation of HLA-G in response to IFN-beta in vitro. Serial measurements of HLA-G mRNA levels in MS patients before and during IFN-beta therapy corroborated the relevance of these results in vivo: 1 month after initiation of IFN-beta1b therapy (n=9), HLA-G1 and HLA-G5 were significantly increased compared to baseline levels and remained elevated during treatment for 6 months (n=3). Importantly, functional experiments demonstrated that monocyte-derived HLA-G inhibits both Th1 (IFN-gamma, IL-2) and Th2 (IL-10) cytokine production by antigen-stimulated autologous CD4 T cells. Soluble HLA-G added to antigen-specific T cell lines (TCLs) has similar effects on the release of cytokines and reduces T cell proliferation. Although both IFN-beta and IFN-gamma strongly enhance HLA-G1 and HLA-G5 expression by monocytes in vitro, IFN-beta leads to a stronger relative upregulation of HLA-G compared to classical MHC class I molecules than stimulation with IFN-gamma. Taken together, monocyte-derived HLA-G mediates the inhibition of autologous CD4 T cell activation and might be involved in immune-regulatory pathways in the pathogenesis of MS. We conclude that some desirable immune-modulatory effects of INF-beta might be accomplished via the upregulation of the immune-tolerogenic molecule HLA-G.

Adult↗

PubMed2005

Lipopolysaccharide-induced heme oxygenase-1 expression in human monocytic cells is mediated via Nrf2 and protein kinase C.

Monocytes play a key role in mobilization of the immune response during sepsis. In response to LPS, monocytes produce both proinflammatory mediators and regulatory proteins that counteract the inflammation and oxidative stress. In murine macrophages, LPS stimulates expression of heme oxygenase 1 (HO-1), a cytoprotective enzyme that catalyzes the degradation of heme. The HO-1 5'-untranslated region, similarly to other cytoprotective genes, contains antioxidant-response elements (AREs) that can bind the transcription factor NF-E2-related factor 2 (Nrf2). At present, the role of Nrf2 in LPS-induced HO-1 expression in monocytic cells has not been investigated. In this study, LPS induced HO-1 mRNA and protein expression in human monocytes and THP-1 cells. Nrf2 translocated from the cytosol to the nucleus in response to LPS and bound to the ARE site in the human HO-1 promoter. In addition, a dominant negative Nrf2 mutant inhibited LPS-induced HO-1 mRNA expression but not TNF-alpha mRNA expression in THP-1 cells. Ro-31-8220, a pan-protein kinase C (PKC) inhibitor, and Go6976, a classical PKC inhibitor, blunted LPS-induced HO-1 mRNA expression in monocytes and THP-1 cells. Both PKC inhibitors also blocked LPS-induced Nrf2 binding to the ARE. These results indicate that LPS-induced HO-1 expression in human monocytic cells requires Nrf2 and PKC.

Active Transport, Cell Nucleus↗

PubMed2004

Human cytomegalovirus inhibits cytokine-induced macrophage differentiation.

Human cytomegalovirus (HCMV) infection in immunocompromised patients is associated with impaired immunological function. Blood monocytes, which differentiate into macrophage effector cells, are of central importance for immune reactivity. Here, we demonstrate that HCMV transiently blocks cytokine-induced differentiation of monocytes into functionally active phagocytic macrophages. In HCMV-treated cultures, the cells had classical macrophage markers but lacked the classical morphological appearance of macrophages and had impairments in migration and phagocytosis. Even at very low multiplicities of infection, macrophage differentiation was almost completely inhibited. The inhibition appeared to be mediated by a soluble factor released upon viral treatment of monocytes. Human immunodeficiency virus or measles virus had no such effects. These findings suggest that HCMV impairs immune function by blocking certain aspects of cytokine-induced differentiation of monocytes and demonstrate an efficient pathway for this virus to evade immune recognition that may have clinical implications for the generalized immunosuppression often observed in HCMV-infected patients.

Biomarkers↗

PubMed2005

Human 60-kDa heat shock protein is a target autoantigen of T cells derived from atherosclerotic plaques.

Epidemiological studies suggest the potential importance of an inflammatory component in atherosclerosis and support the hypothesis that immune responses to Ags of pathogens cross-react with homologous host proteins due to molecular mimicry. Protein candidates involved may be the stress-induced proteins known as heat shock proteins (HSP). In this study, we report that atherosclerotic plaques harbor in vivo-activated CD4(+) T cells that recognize the human 60-kDa HSP. Such in vivo-activated 60-kDa HSP-specific T cells are not detectable in the peripheral blood. In patients with positive serology and PCR for Chlamydia pneumoniae DNA, but not in patients negative for both, most of plaque-derived T cells specific for human 60-kDa HSP also recognized the C. pneumoniae 60-kDa HSP. We characterized the submolecular specificity of such 60-kDa HSP-specific plaque-derived T cells and identified both the self- and cross-reactive epitopes of that autoantigen. On challenge with human 60-kDa HSP, most of the plaque-derived T cells expressed Th type 1 functions, including cytotoxicity and help for monocyte tissue factor production. We suggest that arterial endothelial cells, undergoing classical atherosclerosis risk factors and conditioned by Th type 1 cytokines, express self 60-kDa HSP, which becomes target for both autoreactive T cells and cross-reactive T cells to microbial 60-kDa HSP via a mechanism of molecular mimicry. This hypothesis is in agreement with the notion that immunization with HSP exacerbates atherosclerosis, whereas immunosuppression and T cell depletion prevent the formation of arteriosclerotic lesions in experimental animals.

