A novel type of T-T cell interaction removes the requirement for I-B region in the H-2 complex

C. N. Baxevanis, Z. A. Nagy, J. Klein

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

When tested in the in vitro T-cell proliferation assay, H-2a cells are nonresponders to lactate dehydrogenase B (LDH-B; L-lactate:NAD+ oxidoreductase, EC 1.1.1.27) and to IgG2a myeloma protein. However, the cells can be converted into responders either by the addition to the culture of monoclonal anti-Ia.m7 antibody or by the removal from the culture of Lyt-2+ [T-lymphocyte-associated alloantigen (Lyt)-2-positive] lymphocytes. In both instances, the responsiveness can be suppressed again by the addition to the culture of monoclonal antibodies to I region-associated (Ia) molecules controlled by the I-A subregion. These data suggest that, in some H-2 haplotypes, the response to LDH-B and IgG2a is the result of interaction between the I-A and I-E subregions. The H-2a haplotype carries a responder allele at the I-A subregion but the responsiveness of H-2a cells is normally suppressed by T cells recognizing the antigen in the context of the I-E molecules. When the recognition of I-E molecules is blocked by an antiserum or when the cells capable of this recognition are removed, the H-2a cells become responders. These experiments demonstrate a nonresponder turned responder by antibody inhibition. They also demonstrate that the postulate of the I-B subregion is no longer necessary and provide additional evidence that the Ia molecules are the products of the immune response (Ir) genes.

Original languageEnglish (US)
Pages (from-to)3809-3813
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume78
Issue number6 I
DOIs
StatePublished - 1981

All Science Journal Classification (ASJC) codes

  • General

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