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  • 1
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 40 (1994), S. 0 
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The functional role of the chicken homologue of CD28 was studied. It is expressed on all thymocytes, and both Vβ1- and Vβ2-family expressing peripheral αβ T cells. Peripheral γβ T cells are CD28-negative. Monoclonal antibody against CD28 had a costimulatory effect on T cells stimulated by phorbol myristate acetate (PMA), concanavalin A or MoAb against TCR. Vβl and Vβ2 expressing cells responded equally well to stimulation with anti-CD28 in combination with PMA. These responses were resistant to cyclosporin A, but inhibited by herbimycin A, suggesting that CD28 employs a signalling pathway at least partly distinct from that triggered by TCR/CD3. These data indicate a striking conservation of the costimulatory function of CD28 and emphasize the importance of this costimulatory pathway.
    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 40 (1994), S. 0 
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Little is known about the role of apoptosis in the regulation of γδ T cell development and function. We have used chicken as a model to study apoptosis of γδ T cells at different stages of their development. Apoptosis was measured with electrophoretic analysis of DNA fragmentation and flow cytometric determination of DNA content combined with immunofluorescence staining of cell surface molecules. In vitro culture, dexamethasone, and γ-irradiation induced apoptosis of both γδ TCR thymocytes and peripheral γδ T cells. Apoptosis could be induced even in the earliest thymic γδ thymocytes on embryonic day 13. Resting peripheral blood γδ T cells were more resistant to apoptosis than thymocytes and spleen cells. Following polyclonal activation of splenic γδ T cells by Con A, the proportion of the CD8+γδ T cell blasts decreased significantly when recultured without further stimulation. These results indicate that γδ T cells are susceptible to apoptosis in a manner similar o γδ T cells, and suggest that apoptosis plays an important role in the regulation of the development and function of both thymic and peripheral γδ T cells
    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 17 (1983), S. 0 
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: MHC class-I antigens on peripheral blood macrophages and bursa cells were analysed after adoptive bursa cell transfer to cyclophosphamide-treated immunodeficient chickens. We studied the expression of B-F locus-encoded antigens (B-F is homologous to mouse H-2K, D) on macrophages and B cells and found that macrophage B-F antigens are of host origin, whereas bursa cells express only donor-type B-F antigens. Both syngeneic and allogeneic bursa cells restored IgM antibody production to a T-cell-independent antigen, Brucella, but only syngeneic bursa cells could restore the IgG antibody response to a thymus-dependent antigen, sheep erythrocytes. The results indicate that B-cell maturation and macrophage-B-cell interaction are not MHC-restricted but that a restriction exists in T-cell-B-cell collaboration.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 10 (1979), S. 0 
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Maturation of bursal stem cells in an allogeneic environment was studied. The occurrence of surface IgM, surface IgG, and Ia-like antigens on B cells after differentiation within an allogeneic bursa was studied. Furthermore, the immediate capacity of B cells to form germinal centres after differentiation in an allogeneic bursa was studied by injecting them with histocompatible T cells into ‘test-tube’ birds. The results indicate that the switch to surface-IgG-bearing cells occurs in an allogeneic bursa in a similar manner as in a Syngeneic bursa. Studies of the occurrence of la-like antigens on bursa cells demonstrate that they retain their original Ia-like antigens, even during maturation in an allogeneic host. Third, the results demonstrate that after differentiation within an allogeneic environment bursa cells have acquired the immediate capacity to cooperate with histocompatible T cells as measured by germinal centre formation in ‘test-tube’ birds.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Ltd
    Scandinavian journal of immunology 54 (2001), S. 0 
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: CD5 is a transmembrane glycoprotein on all T cells and on a subpopulation of B cells. Based on the analysis of chicken CD5-cDNA we have previously shown that the structure of the CD5 protein is conserved between species. Here we report the isolation and chromosomal mapping of the chicken CD5 gene. The gene spans 3.4 kb and is extremely compact with a high GC-nucleotide content. There are 10 exons and the introns are spliced out similarly to those in the human CD5 gene. Each of the three extracellular scavenger receptor cysteine-rich (SRCR) domains is encoded as an exon of its own, as is the proline-rich hinge region that separates the first two membrane-distal SRCR domains. The fluorescence in situ hybridization (FISH) technique was used to map the gene to chromosome five. This is the first report describing the organization of the CD5 gene from a nonmammalian species.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 42 (1995), S. 0 