Aged↗

PubMed2000

Modulation of HLA-G antigens expression by human cytomegalovirus: specific induction in activated macrophages harboring human cytomegalovirus infection.

After infection, human CMV (HCMV) establishes a latent and persistent infection in immature myeloid progenitors and peripheral blood monocytes. Completion of the HCMV life cycle is possible upon maturation of monocytes to tissue macrophages and under permissive circumstances, e.g., immunosuppression. We investigated the hypothesis that HLA-G molecules could be induced during HCMV reactivation in activated macrophages to favor virus dissemination. In this study, we provide evidence that HLA-G Ags are produced during viral reactivation in macrophages generated after allogeneic stimulation of HCMV latently infected monocytes. While HLA-G surface expression is up-regulated, classical MHC-I molecules are partially down-regulated by HCMV. In vivo, bronchoalveolar macrophages collected from patients suffering from acute HCMV pneumonitis also express HLA-G molecules. The direct correlation between HLA-G Ag induction and HCMV infection was confirmed in U-373 MG astrocytoma cells. Soluble HLA-G expression is stimulated upon HCMV infection, and this modulation depends on the cooperative action of the two immediate-early-1 pp72 and immediate-early-2 pp86 products. Because HLA-G transcription is active in macrophages and U-373 MG astrocytoma cells, it is likely that the modulation of HLA-G protein expression during HCMV replication occurs at a post-transcriptional level. Our data suggest that induction of HLA-G molecules could be an additional mechanism that helps HCMV to subvert host defenses.

Astrocytoma↗

PubMed1992

Legionella pneumophila lipopolysaccharide activates the classical complement pathway.

Legionella pneumophila is a gram-negative bacterium capable of entering and growing in alveolar macrophages and monocytes. Complement and complement receptors are important in the uptake of L. pneumophila by human mononuclear phagocytes. The surface molecules of L. pneumophila that activate the complement system are unknown. To identify these factors, we investigated the effects of L. pneumophila lipopolysaccharide (LPS) on the classical and alternative complement pathways of normal human serum by functional hemolytic assays. Although incubation of LPS in normal human serum at 37 degrees C resulted in the activation of both pathways, complement activation proceeded primarily through the classical pathway. Activation of the classical pathway by LPS was dependent on natural antibodies of the immunoglobulin M class that were present in various quantities in sera from different normal individuals but were absent in an immunoglobulin-deficient serum obtained from an agammaglobulinemic patient. Additional studies using sheep erythrocytes coated with LPS suggested that the antibodies recognized antigenic sites in the carbohydrate portion of LPS. The ability of LPS to interact with the complement system suggests a role for LPS in the uptake of L. pneumophila by mononuclear phagocytes.

Complement C1↗

PubMed2003

Classical swine fever virus interferes with cellular antiviral defense: evidence for a novel function of N(pro).

Classical swine fever virus (CSFV) replicates efficiently in cell lines and monocytic cells, including macrophages (MPhi), without causing a cytopathic effect or inducing interferon (IFN) secretion. In the present study, the capacity of CSFV to interfere with cellular antiviral activity was investigated. When the porcine kidney cell line SK-6 was infected with CSFV, there was a 100-fold increased capacity to resist to apoptosis induced by polyinosinic-polycytidylic acid [poly(IC)], a synthetic double-stranded RNA. In MPhi, the virus infection inhibited poly(IC)-induced alpha/beta IFN (type I IFN) synthesis. This interference with cellular antiviral defense correlated with the presence of the viral N(pro) gene. Mutants lacking the N(pro) gene (DeltaN(pro) CSFV) did not protect SK-6 cells from poly(IC)-induced apoptosis, despite growth properties and protein expression levels similar to those of the wild-type virus. Furthermore, DeltaN(pro) CSFV did not prevent poly(IC)-induced type I IFN production in MPhi but rather induced type I IFN in the absence of poly(IC) in both MPhi and the porcine kidney cell line PK-15, but not in SK-6 cells. With MPhi and PK-15, an impaired replication of the DeltaN(pro) CSFV compared with wild-type virus was noted. In addition, DeltaN(pro) CSFV, but not wild-type CSFV, could interfere with vesicular stomatitis virus replication in PK-15 cells. Taken together, these results provide evidence for a novel function associated with CSFV N(pro) with respect to the inhibition of the cellular innate immune system.

Animals↗

PubMed2006

Alveolar epithelial cells direct monocyte transepithelial migration upon influenza virus infection: impact of chemokines and adhesion molecules.

