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  • Title: Antigen-presenting T cells. II. Clonal responses of alloreactive and virus-specific self-restricted human cytotoxic T cell responses stimulated by T lymphoblasts.
    Author: Kabelitz D, Enssle KH, Fleischer B, Reimann J.
    Journal: J Immunol; 1987 Jan 01; 138(1):45-50. PubMed ID: 3097150.
    Abstract:
    The capacity of various stimulator cell types to present alloantigens or viral antigens to resting human CD8+ cytotoxic lymphocyte precursors (CLP) was analyzed in a limiting dilution culture system. Cell sorter-separated T lymphoblasts of both CD4+ and CD8+ phenotypes but not resting T cells were found to efficiently stimulate the clonal development of allogeneic CD8+ CLP. Thus, 5000 CD4+ T lymphoblasts activated as many (one out of 200 to one out of 300) allogeneic CLP as 50,000 peripheral blood mononuclear stimulator cells. This potent stimulator activity was found in CD4+ and CD8+ T lymphoblasts activated by mitogen, anti-T3 monoclonal antibody, or mixed leukocyte reactions. Cytotoxic T cells generated in this system were highly specific for HLA class I antigens. Furthermore, T lymphoblasts infected with mumps virus efficiently induced development of autologous CLP into CTL clones that were virus specific and self-HLA restricted, as shown by split-well analysis. The possible in vivo significance of antigen-presenting T lymphoblasts is discussed.
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