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  • 1
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We have studied the expressions of various protein kinase C (PKC) isoenzymes in T cells and monocytes from patients with systemic lupus erythematosus (SLE), in comparison to those of healthy controls and patients with other immunological disorders. As measured by Western blotting, the levels of PKCβ, δ, η, ε, θ and ζ (but not of PKCα) significantly decreased in T cells of SLE patients. In monocytes, however, we observed marked suppressions only in the expressions of PKCδ, ε and ζ but not in the expressions of other PKC isoforms. In vivo corticosteroid application, as well as in vitro steroid treatment of monocytes, elevated the expressions of most isoforms close to normal values; however, the decreased levels of PKCθ and ζ were not affected by steroid application. These alterations were characteristic to SLE because we could not detect any changes in the PKC levels in mononuclear cells of primary Sjögren's syndrome and mixed connective tissue disease patients. These results suggest that impaired PKC isoenzyme pattern may exist in the T cells and monocytes of SLE patients. Furthermore, the clinically efficient glucocorticoid application in SLE can increase the expression of some members of PKC system.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 13 (1986), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: We have studied the distribution of IgG heavy chain markers (Gm) among 90 Hungarian patients with systemic lupus erythematosus (SLE) (55 of whom were also typed for HLA). This study confirms previously described increases in HLA-B8 and DR3 in this condition. No difference in the distribution of Gm phenotypes was found between patients and 168 controls from the same geographical area. HLA-B8/Gm homozygous individuals were, however, at greater risk for SLE (relative risk = 5.13) compared to B8+Gm heterozygotes or B8− individuals, irrespective of Gm phenotype. When patients with renal manifestation (n= 40) were compared to those without, the Gm phenotype 3; 5, 13 was found to be significantly increased (x2= 10.36, P 〈 0.0001, relative risk (RR) = 4.69). HLA and Gm increased additively the risk for renal manifestations in that for those patients who were both Gm3;5,13+ and HLA-B8+, PR was 110, while it was 21.2 for Gm3;5, 13−/B8+, 7.9 for Gm3;5, 13+/B8− and 1.0 for Gm3;5, 13−/B8− patients. The study suggests that combined HLA and Gm typing can be used to identify SLE patients at high risk for manifesting renal abnormalities.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 40 (1994), S. 0 
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The expression of FcγRI, FcγRII, and FcγRIII (the IgG receptors CD64, CD32, CD16) as well as CR3 (the C3bi receptor, CD11b) on monocytes in the blood of patients with systemic lupus erythematosus (SLE) was investigated. The relationship between the receptor expression and the serum immune complex (IC) concentration was analysed. The decrease in mean fluorescence intensity (FI) of the FcγRII of patients' monocytes stained by specific monoclonal antibodies (MoAb IV3) was very close to statistical significance (P= 0.052). The expression (FI) of CR3 (using MoAb OKM1) on monocytes of patients was also decreased, but not significantly. The detected decrease of FcγRII and CR3 was inversely correlated with the high circulating immune complex level in patients' sera. At the same time, FcγRI expression on SLE monocytes (using MoAb 32) was significantly elevated and this change was in parallel with the serum IC concentration.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 24 (1986), S. 0 
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The binding of 125I-labelled anti-bovine serum albumin (BS A)-BSA immune complexes (IC). giving a final molar antibody to antigen ratio of 1:1. to monocytes isolated from 18 patients with systemic lupus erythematosus (SLE) and from 10 normal healthy donors was quantitatively investigated. The degradation of the hound IC by the same monocytes was kinetically determined at the same time. The assays were performed on monocyte monolayers. Scatchard plots at 4°C demonstrated that monocytes from patients with active SLE expressed a mean Fey receptor (FcR.) number that was 22% higher than that of the controls, although this did not reach statistical significance. The FcR number of normal monocytes and the degradation rate of anti-BSA-BSA complexes by the same cells showed a positive correlation. At the same time, the digestion of anti-BSA-BSA complexes by monocytes of SLE patients with active disease was prolonged, despite their enhanced FcR-ligand binding. The dissociation of FcR-ligand binding and FcR-mediated degradation suggests that the IC degradation is controlled by altered biochemical mechanisms in the monocytes of SLE patients.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1440
