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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Medical microbiology and immunology 187 (1998), S. 49-52 
    ISSN: 1432-1831
    Schlagwort(e): Key words CTLA-4 ; Thymus ; CD4+ thymocytes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract CTLA-4 (CD152) is a T cell surface receptor with sequence homology to the co-stimulatory molecule CD28. The molecule, which is essential for the inhibitory regulation of the immune response, becomes transiently expressed on mature T cells after stimulation in vitro. In situ, CTLA-4+ T cells are enriched in the light zones of the germinal centers in human peripheral lymphoid organs. In this study we have studied expression of CTLA-4 in human thymus in situ. CTLA-4 was expressed on about one third of CD4+/CD8–/CD1– medullary thymocytes. CTLA-4 was acquired by a subset of immature (CD1+) thymocytes and lost from the mature (CD1–) subpopulation within 48 h of cell culture, suggesting that the expression on medullary thymocytes is transient. The demonstration of CTLA-4 on a substantial subpopulation of mature CD4+ thymocytes adds a new dimension to the understanding of this important molecule. When contemplating application of anti-CTLA-4 for therapy its potential influence on T cell maturation has to be taken into account.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Medical microbiology and immunology 185 (1997), S. 207-215 
    ISSN: 1432-1831
    Schlagwort(e): Key words Immune responses ; Filariasis ; Helminth infection ; Laboratory mouse model ; T cells
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Models of filarial infection in laboratory inbred mice are valuable tools for assessing the relevance of anti-filarial immune responses in protection against these parasites. However, laboratory mice are not permissive for those filarial species which are known to infect humans. Therefore, immunity to the different stages of these filariae, i.e. infective third stage larvae (L3), adults and microfilariae, has been analyzed separately, as a surrogate approach. Although much information has been gathered by analysis of immunity and intervention in particular immune responses in these experimental systems, interference of different stage-specific responses as well as modulation of filarial maturation by the immune system cannot be assessed. A newly established infection model of filariasis, namely infection of laboratory mice with Lito-mosoides sigmodontis, accommodates the full developmental cycle of the parasite and may overcome this deficiency. Although the disadvantage of this latter model is that it deals with a filaria which is not pathogenic to man, it is the only model in which immunity can be analyzed during maturation of infective larvae into adult worms, the period considered most important for vaccination studies.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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