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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, U.K. and Cambridge, USA : Blackwell Science Ltd
    Scandinavian journal of immunology 43 (1996), S. 0 
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The authors investigated the effect of IVIg on T-cell proliferation induced by the superantigen, staphylococcal enterotoxin B (SEB). The addition of IVIg to normal PBMC stimulated with SEB resulted in a threefold increase in the proportion of CD3+ blast cells expressing Vβ3 and Vβ17, two subsets of T cells that selectively expand in the presence of SEB. There was no increase in the proportion of T-cell blasts expressing Vβ2, Vβ8 and Vβ13.6 antigens that do not respond to SEB in the absence of IVIg. As described previously, IVIg inhibited T-cell proliferation independently of Vβ specificity. The effects of IVIg were mediated by variable regions of immunoglobulins since they were reproduced with F(ab′)2 fragments of IVIg but not with purified Fc fragments of IgG. The observation that SEB-activated T cells are rescued from inhibition of proliferation by IVIg indicates that IVIg modulates the effects of superantigen on T cells. These results may be of relevance for understanding the mechanisms underlying the effects of IVIg in patients with diseases in which T-cell superantigens are of pathophysiological significance.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Epstein-Barr virus (EBV) infection of human B lymphocvtes involves a specific receptor closely associated with, or identical to, the C3d complement receptor, CR2, Thus. 25 out of 29 EBV-positive Burkilt's lymphuma (BL) cell lines but none of 15 EBV-negative BL lines were found to express C3 receptors. Furthermore, in vitro in association with EBV of six EBV-negative cell lines resulted in the expression of C3 receptors in association with that of EBV-determined nuclear antigen (EBNA). Rosette assays using erythrocytes coated with human C3b, C3bi, and C3d, inhibition of rosette formation with anti-receptor antibodies, and flow cytometry analysis of stained cells demonstrated that EBV-converted lines expressed C3b ami C3d receptors, CRl and CR2. Anti-receptor antibodies recognized an average of40,700 anti-CR1 and 140,000 anti-CR2 binding sites on an EBV-converted line(BL41/B95), whereas no specifie binding occurred on the corresponding EBV-negative (BL41) cells, Because CR1 and CR2 are involved in B-cell proliferation and/or differcntiation, enhanced expression of C3 receptors following the interaction between EBV and B celK and/or subsequent infection of the cells by EBV may provide a basis for positive control of B lymphocyte proliferation by EBV.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Recent views on autoimmune diseases invoke generalized but specific perturbations in antibody repertoires, rather than the clonally restricted or non-specific polyclonal alterations proposed thus far. The present experiments analyse serum antibody reactivities in 24 systemic lupus erythematosus (SLE) patients and 17 healthy controls, using a method that quantitatively scores a large number of antibody reactivities and allows for multiparametric statistical analyses. The results show global but relatively specific perturbations in SLE antibody repertoires, and identify novel disease-associated reactivity patterns. Furthermore, a time series analysis of serum antibodies over 3 months demonstrates instability of natural antibody repertoires in individual SLE patients, contrasting with their remarkable conservation in healthy donors. Moreover, the method used clusters controls and patients independently, and might prove of diagnostic value, once large data bases are established.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Scandinavian journal of immunology 53 (2001), S. 0 
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The induction of a mucosal immunity provides an additional principle of vaccination by preventing the entry of pathogens in the body. Albeit the fact that intensive research has been conducted on local vaccines, the major mucosal vaccine commercially available for human use remains the oral polio vaccine. We have previously demonstrated that parenteral vaccination in humans with tetanus toxoid (TT) results in a genital immunoglobulin (Ig)G antibody (Ab) response. Here, we show that injections of TT with no adjuvant induces an anti-TT response in the mucosal tissues of normal BALB/c mice. The response is multiregional, involves both IgG and IgA isotypes, and is long-lasting. Similarly, injections of haptens coupled to TT or to other diffusible proteins may induce mucosal Abs. These results led us to immunize normal BALB/c mice with a viral peptide coupled to TT by disulfide bridging. The hapten was a 17 amino acid peptide containing the ELDKWA sequence of human immunodeficiency virus (HIV)-1 gp41. A significant IgG and IgA Ab response to the immunizing peptide was induced in various mucosal tissues despite the presence of a suboptimal Ab response in the spleen. The results indicate that mucosal immunity to peptides that are candidates for human vaccinations may be achieved by parenteral adjuvant-free immunization with peptide coupled to TT.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Idiopathic membranous glomerulonephritis (MGN) is an immune complex nephropathy characterized by the subepithelial deposition of immunoglobulin (Ig)G. The pathogenesis of the disease remains largely unknown, but recent evidence suggests that human MGN may involve an autoimmune component. In the present study, we have analyzed the IgM and IgG antibody repertoires of patients with MGN towards self- and nonself-antigens using a technique of quantitative immunoblotting on a panel of whole human tissue or solubilized bacterial cell extracts as sources of antigens. Data were compared by means of multiparametric statistical analysis. We demonstrate that the antibody repertoires of self-reactive IgM and IgG in plasma of patients with MGN exhibit significantly altered patterns of reactivity, as compared with those of healthy controls. In contrast, multiparametric statistical analysis does not discriminate the reactivity patterns of IgM and IgG in plasma of patients and healthy controls towards nonself antigens. These observations indicate that a failure in the regulation of physiological self-reactivity is associated with immune complex nephropathy in MGN.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1365-2516
