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The Journal of Immunology, Vol 138, Issue 12 4133-4142, Copyright © 1987 by American Association of Immunologists
ARTICLES |
S Ozaki and JA Berzofsky
We developed antibody conjugates by covalently coupling antibodies against mouse mu-chain and monoclonal antibodies against nominal antigen, myoglobin, as a tool for antigen presentation and as a model of specific presentation of antigen by antigen-specific B cells and T-B interaction. In the presence of the antibody conjugates, myoglobin- specific Iad-restricted cloned T cells proliferated at 1000-fold lower concentration of myoglobin than the stimulatory concentration without the conjugates. This enhanced presentation was observed only when Iad spleen cells were 1000 R-irradiated but not 3300 R-irradiated, consistent with B cell presentation. The simple mixture of each component of the conjugates had no enhancement effects. The conjugates per se had no mitogenic effects on either splenic B cells or the cloned T cells at concentrations employed for antigen presentation. The conjugates reduced the number of antigen-presenting cells required for the maximal response but did not change the kinetics of response. The enhanced presentation by the conjugates required a genetically restricted interaction with B cells. Antigen specificity of the enhanced presentation was confirmed by using various T cell clones or lines with different antigen specificities and different conjugates constructed with monoclonal antibodies of known epitope specificity. The enhanced presentation was significantly inhibited by competition with exogenous mouse IgM or anti-mouse mu-chain but was not significantly inhibited by monoclonal antibodies against Fc receptor. Thus, conjugate-coated B cells serve as models for myoglobin-specific B cells in that they can take up specific antigens at extremely low concentration and can present the antigen to specific T cells. This model system can be applied to any antigen and any species without the need to develop antigen-specific B cell clones, which is not yet possible for most antigens and species of experimental animals. This system allowed us to investigate the relationship between T cell epitope and B cell epitope when these cells interact with each other in an antigen-specific and Ia-restricted manner. Experiments using antibody conjugates of different monoclonal antibodies against myoglobin and various myoglobin-specific cloned T cells of known antigen specificity revealed that there are some particular combinations in which much more limited enhancement of antigen presentation is observed.(ABSTRACT TRUNCATED AT 400 WORDS)
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