Antigen recognition by H-2-restricted T cells. II. A tryptic ovalbumin peptide that substitutes for processed antigen.

作者：Richard P. Shimonkevitz, Sonia M. Colon, John W. Kappler, Philippa Marrack, H M Grey · 发表于：The Journal of Immunology · 年份：1984 · DOI：10.4049/jimmunol.133.4.2067 · 被引用次数：347 · 研究领域：T-cell and B-cell Immunology、Immune Cell Function and Interaction、Monoclonal and Polyclonal Antibodies Research

A 17-amino acid tryptic peptide of chicken ovalbumin, designated P323-339, that substituted for processed antigen when presented by glutaraldehyde prefixed accessory cells to specific I-restricted T hybridomas was characterized. The peptide antigen could not be demonstrated to have any specific or stable interactions with accessory cell Ia antigens by either direct binding or functional assays for inhibition of specific T cell activation. In addition, the T cell receptor for I-restricted antigen had no affinity for free antigen alone. A rabbit antibody specific for the antigenic peptide inhibited presentation when introduced before but not after binding of the peptide to accessory cells. These results extend our earlier finding that accessory cell-mediated processing of chicken ovalbumin can be completely explained by the fragmentation of the native molecule into smaller m.w. peptides, and suggests that if an antigen/Ia complex is important in T cell activation, it forms significantly only in the presence of the T cell receptor for I-restricted antigen.