Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UNIPROT:P04141 (granulocyte-macrophage colony-stimulating factor)
 6,790 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Macrophage-like synoviocytes originate in the bone marrow, like other mononuclear phagocytes, and are constantly replaced via the circulation. In rheumatoid synovium sections, 80-100% of the synovial lining cells are macrophage-like cells functioning as antigen processing- and antigen-presenting cells to T lymphocytes. Monocyte and lymphocyte traffic into the rheumatoid arthritis (RA) synovium is mediated by adhesion molecules such as endothelial-leukocyte adhesion molecule-1 (ELAM-1), vascular cell adhesion molecule-1 (VCAM-1), intercellular adhesion molecules-1 and -2 (ICAM-1 and ICAM-2), as well as monocyte chemotactic protein 1 (MCP-1) and beta 2 integrins (CD11 a,b,c/CD18). Macrophage-like cells in the RA synovium are highly activated based on their morphology, surface class II HLA antigen expression, and synthesis of cytokines such as interleukin-1 beta (IL-1 beta), tumor necrosis factor alpha (TNF-alpha), interleukin-6 (IL-6), granulocyte-macrophage colony-stimulating factor (GM-CSF), macrophage CSF, and transforming growth-factor beta (TGF-beta). Evidence for type 1 (higher affinity) and type 2 (lower affinity) androgen (ARs) and estrogen receptors (ERs) on macrophage-like synoviocytes in either male or female synovial samples from both RA patients and controls has been reported. In particular, ERs have also been found on CD8+CD29+ CD45R0+ T lymphocytes (memory), infiltrating rheumatoid synovial tissues. Sex hormones have been found to influence macrophage activity in experimental and clinical conditions such as RA. Generally estrogens have immunostimulatory effects, whereas androgens are immuno-suppressive.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Macrophages, synovial tissue and rheumatoid arthritis. 839 94

This study was undertaken to investigate the immunomodulatory effect of clarithromycin against synovial fibroblast-like cells (synoviocytes). Synovial tissue obtained from rheumatoid arthritis (RA) or osteoarthritis (OA) patients was enzymatically digested to separate synoviocytes. The synoviocytes were cultured with or without cytokines in the presence of various concentrations of clarithromycin. The expression of costimulatory molecules was examined on the surface of the synoviocytes, using specific MoAbs and flow cytometry. The production of cytokines by synoviocytes was also measured using an immunoenzymatic assay. Finally, autologous T cells were stimulated by interferon-gamma (IFN-gamma)-treated synoviocytes in response to purified protein derivative (PPD). In some experiments, MoAbs specific for costimulatory molecules or clarithromycin were added and 3H-thymidine incorporation was counted. Intercellular adhesion molecule-1 (ICAM-1), LFA-3 and vascular cell adhesion molecule-1 (VCAM-1) were detected on the surface of both RA and OA synoviocytes. However, ICAM-2, B7-1 and B7-2 were not detected, and cytokines failed to induce these molecules. Both spontaneous and up-regulated expression of ICAM-1, LFA-3 and VCAM-1 by IFN-gamma, IL-1beta or 12-o-tetradecanoyl phorbol 13-acetate (TPA) were markedly suppressed by clarithromycin in a dose-dependent manner at concentrations between 0.1 and 10 microg/ml. The production of IL-1beta, IL-6, IL-8, granulocyte colony-stimulating factor (G-CSF) and granulocyte-macrophage colony-stimulating factor (GM-CSF) but not IL-1alpha and tumour necrosis factor-alpha (TNF-alpha) by synoviocytes was detected. Clarithromycin significantly suppressed the production of these cytokines, but did not enhance IL-10 production. Finally, autologous T cells were stimulated by IFN-gamma-treated synoviocytes in response to PPD. As clarithromycin suppressed HLA-DR and costimulatory molecule expression was enhanced by IFN-gamma, autologous T cell proliferation was markedly inhibited by clarithromycin. Clarithromycin has a considerable immunosuppressive effect on synoviocytes by inhibiting costimulatory molecule expression, cytokine production and antigen-specific T cell proliferation induced by synoviocytes.
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PMID:Inhibitory effect of clarithromycin on costimulatory molecule expression and cytokine production by synovial fibroblast-like cells. 909 36

The LFA-1 adhesion molecule is involved in cell adhesion events of leukocytes through binding to ICAM-1, ICAM-2 and ICAM-3. Whether binding to either of these ligands similarly affects co-stimulation of T cells and cytokine secretion is unknown. We demonstrated that LFA-1 co-stimulation under suboptimal concentrations of anti-CD3 monoclonal antibodies resulted in high, intermediate and weak proliferation of T cells on ICAM-1, -2, and -3, respectively, which correlates with the distinct affinities of LFA-1 for these ligands. Furthermore, we investigated whether binding to ICAM-1, -2 or -3 induced different cytokine profiles, thus regulating T helper cell function. Granulocyte-macrophage colony-stimulating factor and IFN-gamma were secreted in high amounts, whereas IL-2, IL-4 and IL-5 could not be detected. Interestingly, we observed that LFA-1/ICAM-1 co-stimulation of T cells resulted in high production of the Th2 cytokine IL-10 compared to ICAM-2 or ICAM-3 co-stimulation. In contrast, ICAM-2 and ICAM-3 induced a much stronger secretion of the Th1 cytokine TNF-alpha compared to LFA-1/ICAM-1 induced co-stimulation, despite the lower proliferation rate. These results demonstrate that besides facilitating cell adhesion, LFA-1 serves as a potent co-stimulatory molecule by inducing different cytokine patterns depending on the ligand bound.
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PMID:Co-stimulation of T cells results in distinct IL-10 and TNF-alpha cytokine profiles dependent on binding to ICAM-1, ICAM-2 or ICAM-3. 1042 88