Influenza A virus pneumonia is characterized by severe lung injury and high mortality. Early infection elicits a strong recruitment of monocytes from the peripheral blood across the endo-/epithelial barrier into the alveolar air space. However, it is currently unclear which of the infected resident lung cell populations, alveolar epithelial cells or alveolar macrophages, elicit monocyte recruitment during influenza A virus infection. In the current study, we investigated whether influenza A virus infection of primary alveolar epithelial cells and resident alveolar macrophages would elicit a basal-to-apical monocyte transepithelial migration in vitro. We found that infection of alveolar epithelial cells with the mouse-adapted influenza A virus strain PR/8 strongly induced the release of monocyte chemoattractants CCL2 and CCL5 followed by a strong monocyte transepithelial migration, and this monocytic response was strictly dependent on monocyte CCR2 but not CCR5 chemokine receptor expression. Analysis of the adhesion molecule pathways demonstrated a role of ICAM-1, VCAM-1, integrin-associated protein (CD47), and junctional adhesion molecule-c on the epithelial cell surface interacting with monocyte beta(1) and beta(2) integrins and integrin-associated protein in the monocyte transmigration process. Importantly, addition of influenza A virus-infected alveolar macrophages further enhanced monocyte transmigration across virus-infected epithelium in a TNF-alpha-dependent manner. Collectively, the data show an active role for virus-infected alveolar epithelium in the regulation of CCL2/CCR2-dependent monocyte transepithelial migration during influenza infection that is essentially dependent on both classical beta(1) and beta(2) integrins but also junctional adhesion molecule pathways.

Animals↗

PubMed2002

Human monocytic cell lines transformed in vitro by Epstein-Barr virus display a type II latency and LMP-1-dependent proliferation.

Epstein-Barr virus (EBV) classically infects and transforms B lymphocytes in vitro, yielding lymphoblastoid cell lines (LCLs). In contrast to other herpesviruses, EBV is not described as an infectious agent for monocytes. However, recent papers described in vitro infection of monocytes leading to abortive or transient viral expression. In the present study, we report the characterization of E1, a monocytic cell line infected and transformed by EBV. This cell line was derived from an LCL by a drastic electroporation and selection of neomycin-resistant cells, unfavorable to B-cell outgrowth. E1 expressed surface molecules of monocytic lineage (CD14, major histocompatibility complex class II, and CD80) and the c-fms gene, a highly specific marker for the monocytic lineage. This cell line is able to phagocytose and secrete proinflammatory monokines tumor necrosis factor alpha, interleukin-6 (IL-6), and IL-8. E1 cells are tumorigenic after injection in nude mice, and a monocytic cell line obtained from one of these tumors (TE1) displayed immunophenotype and functional properties similar to those of E1. We detected the presence of the EBV genome in both cell lines, as well as expression of the EBNA-1 and LMP-1, but not EBNA-2, viral genes, characteristic of a type II latency. LMP-1 influences the phenotype of these monocytic cell lines, as demonstrated by down-regulation of cell proliferation and membrane intercellular adhesion molecule 1 expression due to an LMP-1 antisense strategy. This is the first description of a latently infected human monocytic cell line and the first direct demonstration of an instrumental role for LMP-1 in the proliferation of EBV-transformed cell lines expressing a type II latency.

Animals↗

PubMed2005

Gene expression alterations of human peripheral blood monocytes induced by medium-term treatment with the TH2-cytokines interleukin-4 and -13.

The TH2-cytokines interleukins-4 and -13 severely alter gene expression of monocytic cells. We quantified the impact of interleukins-4 and -13 on the gene expression pattern of human peripheral blood monocytes applying a strategy that involved microarray hybridization, RT-PCR, immunohistochemistry and activity assays. After 3 days of continuous cytokine exposure the six most strongly upregulated gene products (15-lipoxygenase-1, fibronectin, monoamine oxidase-A, CD1c, CD23A, coagulation factor XIII) included four proteins with potential anti-inflammatory properties: (i) 15-lipoxygenase-1 (290-fold upregulation), (ii) fibronectin (180-fold upregulation), (iii) monoamine oxidase-A (56-fold upregulation) and (iv) coagulation factor XIII (35-fold upregulation). In addition, a number of other gene products, the expression of which is consistent with inflammatory resolution (annexin 1, collagen 1alpha2, laminin alpha5, TIMP3, heme oxygenase-1, CCL22, heat shock protein A8), were upregulated to a lower extent. In contrast, expression of classical pro-inflammatory gene products, such as tumor necrosis factor alpha, monocyte chemotactic protein-1, interleukins-1, -6, -8, -18, cyclooxygenase-2, as well as enzymes and receptors of the leukotriene cascade (5-lipoxygenase, 5-lipoxygenase activating protein, leukotriene B(4) receptor, cysteinyl leukotriene receptor 2) were significantly downregulated. These data suggest that medium-term treatment of human peripheral blood monocytes with interleukins-4/13 alters the gene expression pattern so that the cells might adopt a resolving phenotype.

Anti-Inflammatory Agents↗