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  • 1
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Adherence of human lymphocytes to allogeneic tumour cell monolayers was found to depend on the presence of monocytes. Adherent lymphocytes could lie separated from tumour cells by treatment with lidocaine followed by nylon wool passage. Tumour-adherent cells (70% E-RFC, 45% Fcγ-R, 23% Fcμ-R, 5% monocytes) exhibited enriched natural killer (NK) activity not only against the tumour cell line used for isolation but also against seven other targets. When T cells were isolated subsequently as E-rosettes by density gradient centrifugation through Percoll, the enrichment in cytotoxicity was even more pronounced. Tumour-adherent T cells were severalfold enriched in both N K and antibody-dependent cell-mediated cytotoxicity (ADCC) activity. However, this enrichment was not paralleled by a concomitant increase in the number of Tγ cells (tumour-adherent T cells: 17% Tγ, 40% Tμ: tumour-nonadherent T cells: 12% Tγ, 60% Tμ). Marked differences could be observed by staining with a monoclonal antibody that was raised against human leukaemic Tγ cells of high NK and ADCC activity. This antibody (T8–11) stained 60% of tumour-adherent T cells. 20% of nonadherent T cells and 29% of T-cell controls. These results indicate that the spontaneous cyloloxic activity of human T cells resides within a small population, most of which are characterized by a specific surface antigen but not by conventional Fcγ receptors.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 6 (1977), S. 0 
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: This paper describes the successful use of 125I-labeled IgG aggregate to detect Ia-type alloantibodies in pregnancy sera. The blockade of aggregate uptake of a variety of normal mononuclear and leukemic cell types by anti-Ia alloantibodies is analyzed. Fc receptors and Ia alloantigens are clearly two distinct molecular entities. The association between Fc receptors and Ia alloantigens on a quantitative level seems to depend on a ligand-binding mechanism to control their interaction rather than the presence of a topographical molecular tandem arrangement.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 5 (1976), S. 0 
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: An in vitro lymphocyte-mediated cytotoxicity assay using [3H]proline-labeled target cells is described. The assay, modified from an original procedure of Bean et al., assesses the release of [3H]proline by filtering the total culture fluid containing both trypsinized tumor cells and effector cells. Filtration is performed with a semiautomatic harvesting device using low suction pressure and large-diameter glass filters. Pretreatment of filters with whole serum diminishes adsorption of cell-free radioactive material considerably and thus increases the sensitivity of the assay. Nearly 100% of the radioactivity could be recovered with this harvesting device. The technique allowed the detection of cytolytic activities of lymphocytes after 6 h of incubation. Lymphocytes from patients with primary malignant melanoma showed a significantly higher cytolytic reactivity (P 〈 0.001) than normal donors’ lymphocytes against three different melanoma cell lines. In a series of parallel experiments on 36 patients and IS normal donors, this modification of the [3H]proline test was compared with three different assays: the conventional microcytotoxicity test of Takasugi and Klein, the original [3H]proline microcytotoxicity test of Bean et al., and the viability count of tumor cells.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 265 (1977), S. 158-160 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The data were obtained with an ADCC system5,6 consisting of cultured melanoma cells as target cells, different preparations of human peripheral blood lymphocytes as effector cells, and anti-melanoma cell antisera obtained from melanoma patients. The cytolytic activity of lymphocytes was measured by ...
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: To investigate the mechanisms of action underlying the therapeutic effect of CD4 monoclonal antibody therapy in rheumatoid arthritis (RA), clinical responses were compared with several laboratory parameters. Twenty-nine RA patients received either 10 mg, 50 mg or 100 mg of cM-T412, a chimeric CD4 MoAb, for 7 days. The CD4 binding sites on circulating lymphocytes were saturated directly with cM-T412 and serum levels of unbound cM-T412 accumulated towards day 7 of treatment only in the patients treated with 50 and 100 mg. The treatment induced an instant and prolonged depression of the number of circulating CD4+ cells, similar for all dosages. Clinical improvement was observed predominantly in the patients treated with 50 or 100mgcM-T412daily and did not correlate with changes in counts of circulating leucocyte subsets nor with changes in serum cytokine levels. An antiglobulin response against cM-T412 developed in a majority of the patients. Side effects on the first day of treatment were correlated with an increase of serum IL-6 levels. This study indicates that a favourable clinical effect of cM-T412 administration was associated with the presence of unbound cM-T412 in the circulation of RA patients. Therefore penetration of unbound cM-T412 into the site of inflammation might determine the therapeutic effect in RA.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 65 (1987), S. 546-550 
    ISSN: 1432-1440
    Schlagwort(e): Type I diabetes ; Autoimmunity ; Ia-antigen bearing cells ; ICA