    Keywords: Human neutrophil granulocyte ; Leukotriene B4 ; Phospholipase A2 ; Platelet-activating factor ; Prostaglandin F1α, F2α
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The simultaneos presence of platelet-activating factor, leukotriene B4, prostaglandin F1α and F2α are detectable in the supernatant of human neutrophil granulocytes treated with phospholipase A2 of human monocytes. This enzyme is suspected to play an important role in the pathomechanism of inflammation.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0584
    Keywords: Phagocytosis ; Neutrophils ; Monocytes ; Flow cytometry ; Neutral red
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In a new, simple, and fast flow-cytometric method for the simultaneous measurement of phagocytic activity of human neutrophils and monocytes in whole blood, the fluorescence capability of the well-known vital stain, neutral red was used. The incubation of 0.5 ml heparinized human blood with the phagocytic stimulus of zymosan dose- and time-dependently increased the percentage and the red fluorescence intensity of both neutrophils (4.3±1.2 times) and monocytes (2.7±0.7 times) measured cytofluorimetrically. Decreased uptake of neutral red was observed in a patient with phagocytic disorder, based upon impaired engulfment of particles and production of reactive oxygen species. In a patient with chronic granulomatosis, however, no decrease of neutral red uptake was measured. Platelet activating factor and phorbol myristate acetate were also able to increase the uptake of neutral red by both monocytes and neutrophils, but to a lesser extent than zymosan. The advantage of this method is the possibility for the simultaneous measurement of phagocytic activities of monocytes and neutrophils stimulated by either particles or soluble activators. This method is suitable for the selective measurement of activation processes not related to the production of free radicals in the phagocytes.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Annals of hematology 63 (1991), S. 45-48 
    ISSN: 1432-0584
    Keywords: Suramin ; Phagocyte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the therapeutically important range (100–200μg/ml), suramin was found to increase the phagocytic activity of human monocytes (measured by the uptake ofSaccharomyces cerevisiae and sensitized sheep red blood cells) in vitro. Suramin itself was a chemotactic signal for monocytes and increased the chemiluminescence of neutrophil granulocytes. Suramin seems to act via the ATP-binding P2 receptors of human phagocytes.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-0584
    Keywords: Key words Ceramide ; Neutral red ; Neutrophil ; Monocyte ; Lymphocyte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Neutral red is a vital stain known to be accumulated in the lysosomes of neutrophils and monocytes. It is used mainly to identify and detect the activated state of these cells. We have found that the extracellular application of physiological ceramide, i.e., a product of sphingomyelin hydrolysis and a newly defined intracellular second-messenger substance, increased the uptake of neutral red in a dose-dependent manner in human neutrophils, monocytes, and lymphocytes, as demonstrated by flow cytometry. Staurosporine was able to totally block this phenomenon, suggesting the involvement of protein kinase C in the process. These results indicate that the flow-cytometric analysis of ceramide-induced uptake of neutral red can be a new method for the evaluation of lysosome-related activation processes in both phagocytes and lymphocytes.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 283 (1991), S. 418-418 
    ISSN: 1432-069X
    Keywords: Localized scleroderma ; Autoantibodies ; Organ symptoms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-0584
    Keywords: Phospholipase A2 ; Platelet ; Monocyte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Phospholipase A2 (PLA2) activity was found and measured in the cell-free supernatants of human mononuclear cells (monocytes and lymphocytes) cultured with platelets for 48 h at 37° C. The relative molecular mass of purified, calcium-dependent PLA2 was 14 kD. The amount of PLA2 in the supernatants correlated positively with the number of monocytes and platelets in the cultures. Electron microscopically, direct cell-to-cell interactions of monocytes and platelets were observed. Cultivation of suspensions of human mononuclear cells with platelets in serum-free medium was found to be an efficient way to produce and purify human secretable PLA2. In the release of secretable PLA2 in peripheral blood, the interactions between platelets and monocytes may play a considerable role.
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