title: Clonal anergy induced in a CD8+ hapten-specific cytotoxic T-cell clone by an altered hapten-peptide ligand.
abstract: Clonal T-cell anergy has been proposed as a mechanism to ensure peripheral tolerance in vivo. Anergy has been reported to result from T cell activation with inappropriate antigen-presenting cells (APC) or, in the case of CD4+ T cells, also by altered peptide ligands. This study reveals that altered hapten ligands can also induce anergy in CD8+ T cells. The Kb-restricted, trinitrophenyl (TNP) specific cytotoxic T lymphocyte (CTL) clone E6 was found to lyse target cells presenting the TNP-modified peptides M4L-TNP (derived from mouse serum albumin) or O4TNP (derived from chicken ovalbumin), but not the corresponding dinitrophenol (DNP)-modified peptides. However, whereas M4L-DNP was found totally unreactive, O4DNP antagonistically inhibited M4L-TNP-mediated kill if expressed on the same target cell. Moreover, when presented alone on APC, O4DNP, but not M4L-DNP, induced anergy in clone E6 by preventing its subsequent proliferative response to M4L-TNP. The anergic state did not affect agonist-specific cytolysis or T-cell receptor (TCR) down-modulation by the anergized CTL, and proliferative responses were regained upon addition of interleukin (IL)-2 or IL-12 plus IL-18. These findings substantiate the similarity between hapten-and peptide-recognition by T cells. The induction as well as the reversal of anergy in CD8+ CTL may thus be of relevance not only in autoimmunity or tumour rejection, but also in contact hypersensitivity reactions to haptens.
authors.affiliation: Max-Planck-Institute for Immunobiology, Stübeweg 51, D-79108 Freiburg, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Preckel
authors.forename: S
authors.initials: S
authors.lastname: Hellwig
authors.forename: U
authors.initials: U
authors.lastname: Pflugfelder
authors.forename: M B
authors.initials: MB
authors.lastname: Lappin
authors.forename: H U
authors.initials: HU
authors.lastname: Weltzien
mesh_terms: D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D018929:Cell Culture Techniques; D002455:Cell Division / Q000276:immunology; D017635:Clonal Anergy / Q000276:immunology*; D003602:Cytotoxicity, Immunologic; D018984:Epitopes, T-Lymphocyte / Q000276:immunology; D006241:Haptens / Q000276:immunology*; D008024:Ligands; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D010047:Ovalbumin / Q000276:immunology; D010455:Peptides / Q000276:immunology; D011948:Receptors, Antigen, T-Cell / Q000378:metabolism; D014301:Trinitrobenzenes / Q000276:immunology
chemical_list: D018984:Epitopes, T-Lymphocyte; D006241:Haptens; D008024:Ligands; D010455:Peptides; D011948:Receptors, Antigen, T-Cell; D014301:Trinitrobenzenes; D010047:Ovalbumin