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The occurrence of factor VIII (FVIII) inhibitors is one of the major complications of the treatment of haemophilia A. We present this review as a description of the major players of the antiFVIII immune response, with particular emphasis on the nature and properties of the different antiFVIII antibodies, their mechanisms of action in inhibiting FVIII activity, their potential neutralization by anti-idiotypic antibodies, and the importance of the T cell in participating in the induction of FVIII inhibitors. We briefly conclude on the avenues that remain to be explored in order to establish efficient therapeutic approaches aimed at eliminating FVIII inhibitors in patients with haemophilia A.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science, Ltd
    Haemophilia 8 (2002), S. 0 
    ISSN: 1365-2516
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary.  Idiotypic vaccination has proven successful in several animal models and human trials. Here we suggest that the expression of cross-reactive idiotypes on factor VIII (FVIII) inhibitors of patients with haemophilia A, patients with anti-FVIII autoimmune disease and natural anti-FVIII antibodies of healthy individuals, together with the ability of anti-idiotypic reagents to neutralize anti-FVIII antibodies, provides a rationale for designing a vaccine strategy aimed at preventing the occurrence of or suppressing inhibitors, based on the induction of protective anti-idiotypes. Here we discuss the rationale supporting the concept of using idiotypic vaccination to prevent the occurrence of FVIII inhibitors in patients with haemophilia A.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 38 (1993), S. 0 
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Complement activation by HIV results in the binding of C3 fragments to the gp160 complex and enhanced infection of C3 receptor-bearing target cells. We have studied complement-mediated enhancement of infection of the human CD4-positive T-cell line HPB-ALL which expresses the CR1 (CD35) and CR2 (CD21) receptors for C3. CR1 and CR2 are present on 15% and 40% of normal peripheral blood CD4-positive T lymphocytes respectively. Opsonization of the virus with complement resulted in a 3- to 10-fold enhancement of infection of HPB-ALL cells, as assessed by measuring the release of p24 antigen in culture supernatants throughout the culture period. Blockade of CR2 with cross-linked anti-CR2 monoclonal antibodies decreased infection to the level observed with unopsonized virus. Blocking CR1 reduced complement-mediated infection by 50–80%. Experiments using serum deficient in complement factor I demonstrated that CR1 mediates the interaction between opsonized virus and T cells in addition to its ability to serve as a cofactor for the cleavage of C3b into smaller fragments that interact with CR2. A requirement for CD4 in complement-mediated enhancement of infection was observed with HIV-1 Bru but not with HIV-1 RF. Thus, CR1 and CR2 contribute in an independent and complementary fashion to penetration of opsonized virus into complement receptor-expressing T cells. Involvement of CD4 in infection with opsonized virus depends on the viral strain.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 38 (1993), S. 0 
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Polyreactivity was earlier recognized as a feature of naturally expressed autoantibodies in serum. In the present study, we have compared the reactivity on a panel of self antigens of affinity-purified anti-DNA and anti-thyroglobulin (TG) IgG autoantibodies from the serum of patients with systemic lupus erythematosus (SLE) and autoimmune thyroiditis with their affinity-purified counterparts isolated from the serum of healthy individuals. Anti-DNA autoantibodies exhibited a similar degree of polyreactivity whether originating from patients or from healthy adults. Natural anti-TG autoantibodies were also found to be polyreactive. Anti-TG autoantibodies from patients with Hashimoto's thyroiditis showed little or no polyreactivity. Natural anti-TG autoantibodies were equally polyreactive whether or not they belonged to a fraction of normal IgG that is connected through V regions with other IgG molecules from the same source. These results indicate that polyreactivity of autoantibodies is a feature that does not allow one to distinguish between natural and disease-associated autoantibodies as well as between V-region-connected and unconnected autoantibodies.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, U.K. and Cambridge, USA : Blackwell Science Ltd
    Scandinavian journal of immunology 44 (1996), S. 0 
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The authors have used a quantitative immunoblotting technique to analyse the antibody repertoire of IgM in cord blood and in the serum of young children, young adult males and aged males directed towards antigens in homologous tissues utilized as sources of self antigens. The reactivities of IgM with self antigens exhibited striking homogeneity and invariance among newborns. Self-reactive IgM repertoires of children, young adults and aged males were markedly conserved among individuals and comprised most of the anti-self reactivities that prevailed in neonates. Reactivities of IgM with bacterial antigens showed a high degree of homogeneity among newborns but were more diverse in children, young adults and elderly individuals. Diversity of IgM reactivities with self and non-self antigens did not vary significantly with aging. Principal component analysis (PCA) and linear discriminant analysis (LDA) of the data discriminated between self-reactive IgM repertoires of newborns and children, but failed to discriminate between repertoires of children, young adults and aged males. The data indicate that the self-reactive antibody repertoire of IgM differentiates during the first years of life and remains relatively constant thereafter.
    Type of Medium: Electronic Resource
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