title: Defective CD8+ T cell peripheral tolerance in nonobese diabetic mice.
abstract: Nonobese diabetic (NOD) mice develop spontaneous autoimmune diabetes that involves participation of both CD4+ and CD8+ T cells. Previous studies have demonstrated spontaneous reactivity to self-Ags within the CD4+ T cell compartment in this strain. Whether CD8+ T cells in NOD mice achieve and maintain tolerance to self-Ags has not previously been evaluated. To investigate this issue, we have assessed the extent of tolerance to a model pancreatic Ag, the hemagglutinin (HA) molecule of influenza virus, that is transgenically expressed by pancreatic islet beta cells in InsHA mice. Previous studies have demonstrated that BALB/c and B10.D2 mice that express this transgene exhibit tolerance of HA and retain only low-avidity CD8+ T cells specific for the dominant peptide epitope of HA. In this study, we present data that demonstrate a deficiency in peripheral tolerance within the CD8+ T cell repertoire of NOD-InsHA mice. CD8+ T cells can be obtained from NOD-InsHA mice that exhibit high avidity for HA, as measured by tetramer (K(d)HA) binding and dose titration analysis. Significantly, these autoreactive CD8+ T cells can cause diabetes very rapidly upon adoptive transfer into NOD-InsHA recipient mice. The data presented demonstrate a retention in the repertoire of CD8+ T cells with high avidity for islet Ags that could contribute to autoimmune diabetes in NOD mice.
authors: Section of Infectious Diseases, Yale University School of Medicine, New Haven, CT 06520, USA.
authors: H T
authors: HT
authors: Kreuwel
authors: J A
authors: JA
authors: Biggs
authors: I M
authors: IM
authors: Pilip
authors: E G
authors: EG
authors: Pamer
authors: D
authors: D
authors: Lo
authors: L A
authors: LA
authors: Sherman
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D001324:Autoantigens / Q000378:metabolism; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000821:virology; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics / Q000276:immunology; D018984:Epitopes, T-Lymphocyte / Q000235:genetics / Q000276:immunology; D019267:Hemagglutinin Glycoproteins, Influenza Virus / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D007108:Immune Tolerance / Q000235:genetics; D009980:Influenza A virus / Q000276:immunology; D008213:Lymphocyte Activation / Q000235:genetics; D051379:Mice; D008807:Mice, Inbred BALB C; D016688:Mice, Inbred NOD / Q000235:genetics / Q000276:immunology*; D008822:Mice, Transgenic; D011485:Protein Binding / Q000235:genetics / Q000276:immunology; D011828:Radiation Chimera / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000637:transplantation
chemical_list: D001324:Autoantigens; D018984:Epitopes, T-Lymphocyte; D019267:Hemagglutinin Glycoproteins, Influenza Virus