Antigen presentation by keratinocytes induces tolerance in human T cells

European Journal of Immunology
V BalR Lechler

Abstract

Antigen recognition by interleukin 2 (IL 2)-producing T lymphocytes can lead to two distinct outcomes, depending on the nature of the antigen-presenting cell. Recognition of antigen presented by specialized antigen-presenting cells leads to T cell activation; in contrast, antigen presentation by cells which lack "accessory function" can lead to a state of specific nonresponsiveness, which is characterized by a failure to produce IL 2. We have shown in this study that co-culture of an HLA-DR1/4-restricted, influenza hemagglutinin-specific T cell clone with a specific peptide presented by interferon-gamma-induced DR4-expressing keratinocytes causes tolerance induction. This effect was DR restricted, in that it required pre-incubation of the T cell clone with keratinocytes expressing an appropriate DR type (DR4Dw14). The induction of T cell tolerance was also antigen specific; no inhibition resulted from pre-incubation of the clone with an irrelevant peptide. Furthermore cell to cell contact appeared to be necessary, and the addition of supernatant from interferon-gamma-induced keratinocytes did not cause any inhibition. This phenomenon may have relevance to the immunogenicity of transplanted cultured keratinocytes and to the effe...Continue Reading

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