A viral peptide can mimic an endogenous peptide for allorecognition of a major histocompatibility complex class I product.
Alloreactive class I-restricted T cells may recognize the class I structure alone, in association with a specific peptide, or with any stabilizing peptide. We have tested the role of endogenous peptides in the recognition of H-2Kb molecules by two alloreactive cytolytic T lymphocyte (CTL) clones using the mutant tumor line RMA-S, which expresses its surface H-2b molecules devoid of peptides and is not lysed by these two CTL clones. Empty H-2b molecules on RMA-S cells can be stabilized by binding exogenously added peptides. H-2Kb-specific recognition of the RMA-S cells by one of the CTL clones was restored by endogenous peptide extracts which only minimally stabilized H-2Kb on the surface of RMA-S cells, indicating the requirement for a specific peptide on a limited number of H-2Kb molecules. In addition, one out of three peptides which greatly enhance the expression of H-2Kb, the nucleoprotein peptide 52-59 from vesicular stomatitis virus (VSV), was also able to restore the lysis of RMA-S cells by the clone. The recognition of a common motif by an alloreactive clone (H-2k anti-H-2Kb) and virus-specific Kb-restricted clones suggests that both H-2k and H-2b thymic environments allow selection of T cells capable of recognizing H-2Kb+VSV and that tolerance to self, as would be the case in the (H-2k x H-2b)F1 mice, would partially delete the repertoire of antiviral T cells.
Guimezanes
A
A
Centre d'Immunologie, INSERM-CNRS de Marseille, Luminy, France.
Schumacher
T N
TN
Ploegh
H L
HL
Schmitt-Verhulst
A M
AM
D000595:Amino Acid Sequence; D000818:Animals; D000938:Antigen-Presenting Cells / Q000276:immunology; D002999:Clone Cells; D003429:Cross Reactions; D003601:Cytotoxicity Tests, Immunologic; D004306:Dose-Response Relationship, Immunologic; D005434:Flow Cytometry; D006183:H-2 Antigens / Q000096:biosynthesis / Q000276:immunology; D015395:Histocompatibility Antigens Class I / Q000276:immunology*; D007156:Immunologic Memory; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D010047:Ovalbumin / Q000276:immunology; D010222:Parainfluenza Virus 1, Human / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D014407:Tumor Cells, Cultured; D014721:Vesicular stomatitis Indiana virus / Q000276:immunology; D014764:Viral Proteins / Q000235:genetics / Q000276:immunology*
D006183:H-2 Antigens; C032876:H-2Kb protein, mouse; D015395:Histocompatibility Antigens Class I; D014764:Viral Proteins; D010047:Ovalbumin