UMLS:C0003873 - FACTA Search

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Query: UMLS:C0003873 (rheumatoid arthritis)
53,068 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Rheumatoid arthritis (RA) is an immune disease in which the pathological immune reaction is thought to be initiated by the presentation of an (auto) antigen or superantigen by MHC class II positive cells to CD4 T cells. These successive immunological events can be studied by the cytokines produced at the different stages. Cytokine secretion by stimulated cells in autologous diluted whole blood has allowed the study of the immune profile characteristic of rheumatoid arthritis. The pattern of RA patient whole blood cells cultured in autologous blood is characterized by hyperactivity of the mononuclear cells with high secretion of IL-1 beta, TNF-alpha and IL-6 and low production of IFN-gamma, in comparison with the normal (N) and osteoarthrosis (OA) populations. The IL-2 secretion pattern is unique, arising from production followed by consumption. This production-consumption turnover is the most elevated in the RA group. The T cells are indeed activated in rheumatoid arthritis but regulatory events suppress some of their functions. A correlation was found between the inflammatory proteins and mediators of cellular immunity and macrophagic function: IL-1 beta and the sedimentation rate; IL-6 and fibrinogen; TNF-alpha and the number of blood monocytes. The secretion of OA-stimulated whole blood cells was similar to RA for two monokines (overproduction of TNF-alpha and IL-6) and different for IL-1 beta, not different from normal in OA. Stimulated whole blood cell cytokine secretion profile from RA and OA groups, was the same as previously observed in synovial fluid.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Direct stimulation of cytokines (IL-1 beta, TNF-alpha, IL-6, IL-2, IFN-gamma and GM-CSF) in whole blood: II. Application to rheumatoid arthritis and osteoarthritis. 129 40

In order to investigate the relationships between cytokine production and arthritic disease we have determined the concentrations of immunoreactive interleukin-1 alpha (IL-1 alpha), IL-1 beta, IL-6, tumour necrosis factor-alpha (TNF-alpha), interferon-alpha (IFN-alpha), IFN-gamma, and soluble IL-2-receptor (sIL-2R), as well as bioactive IL-1 and IL-6, in synovial fluids (SF) and plasma of patients with a variety of arthritides. Careful assay revealed only minimal concentrations of IL-1, particularly its biologically active form, in SF. No IL-1 was detectable in the plasma of patients that had IL-1 in their SF. Concentrations of both immunoreactive IL-1 beta and TNF-alpha in SF of rheumatoid arthritis (RA) patients were significantly higher than those in SF from patients with other inflammatory arthritides or osteoarthritis (OA). IL-6 and sIL-2R concentrations in both SF and plasma were higher in RA patients than in OA patients, and were significantly correlated. Approximately half of the SF from patients with all arthropathies contained detectable IFN-alpha, whilst IFN-Y was present in less than 10%. There were significant associations between IL-6, sIL-2R, IL-1 beta, TNF-alpha and IFN-alpha. The concentration of these cytokines, where detectable, was also related to leukocyte counts in the SF, as well as to parameters assessing local and systemic disease activity. Although IL-6 was the cytokine most clearly related to other cytokines, and to parameters assessing disease activity, the relationship between general articular disease activity and IL-6 was only evident in patients with arthropathies other than rheumatoid arthritis.
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PMID:Cytokine inter-relationships and their association with disease activity in arthritis. 846 37

Recently in Japan, one form of vitamin B12, methylcobalamin also known as methyl B12, has attracted the attention of physicians as a therapy for patients with rheumatoid arthritis. However, its immunological actions in vivo are still unknown. In this study, we induced the in vitro production of such cytokines as interleukin-6 (IL-6), interferon-gamma (IFN-gamma), and interleukin-1 beta (IL-1 beta) by adding various mitogens (phytohemagglutinin:PHA, concanavalin A: ConA, or pokeweed mitogen:PWM) as well as recombinant interleukin-2, and we investigated the effects of methyl B12 (final concentration, 8-8,000 ng/ml) on the production of these cytokines by peripheral mononuclear cells. As compared to the controls, IL-6 production induced by PHA and ConA on Day 4 of the culture was suppressed by an average 60-70% when methyl B12 (80-8,000 ng/ml) was added to the medium. IFN-gamma production decreased dose-dependently with methyl B12, i.e., it decreased to 46% of the control when this production was induced by rIL-2, and decreased to 56-66% when it was induced by mitogens. The effect of methyl B12 on IL-1 beta production on Day I of the culture was small. These findings indicate that methyl B12 suppresses mainly the cytokine production of T lymphocytes. Such suppressive effects as shown in the in vitro situation are expected to be expressed also in vivo in patients with rheumatoid arthritis, especially at articulation lesion sites.
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PMID:Effects of methylcobalamin (vitamin B12) on in vitro cytokine production of peripheral blood mononuclear cells. 133 17

