Abstract
T-cell lines established from individuals infected with human T-cell leukaemia virus (HTLV) or generated by co-cultivation of normal human T cells with HTLV-infected T-cells, express class II (HLA-D/DR or Ia) antigens of the major histocompatibility complex (MHC)1 and interleukin-2 (IL-2) receptors2. Because the expression of these markers characterizes the differentiation of immunologically activated T cells3, we have now explored the possibility that HTLV- infected T cells might be primed to autologous or allogeneic Ia antigens expressed by the infecting cells. Our studies on the capacity of HTLV-infected T cells to display responses on mixed lymphocyte culture indicate that such T cells as well as single-cell clones derived from them, react non-discriminatively to all known allelic variants of human HLA-D/DR antigens, including those expressed by the responding cells. This reaction is inhibited by antibody to human Ia and is not triggered by Ia-negative T-leukaemia cells. The structure recognized seems to be a common epitope determinant of human Ia antigens, as (HTLV-infected) T cells primed in vitro to one HLA-D/DR specificity display amplified responses to all other HLA-D/DR antigens. We therefore believe that autostimulation by a self-Ia determinant may trigger the clonal expansion of HTLV-infected T cells and potentiate autoimmune processes.
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Suciu-Foca, N., Rubinstein, P., Popovic, M. et al. Reactivity of HTLV-transformed human T-cell lines to MHC class II antigens. Nature 312, 275–277 (1984). https://doi.org/10.1038/312275a0
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DOI: https://doi.org/10.1038/312275a0
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