Elsevier

Immunobiology

Volume 201, Issues 3–4, January 2000, Pages 332-346
Immunobiology

Consequences of Antigen Self-Presentation by Tumor-Specific Cytotoxic T Cells

https://doi.org/10.1016/S0171-2985(00)80088-1Get rights and content

Abstract

CDS-positive cytotoxic T cells (CTL) recognize antigenic peptides in combination with major histocompatibility complex (MHC) class I molecules on the surface of syngeneic antigen presenting cells (APC). In the present paper we show that cells from tumor antigen-specific CTL clones present their cognate antigenic peptide to other CTL from the same clone. Inter-CTL peptide presentation resulted in activation of the cells of one CTL clone to MHC-unrestricted lysis of bystander cells. In contrast to the behaviour of this clone, another CTL clone did not lyse bystander cells after incubation with the cognate peptide, but was activated to self-destruction. The human herpes virus Epstein-Barr virus is involved in the pathogenesis of a broad spectrum of human neoplasias. Using freshly established non-clonal T cells with specificity for a peptide derived from an Epstein-Barr virus encoded antigen we found again lysis of MHC mismatched bystander cells as a consequence of inter-CTL peptide presentation, indicating that bystander lysis following antigen self-presentation is not a phenomenon restricted to long-term in vitro cultured T cell clones. The potential implications for immunosurveillance against cancer and for tumor escape mechanisms are discussed.

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    ***

    Prof. Dr. Angelika B. Reske-Kunz, Klinische Forschergruppe Allergie, Universitäts-Hautklinik/Verfügungsgebäude, Obere Zahlbacher Str. 63, D - 55131 Mainz, Germany, Phone: +49-61 31-17 33 49, Fax: +49-61 31-17 33 64,

    *

    Present address: Faculty of Chemistry, Biochemistry II, University of Bielefeld, D - 33615 Bielefeld, Germany

    **

    Present address: Molecular Immunology Group, Institute of Molecular Medicine, John Radcliff Hospital, Headington, OX3 9DU, UK

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