Interleukin 1 (IL-1), IL-6, and tumour necrosis factor (TNF) alpha are pleiotropic cytokines produced predominantly by macrophages which have been implicated in the pathogenesis of rheumatoid arthritis (RA). Sulphasalazine has been shown to have disease modifying properties and to inhibit the production of cytokines in vitro. To evaluate the effect of sulphasalazine on cytokine production in vivo, serum cytokine levels were measured in a group of patients with RA entered into a randomised controlled trial. Serum levels of IL-1 alpha, IL-1 beta, IL-6, and TNF alpha were measured at baseline and at two monthly intervals for six months in 17 patients receiving sulphasalazine and in 22 patients treated with placebo. The two groups of patients had a similar age and sex distribution, had had RA for less than a year, had no joint erosions, and had not been treated previously with any other disease modifying drugs. In the 39 patients studied IL-1 alpha was detected (> 0.1 ng/ml) at baseline in 14 patients (median 0.24 ng/ml), IL-1 beta in 25 patients (median 1.0 ng/ml), TNF alpha in 27 patients (median 1.2 ng/ml), and IL-6 in 33 patients (median 0.44 ng/ml). In the group treated with sulphasalazine there was a progressive and significant decline in serum IL-1 alpha, IL-1 beta, and TNF alpha levels over the six month period (median levels at six months were < 0.1, 0.12, and 0.44 ng/ml respectively). Interleukin 6 levels were significantly reduced only at the four month time point (median level of 0.23 ng/ml). These reductions were associated with improvements in clinical and laboratory measures of disease activity. In contrast patients receiving the placebo showed no changes in serum cytokine levels and no improvement in clinical and laboratory indices of disease activity. These results suggest that sulphasalazine may exert its disease modifying effect partly by suppressing cytokine production in vivo.
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PMID:Circulating cytokine levels in patients with rheumatoid arthritis: results of a double blind trial with sulphasalazine. 135 37

Interleukin 1 (IL-1) has been implicated as an inflammatory mediator in rheumatoid arthritis (RA). Many cell types, including macrophages, lymphocytes, fibroblasts, and endothelial cells, can produce IL-1 and it is known that IL-1 production is under transcriptional control. It has, however, been difficult to define in vivo the predominant cellular source of this mediator in RA. Here, we have used the combination of in situ hybridization of mRNA and cellular immunophenotyping with monoclonal antibodies to show that the IL-1 beta gene is expressed predominantly by CD14-positive macrophages in synovial tissue from patients with RA. Synovial macrophages were also associated with the immunoreactive IL-1 peptide. These cells appear to be the major source of IL-1 beta within the rheumatoid synovium in vivo and must be regarded as playing a central role in the chronic inflammation and joint destruction of RA.
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PMID:In situ hybridization of interleukin-1 in CD14-positive cells in rheumatoid arthritis. 137 28

Expression of vascular cell adhesion molecule-1 (VCAM-1) in synovial tissue was determined using the immunoperoxidase technique. Normal, rheumatoid arthritis (RA), and osteoarthritis (OA) synovia bound VCAM-1 antibodies in the intimal lining as well as blood vessels. The amount of VCAM-1 was significantly greater in the synovial lining of RA and OA tissues compared with normal synovium (p less than 0.002). There was also a trend toward greater levels of VCAM-1 staining in blood vessels of arthritic tissue (RA greater than OA greater than normal). Because VCAM-1 staining was especially intense in the synovial lining, VCAM-1 expression and regulation was studied on cultured fibroblast-like synoviocytes (FLS) derived from this region. Both VCAM-1 and intercellular adhesion molecule 1 were constitutively expressed on FLS. VCAM-1 expression was further increased by exposure to IL-1 beta, TNF-alpha, IL-4, and IFN-gamma. These cytokines (except for IL-4) also induced intercellular adhesion molecule 1 expression on FLS. ELAM was not detected on resting or cytokine-stimulated FLS. The specificity of VCAM-1 for FLS was demonstrated by the fact that only trace amounts were detected on normal and RA dermal fibroblasts. Cytokines induced intercellular adhesion molecule 1 display on dermal fibroblasts but had minimal effect on VCAM-1 expression. Finally, in adherence assays, Jurkat cell binding to resting FLS monolayers was inhibited by antibody to alpha 4/beta 1 integrin (VLA-4), CS-1 peptide from alternatively spliced fibronectin (which is another VLA-4 ligand), and, to a lesser extent, anti-VCAM-1 antibody. After cytokine stimulation of FLS, Jurkat-binding significantly increased, and this increase was blocked by anti-VCAM-1 antibody. Therefore, both CS-1 and VCAM-1 participate in VLA-4-mediated adherence to resting FLS in vitro, and VCAM-1 is responsible for the increase in Jurkat binding mediated by cytokines.
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PMID:Alpha 4/beta 1 integrin (VLA-4) ligands in arthritis. Vascular cell adhesion molecule-1 expression in synovium and on fibroblast-like synoviocytes. 138 43