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: CDS is a heterodimeric cell surface glycoprotein expressed primarily on thymocytes and a subpopulation of mature T lymphocytes. It binds to the invariant part of the major histocompatibility complex class I molecule and participates in antigen recognition by the major histocompatibility complex class I restricted T cells. As in mammalian species, the majority of chicken thymocytes express both CD4 and CD8, whereas peripheral T cells are either CD4- or CD8-positive. We have created a panel of mouse monoclonal antibodies detecting different cell surface epitopes on chicken CD8. The antibodies precipitate a 32–34 kDa dimeric protein from surface labelled thymocytes under reducing conditions. The identical N-deglycosylation pattern confirms that these MoAb precipitate the same heterodimeric molecule from chicken thymocyte lysates. Binding of 11–38 and 11–39 MoAb to peripheral blood T cells is totally inhibited by 11–39 and previously characterized CT8 and EP72 MoAb, further confirming their CD8 specificity. CD8α-chain specificity of MoAb 11–39, 11–38, 11–30 and 11–13 is conclusively proven by staining COS-cells transfected with a plasmid containing CD8α cDNA. However, MoAb 11–13, 11–30 and 11–38 do not compete with MoAb 11–39 in binding to CD8. These results demonstrate recognition of different epitopes by these MoAb. Monoclonal antibodies detecting novel epitopes on chicken CD8 provide a valuable tool for further studies on T cell development.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 134 (1996), S. 0 
    ISSN: 1365-2133
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Summary Gold sodium thiosulphate (GSTS) In patch test series commonly yields positive reactions. In this study of dental patients, the clinical relevance of these positive reactions, the suitability of gold compounds as patch test materials, and value of the lymphocyte proliferation test in gold contact allergy, were evaluated. The frequency of positive patch test reactions to GSTS was 12·4% in the dental series. Fifty-two patients, only two of whom were male, were studied. Thirteen (25%) had had symptoms from jewellery or dental restorations. However, in most cases gold allergy was subclinical. A 10% aqueous solution of gold sodium thiomalate (GSTM) was almost as good as 0·5% GSTS in petrolatum as a marker of gold contact allergy, but 0·001% potassium dicyanoaurate (PDCA) yielded a high percentage of false-negative results. Seventy-three per cent of the subjects with positive patch tests to GSTS responded to gold compounds in vitro in the lymphocyte proliferation test, whereas 13 controls without gold contact sensitivity were negative. Consistent results in skin and lymphocyte proliferation tests provide support for the concept that gold salt-induced‘allergic-like' reactions are truly allergic in nature.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 49 (1994), S. 0 
    ISSN: 1365-2044
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: This study was set up to evaluate the effects of propofol infusion anaesthesia on immunological function in minor surgery. Twenty-seven patients (median age 51 years, ASA 1-2) scheduled for minor breast surgery were randomly assigned to two groups. Anaesthesia was induced in group 1 with propofol 2.5 mg.kg-1 and maintained with propofol 12 mg.kg-1.h-1 and 30% O2 in air, whereas in group 2 anaesthesia was induced with thiopentone 4 mg.kg-1 and maintained with 70% N2O in O2. Fentanyl and vecuronium were used in both groups. The percentages of T cells (p 〈 0.001), B cells (p 〈 0.01) and memory T cells increased (p 〈 0.01) in both groups. T helper cell percentages increased in the propofol but not in the thiopentone group (p 〈 0.05). The percentages of natural killer cells decreased from pre-induction values in both groups (p 〈 0.001). No changes were seen in lymphocyte proliferative responses. Minor breast surgery under propofol or conventional combined anaesthesia had only minor effects on the immune response. The higher percentage of T helper cells after propofol anaesthesia compared to conventional combined anaesthesia is beneficial, but its clinical importance remains to be determined.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Veterinary Immunology and Immunopathology 38 (1993), S. 375-386 
    ISSN: 0165-2427
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Medizin
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 28 (1988), S. 0 
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: We investigated cellular aspects of immunological tolerance to protein antigens in chickens by examining the immune responses of bursal and splenic cells from tolerant or normal chickens after transfer into cyclophosphamide (CP)-treated recipients. Newly-hatched chicks were made tolerant to bovine serum albumin (BSA) by injection of 100 mg of the antigen. When bursa cells from 4-day-old BSA-unresponsive chicks were transferred into CP-treated recipients, the reconstituted birds were able to respond to a subsequent injection of BSA almost as well as normal birds, and as well as CP-treated birds that had been reconstituted with normal bursa cells. To investigate whether the presence of the BSA antigen might affect recovery from tolerance, we injected CP-treated recipients with BSA at the time of transfer of bursal cells. The presence of the antigen prevented the recovery of the anti-BSA response in reconstituted birds. When spleen cells from 6.5-week-old unresponsive chicks were transferred into CP-treated recipients, no recovery of responsiveness to BSA could be demonstrated. A likely reason for the failure of splenic B cells to recover responsiveness on transfer is their inability to generate somatic variants of Ig genes in the same way as bursal stem cells. Thus, when the bursa involutes, the chicken's antibody repertoire may be frozen in a less adaptable state than that of a mammal.
    Materialart: Digitale Medien
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