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  • Articles  (22,816)
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Journal
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 15 (1988), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: IgA2 serum levels were measured by ELISA in 120 healthy subjects from 40 nuclear families (both parents and one offspring). No sex-associated difference was observed. Moreover, the IgA2 serum levels proved to be significantly correlated in parent-offspring pairs (r=0·55; P 〈 0·001), while there was no significant correlation in mother-father pairs of the same family. The data suggest that the serum level of the IgA2 subclass is genetically controlled.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 15 (1988), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: We have utilized a group of MHC class I genes produced by in vitro recombination between Dp and Dd to study recognition of MHC class I molecules by cytolytic T cells (CTLs). Both polyclonal allo-specific and H-2-restricted CTLs require that α1 and a2 of the target class I molecule be derived from the same haplotype for efficient killing. By using T-cell lines we showed that within the bulk population there must exist a fraction of T cells which can recognize epitopes in al or α2. Critical residues for T-cell recognition have been identified using these chimeric genes.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 15 (1988), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Transplantation tolerance was induced in mice by inoculating newborn animals with semi-allogeneic haematopoietic cells. The mice rendered tolerant were treated within the first week of birth, or at the time of grafting (age 7–8 weeks), with recombinant interleukin-1 (rIL-1) or interleukin-2 (rIL-2). The effects of these treatments on tolerance induction were monitored in terms of skin allograft survival. Treatment of newborn mice with rIL-2 abolished tolerance induction in nearly all tested animals. When administered at the time of grafting, both rIL-1 and rIL-2 decreased the proportion of tolerant animals. However, these modulation effects of interleukins were only observed in strain combinations with genetic differences at the K end of H-2 or in the entire H-2 complex, in which it is difficult to establish permanent tolerance; no effects of interleukins on tolerance induction were found in a strain combination with a relatively weaker genetic barrier represented by incompatibility at the D region of the H-2 complex.
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 15 (1988), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 5
    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
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 15 (1988), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Staphylococcal enterotoxin B (SEB) is a T cell mitogen with properties different from the plant lectin mitogens. We examined the stimulation of mitogenesis induced by SEB in BALB/c mouse spleen cells and its relationship to major histocompatibility complex (MHC) and related cell surface proteins. Based on the ability of specific monoclonal antibodies to block mitogenesis, SEB stimulation appears to be more dependent on interaction with I-E than with I-A class II MHC molecules. Additionally, anti-L3T4, and possibly other antibodies specific for proteins related to the T cell receptor complex, were inhibitory. When A20 cells were treated with SEB and used to stimulate BALB/c spleen cells which were not otherwise exposed to SEB, the treated A20 cells were capable of stimulating mitogenesis of the BALB/c spleen cells. The data support the hypothesis that SEB stimulation is mediated primarily by interactions with class II MHC proteins and possibly proteins in the T cell receptor complex. We also observed that the presence of SEB in DBA/2 (Mlsa)-stimulated BALB/c (Mlsb) spleen cell cultures enhanced the BALB/c mitogenesis three-fold over the sum of the SEB- plus Mls-stimulated mitogenesis. These results suggest that SEB may be a useful tool for further exploration of the Mls response.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 15 (1988), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: In the formation of a repertoire, T cells are selected through a window of autoreactivity which is defined by a low boundary representing the minimal autoreactivity required to enter the T-cell compartment and a high boundary which determines the highest admissible autoreactivity. We propose that the Mls gene product down regulates autoreactivity and thus modifies the formation of the T-cell repertoire. Given the polymorphism of Mls and the assumption that Mlsb is more inhibitory than Mlsd, it is conceivable that Mlsb (responder) mice admit into their T-cell compartment T cells with higher autoreactivity than Mlsd mice. We suggest that it is this highly autoreactive fraction of Mlsb T cells which responds in the overt Mls response. We show that Mls tolerance eliminates T cells responding in the overt Mls response but not T cells responding in the latent Mls response. This is consistent with the finding that T cells responding in the latent Mls response occur in Mlsb as well as in Mlsd mice.
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  • 8
    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
    Type of Medium: Electronic Resource
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  • 9
    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
    Type of Medium: Electronic Resource
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  • 10
    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: The classification of antigens into TD, TI-1 and TI-2 varieties raises the question of whether responses to these antigens are produced by distinct or identical subpopulations of B cells. In the present study we have examined the extent of intraclonal specificity variation in the progeny of PFC appearing after stimulation with two unrelated antigens. Mouse lymphoid cells were stimulated with pairs of TD and TI antigens, PFC were individually cultured and daughter PFC examined for their specificity. In all combinations used, PFC responding to TD antigen engendered, after 48 h of culture, a high frequency of PFC daughters expressing one or the other antibody specificity, notwithstanding the specificity of parental PFC. However, PFC responding to TI antigens seemed less subject to variation in specificity, and PFC daughters engendered after a 48 h culture period were, in the majority, of the parental specificity. These results are analysed in relation to different subpopulations of B cells.
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