Mononuclear cells from peripheral blood (PBMC) of rheumatoid arthritis (RA) patients and healthy controls were incubated with alpha-CD3. Cytokine secretion from 2 h to 72 h of incubation was measured by ELISA. There were no significant differences in secretion of T cell derived IL-2 and IL-4 in cultures from RA patients and controls. The macrophage-derived cytokines, IL-1 beta and tumour-necrosis factor-alpha (TNF-alpha) were secreted with a steep increase of concentration during the first 16 h of incubation by PBMC from RA patients. PBMC from healthy controls secreted both cytokines at a constantly rising rate with a maximum for TNF-alpha at 48 h and for IL-1 beta at 72 h. Interferon-gamma (IFN-gamma) is secreted in significantly reduced concentrations by PBMC from untreated RA patients compared with controls. Gold-salt treatment led to a slightly delayed and enhanced secretion of TNF-alpha and IL-1 beta, an enhanced secretion of IL-2 and a restored secretion of IFN-gamma.
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PMID:Kinetics of cytokine secretion by mononuclear cells of the blood from rheumatoid arthritis patients are different from those of healthy controls. 138 67

Cytokine release at the cartilage/pannus junction (CPJ) may be involved in cartilage destruction and tissue repair in rheumatoid arthritis (RA). Tissue samples of CPJ from 12 RA patients were examined for the presence of cytokines using immunohistochemical techniques with immunoaffinity purified F(ab')2 antibodies raised against recombinant human cytokines. Twenty-four areas of distinct CPJ at which a discrete junction between cartilage and overlying pannus exists were observed. In all specimens, tumour necrosis factor (TNF)-alpha, interleukin (IL)-1 alpha. IL-6, granulocyte-macrophage colony-stimulating factor (GM-CSF) and transforming growth factor (TGF)-beta 1 were detected in cells in pannus particularly along the surface of cartilage and at the site of cartilage erosion. Double immunofluorescence staining showed that most cytokine containing cells also labelled with a macrophage marker (CD68). About 50% of blood vessel endothelial cells stained for GM-CSF. Twelve areas of diffuse fibroblastic CPJ, at which an indistinct margin is seen between cartilage and pannus were examined. At this site, TGF-beta 1 was the only cytokine detected in fibroblast-like cells. None of these cytokines were detected in synovial tissue at the normal synovium/cartilage junction. Chondrocytes from all 11 normal specimens as well as those from RA patients stained for IL-1 alpha, TNF-alpha, IL-6, GM-CSF and TGF-beta 1, especially those close to subchondral bone. However, IL-1 beta, interferon-gamma and lymphotoxin were not detected in either the normal synovium/cartilage junction or rheumatoid CPJ.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Detection of cytokines at the cartilage/pannus junction in patients with rheumatoid arthritis: implications for the role of cytokines in cartilage destruction and repair. 139 70

Interleukin-1 (IL-1) is believed to be involved in articular destruction in rheumatoid arthritis. HLA-class II antigens are expressed on synovial cells of patients with RA. The relation between the production of IL-1 and expression of HLA-class II antigens was studied. Synovial cells of rheumatoid patients appeared to express HLA-DR and DQ antigens to a significantly greater extent than those of osteoarthritic patients. These cells produced IL-1 following interferon-gamma (IFN-gamma) stimulation and there was synergistic enhancement of production induced by IFN-gamma and monoclonal antibodies to HLA-DR or DQ antigens in combination. In the intracellular signal transduction mechanism for the production of IL-1 beta by these cells following IFN-gamma stimulation, protein kinase C and calmodulin may be involved as second messengers.
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PMID:[Induction of interleukin-1 production in the cultured synovial cells from patients with rheumatoid arthritis]. 141 92

Cytokines have been implicated in the regulation of eicosanoid synthesis and synovial cell proliferation. To further define these mechanisms, we have compared the effects of basic fibroblast growth factor and platelet-derived growth factor on cell growth, prostaglandin E2 (PGE2) production and phospholipase A2 enzyme activity in long-term cultures of synovial cells from rheumatoid arthritis (RA) patients capable of proliferating in serum-free medium. Compared with serum-free medium alone, RA synovial cell growth was significantly enhanced by adding either basic fibroblast growth factor (bFGF) or platelet-derived growth factor (PDGF) to the culture medium. Growing RA synovial cells for 14 days in serum-free medium plus bFGF caused them to spontaneously release significant amounts of PGE2, an effect not seen if cells were grown in serum-free medium alone, or serum-free medium plus PDGF. Enhanced release of PGE2 occurred when arachidonic acid was added to bFGF but not PDGF-treated RA synovial cells, suggesting that bFGF increased cyclooxygenase enzyme activity in these cells. Moreover, phospholipase A2 (PLA2) enzyme activity was found to be significantly greater in RA synovial cells grown for 14 days in serum-free medium containing bFGF alone, or bFGF plus interleukin 1 beta (IL-1 beta) compared with cells grown in either serum-free medium alone, or serum-free medium plus PDGF. Similarly, bFGF plus IL-1 beta-stimulated release of PLA2 activating protein, a novel mammalian phospholipase stimulator found in high concentrations in RA synovial fluid.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Regulation of synovial cell growth: basic fibroblast growth factor synergizes with interleukin 1 beta stimulating phospholipase A2 enzyme activity, phospholipase A2 activating protein production and release of prostaglandin E2 by rheumatoid arthritis synovial cells in culture. 142 Sep 99

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