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The Journal of Immunology, 1998, 160: 4869-4880.
Copyright © 1998 by The American Association of Immunologists

Modulation of T Cell Cytokine Profiles and Peptide-MHC Complex Availability In Vivo by Delivery to Scavenger Receptors via Antigen Maleylation1

Nagendra Singh2, Sumeena Bhatia, Roshini Abraham3, Sandip K. Basu, Anna George, Vineeta Bal and Satyajit Rath4

National Institute of Immunology, New Delhi, India

We have previously shown that conversion of proteins to scavenger receptor (SR) ligands by maleylation increases their immunogenicity. We now show that maleyl-Ag-immune spleen cells make relatively more IFN-{gamma} and less IL-4 or IL-10 than native Ag-immune cells. This is also reflected in the IgG1:IgG2a ratios in Abs generated in vivo. SR engagement on macrophages does not alter their surface levels of the adhesive/costimulatory molecules CD11a/CD18, CD11b/CD18, CD24, CD54, or CD40, nor does it enhance their ability to support anti-CD3-driven proliferation of naive T cells in vitro. Costimulatory molecules implicated in differential Th1/Th2 commitment—CD80, CD86, and IL-12—are not inducible by SR ligation. In addition to macrophages and dendritic cells, B cells also show receptor-mediated uptake and enhanced presentation of maleyl-Ags. Using a monoclonal T cell line to detect peptide-MHC complexes expressed on spleen cells in Ag-injected mice, we find that higher levels of these complexes are generated in vivo from maleyl-proteins and they persist longer than those generated from the native protein. Together, these data suggest that in certain situations, the levels of cognate ligand available and/or the time course of their availability may play a major role in determining the cytokine profiles of the responding T cells in addition to the costimulatory signals implicated so far.




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