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The Journal of Immunology, Vol 139, Issue 5 1609-1616, Copyright © 1987 by American Association of Immunologists
ARTICLES |
DP Snider and DM Segal
We have targeted protein antigens to antigen-presenting cells in vitro by using antibody heteroaggregates containing an antibody against a protein antigen covalently crosslinked to an antibody against a target structure on the surface of the antigen-presenting cells. Antigen presentation was assessed by measurement of lymphokine released by antigen-specific T cell hybridomas. Depending on the experimental conditions, the crosslinked antibodies decreased the amount of antigen required to give a response by the hybridomas by factors of 10(2) to 10(3). Enhanced presentation occurred when antigen was targeted to MHC class I and class II molecules, surface immunoglobulin, or Fc gamma receptors on the surface of the murine B cell lymphoma-hybridoma, TA3. An enhancement of antigen presentation also occurred when antigen was targeted to surface IgD, or class I and class II MHC molecules on murine splenic B cells, and when antigen was targeted to class I and class II molecules on irradiated adherent spleen cells. No response was seen when antigen was targeted to Fc gamma R on B cells or adherent spleen cells. The ability of each crosslinked antibody to enhance presentation paralleled the total amount of each that bound to the surface of the antigen-presenting cells. Antigen presentation, mediated by crosslinked antibody, was antigen-specific and I-A restricted. The presentation of one antigen by using crosslinked antibody did not result in enhanced presentation of a second, bystander antigen. These results suggest that a novel means of stimulating immune responses may be possible in vivo, by targeting antigen to surface structures on antigen-presenting cells.
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