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Peripheral blood lymphocytes have been investigated in 20 newly diagnosed type-I diabetics and 10 healthy subjects using monoclonal antibodies. Mononuclear cells were marked with anti-T-lymphocytes (Leu2, 3, 4, 12) and anti-Ia-antibodies (K14, L243) using indirect immunofluorescence. The percentage of circulating K14- and L243-positive cells was significantly higher in all diabetics than in normal controls. An increase in the number of K14-bearing cells was found in newly diagnosed patients with duration of less than 7 days (n=10) compared with diabetics of longer duration (1 to 8 months;n=10). Using dual-color immunofluorescence with fluorescein-conjugated anti-T-lymphocytes and rhodamin-conjugated anti-Ia-antibodies it was not possible to identify Ia-antigen bearing cells (Ia cells) as helper or suppressor lymphocytes. In addition, there was no significant difference in the number of Ia cells in diabetics with and without islet cell antibodies. It is concluded that there is evidence of activation of cellular immune response in type I diabetes, particularly in the early days of manifestation. However, previous assumptions that Ia cells represent T-cell activation have to be questioned.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Annals of hematology 46 (1983), S. 233-235 
    ISSN: 1432-0584
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    ISSN: 1432-0851
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The 3H-proline release test was used to measure spontaneous cytolytic activity of lymphocytes (CMC) from 94 melanoma patients after resection of the primary tumor. This assay showing a remarkable sensitivity and reproducibility allowed the detection of a certain disease-related pattern defined as preferential lysis of tumor cells when patients with mammary carcinoma and bladder tumor were tested simultaneously against corresponding tumor cells. This assay was applied to monitor short-term and long-term effects of BCG administered by repeated scarifications to the site of the primary tumor. Short-term changes of CMC occurring after BCG-administration were characterized by a sharp increase in some patients, in others by a decrease of CMC. When cytolytic activity was recorded at 4-week intervals for 6–9 months after BCG application, a distinctly decreasing pattern of CMC was observed in the majority of patients with signs of tumor progression, whereas no tumor progression during the observation period was seen in those patients with increasing CMC patterns.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 64 (1986), S. 1119-1123 
    ISSN: 1432-1440
    Schlagwort(e): Transferrin receptors ; Tumor cells ; Bone marrow cells ; Natural killer cells
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Two different experimental approaches based on the specificity of monoclonal antibodies (mAbs) have been taken to verify the hypothesis that the transferrin receptor (TfR) on proliferating cells serves as a common target structure for natural killer (NK) cells. Thus, by the lysostrip technique the TfR was removed from the surface of K562 and Molt4 tumor cells by incubation with two different anti-TfR mAbs. The effect of removal of the TfR was controlled by uptake of radiolabeled transferrin, and by binding of non-cross-reacting monoclonal anti-TfR receptor antibodies. Though the modulation of TfR on the membrane of viable cells was nearly complete, the cells remained fully susceptible to NK lysis. The second approach consisted in removal of TfR-bearing cells from bone marrow cell suspensions by an indirect rosetting technique. Using mAbs bound to ox erythrocytes the rosetted TfR-bearing cells could be removed from bone marrow cell suspension by density centrifugation with an efficiency of 〉99%. It could be shown that both fractions, TfR+ and TfR− cells, could be lysed to the same degree by NK cells. Thus, the evidence obtained speaks against a role of TfR as a recognition structure for NK cells.
    Materialart: Digitale Medien
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  • 10
    ISSN: 1432-1440
    Schlagwort(e): Tγ lymphocytes ; Monocytic antigens ; Natural cytotoxicity ; Antibody-dependent cellular cytotoxicity ; Tγ-Lymphozyten ; monozytäre Antigene ; spontane Zytotoxizität ; antikörper-abhängige zellvermittelte Zytotoxizität
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Zwei Patienten, bei denen wir eine Proliferation von Tγ Lymphozyten nachweisen konnten, boten ein ungewöhnliches klinisches Bild (disseminierte intravasale Gerinnung im Anschluß an eine niedrigdosierte Milzbestrahlung, isolierte absolute Neutropenie). Während bei einem Patienten ohne Zweifel eine maligne Erkrankung vorlag, ist bei dem anderen Patienten eher eine reaktive Zellproliferation anzunehmen. Neben T-Zell-Oberflächeneigenschaften wiesen die proliferierenden Zellen ein monozytäres Antigen auf. Sie zeigten keine Suppression der Differenzierung von B-Lymphozyten in Plasmazellen. Im Gegensatz dazu entwickelten die proliferierenden Zellen, besonders bei einem Patienten, deutlich spontane und antikörpervermittelte Zytotoxizität mit Melanom-und MOLT 4-Zielzellen. Bei dem zweiten Patienten konnten wir phagozytäre Eigenschaften der Tγ-Zellen nachweisen. Die Ergebnisse lassen vermuten, daß Untereinheiten der Tγ-Zellen Beziehungen zu monozytären Zellen aufweisen und daß diese Zellen sowohl spontane als auch antikörpervermittelte Zytotoxizität und teilweise phagozytäre Eigenschaften entwickeln können.
    Notizen: Summary Two patients suffering from proliferation of Tγ cells exhibited uncommon clinical features, such as activation of intravascular coagulation after low dose irradiation of the enlarged spleen in one patient and isolated neutropenia in the other patient. While the malignant nature of the disease was doubtless in one patient, cell proliferation in the other patient was more likely reactive. In addition to T cell determinants the proliferating cells expressed a monocytic antigen. They did not suppress B-lymphocyte differentiation into plasma cells. In contrast the proliferating cells, especially in one patient, acted as potent effectors in NK and ADCC using melanoma and MOLT 4 target cells. Erythrophagocytosis by Tγ cells was seen in one patient. The data suggest that subsets of Tγ cells are related to the monocytic lineage and that these cells can mediate both NKA and ADCC and partly can develop phagocytic activity.
    Materialart: Digitale Medien
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